1987 Volume 22 Issue 3 Pages 277-281
Fission products such as 89Rb, 131I and radionuclides such as 82Br, 203Hg have been released from the stack of JRR-2 during the reactor operation. It was assumed that these nuclides were generated in experimental holes which were made of Al. In order to certify fission product released from the natural uranium contained in Al material under neutron irradiation in the reactor, Al plates were experimentally irradiated in the irradiation capsule by using the vertical experimental hole of JRR-2. By means of sweeping with carrier gas, the radionuclides generated in the capsule were trapped with filterpaper of cellulose glass fibre, charcoal cartridge, while gaseous samples were collected in sampling vessel. Fission product such as 89Rb, 135Xe and radionuclides such as 82Br, 203Hg were found in the carrier gas. It became clear that the release of fission product originated from natural uranium existing in Al component as impurities, and radionuclides such as 82Br, 203Hg were generated from surface contaminants of Al in the experimental holes.
