Howard B J, Mayes R W, Beresford N A, Lamb C S
Institute of Terrestrial Ecology, Merlewood Research Station, Grange-over-Sands, Cumbria, Scotland.
Health Phys. 1989 Oct;57(4):579-86. doi: 10.1097/00004032-198910000-00009.
Indoor experiments are described that compare the transfer of radiocesium to ewe and lamb tissues from different sources. Lactating ewes were fed either perennial ryegrass contaminated by Chernobyl fallout, or saltmarsh vegetation contaminated by marine discharges from the Sellafield reprocessing plant. The transfer to ewe tissues and milk was greater from the Chernobyl contaminated herbage than from saltmarsh vegetation. Lambs receiving a mixture of vegetation and milk were given radiocesium from one of the two vegetation sources or from milk obtained from the experimental ewes. Transfer to lamb tissues declined in the order milk greater than Chernobyl fallout greater than Sellafield discharge. The radiocesium transfer to lamb tissues exceeded that to ewe tissues. Transfer coefficients for 137Cs in the Chernobyl fallout were higher than most previously published figures at 0.12 d kg-1 for ewe muscle and 0.50 d kg-1 for lamb muscle. The transfer coefficient for 137Cs from ewe milk to lamb muscle was 1.20 d kg-1.
本文描述了室内实验，该实验比较了不同来源的放射性铯向母羊和羔羊组织的转移情况。给泌乳母羊喂食受切尔诺贝利事故沉降物污染的多年生黑麦草，或受塞拉菲尔德后处理厂海洋排放物污染的盐沼植被。与盐沼植被相比，受切尔诺贝利污染的牧草向母羊组织和乳汁中的转移量更大。给接受混合了植被和乳汁的羔羊投喂来自两种植被来源之一或实验母羊乳汁中的放射性铯。向羔羊组织的转移量按以下顺序递减：乳汁大于切尔诺贝利事故沉降物大于塞拉菲尔德排放物。放射性铯向羔羊组织的转移量超过了向母羊组织的转移量。切尔诺贝利事故沉降物中137Cs的转移系数高于大多数先前公布的数据，母羊肌肉为0.12 d kg-1，羔羊肌肉为0.50 d kg-1。137Cs从母羊乳汁到羔羊肌肉的转移系数为1.20 d kg-1。
