A thorough investigation of the uranium concentration in phosphate mines: a case study of Minjingu phosphate mine, Arusha, United Republic of Tanzania

Q4 Medicine

International Journal of Low Radiation Pub Date : 2015-09-19 DOI:10.1504/IJLR.2015.071766

L. Meza, M. Mandour, M. Shalaby, M. H. Hassan, N. Mohamed

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引用次数: 2

Abstract

Using high resolution gamma ray spectrometry, the terrestrial radionuclides from all phosphate rock samples were measured and results are presented. From the measured gamma ray spectra, activity concentrations were determined for 226Ra/238U (range from 122.5±6.9 to 8060±806 Bq kg−1), 232Th (range from 13.2±0.8 to 1201.3±77.3 Bq kg−1), 40K (range from 12.9±1.3 to 1827.6±93.9 Bq kg−1) and 137Cs (range from 0.5±0.017 to 70.58±1.25 Bq kg−1) with mean of 1832.32±00, 447.62±00, 399.46±00 and 22.98±0.43 Bq kg−1 respectively. Radium equivalent activity ranges from 219.27±00 to 9127.07±00 Bq kg−1 with mean of 2433.56±00 Bq kg−1. The total absorbed dose estimated at 1 metre above the ground varies from 102.1 to 3967.8 nGyh−1 with an average of 1055.9 nGy h−1. Investigation of uranium recorded a peak of 650±65ppm, this suggests the existing U concentration is over three times greater than economically viable and production of a cleaner fertiliser is favourable.

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彻底调查磷矿中的铀浓度:对坦桑尼亚联合共和国阿鲁沙Minjingu磷矿的个案研究

用高分辨率伽马能谱法测定了所有磷矿样品中的陆地放射性核素，并给出了结果。根据测量的伽马能谱，测定了226Ra/238U(范围为122.5±6.9至8060±806 Bq kg−1)、232Th(范围为13.2±0.8至1201.3±77.3 Bq kg−1)、40K(范围为12.9±1.3至1827.6±93.9 Bq kg−1)和137Cs(范围为0.5±0.017至70.58±1.25 Bq kg−1)的活度浓度，平均值分别为1832.32±00、447.62±00、399.46±00和22.98±0.43 Bq kg−1。镭当量活度范围为219.27±00至9127.07±00 Bq kg - 1，平均值为2433.56±00 Bq kg - 1。在距地面1米处估计的总吸收剂量在102.1至3967.8毫格/小时- 1之间变化，平均为1055.9毫格/小时- 1。对铀的调查记录了650±65ppm的峰值，这表明现有的铀浓度比经济上可行的浓度高出三倍以上，生产更清洁的肥料是有利的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Low Radiation Environmental Science-Health, Toxicology and Mutagenesis

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期刊介绍： The IJLR is a peer-reviewed journal dedicated to the publication of research articles, review papers and technical notes in all domains related to low-dose radiation, among which are the biological and health effects in humans and the biota, in vitro and in vivo research on low radiation effects, regulatory and policy aspects, risk estimation and public perception.