抄録
Several food materials, land and marine products, were analyzed on its contents of calcium and radio-strontium.
Land produce foods, such as rice and wheat, harvested in 1957, contained 11-16mg of calcium per 100g, but strontium unit (SrU: Sr90μμc/Cag) were increased about 10 times of that of 1956 year's ones and amounted to about 100×SrU.
On the other hand, marine products, such as cooking salt contained Sr90 only 14 SrU.
It was considered that SrU content of marine products was less than that of land produced materials, because in the sea, Sr90 would be diluted by sea water.
