Abstract:
T
wenty Concrete Blocks from (20) different Local Governments in Katsina state was
measured using Gamma Ray Spectroscopy with NaI (TL) detector. Three naturally Occurring
Radionuclides and their activity concentrations were determined, are
40
K
226
Ra, and
232
Th.
Their activity Concentrations ranges from
40
K 46.11 ± 826.59 to
46.11
± 8.55 Bq/kg, (
226
Ra)
ranged from10.19 ± 2.43Bq/kg to 75.09 ± 4.98 Bq/kg and (
232
Th) ranged from 2.77 ±
9.59Bq/kg to
123.49
±
9.35
Bq/kg respectively. The highest value also determined from
40
K
was (826.59 ± 4.82Bq/kg), the highest value of
226
Ra was 75.09 ± 4.98Bq/kg , the highest
value for (
232
Th) is
123.49
±
9.35
Bq/kg respectively. The Radium Equivalent mean value
was obtained fr
om 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 effect
ive 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 set
by ICRP, 2007 for terrestrial radiation. The evident that the Results give lower value when
compared with 1mSv/y for
Public exposure (ICRP, 2007).
