Country

Activity concentration (Bq∙kg⁻¹)

Ra_eq (Bq∙kg⁻¹)

Reference

^226Ra

^232Th

^40K

Kenya, Kargi

7

8

355

46

Present work

Iraq, Destroyed fuel facility

16

14

306

60

Abdulla et al., 2016

India, Tamilnadu

116

44

300

201

Raghu et al., 2017

Nigeria, Port Harcourt

5

4

16

11

Avwiri et al., 2013

Kenya, Sakwa Wagusu

44

40

640

141

Aguko et al., 2013

Turkey, Kirklareli

37

40

667

-

Taskin et al., 2009

World average

37

33

400

370

UNSCEAR, 2008; Lu & Zhang, 2006