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首页> 外文期刊>Journal of Environmental Science and Technology >Natural Radioactivity Levels and Radiation Hazards for Gypsum Materials Used in Egypt
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Natural Radioactivity Levels and Radiation Hazards for Gypsum Materials Used in Egypt

机译：埃及使用的石膏材料的自然放射性水平和辐射危害

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The gypsum of building materials which are one of the potential sources of indoor radioactivity because of the naturally occurring radionuclides in them. External as well as internal exposures are the two pathways of radiation dose imparted to the human beings from the building materials. Natural radioactivity levels of 18 samples of natural gypsum and manufactured in Egypt have been investigated by using gamma spectrometer with HPGe detector. The samples were collected from local market in Egypt. From the measured γ-ray spectra, activity concentrations were determined. The activity ranged from 10.7±3.4-170.4±5.1 Bq kg-1 for 226Ra, with mean 91.97 Bq kg-1 and from 3.1±0.7-70.8±3.6 Bq kg-1 for 232Th with mean 42.27 Bq kg-1 and from 301.3±6.3-689.1±8.7 Bq kg-1 40K with mean 499.28 Bq kg-1. The radium equivalent activity Raeq, the external hazard index Hex and the absorbed dose rate in air D in each sample was evaluated to assess the radiation hazard for people living in dwelling made of materials studied. Gypsum sample have radium equivalent dose Raeq ranged from 38.41 to 324.7 Bq kg-1. These values are lower than the limit of 370 Bq kg-1 adopted by OECD the Organization for Economic Cooperation and Development. The absorbed dose rate in indoor air are lower than the international recommended values of 55 n Gy h-1 in sample G1, G2, G11, G17and G18. The sample G3, G4, G5, G6, G7, G8, G9, G10, G12, G13, G14, G15 and G16 are higher than of 55 n Gy h-1 this samples are not acceptable for use as building materials as defined by the OECD criterion.
机译：建筑材料的石膏是室内放射性的潜在来源之一，因为其中天然存在放射性核素。外部和内部暴露是建筑材料向人类辐射剂量的两个途径。通过使用带有HPGe探测器的伽马能谱仪研究了埃及生产的18个天然石膏样品的自然放射性水平。样品是从埃及当地市场收集的。从测得的γ射线光谱确定活性浓度。 226 Ra的活度范围为10.7±3.4-170.4±5.1 Bq kg -1 ，平均91.97 Bq kg -1 和3.1 232 Th的±0.7-70.8±3.6 Bq kg -1 为平均42.27 Bq kg -1 和301.3±6.3-689.1±8.7 Bq kg -1 40 K，平均499.28 Bq kg -1 。对每个样品中的镭当量活度Raeq，外部危害指数Hex和空气中D的吸收剂量率进行了评估，以评估居住在由研究材料制成的住宅中的人们的辐射危害。石膏样品的镭当量剂量Ra eq 为38.41至324.7 Bq kg -1 。这些值低于经合组织经济合作与发展组织所规定的370 Bq kg -1 的限值。室内空气中的吸收剂量率低于样品G1，G2，G11，G17和G18中的国际推荐值55 n Gy h -1 。样品G3，G4，G5，G6，G7，G8，G9，G10，G12，G13，G14，G15和G16高于55 n Gy h -1 用作经合组织标准所定义的建筑材料。

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