Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10686825 | Journal of Environmental Radioactivity | 2005 | 7 Pages |
Abstract
Thirty-two samples of concrete building blocks were collected from different block making industries in Ibadan. The radioactivity concentrations of the natural radionuclides in the samples were determined by gamma-ray spectrometry with a NaI(Tl) detector. The radioactivity concentrations varied from 6.2 to 57.5 Bq kgâ1, 12.4 to 64.9 Bq kgâ1 and 95.3 to 766.1 Bq kgâ1 for 226Ra, 232Th and 40K, respectively. The radium equivalent activities of the 32 samples varied from 51.3 to 175.7 Bq kgâ1. Radiation exposure levels in 30 dwellings were determined using LiF thermoluminescent dosimeters. The annual equivalent dose rates varied from 0.318 to 0.657 mSv yâ1 with a mean of 0.433 mSv yâ1. The annual effective dose rate to the whole body was calculated as 0.236 mSv yâ1, which is less than that (mean) estimated by UNSCEAR for normal background areas.
Related Topics
Physical Sciences and Engineering
Energy
Nuclear Energy and Engineering
Authors
J.A. Ademola, P.O. Oguneletu,