Abstract

Twenty Concrete Blocks from (20) different Local Governments in Katsina state was measured using Gamma Ray Spectroscopy with NaI (TL) detector. Three naturally Occurring Radio nuclides and their activity concentrations were determined, are 40K 226Ra, and 232Th.Their activity Concentrations ranges from 40K 46.11 ± 826.59 to 46.11± 8.55 Bq/kg, (226Ra) ranged from10.19 ± 2.43Bq/kg to 75.09 ± 4.98 Bq/kg and (232Th) ranged from 2.77 ± 9.59Bq/kg to 123.49 ± 9.35Bq/kg respectively. The highest value also determined from 40K was (826.59 ± 4.82Bq/kg), the highest value of 226Ra was 75.09 ± 4.98Bq/kg , the highest value for (232Th) is 123.49 ± 9.35 Bq/kg respectively. The Radium Equivalent mean value was obtained from the measurement ranged from (34.8 ± 1.59 to 411.26nGT/h), The absorbed dose rate in air with its mean value was obtained, ranges from (147.16 ±3.55nGy/h). The limit set in the OECD report (370Bq/kg) and UNSCEAR, 2000 (24 to 160nGy/h). The annual effective dose obtained, ranges from 0.04 ± 0.001 to 0.20 ± 0.0001mSv/y, with mean value 0.187 ± 0.0005mSv/y. Recommended limit 0.460 mSv/y setby ICRP, 2007 for terrestrial radiation. The evident that the Results give lower value when compared with 1mSv/y for Public exposure (ICRP, 2007).

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