Assessment of environmental ²²⁶Ra, ²³²Th and ⁴⁰K concentrations in the region of elevated radiation background in Segamat District, Johor, Malaysia

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• 作者：Muneer Aziz Saleh ; Ahmad Termizi Ramli ; Yasser Alajerami ; Abubakar Sadiq Aliyu
• 关键词：Environmental ; Soil ; 226Ra ; 232Th ; 40K ; Isodose
• 刊名：Journal of Environmental Radioactivity
• 出版年：2013
• 出版时间：October, 2013
• 年：2013
• 卷：124
• 期：Complete
• 页码：130-140
• 全文大小：3290 K

文摘

Extensive environmental survey and measurements of gamma radioactivity in the soil samples collected from Segamat District were conducted. Two gamma detectors were used for the measurements of background radiation in the area and the results were used in the computation of the mean external radiation dose rate and mean weighted dose rate, which are 276?nGy?h^?1 and 1.169?mSv?y^?1, respectively. A high purity germanium (HPGe) detector was used in the assessment of activity concentrations of ²³²Th, ²²⁶Ra and ⁴⁰K. The results of the gamma spectrometry range from 11?¡À?1 to 1210?¡À?41?Bq?kg^?1 for ²³²Th, 12?¡À?1 to 968?¡À?27?Bq?kg^?1 for ²²⁶Ra, and 12?¡À?2 to 2450?¡À?86?Bq?kg^?1 for ⁴⁰K. Gross alpha and gross beta activity concentrations range from 170?¡À?50 to 4360?¡À?170?Bq?kg^?1 and 70?¡À?20 to 4690?¡À?90?Bq?kg^?1, respectively. These results were used in the plotting of digital maps (using ARCGIS 9.3) for isodose. The results are compared with values giving in .