Belli M, Blasi M, Capra E, Drigo A, Menegon S, Piasentier E, Sansone U
ENEA-DISP, Rome, Italy.
Sci Total Environ. 1993 Aug 31;136(3):243-9. doi: 10.1016/0048-9697(93)90312-t.
Ingestion of soil has been identified as a potentially important source of radionuclides, particularly to grazing ruminants. Soil artificially contaminated with radiocaesium was administered orally each day for 33 days to Bergamasca sheep and the transfer to milk measured. Two soil types were used, with a clay content of 11% and 16%, respectively. Transfer coefficient (fm) values to sheep milk, calculated at the equilibrium (period from 7th to 21st day after soil administration), were 3.72 x 10(-4) days l-1 (S.D. = 7.2 x 10(-5) days l-1) and 6.11 x 10(-4) days l-1 (S.D. = 9.1 x 10(-5) days l-1), respectively for the two soils. These low values indicate that radiocaesium is not removed from the binding sites on the clay minerals in the gut of the sheep.
摄入土壤已被确定为放射性核素的一个潜在重要来源，对放牧反刍动物而言尤其如此。每天给贝加马斯卡羊口服人工被放射性铯污染的土壤，持续33天，并测定其向牛奶中的转移情况。使用了两种土壤类型，黏土含量分别为11%和16%。在平衡期（土壤投喂后第7天至第21天）计算得出的两种土壤向羊奶中的转移系数（fm）值分别为3.72×10⁻⁴天⁻¹（标准差 = 7.2×10⁻⁵天⁻¹）和6.11×10⁻⁴天⁻¹（标准差 = 9.1×10⁻⁵天⁻¹）。这些低值表明放射性铯未从羊肠道内黏土矿物的结合位点上移除。
