RADIOSTRONTIUM IN SOIL, GRASS, MILK AND BONE IN THE UNITED KINGDOM 1956 RESULTS

摘要

The results of 90Sr analysis of soil, grass and sheep bone from twelve stations in England and Wales are given. The 90sr in the top 4 inches of undisturbed soil in July, 1956 ranged from 1.9 to 10.0 mc/km2, depending on the rainfall. The 90Sr activity of herbage and of sheep bone showed a wider range, samples from acid hill soils being relatively more active. Milk from Somerset had a median activity of 4.4 µµc 90Sr/g ca in 1956, compared with 4.1 in 1955.nHuman bone specimens obtained in 1956 showed 90Sr activity depending on age. The average level in children under 5 was 0.7 µµc 90Sr/g Ca, and the average bone dose 2 mrad/year.