Assimakopoulos P A, Divanes K, Pakou A A, Stamoulis K C, Mantzios A S, Nikolaou E
Nuclear Physics Laboratory, University of Ioannina, Greece.
Sci Total Environ. 1995 Nov 3;172(1):17-20. doi: 10.1016/0048-9697(95)04713-1.
Soil ingestion as a source of radiostrontium contamination of ruminant milk products was studied by measuring the transfer coefficient to ovine milk. This is a follow-up report from a previous experiment (Assimakopoulos et al., 1993), which investigated radiocaesium transfer to sheep's milk as a result of soil ingestion. Milk samples from three lactating ewes, housed in individual metabolism cages, were used. Fifty grams per day of heavily contaminated sandy topsoil, collected in the Chernobyl area, were administered orally to the animals for a period of 1 week. The daily intake of 90Sr was 78 Bq day-1. During this contamination period, daily milk production and excreta output were measured. Excreta and milk was collected for an additional 7-day decontamination period, while they were fed on uncontaminated feed. The transfer coefficient was obtained through a best fit (minimum chi 2) of the data to predictions of a linear compartment model. The value obtained was fm = 0.041 +/- 0.016 d kg-1 for radiostrontium transport to milk. This result suggests that soil ingestion can be a major source of radiostrontium contamination in sheep and other free-grazing ruminants.
通过测量向羊奶的转移系数，研究了土壤摄入作为反刍动物奶制品中放射性锶污染来源的情况。这是之前一项实验（Assimakopoulos等人，1993年）的后续报告，该实验研究了土壤摄入导致放射性铯向羊奶的转移。使用了三只圈养在个体代谢笼中的泌乳母羊的奶样。每天给动物口服50克在切尔诺贝利地区采集的重度污染砂质表土，持续1周。90Sr的每日摄入量为78贝克勒尔/天。在这个污染期内，测量了每日产奶量和排泄物量。在动物以未受污染饲料喂养的另外7天净化期内，收集排泄物和奶。转移系数是通过将数据与线性隔室模型的预测进行最佳拟合（最小卡方）得到的。放射性锶向奶的转移得到的值为fm = 0.041 +/- 0.016天·千克-1。这一结果表明，土壤摄入可能是绵羊和其他自由放牧反刍动物中放射性锶污染的主要来源。
