1. 3) SUGIHARA, T. T. and V. T. BOWEN (1959): Radiochemical separation of fission products from large volumes of sea water. Analytical Chemistry, 31 (1), 44-49.
2. 4) HIGANO, R. and M. SHIOZAKI (1960): Radioche-mical analysis of strontium 90 and cesium 137 in sea water. Contributions from the Mar. Res. Lab. Hydro. Office Japan, 1 (2), 137-145.
3. 5) YAMAGATA, N. and S. MAT UDA (1957): Cs 137 Concentration in the Coastal water of Japan. Bull. Chem. Soc. Jap., 32, 497-502.
4. 8) FOLSOM, T. R. (1962): Variation of Cs 137 in California coastal sea waterJour. Rad. Res., 2 (1), 1-4.
5. 10) MIYAKE et al. (1961): Cesium 137 and stron-tium 90 in sea water. Jour. Rad. Res., 2 (1), 25-28.