Meteozone         
Radiation, Air Quality, Weather Monitoring
and Pollutant Source Regions

Description of the Radiation Monitoring System

The USB-RAD121 radiation monitor by Magnii Techologies has been set up to provide real-time background radiation levels. The RAD-121 is located on the north side of the building in a window frame, inside of the screen, but exposed to the outside air. Indoor background levels are normal and therefore only gamma (and perhaps beta) radiation is expected to be detected from outside sources. The RAD-121 unit is monitored through the serial port using a Python program, which saves the count every two minutes and averaged over 10 minutes. Display units are micro-R per hour but the range is 0-50 mR/hr. The long-term radiation data archive can be accessed by entering the end time of the desired six hour segment. Although data collection started 19 February 2007, online access is only available from 1 January 2020.

To put the RAD-121 readings in perspective some units conversion is in order:
1 Sv (Sievert) = 100 R = 0.05 cancer risk (according to ICRP)
1 µSv (micro Sv) = 100 µR (display units)
1 Sv = c µR
2x10-5 Sv = 1x10-6 cancer risk (one in a million)
2000 µR = 1x10-6 cancer risk


Date-Time
Local
Dose (µREM/h)
Current
Dose (µREM/h)
Average
25/02/17 16:0315.614.9
25/02/17 16:0517.815.8
25/02/17 16:0715.615.1
25/02/17 16:0912.215.1
25/02/17 16:1111.114.4
25/02/17 16:1318.915.1
25/02/17 16:1517.815.1
25/02/17 16:1712.214.4
25/02/17 16:198.913.8
25/02/17 16:2118.915.3
25/02/17 16:2316.714.9
25/02/17 16:2514.414.2
25/02/17 16:2711.114.0
25/02/17 16:2918.916.0