Analytical studies of three-dimensional evaluation of radionuclide distribution in zeolite wastes through gamma scanning of adsorption vessels

Matsumura, Taichi; Nagaishi, Ryuji; Katakura, Junichi*; Suzuki, Masahide*

Nuclear Science and Engineering, 192(1), p.70 - 79, 2018/10

https://doi.org/10.1080/00295639.2018.1493856

The gamma-scanning of SDS (submerged demineralizer system) vessel used as a typical vessel for decontamination of radioactive water at Three Mile Island Unit 2 (TMI-2) accident was simulated in the axial and radial directions of real and cylindrical-shaped vessels by using a Monte Carlo calculation code (PHITS) on the basis of the geometrical and compositional information of vessel and gamma-scanning available in the previous reports at the accident. In the axial simulation, the true distribution of radioactive Cs in the zeolite packed bed of vessel was successfully evaluated when a correction function derived from a virtual constant distribution of Cs was applied to the reported gamma-scanning profile. In the radial simulation, the virtual disk-formed and shell-formed sources of Cs displaced in the packed bed were clearly observed from the top and bottom views of vessel. This new radial gamma-scanning indicates that the radial localization of Cs could be well observed by measuring gamma-ray from the top view of vessel during storage. We further examined the radial gamma-scanning from the side view whether the radial localization of Cs can be confirmed in the normally existing gamma-scanning room or not.

Microstructure of vapor-deposited ZrC-C alloy

; Ikawa, Katsuichi; ; Iwamoto, K.

Journal of Nuclear Materials, 56(2), p.243 - 245, 1975/02

https://doi.org/10.1016/0022-3115(75)90095-1

no abstracts in English

Measurement of the ratio of fission product gamma activities from Pu and U fissions

Journal of Nuclear Science and Technology, 10(9), p.560 - 565, 1973/09

https://doi.org/10.3327/jnst.10.560

no abstracts in English