Sam A K, Abbas N
Sudan Atomic Energy Commission, PO Box 3001, Khartoum, Sudan.
Radiat Prot Dosimetry. 2001;93(3):275-7. doi: 10.1093/oxfordjournals.rpd.a006440.
Activity concentration of 232Th, 226Ra and 40K in local (Atbra and Rabak) and imported cement types (Jordanian, Indonesian and Seabulk) has been measured using high-resolution gamma-spectrometry. The average values obtained for 232Th, 226Ra and 40K activity concentrations in different cements are lower than the corresponding global values reported in UNSCEAR publications. The radium-equivalent activity (Raeq) of the samples was calculated and compared with similar data reported in the literature. The comparison has revealed that Raeq values obtained fall far below the criterion limit specified for building materials. The potential radiological hazard of the different samples was estimated using different approaches: representative level index and annual dose limit (dose due to gamma radiation inside the room and inhalation of radon). The estimated representative level index for all the samples is less than unity (the upper limit) indicating that the associated gamma radiation level is low. The annual dose limit falls within 0.19 to 0.30 mSv, which is an order of magnitude below the criterion limit specified for building materials in the literature.
已使用高分辨率伽马能谱法测量了当地（阿特拉和拉巴克）以及进口水泥类型（约旦、印度尼西亚和西布尔克）中钍-232、镭-226和钾-40的活度浓度。不同水泥中钍-232、镭-226和钾-40活度浓度的平均值低于联合国原子辐射效应科学委员会出版物中报告的相应全球值。计算了样品的镭当量活度（Raeq），并与文献中报告的类似数据进行了比较。比较结果表明，所获得的Raeq值远低于建筑材料规定的标准限值。使用不同方法估算了不同样品的潜在辐射危害：代表性水平指数和年剂量限值（室内伽马辐射剂量和氡吸入剂量）。所有样品的估算代表性水平指数均小于1（上限），表明相关伽马辐射水平较低。年剂量限值在0.19至0.30毫希沃特之间，比文献中建筑材料规定的标准限值低一个数量级。
