diff --git a/coordinator/iocontrol.lua b/coordinator/iocontrol.lua
index f44becb..9a788db 100644
--- a/coordinator/iocontrol.lua
+++ b/coordinator/iocontrol.lua
@@ -132,7 +132,9 @@ function iocontrol.init(conf, comms, temp_scale, energy_scale)
         sps_data_tbl = {},       ---@type sps_session_db[]
 
         tank_ps_tbl = {},        ---@type psil[]
-        tank_data_tbl = {}       ---@type dynamicv_session_db[]
+        tank_data_tbl = {},      ---@type dynamicv_session_db[]
+
+        rad_monitors = {}        ---@type { radiation: radiation_reading, raw: number }[]
     }
 
     -- create induction and SPS tables (currently only 1 of each is supported)
@@ -242,7 +244,9 @@ function iocontrol.init(conf, comms, temp_scale, energy_scale)
             turbine_data_tbl = {},  ---@type turbinev_session_db[]
 
             tank_ps_tbl = {},       ---@type psil[]
-            tank_data_tbl = {}      ---@type dynamicv_session_db[]
+            tank_data_tbl = {},     ---@type dynamicv_session_db[]
+
+            rad_monitors = {}       ---@type { radiation: radiation_reading, raw: number }[]
         }
 
         -- on other facility modes, overwrite unit TANK option with facility tank defs
@@ -797,7 +801,9 @@ function iocontrol.update_facility_status(status)
             if type(rtu_statuses.envds) == "table" then
                 local max_rad, max_reading, any_conn, any_faulted = 0, types.new_zero_radiation_reading(), false, false
 
-                for _, envd in pairs(rtu_statuses.envds) do
+                fac.rad_monitors = {}
+
+                for id, envd in pairs(rtu_statuses.envds) do
                     local rtu_faulted = envd[1] ---@type boolean
                     local radiation   = envd[2] ---@type radiation_reading
                     local rad_raw     = envd[3] ---@type number
@@ -809,6 +815,10 @@ function iocontrol.update_facility_status(status)
                         max_rad = rad_raw
                         max_reading = radiation
                     end
+
+                    if not rtu_faulted then
+                        fac.rad_monitors[id] = { radiation = radiation, raw = rad_raw }
+                    end
                 end
 
                 if any_conn then
@@ -1099,9 +1109,12 @@ function iocontrol.update_unit_statuses(statuses)
                     if type(rtu_statuses.envds) == "table" then
                         local max_rad, max_reading, any_conn = 0, types.new_zero_radiation_reading(), false
 
-                        for _, envd in pairs(rtu_statuses.envds) do
-                            local radiation = envd[2] ---@type radiation_reading
-                            local rad_raw   = envd[3] ---@type number
+                        unit.rad_monitors = {}
+
+                        for id, envd in pairs(rtu_statuses.envds) do
+                            local rtu_faulted = envd[1] ---@type boolean
+                            local radiation   = envd[2] ---@type radiation_reading
+                            local rad_raw     = envd[3] ---@type number
 
                             any_conn = true
 
@@ -1109,6 +1122,10 @@ function iocontrol.update_unit_statuses(statuses)
                                 max_rad = rad_raw
                                 max_reading = radiation
                             end
+
+                            if not rtu_faulted then
+                                unit.rad_monitors[id] = { radiation = radiation, raw = rad_raw }
+                            end
                         end
 
                         if any_conn then
diff --git a/coordinator/session/pocket.lua b/coordinator/session/pocket.lua
index a12870a..7c2a72a 100644
--- a/coordinator/session/pocket.lua
+++ b/coordinator/session/pocket.lua
@@ -427,6 +427,13 @@ function pocket.new_session(id, s_addr, i_seq_num, in_queue, out_queue, timeout)
                 }
 
                 _send(CRDN_TYPE.API_GET_WASTE, data)
+            elseif pkt.type == CRDN_TYPE.API_GET_RAD then
+                local data = {}
+
+                for i = 1, #db.units do data[i] = db.units[i].rad_monitors end
+                data[#db.units + 1] = db.facility.rad_monitors
+
+                _send(CRDN_TYPE.API_GET_RAD, data)
             else
                 log.debug(log_tag .. "handler received unsupported CRDN packet type " .. pkt.type)
             end
diff --git a/coordinator/startup.lua b/coordinator/startup.lua
index cd1213c..1edf082 100644
--- a/coordinator/startup.lua
+++ b/coordinator/startup.lua
@@ -19,7 +19,7 @@ local renderer    = require("coordinator.renderer")
 local sounder     = require("coordinator.sounder")
 local threads     = require("coordinator.threads")
 
-local COORDINATOR_VERSION = "v1.6.15"
+local COORDINATOR_VERSION = "v1.6.16"
 
 local CHUNK_LOAD_DELAY_S = 30.0
 
diff --git a/pocket/iocontrol.lua b/pocket/iocontrol.lua
index 5378329..fe2955c 100644
--- a/pocket/iocontrol.lua
+++ b/pocket/iocontrol.lua
@@ -98,7 +98,8 @@ function iocontrol.init_core(pkt_comms, nav, cfg)
         get_unit = function (unit) comms.api__get_unit(unit) end,
         get_ctrl = function () comms.api__get_control() end,
         get_proc = function () comms.api__get_process() end,
-        get_waste = function () comms.api__get_waste() end
+        get_waste = function () comms.api__get_waste() end,
+        get_rad = function () comms.api__get_rad() end
     }
 end
 
