Location

average concentration Bq/Kg

Total average annual effective dose (╬╝Sv/y)

Reference

238U

226Ra

232Th

40K

137Cs

238U

226Ra

232Th

40K

Hong Kong

0.018

0.005

0.47

86.65

o.11

0.018

0.083

2.585

--

[29]

Oman

0.49

--

0.40

134.0

0.33

--

--

--

--

[30]

Nigeria

--

1.860

1.65

58.00

--

--

--

--

--

[31]

Kainji lake

--

37.22

94.82

384.98

--

--

29.802

28.77

9.73

[32]

Brazil

0.05

0.19

0.06

--

--

--

--

--

--

[33]

Saudi Arabia Jeddah

1.63

1.60

1.66

208.13

0.96

Present Work