Development of correction methods for the time-of-flight prompt -ray analysis at ANNRI

ANNRIにおける飛行時間法を用いた即発線分析のための補正法開発

Huang, M.; 藤 暢輔   ; 海老原 充*; 木村 敦   ; 中村 詔司  

Huang, M.; Toh, Yosuke; Ebihara, Mitsuru*; Kimura, Atsushi; Nakamura, Shoji

Prompt Gamma-ray Analysis (PGA) and neutron resonance capture analysis (NRCA) are well-known non-destructive methods for elemental determination. Their sensitivities and resolutions highly depend on elements. At J-PARC ANNRI, the two methods have been combined as a new analytical method, TOF-PGA. PGA, TOF and TOF-PGA spectra can be obtained simultaneously. Each element can be analyzed by the most suitable spectrum. However, the relationship between the number of detected events and the sample weight is not clear. In this study, a set of standard Fe, Ag and Au samples were measured to examine the factors which affect the -ray counts and TOF counts. It is found that the main contributing factors are live-time ratio of the data acquisition system (), signal pile-up correction factor (), neutron attenuation (NA) and -ray attenuation (GA). In this study, a 5.3-kHz random-pulse generator was used for the determination of . was calculated by an empirical formula which was calibrated with the PGA data of 5 g Fe. Simulation models were built for the evaluations of NA and GA by the PHITS program. The correction method was validated and used for the determination of chemical compositions of nickel-based super alloys.