@@ -184,7 +185,9 @@ function iocontrol.init_fac(conf)
         sps_data_tbl = {},       ---@type sps_session_db[]
 
         tank_ps_tbl = {},        ---@type psil[]
-        tank_data_tbl = {}       ---@type dynamicv_session_db[]
+        tank_data_tbl = {},      ---@type dynamicv_session_db[]
+
+        rad_monitors = {}        ---@type { radiation: radiation_reading, raw: number }[]
     }
 
     -- create induction and SPS tables (currently only 1 of each is supported)
@@ -264,7 +267,9 @@ function iocontrol.init_fac(conf)
             turbine_data_tbl = {},  ---@type turbinev_session_db[]
 
             tank_ps_tbl = {},       ---@type psil[]
-            tank_data_tbl = {}      ---@type dynamicv_session_db[]
+            tank_data_tbl = {},     ---@type dynamicv_session_db[]
+
+            rad_monitors = {}       ---@type { radiation: radiation_reading, raw: number }[]
         }
 
         -- on other facility modes, overwrite unit TANK option with facility tank defs
diff --git a/pocket/iorx.lua b/pocket/iorx.lua
index cdb5d91..aea9699 100644
--- a/pocket/iorx.lua
+++ b/pocket/iorx.lua
@@ -658,7 +658,6 @@ function iorx.record_waste_data(data)
     fac.ps.publish("sps_process_rate", f_data[9])
 end
 
-
 -- update facility app with facility and unit data from API_GET_FAC_DTL
 ---@param data table
 function iorx.record_fac_detail_data(data)
@@ -819,6 +818,59 @@ function iorx.record_fac_detail_data(data)
     s_ps.publish("SPSStateStatus", s_stat)
 end
 
+-- update the radiation monitor app with radiation monitor data from API_GET_RAD
+---@param data table
+function iorx.record_radiation_data(data)
+    -- unit radiation monitors
+
+    for u_id = 1, #io.units do
+        local unit      = io.units[u_id]
+        local max_rad   = 0
+        local connected = {}
+
+        unit.radiation = types.new_zero_radiation_reading()
+        unit.rad_monitors = data[u_id]
+
+        for id, mon in pairs(unit.rad_monitors) do
+            table.insert(connected, id)
+
+            unit.unit_ps.publish("radiation@" .. id, mon.radiation)
+
+            if mon.raw > max_rad then
+                max_rad = mon.raw
+                unit.radiation = mon.radiation
+            end
+        end
+
+        unit.unit_ps.publish("radiation", unit.radiation)
+        unit.unit_ps.publish("radiation_monitors", textutils.serialize(connected))
+    end
+
+    -- facility radiation monitors
+
+    local fac = io.facility
+
+    fac.radiation = types.new_zero_radiation_reading()
+    fac.rad_monitors = data[#io.units + 1]
+
+    local max_rad = 0
+    local connected = {}
+
+    for id, mon in pairs(fac.rad_monitors) do
+        table.insert(connected, id)
+
+        fac.ps.publish("radiation@" .. id, mon.radiation)
+
+        if mon.raw > max_rad then
+            max_rad = mon.raw
+            fac.radiation = mon.radiation
+        end
+    end
+
+    fac.ps.publish("radiation", fac.radiation)
+    fac.ps.publish("radiation_monitors", textutils.serialize(connected))
+end
+
 return function (io_obj)
     io = io_obj
     return iorx
diff --git a/pocket/pocket.lua b/pocket/pocket.lua
index 55cc829..cfa435a 100644
--- a/pocket/pocket.lua
+++ b/pocket/pocket.lua
@@ -96,11 +96,12 @@ local APP_ID = {
     WASTE = 7,
     GUIDE = 8,
     ABOUT = 9,
+    RADMON = 10,
     -- diagnostic app pages
-    ALARMS = 10,
+    ALARMS = 11,
     -- other
-    DUMMY = 11,
-    NUM_APPS = 11
+    DUMMY = 12,
+    NUM_APPS = 12
 }
 
 pocket.APP_ID = APP_ID
@@ -369,8 +370,7 @@ function pocket.init_nav(smem)
         self.help_return = self.cur_app
 
         nav.open_app(APP_ID.GUIDE, function ()
-            local show = self.help_map[key]
-            if show then show() end
+            if self.help_map[key] then self.help_map[key]() end
         end)
     end
 
@@ -583,6 +583,11 @@ function pocket.comms(version, nic, sv_watchdog, api_watchdog, nav)
         if self.api.linked then _send_api(CRDN_TYPE.API_GET_WASTE, {}) end
     end
 
+    -- coordinator get radiation app data
+    function public.api__get_rad()
+        if self.api.linked then _send_api(CRDN_TYPE.API_GET_RAD, {}) end
+    end
+
     -- send a facility command
     ---@param cmd FAC_COMMAND command
     ---@param option any? optional option options for the optional options (like waste mode)
@@ -759,6 +764,10 @@ function pocket.comms(version, nic, sv_watchdog, api_watchdog, nav)
                             if _check_length(packet, #iocontrol.get_db().units + 1) then
                                 iocontrol.rx.record_waste_data(packet.data)
                             end
+                        elseif packet.type == CRDN_TYPE.API_GET_RAD then
+                            if _check_length(packet, #iocontrol.get_db().units + 1) then
+                                iocontrol.rx.record_radiation_data(packet.data)
+                            end
                         else _fail_type(packet) end
                     else
                         log.debug("discarding coordinator SCADA_CRDN packet before linked")
diff --git a/pocket/startup.lua b/pocket/startup.lua
index 71e2a73..b2f7874 100644
--- a/pocket/startup.lua
+++ b/pocket/startup.lua
@@ -22,7 +22,7 @@ local pocket    = require("pocket.pocket")
 local renderer  = require("pocket.renderer")
 local threads   = require("pocket.threads")
 
