R
Becquerel < > µSv/h
Conversion of Becquerel (activity) into µSv/h (dose rate)
The relationship between Becquerel (activity, i.e. the measure of the decay in the atom) and micro-
sievert per hour (dose rate, i.e. the measure of the radiation at the device):
The values apply to a point source at a distance of 1m from the device
Cs-137 at a distance of 1m with shield open
1 GBq
86 µSv/h
100 µSv/h
1.17 GBq
100 MBq
8.6 µSv/h
10 µSv/h
117 MBq
10 MBq
0.86 µSv/h
1 µSv/h
11.7 MBq
Cs-137 at a distance of 1m with shield closed
1 GBq
81 µSv/h
100 µSv/h
1.24 GBq
100 MBq
8,1 µSv/h
10 µSv/h
124 MBq
10 MBq
0.81 µSv/h
1 µSv/h
12.4 MBq
Co-60 at a distance of 1m with shield open
1 GBq
372 µSv/h
100 µSv/h
0.27 GBq
100 MBq
37.2 µSv/h
10 µSv/h
27 MBq
10 MBq
3.72 µSv/h
1 µSv/h
2,7 MBq
Co-60 at a distance of 1m with shield closed
1 GBq
339 µSv/h
100 µSv/h
0.30 GBq
100 MBq
33.9 µSv/h
10 µSv/h
30 MBq
10 MBq
3.39 µSv/h
1 µSv/h
3.0 MBq
Tc-99m at a distance of 1m with the shield open
1 GBq
13 µSv/h
100 µSv/h
7.96 GBq
100 MBq
1.3 µSv/h
10 µSv/h
796 MBq
10 MBq
0.13 µSv/h
1 µSv/h
79.6 MBq
Tc-99m at a distance of 1m with the shield closed
Measurement not possible, dose rate too low
20
Summary of Contents for ALERT
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