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Pu 239
The plutonium enclosed in the capsules was ex-tracted from reprocessed fuel used in the first Japanese reactor for research (JRR-3) at the Japan Nuclear Power Research Institute between March and May 1968. One gram of 239PuO2 was placed in gold foil and double-sealed within zircaloy and stainless steel containers, each 3mm thick. The Japan Nuclear Power Research Institute is concerned with research and development according to a nuclear power programme drawn up by the Japanese Government. The Institute was established on June 15th, 1956. In 1970,2,154 persons were employed by the organization.