Reports

Strontium-90 and Cesium-137 in North American Milk

Science  02 Jun 1961:
Vol. 133, Issue 3466, pp. 1768-1770
DOI: 10.1126/science.133.3466.1768

Abstract

The strontium-90 and cesium-137 concentrations in powdered milk in North America vary roughly with the specific activity of rain. The Sr90/Cs137. ratios in over 800 powdered milk samples taken from 60 stations in North America from 1957-60 have a standard deviation of only 44 percent.