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Report No.

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

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

The Accurate Neutron-Nucleus Reaction measurement Instrument has been available for time-of-flight (TOF) prompt $$gamma$$-ray analysis. However, the specific relationship between the number of detected events and the sample weight is not entirely clear. In this study, a set of standard Fe and Ag samples were measured to investigate the factors which affect the $$gamma$$ counts and TOF counts. It is found that live time of acquisition ($$tau$$), data acquisition efficiency in live time ($$delta$$), neutron attenuation (NA) and $$gamma$$-ray attenuation (GA) are the main contributing factors. An empirical formula is proposed for the calibration of $$delta$$. Simulation models are built for the evaluations of NA and GA by the PHITS program. The values of corrected $$gamma$$ and TOF counts are simply proportional to the sample weight. An accuracy of typically 5% has been achieved for the corrected result of a standard sample. It is sufficient for quantitative analysis.



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