-local POCKET_VERSION = "v0.13.4-beta"
+local POCKET_VERSION = "v0.13.5-beta"
 
 local println = util.println
 local println_ts = util.println_ts
diff --git a/pocket/ui/apps/radiation.lua b/pocket/ui/apps/radiation.lua
new file mode 100644
index 0000000..e40cb6d
--- /dev/null
+++ b/pocket/ui/apps/radiation.lua
@@ -0,0 +1,219 @@
+--
+-- Radiation Monitor App
+--
+
+local util         = require("scada-common.util")
+
+local iocontrol    = require("pocket.iocontrol")
+local pocket       = require("pocket.pocket")
+
+local style        = require("pocket.ui.style")
+
+local core         = require("graphics.core")
+
+local Div          = require("graphics.elements.Div")
+local ListBox      = require("graphics.elements.ListBox")
+local MultiPane    = require("graphics.elements.MultiPane")
+local Rectangle    = require("graphics.elements.Rectangle")
+local TextBox      = require("graphics.elements.TextBox")
+
+local WaitingAnim  = require("graphics.elements.animations.Waiting")
+
+local RadIndicator = require("graphics.elements.indicators.RadIndicator")
+
+local ALIGN  = core.ALIGN
+local cpair  = core.cpair
+local border = core.border
+
+local APP_ID = pocket.APP_ID
+
+local label_fg_bg = style.label
+local lu_col      = style.label_unit_pair
+
+-- new radiation monitor page view
+---@param root Container parent
+local function new_view(root)
+    local db = iocontrol.get_db()
+
+    local frame = Div{parent=root,x=1,y=1}
+
+    local app = db.nav.register_app(APP_ID.RADMON, frame, nil, false, true)
+
+    local load_div = Div{parent=frame,x=1,y=1}
+    local main = Div{parent=frame,x=1,y=1}
+
+    TextBox{parent=load_div,y=12,text="Loading...",alignment=ALIGN.CENTER}
+    WaitingAnim{parent=load_div,x=math.floor(main.get_width()/2)-1,y=8,fg_bg=cpair(colors.yellow,colors._INHERIT)}
+
+    local load_pane = MultiPane{parent=main,x=1,y=1,panes={load_div,main}}
+
+    app.set_sidebar({ { label = " # ", tall = true, color = core.cpair(colors.black, colors.green), callback = db.nav.go_home } })
+
+    local page_div = nil ---@type Div|nil
+
+    -- load the app (create the elements)
+    local function load()
+        local f_ps = db.facility.ps
+
+        page_div = Div{parent=main,y=2,width=main.get_width()}
+
+        local panes = {} ---@type Div[]
+
+        -- create all page divs
+        for _ = 1, db.facility.num_units + 2 do
+            local div = Div{parent=page_div}
+            table.insert(panes, div)
+        end
+
+        local last_update = 0
+        -- refresh data callback, every 500ms it will re-send the query
+        local function update()
+            if util.time_ms() - last_update >= 500 then
+                db.api.get_rad()
+                last_update = util.time_ms()
+            end
+        end
+
+        -- create a new radiation monitor list
+        ---@param parent Container
+        ---@param ps psil
+        local function new_mon_list(parent, ps)
+            local mon_list = ListBox{parent=parent,y=6,scroll_height=100,nav_fg_bg=cpair(colors.lightGray,colors.gray),nav_active=cpair(colors.white,colors.gray)}
+
+            local elem_list = {}    ---@type graphics_element[]
+
+            mon_list.register(ps, "radiation_monitors", function (data)
+                local ids = textutils.unserialize(data)
+
+                -- delete any disconnected monitors
+                for id, elem in pairs(elem_list) do
+                    if not util.table_contains(ids, id) then
+                        elem.delete()
+                        elem_list[id] = nil
+                    end
+                end
+
+                -- add newly connected monitors
+                for _, id in pairs(ids) do
+                    if not elem_list[id] then
+                        elem_list[id] = Div{parent=mon_list,height=5}
+                        local mon_rect = Rectangle{parent=elem_list[id],height=4,x=2,width=20,border=border(1,colors.gray,true),thin=true,fg_bg=cpair(colors.black,colors.lightGray)}
+
+                        TextBox{parent=mon_rect,text="Env. Detector "..id}
+                        local mon_rad = RadIndicator{parent=mon_rect,x=2,label="",format="%13.3f",lu_colors=cpair(colors.gray,colors.gray),width=18}
+                        mon_rad.register(ps, "radiation@" .. id, mon_rad.update)
+                    end
+                end
+            end)
+        end
+
+        --#region unit radiation monitors
+
+        for i = 1, db.facility.num_units do
+            local u_pane = panes[i]
+            local u_div = Div{parent=u_pane}
+            local unit = db.units[i]
+            local u_ps = unit.unit_ps
+
+            local u_page = app.new_page(nil, i)
+            u_page.tasks = { update }
+
