Radiation averages to know and memorize as an easy guide to your locale

Counts Per Minute CPM

Micro Sieverts per hour uSv/hr

Milli Sieverts Per year

Background Radiation Level Guide for

detections 1 meter above ground

12 0.10 0.88 Average background, pre Fukushima Japan .081 uSv/hr, Australia .17 uSv/hr,

25 0.21 1.83 0.23 uSv/hr world average, USA average 0.34 uSv/hr,

50 0.42 3.65 It is normal to occasionally get short duration peaks above normal background for any location.

60 0.5 4.34 Larger peaks of longer duration indicate detection of a hot spot, or a cloud of radiation is passing through!

100 0.83 7.3 Larger peaks of longer duration indicate detection of a hot spot, or a cloud of radiation is passing through!

150 1.25 10.95 Detections 1.0 uSv/hr and above you are getting into the very dangerous area of detection, shelter or leave immediately!

500 4.17 36.5 Even more dangerous, shelter or leave immediately! Know what your local average background radiation level was