Table 2.
Radon Exhalation Rates of Soils from Various References

Material	Radon exhalationper unit area (Bq·m-2·h-1)	Radon exhalationper unit weight (Bq·kg·h-1)	Countriesorigin	Reference
Soil	-	0.0777	U.S.A. (CA,MD)	(Ingersoll, 1983)
Soil	57.6	-	World average	(UNSCEAR, 1969)
Soil	0.375±0.147	-	Pakistan(Punjab)	(Faheem and Matiullah, 2008)
Soil	72-7560	-	Syria	(Shweikani and Hushari, 2005)
Soil	0.246-1.100	-	India	(Singh et al., 2005)
Soil	-	0.0391-0.0912	India	(Bala et al., 2017)
Soil	0.003-0.145	-	Morocco	(Oufni, 2003)
Soil	0.4368-2.7913	0.00219-0.01403	Nepal	(Parajuli et al., 2015)
Soil	161.28-174.96	-	South Korea	(Seo et al., 2018)
Hwangtoh	1.421-3.029	0.040-0.085	South Korea	Present study