Assessment of natural radioactivity levels and the associated radiological hazards in some building materials from Mayo-Kebbi region, Chad

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Table 2

Activity concentrations of ²²⁶Ra, ²³²Th and ⁴⁰K and radium equivalent activity for various building material samples.

Location	Sample	²²⁶Ra	²³²Th	⁴⁰K	Ra_eq
Zabili	Soil bricks	434.88 ± 7.11	50,61 ± 1.51	53.71 ± 2.53	511.40
Madajang-1	Soil bricks	64.43 ± 3.64	19.45 ± 1.53	839.54 ± 8.98	156.88
Madajang-2	Soil bricks	33.50 ± 3.57	21.06 ± 1.62	788.66 ± 9.25	124.34
Léré-1	Gravel	2.70 ± 0.35	1.58 ± 0.78	50.50 ± 2.75	8.85
Léré-2	Gravel	1.62 ± 0.26	1.66 ± 0.72	103.34 ± 3.57	11.96
Léré-3	Sand	1.99 ± 0.36	2.45 ± 0.63	225.88 ± 4.63	22.88
Léré-4	Sand	0.56 ± 0.37	1.66 ± 0.61	207.86 ± 4.61	18.93
Yapala-1	Soil bricks	5.42 ± 1.77	6.82 ± 0.68	219.08 ± 2.93	32.05
Yapala-2	Soil bricks	9.10 ± 2.44	4.01 ± 0.98	229 ± 4.74	32.46
Tagobo-foulbe	Soil bricks	6.98 ± 2.30	7.17 ± 0.98	156.91 ± 3.99	29.31
Binder	Soil bricks	13.53 ± 2.31	17.49 ± 0.94	192.23 ± 4.22	53.35
Pala-1	Gravel	5.55 ± 2.40	1.30 ± 0.60	4.28 ± 1.96	7.74
Pala-2	Sand	9.42 ± 2.77	5.13 ± 0.83	40.39 ± 2.49	19.86
Gamboké-1	Soil bricks	7.49 ± 2.12	4.60 ± 0.89	96.58 ± 3.38	21.50
Gamboké-2	Soil bricks	9.20 ± 3.23	5.91 ± 0.87	74.20 ± 3.12	23.37
Baoré-1	Cement 32.5	3.23 ± 0.50	3.98 ± 0.66	66.65 ± 2.96	14.06
Baoré-2	Cement 42.5	8.47 ± 2.25	7.49 ± 0.99	95.98 ± 3.48	26.49
Bamdi	Soil bricks	22.12 ± 3.70	22.78 ± 1.29	152.45 ± 4.02	66.44
Rong	Soil bricks	12.77 ± 2.32	15.25 ± 0.88	314.34 ± 5.20	58.78

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