Transfer of natural radionuclides from hay and silage to cow鈥檚 milk in the vicinity of a former uranium mine

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• 作者：Marko &Scaron ; trok ^{Marko.Strok@ijs.si} ; Borut Smodi&scaron ; ; ^{Borut.Smodis@ijs.si}
• 关键词：Natural radionuclides ; Milk ; Concentration ratio ; Alpha spectrometry ; Proportional counter
• 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：64-68
• 文件大小：275 K

摘要

After the closure of the former 沤irovski Vrh uranium mine in Slovenia, mining and milling wastes were deposited on two waste piles, which are located close to the mine. These wastes contain elevated levels of natural radionuclides from the uranium decay chain. Due to different migration processes (erosion, aerial deposition, through groundwater), these radionuclides can be transported via fodder into cow鈥檚 milk, which is an important foodstuff for Slovenian people. Therefore, natural radionuclides were analysed in the transfer food chain from soil to cow鈥檚 fodder and cow鈥檚 milk. After sampling, ²³⁸U, ²³⁴U, ²³⁰Th, ²²⁶Ra, ²¹⁰Pb and ²¹⁰Po were determined using radiochemical separation methods and alpha spectrometry or proportional counting. Hay and silage to milk concentration ratios (kg聽dry聽weight聽L^鈭?) were calculated and were 0.260 for ²³⁸U, 0.255 for ²³⁰Th, 0.070 for ²²⁶Ra, 0.021 for ²¹⁰Pb and 0.019 for ²¹⁰Po. The calculated annual ingestion dose due to milk consumption for the natural radionuclides analysed was 9聽渭Sv/year for adults and 389聽渭Sv/year for infants with the highest contribution of ²¹⁰Po (51%for adults and 63%for infants) and ²¹⁰Pb (36%for adults and 24%for infants). This study provides new data quantifying the transfer of natural radionuclides to milk, which is a parameter for which there have been very few previously reported values.