Seasonal variations in the transfer of 137Cs and 40K to pasture grass and its ingestion by grazing animals.

Samples of grass and sheep faeces were taken monthly over a 12-month period from three pasture sites. Biomass, 137Cs and 40K were measured. The activity concentration of these two radionuclides in grass was influenced by season and soil type. The seasonal patterns of 137Cs and 40K transfer to grass were inversely related, but evidence is presented which… (More)