Specific Activity
10© pCi/ug Ra-226
Table 7
Estimated Mean
Range
Area
Reference
Rocks
Sedimentary
Igneous
Soil
0.5 pci/g
2 pCi/g
2
0.5 ~4 pCi/e
2
1 pci/g
2
Lakes and Rivers
3.97 pci/1
1
Drinking
G.04 pci/l
1
Ocean Water
O.07 pci/ix
-
€§—T-
Fresh Water
Ocean Sediments
Human Diet
4
0.02 = 0.3 pCi/1
2
15 pCi/eg
2 poi/d
d,
New York City
6
Body Content
Total
A) pei
3
Skeleton
320 pCi
3
Internal Dose - Osteocytes
Haversian Canalis
*
1.4 mrad/y
0.6 mrad/y
Surface water, deep water is higher.
3
3