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- 저자 : Yosuke Toh (검색결과 2 건)
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Development of a DDA+PGA-combined non-destructive active interrogation system in “Active-N″
Furutaka Kazuyoshi,Ohzu Akira,Toh Yosuke 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.11
An integrated neutron interrogation system has been developed for non-destructive assay of highly-radioactive special nuclear materials, to accumulate knowledge of the method through developing and using it. The system combines a differential die-away (DDA) measurement system for the quantification of nuclear materials and a prompt gamma-ray analysis (PGA) system for the detection of neutron poisons which disturb the DDA measurements; a common D-T neutron generator is used. A special care has been taken for the selection of materials to reduce the background gamma rays produced by the interrogation neutrons. A series of measurements were performed to test the basic performance of the system. The results show that the DDA system can quantify plutonium of as small as 20 mg and it is not affected by intense neutron background up to 1.57 × 107 s 1 and gamma ray of 4.43 × 1010 s 1. The gamma-ray background counting rate at the PGA detector was reduced down to 3.9 × 103 s 1 even with the use of the D-T neutron generator. The test measurements show that the PGA system is capable of detecting 0.783 g of boron and about 86.8 g of gadolinium in 30 min.
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Mitsuru Ebihara,Naoki Shirai,Jin Kuwayama,Yosuke Toh 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.2
Very low contents (in the range of 10 9 g/g) of Ir in mantle-derived rock samples (komatiites) were nondestructively determined by INAA coupled with coincidence gamma-ray spectrometry using 16 Ge detectors. Aliquots of the same samples were analyzed by NiS fire-assay ICP-MS for Ir and other platinumgroup elements. Because the INAA procedure used in this study is non-destructive and is almost freefrom spectral interference in gamma-ray spectrometry, the INAA values of Ir contents obtained in thisstudy can be highly reliable. Iridium values obtained by ICP-MS were consistent with the INAA values,implying that the ICP-MS values of Ir obtained in this study are equally reliable. Under the presentexperimental conditions, detection limits were estimated to be 1 pg/g, which corresponds to 0.1 pg for asample mass of 0.1 g. These levels can be even lowered by an order of magnitude, if necessary, whichcannot be achieved by ICP-MS carried out in this study.
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