Radiological Hazard Assessment of Raw Granites from Ranyah, KSA  

作　　者：Sadek Zeghib Abdulkadir Sh. Aydarous Ali Al-Qahtany Sadek Zeghib;Abdulkadir Sh. Aydarous;Ali Al-Qahtany(Environmental Protection Laboratory, Physics Department, Faculty of Science, Taif University, Taif, KSA)

机构地区：[1]Environmental Protection Laboratory, Physics Department, Faculty of Science, Taif University, Taif, KSA

出　　处：《Journal of Geoscience and Environment Protection》2016年第9期24-38,共16页地球科学和环境保护期刊（英文）

摘　　要：The assessment of radiological hazard due to external and internal indoor exposure was investigated for 26 raw granites collected from different granite quarries in Ranyah (KSA). The activity concentrations of ²²⁶Ra, ²³²Th and ⁴⁰K were measured by high-resolution gamma spectrometry. Four granites were classified as “anomalous” due to their relatively high radioactivity. The averages and ranges of their activity concentrations were 667 (305 - 1120), 320 (161 - 491) and 586 (282 - 893) Bq·kg^-1, respectively. The corresponding ones for all remaining 22 granites were 45 (18 - 77), 39 (16 - 73) and 1178 (954 - 1531) Bq·kg^-¹, respectively. In accordance with new European Basic Safety Standards (BSS) directives requiring a uniform reference level for indoor external exposure to gamma rays of 1 mSv·y^-¹, all 22 granites may be used as bulk or ornamental building materials without any restrictions. Three anomalous granites should be subjected to control to be used as bulk materials. One anomalous granite was categorized as hazardous having an activity concentration index higher than 6. All four anomalous granites exceeded the level of newly adopted reference level of 300 Bq·m^-³ for radon indoor exposure in case of poor ventilation. Two of them exceeded even for adequate ventilation. ·The assessment of radiological hazard due to external and internal indoor exposure was investigated for 26 raw granites collected from different granite quarries in Ranyah (KSA). The activity concentrations of ²²⁶Ra, ²³²Th and ⁴⁰K were measured by high-resolution gamma spectrometry. Four granites were classified as “anomalous” due to their relatively high radioactivity. The averages and ranges of their activity concentrations were 667 (305 - 1120), 320 (161 - 491) and 586 (282 - 893) Bq·kg^-1, respectively. The corresponding ones for all remaining 22 granites were 45 (18 - 77), 39 (16 - 73) and 1178 (954 - 1531) Bq·kg^-¹, respectively. In accordance with new European Basic Safety Standards (BSS) directives requiring a uniform reference level for indoor external exposure to gamma rays of 1 mSv·y^-¹, all 22 granites may be used as bulk or ornamental building materials without any restrictions. Three anomalous granites should be subjected to control to be used as bulk materials. One anomalous granite was categorized as hazardous having an activity concentration index higher than 6. All four anomalous granites exceeded the level of newly adopted reference level of 300 Bq·m^-³ for radon indoor exposure in case of poor ventilation. Two of them exceeded even for adequate ventilation. ·

关 键 词：Environmental Radioactivity Gamma Spectrometry Activity Concentration RADON GRANITE 

分 类 号：P58[天文地球—岩石学]