Abstract
The concentration of radioiodine (I-131) in milk in Japan was determined daily after explosion in five nuclear bomb tests by the Red China.
As the result:
1) The contamination of milk by radioiodine was detected very clearly and rapidly.
2) The maximum concentration of radioiodine in milk in Chiba was elevated to 400 pCi/l in the first test, and the radioactive contamination continued during the period of about one month.
3) In the cases of the second to the fifth tests, the increase of radioiodine in milk was relatively low, and the activity disappeared within 7-10 days after each explosion.
