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Long-lived neutron-induced radioisotopes in OKtAVIAN facility concrete wall after 38 year-operation

辐射防护 2020年第6期40卷 577-582页

作者： Fajar Panuntun Shingo tamaki Sachie Kusaka Fuminabo Sato Isao Murata Graduate School of Engineering Osaka UniversityYamadaoka 2-1SuitaOsaka565-0871Japan

An intense 14 MeV neutron source facility named OKtAVIAN was installed in the A15 building,Osaka University in *** the operation period,new radioisotopes with various half-life have been produced as neutron activation products in its concrete wall *** this work,we investigated the concrete wall in the heavy irradiation room of OKtAVIAN using gamma spectrometry method to discover the presence of radioisotope having large half-life value(long-lived radioisotope)as neutron activation *** simulations were performed prior to measurement to predict the presence of long-lived radioisotopes by employing MCNP5 and FISPACt codes.A pre-calibrated Germanium detector with high energy resolution was employed to measure the *** long-lived activation products have been observed such as 152 Eu,54 Mn,65 Zn,22 Na and 60 *** activity of each radioisotope was derived after estimating the detector efficiency using *** a result of the measurement and analysis,the followings are concluded:(1)though presence of activation products represents radiological risk to everyone who performs an experimental activity in the irradiation room of the OKtAVIAN facility,the present result shows that past experiments were carried out safely without any significant additional exposure dose coming from the wall for the last 38 years.(2)the approximated total fluence of d-t neutrons to the wall was successfully estimated from the produced radioisotope,152 Eu,because it has the longest half-life of 13.5 years among the observed radioisotopes.(3)From the results of(1)and(2),it could be possible to estimate the total activity of the concrete wall in the OKtAVIAN facility,which is very essential and important information,because this would be very valuable for decommissioning or disposal of the facility in the future.

关键词： OKtAVIAN concrete wall shielding long-lived neutron-induced product total fluenced d-t neutron

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