+            TextBox{parent=u_div,y=1,text="Unit #"..i.." Monitors",alignment=ALIGN.CENTER}
+
+            TextBox{parent=u_div,x=2,y=3,text="Max Radiation",fg_bg=label_fg_bg}
+            local radiation = RadIndicator{parent=u_div,x=2,label="",format="%17.3f",lu_colors=lu_col,width=21}
+            radiation.register(u_ps, "radiation", radiation.update)
+
+            new_mon_list(u_div, u_ps)
+        end
+
+        --#endregion
+
+        --#region overview page
+
+        local s_pane = panes[db.facility.num_units + 1]
+        local s_div = Div{parent=s_pane,x=2,width=main.get_width()-2}
+
+        local stat_page = app.new_page(nil, db.facility.num_units + 1)
+        stat_page.tasks = { update }
+
+        TextBox{parent=s_div,y=1,text=" Radiation Monitoring",alignment=ALIGN.CENTER}
+
+        TextBox{parent=s_div,y=3,text="Max Facility Rad.",fg_bg=label_fg_bg}
+        local s_f_rad = RadIndicator{parent=s_div,label="",format="%17.3f",lu_colors=lu_col,width=21}
+        s_f_rad.register(f_ps, "radiation", s_f_rad.update)
+
+        for i = 1, db.facility.num_units do
+            local unit = db.units[i]
+            local u_ps = unit.unit_ps
+
+            s_div.line_break()
+            TextBox{parent=s_div,text="Max Unit "..i.." Radiation",fg_bg=label_fg_bg}
+            local s_u_rad = RadIndicator{parent=s_div,label="",format="%17.3f",lu_colors=lu_col,width=21}
+            s_u_rad.register(u_ps, "radiation", s_u_rad.update)
+        end
+
+        --#endregion
+
+        --#region overview page
+
+        local f_pane = panes[db.facility.num_units + 2]
+        local f_div = Div{parent=f_pane,width=main.get_width()}
+
+        local fac_page = app.new_page(nil, db.facility.num_units + 2)
+        fac_page.tasks = { update }
+
+        TextBox{parent=f_div,y=1,text="Facility Monitors",alignment=ALIGN.CENTER}
+
+        TextBox{parent=f_div,x=2,y=3,text="Max Radiation",fg_bg=label_fg_bg}
+        local f_rad = RadIndicator{parent=f_div,x=2,label="",format="%17.3f",lu_colors=lu_col,width=21}
+        f_rad.register(f_ps, "radiation", f_rad.update)
+
+        new_mon_list(f_div, f_ps)
+
+        --#endregion
+
+        -- setup multipane
+        local u_pane = MultiPane{parent=page_div,x=1,y=1,panes=panes}
+        app.set_root_pane(u_pane)
+
+        -- setup sidebar
+
+        local list = {
+            { label = " # ", tall = true, color = core.cpair(colors.black, colors.green), callback = db.nav.go_home },
+            { label = " \x1e ", color = core.cpair(colors.black, colors.blue), callback = stat_page.nav_to },
+            { label = "FAC", color = core.cpair(colors.black, colors.yellow), callback = fac_page.nav_to }
+        }
+
+        for i = 1, db.facility.num_units do
+            table.insert(list, { label = "U-" .. i, color = core.cpair(colors.black, colors.lightGray), callback = function () app.switcher(i) end })
+        end
+
+        app.set_sidebar(list)
+
+        -- done, show the app
+        stat_page.nav_to()
+        load_pane.set_value(2)
+    end
+
+    -- delete the elements and switch back to the loading screen
+    local function unload()
+        if page_div then
+            page_div.delete()
+            page_div = nil
+        end
+
+        app.set_sidebar({ { label = " # ", tall = true, color = core.cpair(colors.black, colors.green), callback = db.nav.go_home } })
+        app.delete_pages()
+
+        -- show loading screen
+        load_pane.set_value(1)
+    end
+
+    app.set_load(load)
+    app.set_unload(unload)
+
+    return main
+end
+
+return new_view
diff --git a/pocket/ui/main.lua b/pocket/ui/main.lua
index 588cf0b..e033777 100644
--- a/pocket/ui/main.lua
+++ b/pocket/ui/main.lua
@@ -14,6 +14,7 @@ local facil_app   = require("pocket.ui.apps.facility")
 local guide_app   = require("pocket.ui.apps.guide")
 local loader_app  = require("pocket.ui.apps.loader")
 local process_app = require("pocket.ui.apps.process")
+local rad_app     = require("pocket.ui.apps.radiation")
 local sys_apps    = require("pocket.ui.apps.sys_apps")
 local unit_app    = require("pocket.ui.apps.unit")
 local waste_app   = require("pocket.ui.apps.waste")
@@ -71,6 +72,7 @@ local function init(main)
     process_app(page_div)
     waste_app(page_div)
     guide_app(page_div)
+    rad_app(page_div)
     loader_app(page_div)
     sys_apps(page_div)
     diag_apps(page_div)
diff --git a/pocket/ui/pages/home_page.lua b/pocket/ui/pages/home_page.lua
index ada6e92..80fdd3f 100644
--- a/pocket/ui/pages/home_page.lua
+++ b/pocket/ui/pages/home_page.lua
@@ -29,8 +29,9 @@ local function new_view(root)
 
     local apps_1 = Div{parent=main,x=1,y=1,height=15}
     local apps_2 = Div{parent=main,x=1,y=1,height=15}
+    local apps_3 = Div{parent=main,x=1,y=1,height=15}
 
