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首页> 外文期刊>World Journal of Nuclear Science and Technology >Assessment of Exposure Due to Technologically Enhanced Natural Radioactivity in Various Samples of Moroccan Building Materials
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Assessment of Exposure Due to Technologically Enhanced Natural Radioactivity in Various Samples of Moroccan Building Materials

机译：评估摩洛哥建筑材料各种样品中由于技术提高的自然放射性引起的暴露

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The aim of our present work is to measure the specific activities of the radionuclides ~(226)Ra, ~(232)Th, ~(40)K and the exhalation rates in terms of area and mass of ~(222)Rn in some samples of building materials commonly used in Morocco in order to evaluate the radiological risk caused by natural radioactivity. To this end, the analyses were carried out, using two nuclear techniques, namely high resolution gamma spectrometry and alpha dosimetry based on the use of LR115, on 50 samples collected from large commercial suppliers in Morocco. The results of these analyses show that the average specific activities of~( 226)Ra, ~(232)Th and ~(40)K in these materials vary from 9 to 52 Bq/kg, 3 to 63 Bq/kg and 68 to 705 Bq/kg respectively. These activities remain within the permissible limits of 35 Bq/kg, 30 Bq/kg and 370 Bq/kg respectively, with the exception of a few samples of red brick, gray cement, ceramic and granite. The activity of the radium equivalent ( Ra _( eq )), the internal ( H _( in )) and external ( H _( ex )) hazard indices, the absorbed dose rate , the total annual effective dose , the excess lifetime cancer risk (ELCR) as well as volumic activities, exhalation rates in terms of area ( E _( S )) and mass ( E _( M )) are calculated for the samples analyzed in this work in order to assess the radiological risks resulting from the use of these materials in various construction activities. It seems that the values of these indices vary from 19 to 196 Bq/kg, 0.08 to 0.67, 0.05 to 0.53, 9 to 91 nGy/h, 0.05 to 0.56 mSv/y, 0.19 × 10~( − 3) to 1.96 × 10~( − 3), 72 to 350 Bq/m~(3), 56 to 273 mBq ⋅ m~( − 2) ⋅ h~( − 1) and 3 to 15 mBq ⋅ kg~( − 1) ⋅ h~( − 1) respectively. The lowest values are identified for gypsum, while the highest are attributed to granite. All of the obtained results of these indices respect the permissible limits except for the Ra _( eq ) in some granite samples, the ELCR index in all samples except gypsum and the radon volumic activity in some gray cement samples, ceramic and granite. As a result, the different types of building materials analyzed in our work do not present a health risk to the public and can be used in various construction activities, with the exception of a few samples of red brick, gray cement, ceramic and granite. The choice of the use of red brick, gray cement and ceramic should be monitored and adapted according to the criteria of the limitation of the doses whereas the use of the granite must be moderate in order to limit over time the health risk which increases with the duration of exposure of humans to these building materials.
机译：我们当前工作的目的是测量某些区域中放射性核素〜（226）Ra，〜（232）Th，〜（40）K的比活以及呼出率的面积（〜222）Rn摩洛哥常用的建筑材料样品，以评估自然放射性引起的放射风险。为此，对两种从摩洛哥大型商业供应商收集的样品进行了分析，采用了两种核技术，即高分辨率γ光谱法和基于LR115的α剂量法，进行了分析。这些分析的结果表明，这些材料中〜（226）Ra，〜（232）Th和〜（40）K的平均比活度在9至52 Bq / kg，3至63 Bq / kg和68至65 Bq / kg之间变化。分别为705 Bq / kg。这些活动分别保持在35 Bq / kg，30 Bq / kg和370 Bq / kg的允许范围内，除了一些红砖，灰色水泥，陶瓷和花岗岩样品。镭当量（Ra _（eq）），内部（H _（in））和外部（H _（ex））危害指数的活性，吸收剂量率，年总有效剂量，终身过量癌症风险（ELCR）以及大量活动，计算了本工作中分析样品的面积（E _（S））和质量（E _（M））的呼气率，以评估由放射引起的放射风险在各种建筑活动中使用这些材料。这些指数的值似乎从19到196 Bq / kg，0.08到0.67、0.05到0.53、9到91 nGy / h，0.05到0.56 mSv / y，0.19×10〜（-3）到1.96× 10〜（− 3），72至350 Bq / m〜（3），56至273 mBq⋅m〜（− 2）⋅h〜（− 1）和3至15 mBq⋅kg〜（− 1）⋅h 〜（− 1）。确定的最低值是石膏，而最高的是花岗岩。这些指标的所有所得结果均符合某些花岗岩样品中的Ra _（eq）除外的允许限值，除石膏以外的所有样品中的ELCR指标以及某些灰色水泥样品，陶瓷和花岗岩中的ra体积活度。结果，在我们的工作中分析的不同类型的建筑材料不会对公众构成健康风险，并且可以用于各种建筑活动，只有少量红砖，灰色水泥，陶瓷和花岗岩样品除外。应根据剂量限制的标准对红砖，灰水泥和陶瓷的使用选择进行监测和调整，而花岗岩的使用必须适度，以限制随时间增加的健康风险。人类接触这些建筑材料的持续时间。

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