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Measurement of Natural Radioactivity and Radon Exhalation Rate in Coal Ash Samples from a Thermal Power Plant 被引量:1
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作者 Aziz Boukhair laila belahbib +3 位作者 Khadija Azkour Hamid Nebdi Mohammed Benjelloun Abdelmjid Nourreddine 《World Journal of Nuclear Science and Technology》 2016年第3期153-160,共8页
Coal is the main energy source for electricity generation in the world. In Morocco, 37% of electricity generation comes from combustion coal in thermal power plants. This combustion process generates large amounts of ... Coal is the main energy source for electricity generation in the world. In Morocco, 37% of electricity generation comes from combustion coal in thermal power plants. This combustion process generates large amounts of fly and bottom ashes. In recent years, these ashes became a great topic of interest because of their different uses and especially in construction materials. In this work, we assess radiation risks due to natural radioactivity in samples of fly and bottom ashes collected from JLEC (Jorf Lasfar Energy Company) thermal power plant, and different analyses are performed through two nuclear techniques such as gamma spectrometry and alpha dosimetry based on the use of LR115 films detectors. Our analysis shows that <sup>226</sup>Ra activities and <sup>232</sup>Th in both ash samples are well above the permissible activity. The values of the external risk index (H<sub>ex</sub>) and internal one (H<sub>in</sub>) for these ashes are below unity, with the exception of 1.28 in fly ash for H<sub>in</sub>. The obtained values for the equivalent radium Ra<sub>eq</sub> and annual effective doses &#278;in fly and bottom ashes are 324 Bq/kg and 210 Bq/kg, and 0.18 mSv/y and 0.11 mSv/y, respectively. The surface radon exhalation rates for the samples of fly and bottom ashes are 276 mBq&sdot;m<sup>-2</sup>&sdot;h<sup>-1</sup> and 381 mBq&sdot;m<sup>-2</sup>&sdot;h<sup>-1</sup>, respectively. Based on these results, we have shown that fly ash and bottom one from thermal power plant JLEC didn’t have, in any case, a health risk to the public so it can be effectively used in various construction activities. 展开更多
关键词 Natural Radioactivity Gamma Spectrometry LR115 Fly Ash Bottom Ash Equivalent Radium Annual Effective Doses Exhalation of Radon
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Assessment of the Radiological Impact on the Environment near a Storage Site of Coal Ashes in a Thermal Power Plant
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作者 Aziz Boukhair laila belahbib +3 位作者 Khadija Azkour Hamid Nebdi Mohammed Benjelloun Abdelmjid Nourreddine 《World Journal of Nuclear Science and Technology》 2016年第4期206-216,共11页
The radiological impact of coal ashes, with enhanced natural radioactivity in the storage site, is due to the presence of naturally occurring radionuclides. Some of these radionuclides have a radioactive period of sev... The radiological impact of coal ashes, with enhanced natural radioactivity in the storage site, is due to the presence of naturally occurring radionuclides. Some of these radionuclides have a radioactive period of several million years and will, therefore, have time to migrate to the soil, atmospheric air, surface water, and groundwater. This impact depends mainly on the activity of these coal ashes, the duration of exposure to such waste, transfers to the air, and the leaching phenomenon by rainwater. In this study, and so as to assess the radiological impact of coal ashes of the storage site of the JLEC-Morocco thermal power plant on environment, some analyses are performed by alpha dosimetry and a digital dosimeter on samples of coal ashes, soil, atmospheric air, surface water and groundwater belonging to a perimeter of 10 km around that site. The obtained results show that, within the studied area, the radiological impact on the soil of the coal ashes of the storage site is insignificant even though the concentrations of radon in the near vicinity (1 to 2 km) are moderately important, and remain below 200 Bq/m3. In the atmospheric air, this impact remains medium for the neighborhoods of the storage site (2 to 3 km) with radon activities superior to 10 Bq/m3. These results also show that there may be a water contamination of wells located at the storage site without any transfer of radioactivity into the groundwater of the area studied where the concentrations of radon are less than 11.1 Bq/l. 展开更多
关键词 Storage Site Coal Ashes Environment Radiological Impact Soil Water Atmospheric Air LR115 RADON Volumetric Activity Exhalation of Radon
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