-    local panes = { apps_1, apps_2 }
+    local panes = { apps_1, apps_2, apps_3 }
 
     local app_pane = AppMultiPane{parent=main,x=1,y=1,height=18,panes=panes,active_color=colors.lightGray,nav_colors=cpair(colors.lightGray,colors.gray),scroll_nav=true,drag_nav=true,callback=app.switcher}
 
@@ -50,15 +51,17 @@ local function new_view(root)
     App{parent=apps_1,x=16,y=2,text="\x15",title="Control",callback=function()open(APP_ID.CONTROL)end,app_fg_bg=cpair(colors.black,colors.green),active_fg_bg=active_fg_bg}
     App{parent=apps_1,x=2,y=7,text="\x17",title="Process",callback=function()open(APP_ID.PROCESS)end,app_fg_bg=cpair(colors.black,colors.purple),active_fg_bg=active_fg_bg}
     App{parent=apps_1,x=9,y=7,text="\x7f",title="Waste",callback=function()open(APP_ID.WASTE)end,app_fg_bg=cpair(colors.black,colors.brown),active_fg_bg=active_fg_bg}
-    App{parent=apps_1,x=16,y=7,text="\x08",title="Devices",callback=function()open(APP_ID.DUMMY)end,app_fg_bg=cpair(colors.black,colors.lightGray),active_fg_bg=active_fg_bg}
-    App{parent=apps_1,x=2,y=12,text="\xb6",title="Guide",callback=function()open(APP_ID.GUIDE)end,app_fg_bg=cpair(colors.black,colors.cyan),active_fg_bg=active_fg_bg}
-    App{parent=apps_1,x=9,y=12,text="?",title="About",callback=function()open(APP_ID.ABOUT)end,app_fg_bg=cpair(colors.black,colors.white),active_fg_bg=active_fg_bg}
+    App{parent=apps_1,x=16,y=7,text="\xb6",title="Guide",callback=function()open(APP_ID.GUIDE)end,app_fg_bg=cpair(colors.black,colors.cyan),active_fg_bg=active_fg_bg}
+    App{parent=apps_1,x=2,y=12,text="?",title="About",callback=function()open(APP_ID.ABOUT)end,app_fg_bg=cpair(colors.black,colors.white),active_fg_bg=active_fg_bg}
 
-    TextBox{parent=apps_2,text="Diagnostic Apps",x=1,y=2,alignment=ALIGN.CENTER}
+    App{parent=apps_2,x=2,y=2,text="\x08",title="Devices",callback=function()open(APP_ID.DUMMY)end,app_fg_bg=cpair(colors.black,colors.lightGray),active_fg_bg=active_fg_bg}
+    App{parent=apps_2,x=9,y=2,text="\x1e",title="Rad",callback=function()open(APP_ID.RADMON)end,app_fg_bg=cpair(colors.black,colors.yellow),active_fg_bg=active_fg_bg}
 
-    App{parent=apps_2,x=2,y=4,text="\x0f",title="Alarm",callback=function()open(APP_ID.ALARMS)end,app_fg_bg=cpair(colors.black,colors.red),active_fg_bg=active_fg_bg}
-    App{parent=apps_2,x=9,y=4,text="\x1e",title="LoopT",callback=function()open(APP_ID.DUMMY)end,app_fg_bg=cpair(colors.black,colors.cyan),active_fg_bg=active_fg_bg}
-    App{parent=apps_2,x=16,y=4,text="@",title="Comps",callback=function()open(APP_ID.DUMMY)end,app_fg_bg=cpair(colors.black,colors.orange),active_fg_bg=active_fg_bg}
+    TextBox{parent=apps_3,text="Diagnostic Apps",x=1,y=2,alignment=ALIGN.CENTER}
+
+    App{parent=apps_3,x=2,y=4,text="\x0f",title="Alarm",callback=function()open(APP_ID.ALARMS)end,app_fg_bg=cpair(colors.black,colors.yellow),active_fg_bg=active_fg_bg}
+    App{parent=apps_3,x=9,y=4,text="@",title="Comps",callback=function()open(APP_ID.DUMMY)end,app_fg_bg=cpair(colors.black,colors.orange),active_fg_bg=active_fg_bg}
+    App{parent=apps_3,x=16,y=4,text="R",title="RS Test",callback=function()open(APP_ID.DUMMY)end,app_fg_bg=cpair(colors.black,colors.red),active_fg_bg=active_fg_bg}
 
     return main
 end
diff --git a/reactor-plc/config/system.lua b/reactor-plc/config/system.lua
index 909dda7..8d37809 100644
--- a/reactor-plc/config/system.lua
+++ b/reactor-plc/config/system.lua
@@ -82,8 +82,9 @@ function system.create(tool_ctl, main_pane, cfg_sys, divs, style, exit)
     local plc_c_2 = Div{parent=plc_cfg,x=2,y=4,width=49}
     local plc_c_3 = Div{parent=plc_cfg,x=2,y=4,width=49}
     local plc_c_4 = Div{parent=plc_cfg,x=2,y=4,width=49}
+    local plc_c_5 = Div{parent=plc_cfg,x=2,y=4,width=49}
 
