El-Bahi S M
Nuclear Physics Laboratory, Faculty of Girls, Ain Shams University, Heliopolis, Cairo, Egypt.
Health Phys. 2004 May;86(5):517-22. doi: 10.1097/00004032-200405000-00008.
The cement industry is considered as one of the basic industries that plays an important role in the national economy of developing countries. Activity concentration of 238U, 232Th, and 40K in local cement types from different Egyptian factories has been measured using a shielded HPGe detector. The average values obtained for 238U, 232Th, and 40K activity concentrations in different types of cement are lower than the corresponding global values reported in UNSCEAR publications. On the basis of the hazard index and the radium equivalent concentration, it can be shown that the natural radioactivity of cement samples is not greater than the values permitted in the established standards in other countries. A solid-state nuclear track detector SSNTD (Cr-39) was used to measure the radon concentration as well as exhalation rate for these samples. The effective radium content and the exhalation rate are found to vary from 12.75 to 38.52 Bq kg(-1) and 61.19 to 181.39 Bq m(-2) d(-1), respectively.
水泥行业被视为对发展中国家国民经济起着重要作用的基础产业之一。已使用屏蔽型高纯锗探测器测量了埃及不同工厂生产的当地水泥类型中238U、232Th和40K的活度浓度。不同类型水泥中238U、232Th和40K活度浓度的平均值低于联合国原子辐射效应科学委员会（UNSCEAR）出版物中报告的相应全球值。根据危害指数和镭当量浓度可知，水泥样品的天然放射性不高于其他国家既定标准中允许的值。使用固态核径迹探测器SSNTD（Cr - 39）测量了这些样品的氡浓度以及析出率。发现有效镭含量和析出率分别在12.75至38.52 Bq kg(-1)和61.19至181.39 Bq m(-2) d(-1)之间变化。
