Radioactivity survey data in Japan, number 77 June 1986

This report provides radioactivity survey data in environmental and dietary materials as of June 1986. The concentrations of strontium-90 and cesium-137 are presented in terms of the following: total diet, rice, milk, vegetables, tea, sea fish, shellfish, and seaweeds. The samples were sent to the Japan Chemical Analysis Center from 32 contracted prefectures. The samples were prepared for radiochemical analysis. The concentrations of strontium-90 and cesium-137 in respective samples are tabulated. The maximum concentrations of strontium-90 and cesium-137 were 5.0 +- 0.40 pCi/p · d and 15 +- 0.5 pci/p · d, respectively, for total diet; 0.3 +- 0.19 pCi/Kg and 2.1 +- 0.22 pci/Kg for rice (producing districts); 0.5 +- 0.18 pCi/Kg and 6.7 +- 0.30 pci/Kg for rice (consuming districts); 2.4 +- 0.26 pCi/l and 7.9 +- 0.37 pci/l for milk (producing districts for domestic program); 5.2 +- 0.35 pCi/l and 98 +- 1.2 pci/l for milk (producing districts for WHO program); 2.4 +- 0.31 pCi/l and 23 +- 0.6 pci/l for milk (consuming districts); 34 +- 1.0 pCi/Kg and 310 +- 3 pci/Kg for powdered milk; 19 +- 0.8 pCi/Kg and 2.4 +- 0.21 pci/Kg for vegetables (producing districts); 3.9 +- 0.41 pCi/Kg and 1.5 +- 0.21 pci/Kg for vegetables (consuming districts); 150 +- 5 pCi/Kg and 4100 +- 21 pci/Kg for Japanese tea; 0.7 +- 0.26 pCi/Kg and 19 +- 0.6 pci/Kg for sea fish; 0.0 +- 1.5 pCi/Kg and 8.7 +- 0.76 pci/Kg for shellfish; and 1.3 +- 0.32 pCi/Kg and 8.5 +- 0.41 pci/Kg for seaweeds. (Namekawa, K.)