-    local plc_pane = MultiPane{parent=plc_cfg,x=1,y=4,panes={plc_c_1,plc_c_2,plc_c_3,plc_c_4}}
+    local plc_pane = MultiPane{parent=plc_cfg,x=1,y=4,panes={plc_c_1,plc_c_2,plc_c_3,plc_c_4,plc_c_5}}
 
     TextBox{parent=plc_cfg,x=1,y=2,text=" PLC Configuration",fg_bg=cpair(colors.black,colors.orange)}
 
@@ -152,13 +153,21 @@ function system.create(tool_ctl, main_pane, cfg_sys, divs, style, exit)
 
     function self.bundled_emcool(en) if en then color.enable() else color.disable() end end
 
+    TextBox{parent=plc_c_5,x=1,y=1,height=5,text="Advanced Options"}
+    local invert = Checkbox{parent=plc_c_5,x=1,y=3,label="Invert",default=ini_cfg.EmerCoolInvert,box_fg_bg=cpair(colors.orange,colors.black),callback=function()end}
+    TextBox{parent=plc_c_5,x=10,y=3,text="new!",fg_bg=cpair(colors.red,colors._INHERIT)}  ---@todo remove NEW tag on next revision
+    TextBox{parent=plc_c_5,x=3,y=4,height=4,text="Digital I/O is already inverted (or not) based on intended use. If you have a non-standard setup, you can use this option to avoid needing a redstone inverter.",fg_bg=cpair(colors.gray,colors.lightGray)}
+    PushButton{parent=plc_c_5,x=1,y=14,text="\x1b Back",callback=function()plc_pane.set_value(4)end,fg_bg=nav_fg_bg,active_fg_bg=btn_act_fg_bg}
+
     local function submit_emcool()
         tmp_cfg.EmerCoolSide = side_options_map[side.get_value()]
         tmp_cfg.EmerCoolColor = util.trinary(bundled.get_value(), color_options_map[color.get_value()], nil)
+        tmp_cfg.EmerCoolInvert = invert.get_value()
         next_from_plc()
     end
 
     PushButton{parent=plc_c_4,x=1,y=14,text="\x1b Back",callback=function()plc_pane.set_value(3)end,fg_bg=nav_fg_bg,active_fg_bg=btn_act_fg_bg}
+    PushButton{parent=plc_c_4,x=33,y=14,min_width=10,text="Advanced",callback=function()plc_pane.set_value(5)end,fg_bg=cpair(colors.black,colors.yellow),active_fg_bg=btn_act_fg_bg,dis_fg_bg=btn_dis_fg_bg}
     PushButton{parent=plc_c_4,x=44,y=14,text="Next \x1a",callback=submit_emcool,fg_bg=nav_fg_bg,active_fg_bg=btn_act_fg_bg}
 
     --#endregion
@@ -461,6 +470,7 @@ function system.create(tool_ctl, main_pane, cfg_sys, divs, style, exit)
             try_set(side, side_to_idx(ini_cfg.EmerCoolSide))
             try_set(bundled, ini_cfg.EmerCoolColor ~= nil)
             if ini_cfg.EmerCoolColor ~= nil then try_set(color, color_to_idx(ini_cfg.EmerCoolColor)) end
+            try_set(invert, ini_cfg.EmerCoolInvert)
             try_set(svr_chan, ini_cfg.SVR_Channel)
             try_set(plc_chan, ini_cfg.PLC_Channel)
             try_set(timeout, ini_cfg.ConnTimeout)
@@ -533,9 +543,11 @@ function system.create(tool_ctl, main_pane, cfg_sys, divs, style, exit)
         if tmp_cfg.EmerCoolEnable then
             tmp_cfg.EmerCoolSide = config.EMERGENCY_COOL.side
             tmp_cfg.EmerCoolColor = config.EMERGENCY_COOL.color
+            tmp_cfg.EmerCoolInvert = false
         else
             tmp_cfg.EmerCoolSide = nil
             tmp_cfg.EmerCoolColor = nil
+            tmp_cfg.EmerCoolInvert = false
         end
 
         tmp_cfg.SVR_Channel = config.SVR_CHANNEL
diff --git a/reactor-plc/configure.lua b/reactor-plc/configure.lua
index b2baa6d..fbc25c1 100644
--- a/reactor-plc/configure.lua
+++ b/reactor-plc/configure.lua
@@ -32,7 +32,8 @@ local changes = {
     { "v1.6.2", { "AuthKey minimum length is now 8 (if set)" } },
     { "v1.6.8", { "ConnTimeout can now have a fractional part" } },
     { "v1.6.15", { "Added front panel UI theme", "Added color accessibility modes" } },
-    { "v1.7.3", { "Added standard with black off state color mode", "Added blue indicator color modes" } }
+    { "v1.7.3", { "Added standard with black off state color mode", "Added blue indicator color modes" } },
+    { "v1.8.21", { "Added option to invert emergency coolant redstone control" } }
 }
 
