Estimation of Ra-224 Content in Egyptian Black Sand by the Can- and Alpha-Autoradiography Techniques using LR-115 Plastic Detectors
作者:
A. F. Hafez,
M. A. Kotb,
期刊:
Isotopenpraxis Isotopes in Environmental and Health Studies
(Taylor Available online 1991)
卷期:
Volume 27,
issue 4
页码: 195-199
ISSN:0021-1915
年代: 1991
DOI:10.1080/10256019108622507
出版商: Taylor & Francis Group
关键词: alpha particles;autoradiography;black sands;dielectric track detectors;egyptian arab republic;exhalation;particle tracks;quantity ratio;radioactivity;radium 224
数据来源: Taylor
摘要:
Sealed can- and alpha-autoradiography techniques were used to estimate the effective and real contents of Ra-224 respectively in Egyptian black sand samples collected from Rosetta City in the Nile Delta at the North Coast of Egypt. The effective Ra-224 content was found to be 15 ± 3 Bq · kg−1. From the average chemical composition of the black sand samples, the range-energy relation for the alpha-particles of the thorium series was calculated. Assuming radioactive equilibrium, the real Ra-224 content for samples collected from different regions were found to range from 90 to 900 Bq · kg−1. As a result, the total emanation power was measured and then used to estimate grain diameter of the black sand. The average mass exhalation rate of the different locations in Rosetta City was also estimated.
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