Annual intakes of ²²⁶Ra, ²²⁸Ra and ⁴⁰K in staple foodstuffs from a high background radiation area in the southwest region of Cameroon

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• 作者：P. Ele Abiama^a ; ^c ; ^{eleabiama2003@yahoo.fr} ; G.H. Ben-Bolie^c ; N. Amechmachi^b ; F. Najib^b ; T. El Khoukhi^b ; P. Owono Ateba^c
• 关键词：Ingestion dose ; Southwest region of Cameroon ; Foodstuffs ; 226Ra ; 228Ra ; 40K
• 刊名：Journal of Environmental Radioactivity
• 出版年：2012
• 期刊代码：45_0265931x
• 类别：env
• 出版时间：August, 2012
• 卷：110
• 期：Complete
• 页码：59-63
• 文件大小：523 K

摘要

Concentrations of naturally occurring radionuclides ²²⁶Ra, ²²⁸Ra and ⁴⁰K 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, Bikou茅 and Lolodorf rural districts were analyzed by gamma spectrometry. The average activity concentration values of ²²⁶Ra, ²²⁸Ra and ⁴⁰K were respectively 2.30, 1.50 and 140.40聽Bq聽kg^鈭? 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聽渭Sv for ²²⁶Ra, 0.84聽渭Sv for ²²⁸Ra and 0.71聽渭Sv for ⁴⁰K. The total annual effective dose was estimated at 0.70聽mSv聽y^鈭?. ²²⁸Ra (44%) and ⁴⁰K (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.