Assessment of natural radioactivity and associated radiation hazards in sand building material used in Douala Littoral Region of Cameroon, using gamma spectrometry
Assessment of natural radioactivity and associated radiation hazards in sand building material used in Douala Littoral Region of Cameroon, using gamma spectrometry
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使用伽马能谱法评估喀麦隆杜阿拉沿海地区使用的砂建筑材料的天然放射性和相关辐射危害
DOI：
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发表时间：
2017
影响因子：
2.8
通讯作者：
D. Strivay
中科院分区：
文献类型：
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作者：
Cebastien Joel Guembou Shouop;Maurice Ndontchueng Moyo;G. Chéné;Eric Jilbert Nguelem Mekontso;O. Motapon;Steve Kayo;D. Strivay
从杜阿拉沿岸的地区（Wouri、Dibamba、Mungo和Docteur Anse河以及大西洋）沿着几内亚高尔夫球场的不同采石场采集了24个砂样。这些样品进行了研究，使用伽玛射线能谱系统。226 Ra、232 Th和40 K测量的比活度的最高值（以Bq Kg−1为单位）分别为146.7（在Youpoue-Bouna 2）102.9（1号）和928（在北方阿夸6），而最低值分别为11.8（北方阿夸6）、8.0（博纳贝里-博纳米卡诺4）和54.0（尤普埃3）。通过连续计算镭当量活度（Raeq）、室外吸收γ剂量率（Dout）、年有效剂量率、内部危害指数（Hin）和外部危害指数（Hex）以及使用这些沙子建造住宅和大型建筑物的α和γ指数，评估潜在放射性危害参数。所获得的结果表明，杜阿拉居民因建筑用沙而吸收的年剂量低于1.0 mSv/年。因此，大多数类型的沙子研究和纳入建设似乎是安全的建筑材料。这项研究的结果将有助于评估沙子建筑材料对人体的辐射危害，并启动一个沙子数据库以及一个有关地区的放射性地图。
Twenty-four sand samples were collected from different sand quarries from Douala Littoral Region (Wouri, Dibamba, Mungo and Docteur Anse rivers and Atlantic Sea) along the Guinea Golf. These samples were investigated using gamma-ray spectrometry system. Highest values of 226Ra, 232Th and 40K measured specific activities expressed in Bq Kg−1 units were, respectively, 146.7 (in Youpoue–Bamenda 2) 102.9 (in Village 1) and 928 (in Northern Akwa 6) while the lowest values were found to be, respectively, 11.8 (in Northern Akwa 6), 8.0 (in Bonaberi–Bonamikano 4) and 54.0 (Youpoue 3). The potential radiological hazards parameters were assessed by calculating successively radium equivalent activity (Raeq), outdoor absorbed gamma dose rate (Dout), annual effective dose rate, internal hazard (Hin) and external hazard (Hex) indices and alpha and gamma index from using those sand in the construction of dwellings and large buildings. Results obtained show that annual dose absorbed by inhabitants due to sand construction use in Douala is below 1.0 mSv year−1. Therefore, most of the types of sands studied and incorporated in constructions appear to be safe as building material. The outputs from this research will be useful to assess the radiation hazards of sand building material in humans and to initiate a sand database together with a radiological map of the area at stake.