Country

Activity concentrations in (Bq/L)

References

²²⁶Ra

²³²Th

⁴⁰K

Saudi Arabia (Al-Baha)

0.65

0.16

2.42

Present work

Saudi Arabia (Jeddah)

0.56

0.21

4.58

( Alseroury et al., 2018 )

Jordan

0.131

0.049

0.194

( Al-Shboul et al., 2017 )

Nigeria

4.54

0.50

2.94

( Ajayi & Owolabi, 2007 )

Yemen

3.31

0.94

0.22

( Abdurabu et al., 2016 )

Ghana

0.38

0.54

5.05

( Darko et al., 2015 )

WHOO

1

0.1

10

( WHO, 2006 )