Country
|
Type
of Radioactive Isotope
|
|||
K-40
|
U-238
|
Ra-226
|
Th-232
|
|
India
|
400
|
29
|
29
|
64
|
China
|
440
|
33
|
32
|
41
|
Japan
|
310
|
29
|
33
|
28
|
USA
|
370
|
35
|
40
|
35
|
Russia
|
520
|
19
|
27
|
30
|
Spain
|
470
|
NA
|
32
|
33
|
Mean values are given from wide range of values
Courtesy: UNSCEAR, 2000