 ---@class plc_configurator
@@ -76,6 +77,7 @@ local tmp_cfg = {
     EmerCoolEnable = false,
     EmerCoolSide = nil,     ---@type string|nil
     EmerCoolColor = nil,    ---@type color|nil
+    EmerCoolInvert = false, ---@type boolean
     SVR_Channel = nil,      ---@type integer
     PLC_Channel = nil,      ---@type integer
     ConnTimeout = nil,      ---@type number
@@ -100,6 +102,7 @@ local fields = {
     { "EmerCoolEnable", "Emergency Coolant", false },
     { "EmerCoolSide", "Emergency Coolant Side", nil },
     { "EmerCoolColor", "Emergency Coolant Color", nil },
+    { "EmerCoolInvert", "Emergency Coolant Invert", false },
     { "SVR_Channel", "SVR Channel", 16240 },
     { "PLC_Channel", "PLC Channel", 16241 },
     { "ConnTimeout", "Connection Timeout", 5 },
diff --git a/reactor-plc/plc.lua b/reactor-plc/plc.lua
index 73b95ce..a2929cb 100644
--- a/reactor-plc/plc.lua
+++ b/reactor-plc/plc.lua
@@ -43,6 +43,7 @@ function plc.load_config()
     config.EmerCoolEnable = settings.get("EmerCoolEnable")
     config.EmerCoolSide = settings.get("EmerCoolSide")
     config.EmerCoolColor = settings.get("EmerCoolColor")
+    config.EmerCoolInvert = settings.get("EmerCoolInvert")
 
     config.SVR_Channel = settings.get("SVR_Channel")
     config.PLC_Channel = settings.get("PLC_Channel")
@@ -98,6 +99,7 @@ function plc.validate_config(cfg)
     if cfg.EmerCoolEnable then
         cfv.assert_eq(rsio.is_valid_side(cfg.EmerCoolSide), true)
         cfv.assert_eq(cfg.EmerCoolColor == nil or rsio.is_color(cfg.EmerCoolColor), true)
+        cfv.assert_type_bool(cfg.EmerCoolInvert)
     end
 
     return cfv.valid()
@@ -166,7 +168,8 @@ function plc.rps_init(reactor, is_formed)
     local function _set_emer_cool(state)
         -- check if this was configured: if it's a table, fields have already been validated.
         if config.EmerCoolEnable then
-            local level = rsio.digital_write_active(rsio.IO.U_EMER_COOL, state)
+            -- use ~= as XOR for simple inversion
+            local level = rsio.digital_write_active(rsio.IO.U_EMER_COOL, config.EmerCoolInvert ~= state)
 
             if level ~= false then
                 if rsio.is_color(config.EmerCoolColor) then
diff --git a/reactor-plc/startup.lua b/reactor-plc/startup.lua
index c085e95..ddf289a 100644
--- a/reactor-plc/startup.lua
+++ b/reactor-plc/startup.lua
@@ -18,7 +18,7 @@ local plc       = require("reactor-plc.plc")
 local renderer  = require("reactor-plc.renderer")
 local threads   = require("reactor-plc.threads")
 
-local R_PLC_VERSION = "v1.8.20"
+local R_PLC_VERSION = "v1.8.22"
 
 local println = util.println
 local println_ts = util.println_ts
diff --git a/rtu/config/check.lua b/rtu/config/check.lua
index bc3f6d5..fbc7c4c 100644
--- a/rtu/config/check.lua
+++ b/rtu/config/check.lua
@@ -195,7 +195,7 @@ local function self_check()
                 valid = is_int_min_max(entry.unit, 1, 4)
             elseif p_type == "dynamicValve" then
                 valid = (entry.unit == nil and is_int_min_max(entry.index, 1, 4)) or is_int_min_max(entry.unit, 1, 4)
-            elseif p_type == "environmentDetector" then
+            elseif p_type == "environmentDetector" or p_type == "environment_detector"  then
                 valid = (entry.unit == nil or is_int_min_max(entry.unit, 1, 4)) and util.is_int(entry.index)
             else
                 valid = true
diff --git a/rtu/config/peripherals.lua b/rtu/config/peripherals.lua
index e214379..cbb3a06 100644
--- a/rtu/config/peripherals.lua
+++ b/rtu/config/peripherals.lua
@@ -43,8 +43,8 @@ local self = {
 
 local peripherals = {}
 
-local RTU_DEV_TYPES = { "boilerValve", "turbineValve", "dynamicValve", "inductionPort", "spsPort", "solarNeutronActivator", "environmentDetector" }
-local NEEDS_UNIT = { "boilerValve", "turbineValve", "dynamicValve", "solarNeutronActivator", "environmentDetector" }
+local RTU_DEV_TYPES = { "boilerValve", "turbineValve", "dynamicValve", "inductionPort", "spsPort", "solarNeutronActivator", "environmentDetector", "environment_detector" }
+local NEEDS_UNIT = { "boilerValve", "turbineValve", "dynamicValve", "solarNeutronActivator", "environmentDetector", "environment_detector" }
 
 -- create the peripherals configuration view
 ---@param tool_ctl _rtu_cfg_tool_ctl
@@ -165,7 +165,7 @@ function peripherals.create(tool_ctl, main_pane, cfg_sys, peri_cfg, style)
             end
 
             self.p_desc.set_value("Each reactor unit can have at most 1 tank and the facility can have at most 4. Each facility tank must have a unique # 1 through 4, regardless of where it is connected. Only a total of 4 tanks can be displayed on the flow monitor.")
-        elseif type == "environmentDetector" then
+        elseif type == "environmentDetector" or type == "environment_detector" then
             reposition("This is the below system's #     env. detector.", 29, 99, 17, 6, 8)
             self.p_assign_btn.show()
             self.p_assign_btn.redraw()
@@ -281,7 +281,7 @@ function peripherals.create(tool_ctl, main_pane, cfg_sys, peri_cfg, style)
         local idx = tonumber(self.p_idx.get_value())
 
