Gamma Emitting Radionuclides in Soils from Selected Areas in Douala-Bassa Zone, Littoral Region of Cameroon

Table 2

The radiological health hazard parameters due to the activity contents of ²²⁶Ra, ²³²Th, and ⁴⁰K in soil samples.

Sampling site	Sample ID	Raeq	Absorbed dose	Outdoor annual effective dose	External health hazard index
		(Bq/kg)	(nGy/h)	(mSv/y)	(Hex)
Campus 1	UD01	123.41	99.63	0.12	0.34
	UD02	144.46	115.78	0.14	0.40
	UD03	112.01	90.95	0.11	0.31
	UD04	118.84	96.04	0.12	0.33
	UD05	112.14	90.68	0.11	0.31
	UD06	132.47	106.75	0.13	0.36
	UD07	116.36	94.05	0.12	0.32
Minimum		116.36	90.95	0.11	0.31
Maximum		144.46	115.78	0.14	0.40
Average val. ± DS		122.81±11.90	99.13±9.21	0.12±0.01	0.34±0.03
Campus 2	UD08	100.92	81.92	0.10	0.28
	UD09	118.75	95.87	0.12	0.33
	UD10	129.75	103.88	0.13	0.35
	UD11	114.32	91.50	0.11	0.31
	UD12	116.28	93.23	0.11	0.32
	UD13	133.02	106.53	0.13	0.36
	UD14	120.53	97.99	0.12	0.33
	UD15	141.11	112.96	0.14	0.39
	UD16	129.42	103.89	0.13	0.35
	UD17	130.02	104.19	0.13	0.35
	DU18	108.71	88.07	0.11	0.30
Minimum		100.92	81.92	0.10	0.28
Maximum		141.11	112.96	0.14	0.39
Average val. ± SD		122.08±11.80	98.18±9.11	0.12±0.01	0.33±0.03
Worldwide (UNSCEAR 2000)
Range			18.00–93.00
Average		370.00	60.00	0.07	<1.00