Measurement of Natural Radioactivity and Radon Exhalation Rate in Coal Ash Samples from a Thermal Power Plant  

作　　者：Aziz Boukhair Laila Belahbib Khadija Azkour Hamid Nebdi Mohammed Benjelloun Abdelmjid Nourreddine Aziz Boukhair;Laila Belahbib;Khadija Azkour;Hamid Nebdi;Mohammed Benjelloun;Abdelmjid Nourreddine(Laboratoire de Physique Nucléaire, Atomique et Moléculaire, Département de Physique, Faculté des Sciences Université Chouaib Doukkali, El Jadida, Morocco;Centre Régional des Métiers de l’Education et de la Formation, El Jadida, Morocco;Ministère de l’Intérieur, Secrétariat général, Province d’El Jadida, Morocco;Groupe RaMsEs, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg, Strasbourg, France)

机构地区：[1]Laboratoire de Physique Nucléaire, Atomique et Moléculaire, Département de Physique, Faculté des Sciences Université Chouaib Doukkali, El Jadida, Morocco [2]Centre Régional des Métiers de l’Education et de la Formation, El Jadida, Morocco [3]Ministère de l’Intérieur, Secrétariat général, Province d’El Jadida, Morocco [4]Groupe RaMsEs, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg, Strasbourg, France

出　　处：《World Journal of Nuclear Science and Technology》2016年第3期153-160,共8页核科学与技术国际期刊（英文）

摘　　要：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 ²²⁶Ra activities and ²³²Th in both ash samples are well above the permissible activity. The values of the external risk index (H_ex) and internal one (H_in) for these ashes are below unity, with the exception of 1.28 in fly ash for H_in. The obtained values for the equivalent radium Ra_eq and annual effective doses Ėin 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⋅m^-2⋅h^-1 and 381 mBq⋅m^-2⋅h^-1, 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.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 ²²⁶Ra activities and ²³²Th in both ash samples are well above the permissible activity. The values of the external risk index (H_ex) and internal one (H_in) for these ashes are below unity, with the exception of 1.28 in fly ash for H_in. The obtained values for the equivalent radium Ra_eq and annual effective doses Ėin 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⋅m^-2⋅h^-1 and 381 mBq⋅m^-2⋅h^-1, 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.

关 键 词：Natural Radioactivity Gamma Spectrometry LR115 Fly Ash Bottom Ash Equivalent Radium Annual Effective Doses Exhalation of Radon 

分 类 号：X83[环境科学与工程—环境工程]