Country

Indoor radon concentration (Bq/m3)

Reference

Saudi Arabia

21-34

[36]

Iraq

61.2

[37]

Serbia

20

[38]

Yemen

42

[39]

Brazil

40

[40]

India

15-41

[41]

Poland

32

[42]

Saudi Arabia

6-24

[43]

Korea

34.1

[44]

Study area

15-32

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Table 5: Comparison between our results with international studies.