Aspects of the uptake of radionuclides by sheep grazing on an estuarine saltmarsh. 2. Radionuclides in sheep tissues

The transfer 137Cs, 238Pu, 239/240Pu and 241Am to sheep which graze a saltmarsh in the Esk estuary, 7 km south of the sellafield reprocessing plant in west Cumbria (UK), has been estimated. The concentrations of gamma-emitting radionuclides and of 238Pu, 239/240Pu and 241Am were measured in liver, lung, muscle, kidney and bone from saltmarsh ewes and lambs. 137Cs concentrations in the soft tissues were similar in liver, lung and muscle but were consistently higher in kidney and much lower in bone. The highest concentration of the transuranics was found in liver. Transfer coefficients and concentration factors were calculated for both ewes and lambs. The concentration of 137Cs in the tissues of 5-month old lambs was higher than in those of their mothers. Therefore, a higher transfer coefficient was obtained for lamb muscle (1·8 × 10−1 d kg−1) than for ewe muscle (6·4 × 10−2 d kg−1). Concentration factors were consistently higher for 137Cs than for the transuranics.

[1]  Brenda J. Howard,et al.  Aspects of the uptake of radionuclides by sheep grazing on an estuarine saltmarsh. 1. The influence of grazing behaviour and environmental variability on daily intake , 1985 .

[2]  T. Sumerling.  In-vivo estimates for the uptake of caesium-137 by cattle grazing contaminated pasture around the ESK and IRT estuaries, Cumbria, U.K. , 1981, The Science of the total environment.

[3]  R. McClellan,et al.  Dosimetry of Cæsium-137 in Sheep , 1962, Nature.

[4]  Furchner Je,et al.  COMPARATIVE METABOLISM OF RADIONUCLIDES IN MAMMALS. VII. RETENTION OF ¹°â¶Ru IN THE MOUSE, RAT, MONKEY, AND DOG. , 1971 .

[5]  J Van Den Hoek,et al.  Importance of some methods of pasture feeding, of pasture type and of seasonal factors on 85Sr and 134Cs transfer from grass to milk. , 1969, Health physics.

[6]  R. J. Garner.  Transfer of Radioactive Materials from the Terrestrial Environment to Animals and Man , 1971 .

[7]  A. D. Horrill.  Radionuclide levels and distribution in grazed saltmarsh in West Cumbria , 1984 .

[8]  W. Longhurst,et al.  The comparative metabolism of strontium, calcium and cesium in deer and sheep. , 1965, Health physics.

[9]  Y. C. Ng,et al.  Transfer factors for assessing the dose from radionuclides in agricultural products , 1979 .

[10]  L. A. Buldakov,et al.  Problems of plutonium toxicology , 1970 .

[11]  E. Underwood.  Trace Elements in Human and Animal Nutrition , 1956, Agronomy Journal.

[12]  P. Coughtrey,et al.  Radionuclide distribution and transport in terrestrial and aquatic ecosystems. A critical review of data. Volume 1. , 1983 .

[13]  S. L. Hood,et al.  Metabolism of cesium-137 in rats and farm animals. , 1953, Archives of biochemistry and biophysics.