Fallout Radioactivity in Diet and Excreta -The Levels at Tokai District, Japan in 1962 to 1963-

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The levels of fission products such as ^<90>Sr, ^<137>Cs, ^<95>Zr, ^<95>Nb, ^<103>Ru and ^<106>Ru in diet and excreta were examined. The experiment started in May, 1962 and ended in Feb. , 1963. During the period, seven intermittent samplings of excreta and diet were made. In each sampling, excreta were collected over five consecutive days from four normal human subjects who took the same diet at that time. An exact duplicate of the diet was collected at the same time. A large NaI(T1) crystal scintillator and an 100 channel pulse height analyser were used to determine the radioactivities of γ-emitters in ashed samples, but ^<90>Sr and ^<137>Cs were analysed radiochemically. In general, the value of ^<95>Nb in the diet was highest among all the radioactive fission nuclides, reaching about 60 μμc/day/person in Feb.,1963. The level of ^<90>Sr in the diet varied between 7.0 and 13 μμc/day/person during the period, and that of ^<137>Cs changed between 13 and 35 μμc/day/person. However, about 1 μμc of ^<90>Sr was always found in 24-hr urine samples, irrespective of the contents in the diet. The activities of ^<137>Cs in the same urine specimens, in contrast to ^<90>Sr, changed between 10 and 31 μμc corresponding to the contents in the diet. During the period examined, the levels of ^<137>Cs and ^<95>Zr+^<95>Nb in the diet varied according to the changes of the dry fallout in the atmosphere. The amount of stable potassium and calcium in the diet and excreta were also examined.
日本放射線影響学会の論文

Fallout Radioactivity in Diet and Excreta -The Levels at Tokai District, Japan in 1962 to 1963-

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