来自喀麦隆西南部高本底辐射地区主食中（226）Ra、（228）Ra 和（40）K 的年摄入量。
Annual intakes of (226)Ra, (228)Ra and (40)K in staple foodstuffs from a high background radiation area in the southwest region of Cameroon.
机构信息
Nuclear Technology Section, Energy Research Laboratory, Institute of geological and Mining Research, Yaoundé, Cameroon.
出版信息
J Environ Radioact. 2012 Aug;110:59-63. doi: 10.1016/j.jenvrad.2012.01.025. Epub 2012 Feb 28.
Concentrations of naturally occurring radionuclides (226)Ra, (228)Ra and (40)K were determined in five most consumed vegetables in a high-level background radiation area (HLBRA) in the southwest region of Cameroon. A total of 25 foodstuff samples collected from Akongo, Ngombas, Awanda, Bikoué and Lolodorf rural districts were analyzed by gamma spectrometry. The average activity concentration values of (226)Ra, (228)Ra and (40)K were respectively 2.30, 1.50 and 140.40 Bq kg(-1) fresh-weights. The effective dose for individual consumption of the investigated foodstuff types was calculated on an estimated annual intake of such diets in the study area. The estimated total daily effective doses from the ingestion of the investigated foodstuffs for each studied long-life natural radionuclide were respectively 0.41 μSv for (226)Ra, 0.84 μSv for (228)Ra and 0.71 μSv for (40)K. The total annual effective dose was estimated at 0.70 mSv y(-1). (228)Ra (44%) and (40)K (36%) were found to be the main sources for internal irradiation which is very likely due to the specific uptake of these radionuclides by the studied plants.
在喀麦隆西南部的一个高水平本底辐射区（HLBRA），测定了五种最常食用蔬菜中的天然放射性核素（226）Ra、（228）Ra 和（40）K 的浓度。共采集了来自 Akongo、Ngombas、Awanda、Bikoué 和 Lolodorf 农村地区的 25 种食品样本，并用伽马谱仪进行了分析。（226）Ra、（228）Ra 和（40）K 的平均活度浓度值分别为 2.30、1.50 和 140.40 Bq kg(-1) 鲜重。根据研究区域内此类饮食的估计年摄入量，计算了个体食用调查食品类型的有效剂量。从摄入研究食品中每种长寿命天然放射性核素的估计总日有效剂量分别为：（226）Ra 为 0.41 μSv，（228）Ra 为 0.84 μSv，（40）K 为 0.71 μSv。估计的年有效剂量为 0.70 mSv y(-1)。（228）Ra（44%）和（40）K（36%）被认为是内部照射的主要来源，这很可能是由于研究植物对这些放射性核素的特殊吸收。
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