Terrestrial Gamma Dose Rates in the United States
with Inferred Sol.
Contents
K
U_.
Th
Total
Dose Rate Range (mrad/y)
1. Populated areas-range (90%)
5 35
10 - 20
15 = 40
30 = 95
Qe
17
13
25
D9
lL - 50
O = 45
5 = 70
15 - 136
"
" typical mean
3. All areas-range (90%)
Inferred Soil Content
1. Range (90%)
(0-4) x 104% ppm
0.5-9 ppm
1.5-30 ppm
2e
1.5 x 104 pom
2e> ppm
9 ppm
le pci/g
0.8 pei/g
1 plei/g
Typical mean
~ 21 -