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首页> 外文期刊>Environmental Monitoring and Assessment >Estimation of various radiological parameters associated with radioactive contents emanating with fly ash from Sahiwal coal-fuelled power plant, Pakistan
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Estimation of various radiological parameters associated with radioactive contents emanating with fly ash from Sahiwal coal-fuelled power plant, Pakistan

机译：巴基斯坦Sahiwal燃煤电厂粉煤灰发出与放射性含量相关的各种放射性参数的估计

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摘要

The release of natural radioactive materials with the emission of fly ash as a result of coal burning in power generation plants is considered amongst the sources that elevate the technologically environmental radioactivity level. This research mainly concerns the assessment of various radiological parameters including excess lifetime cancer risk due to natural radioactive contents associated with fly ash emitted to the surrounding environment from the stack of 1320 Mw Sahiwal coal-fuelled power generation plant (CFPP). For this purpose, fifty-four soil samples were collected in a radius of 4 Km from CFPP and a highly background radiation-shielded HPGe system is used to measure radioactivity in the collected samples. The activity concentrations of radium-226, potassium-40, and thorium-232 in collected samples was found to be in the range of 20 to 138, 43 to 860, and 27 to 127 Bq/kg with average values of 66, 409, and 67 Bq/kg respectively. Activity concentrations of radium-226 and thorium-232 were observed significantly higher than UNSCEAR reported typical global average values. A significant decrease in the level of the aforementioned radionuclides in the collected soil samples was observed with increasing distance from the power plant, which is a clear indication for the elevation of radioactivity concentrations in the surrounding environment as a result of the operation of the CFPP. To assess the radiation dose delivered to the occupational workers and inhabitants living next to Sahiwal CFPP, absorbed gamma-dose rate (D-gamma), outdoor annual effective dose rate (E-Outdoor), and excess lifetime cancer risk (ELCR) were estimated and these were found higher than the UNSCEAR recommended values of 59 nGy/h, 0.07 mSv/y, and 2.9 x 10(-4)respectively. The outcome of this first systematic study is the assessment of potential radiological health risk to the occupational workers as well as the inhabitants living in the proximity of this CFPP.
机译：由于发电厂燃烧的煤炭燃烧的粉煤灰发射的自然放射性材料的释放被认为是在技术环境放射性水平提升技术环境放射性水平的源中。本研究主要涉及各种放射性参数的评估，包括由于与粉煤灰从1320 MW Sahiwal燃煤发电厂（CFPP）发射到周围环境的粉煤灰相关的天然放射性含量，这些放射性导致患有过量的终身癌症风险。为此目的，从CFPP的半径为4公里的半径收集五十四个土样品，并且使用高度背景辐射屏蔽的HPGE系统来测量收集的样品中的放射性。在收集的样品中，镭-226，钾-40和钍-332的活性浓度在20至138,43至860和27至127bq / kg的范围内，平均值为66,409，和67个BQ / kg。观察到镭-226和钍-232的活性浓度明显高于未经检查报告的典型全局平均值。随着从发电厂的距离增加，观察到收集的土壤样品中上述放射性核素水平的显着降低，这是由于CFPP的操作，这是一种清楚地指示周围环境中的放射性浓度的提升。为了评估辐射剂量，向职业工人和居住在Sahiwal CFPP旁边的职业工人和居民，估计吸收γ-剂量率（D-Gamma），室外年度有效剂量率（E-Outdoor）和过量的终身癌症风险（ELCR）并且这些被发现高于未准备的59岁/ h，0.07msV / y和2.9×10（-4）的建议值。这项第一系统研究的结果是评估职业工人的潜在放射健康风险以及生活在此CFPP附近的居民。

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