Highly Radioactive Fallout Particles Ingested by Mice

概要

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Some highly radioactive fallout particles were collected on two days after the third Chinese nuclear explosion on May 9, 1966. The particles were spherical or oval ranging mostly from 10 to 20μ in diameter and were yellowish or reddish brown. Each of eight male albino mice (21.0〜36.8 g) was given orally a small piece of cheese onto which one particle was attached. One mouse (No. 9, in Table 1) was given successively nine pieces of cheese sticking one particle each. The mice were maintained with standard compressed diet and tap water ad libitum. All the particles were excreted in feces within 20 hours after the administration of the particles except No. 7 mouse (20〜27 h). As shown in Table 1, radioactive recovery was almost 100 per cent. The radioactivity was not detected in urine. No radioactivity was detected with low-background counter in ash of No. 9 mouse which was ashed at 450℃ after excretion of the particles. The changes in shape and in size of the particle after passage through the alimentary canal were not observed.
日本放射線影響学会の論文