Radioactivity survey data in Japan, part 2. Dietary materials

The publication is aimed at providing radioactivity survey data in environmental and dietary materials in Japan. Part 2 gives dietary materials, consisting of total diet, milk, vegetables, sea fish, freshwater fish, shellfish, and seaweeds. Samples were collected from 42 sampling locations during the period between May 1989 and June 1990, and were sent to the Japan Chemical Analysis Center for radiochemical analysis. Strontium-90 and cesium-137 in these dietary materials are tabulated. The maximum concentrations of strontium-90 and cesium-137 were as follows: 0.16±0.017 Bq/p·d and 0.20±0.014 Bq/p·d, respectively, for total diet; 0.10±0.011 Bq/l and 1.0±0.03 Bq/l for milk (producing districts); 0.08±0.010 Bq/l and 0.14±0.010 Bq/l for milk (consuming districts); 0.55±0.026 Bq/Kgwet and 1.2±0.03 Bq/Kgwet for vegetables (producing districts); 0.34±0.023 Bq/Kgwet and 0.05±0.009 Bq/Kgwet for vegetables (consuming districts); 0.02±0.011 Bq/Kgwet and 0.25±0.026 Bq/Kgwet for sea fish; 5.5±0.09 Bq/Kgwet and 0.082±0.033 Bq/Kgwet for freshwater fish; 0.01±0.010 Bq/Kgwet and 0.06±0.009 Bq/Kgwet for shellfish; and 0.03 ±0.009 Bq/Kgwet and 0.03±0.006 Bq/Kgwet for seaweeds. Yearly changes in the concentrations of both strontium-90 and cesium-137 from 1986 through 1990 are given in figures. (J.P.N.)