         if util.table_contains(NEEDS_UNIT, peri_type) then
-            if (peri_type == "dynamicValve" or peri_type == "environmentDetector") and for_facility then
+            if (peri_type == "dynamicValve" or peri_type == "environmentDetector" or peri_type == "environment_detector") and for_facility then
                 -- skip
             elseif not (util.is_int(u) and u > 0 and u < 5) then
                 self.p_err.set_value("Unit ID must be within 1 to 4.")
@@ -310,7 +310,7 @@ function peripherals.create(tool_ctl, main_pane, cfg_sys, peri_cfg, style)
             else index = idx end
         elseif peri_type == "dynamicValve" then
             index = 1
-        elseif peri_type == "environmentDetector" then
+        elseif peri_type == "environmentDetector" or peri_type == "environment_detector" then
             if not (util.is_int(idx) and idx > 0) then
                 self.p_err.set_value("Index must be greater than 0.")
                 self.p_err.show()
diff --git a/rtu/config/system.lua b/rtu/config/system.lua
index d29b1ec..27beef7 100644
--- a/rtu/config/system.lua
+++ b/rtu/config/system.lua
@@ -506,7 +506,7 @@ function system.create(tool_ctl, main_pane, cfg_sys, divs, ext, style)
                 local u, idx = def.unit, def.index
 
                 if util.table_contains(NEEDS_UNIT, mount.type) then
-                    if (mount.type == "dynamicValve" or mount.type == "environmentDetector") and for_facility then
+                    if (mount.type == "dynamicValve" or mount.type == "environmentDetector" or mount.type == "environment_detector") and for_facility then
                         -- skip
                     elseif not (util.is_int(u) and u > 0 and u < 5) then
                         err = true
@@ -527,7 +527,7 @@ function system.create(tool_ctl, main_pane, cfg_sys, divs, ext, style)
                     else index = idx end
                 elseif mount.type == "dynamicValve" then
                     index = 1
-                elseif mount.type == "environmentDetector" then
+                elseif mount.type == "environmentDetector" or mount.type == "environment_detector" then
                     if not (util.is_int(idx) and idx > 0) then
                         err = true
                     else index = idx end
diff --git a/rtu/startup.lua b/rtu/startup.lua
index d3812c6..d7cfe97 100644
--- a/rtu/startup.lua
+++ b/rtu/startup.lua
@@ -31,7 +31,7 @@ local sna_rtu      = require("rtu.dev.sna_rtu")
 local sps_rtu      = require("rtu.dev.sps_rtu")
 local turbinev_rtu = require("rtu.dev.turbinev_rtu")
 
-local RTU_VERSION = "v1.12.1"
+local RTU_VERSION = "v1.12.2"
 
 local RTU_UNIT_TYPE = types.RTU_UNIT_TYPE
 local RTU_HW_STATE = databus.RTU_HW_STATE
@@ -472,7 +472,7 @@ local function main()
 
                 rtu_type = RTU_UNIT_TYPE.SNA
                 rtu_iface, faulted = sna_rtu.new(device)
-            elseif type == "environmentDetector" then
+            elseif type == "environmentDetector" or type == "environment_detector" then
                 -- advanced peripherals environment detector
                 if not validate_index(1) then return false end
                 if not validate_assign(entry.unit == nil) then return false end
diff --git a/rtu/threads.lua b/rtu/threads.lua
index e036a4e..ac875aa 100644
--- a/rtu/threads.lua
+++ b/rtu/threads.lua
@@ -89,7 +89,7 @@ local function handle_unit_mount(smem, println_ts, iface, type, device, unit)
                 if unit.reactor < 1 or unit.reactor > 4 then fail(util.c("SNA '", unit.name, "' cannot init, not assigned to a valid unit")) end
 
                 unit.type = RTU_UNIT_TYPE.SNA
-            elseif type == "environmentDetector" then
+            elseif type == "environmentDetector" or type == "environment_detector"  then
                 -- advanced peripherals environment detector
                 if unit.reactor < 0 or unit.reactor > 4 then fail(util.c("environment detector '", unit.name, "' cannot init, no valid assignment provided")) end
                 if (unit.index == false) or unit.index < 1 then fail(util.c("environment detector '", unit.name, "' cannot init, invalid index provided")) end
diff --git a/scada-common/comms.lua b/scada-common/comms.lua
index f827ab8..2f3ef71 100644
--- a/scada-common/comms.lua
+++ b/scada-common/comms.lua
@@ -17,8 +17,8 @@ local max_distance = nil
 local comms = {}
 
 -- protocol/data versions (protocol/data independent changes tracked by util.lua version)
-comms.version = "3.0.6"
-comms.api_version = "0.0.9"
+comms.version = "3.0.7"
+comms.api_version = "0.0.10"
 
 ---@enum PROTOCOL
 local PROTOCOL = {
@@ -72,7 +72,8 @@ local CRDN_TYPE = {
     API_GET_UNIT = 10,   -- API: get reactor unit data
     API_GET_CTRL = 11,   -- API: get data for the control app
     API_GET_PROC = 12,   -- API: get data for the process app
-    API_GET_WASTE = 13   -- API: get data for the waste app
+    API_GET_WASTE = 13,  -- API: get data for the waste app
+    API_GET_RAD = 14     -- API: get data for the radiation monitor app
 }
 
 ---@enum ESTABLISH_ACK