Determination of natural radioactive elements in Abo Zaabal, Egypt by means of gamma spectroscopy

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• 作者：Zeinab Morsy^a ; Magda Abd El-Wahab^a ; Nabil El-Faramawy^b ; ^{nabil_elfaramawi1@sci.asu.edu.eg}
• 关键词：Natural radioactivity ; Soil ; Risk analysis ; Gamma spectroscopy
• 刊名：Annals of Nuclear Energy
• 出版年：2012
• 期刊代码：1_03064549
• 类别：pw
• 出版时间：June, 2012
• 卷：44
• 期：Complete
• 页码：8-11
• 文件大小：144 K

摘要

The natural nuclide gamma-ray activities and their respective annual effective dose rates, produced by ²³⁸U, ²³²Th, ⁴⁰K and ²²⁶Ra, are determined for 10 different natural samples (soil-plant-water) from Abo Zaabaal Lake. This lake is located very close to the Egyptian reactors. The gamma spectra analysis indicates that the photo-gamma lines represent ten radioactive nuclides ²³⁴Th, ²³⁹Pu, ²²⁸Ac, ²²⁶Ra, ²¹²Pb, ²¹⁴Pb, ²⁰⁸Tl, ²¹²Bi, ²¹⁴Bi and ⁴⁰K. These nuclides represent the daughters of the natural radioactive series ²³⁸U and ²³²Th with ⁴⁰K. The mean activity concentration of ²³⁸U was found to be 6.57, 10.16 and 5.44 Bq kg^鈭? for (soil-plant-water); 8.46, 8.33 and 6.04 Bq kg^鈭? of ²³²Th, and 136.3, 216.8 and 119.2 Bq kg^鈭? of ⁴⁰K respectively. The mean activity concentrations of ²²⁶Ra were obtained which help to evaluate the radiation hazard indices as radium equivalent, internal and external hazard indices. In addition, to assess the radiation risk to a biosystem, the annual effective dose rate, the absorbed dose in human and the absorbed dose outdoor are also evaluated.