Feasibility study of two-dimensional neutron-resonance thermometry using molybdenum in 316 stainless-steel

ステンレス316中のモリブデンを利用した中性子共鳴2次元温度測定の実現可能性研究

甲斐 哲也   ; 廣井 孝介  ; Su, Y. H.  ; 瀬川 麻里子   ; 篠原 武尚   ; 松本 吉弘*; Parker, J. D.*; 林田 洋寿*; 及川 健一   

Kai, Tetsuya; Hiroi, Kosuke; Su, Y. H.; Segawa, Mariko; Shinohara, Takenao; Matsumoto, Yoshihiro*; Parker, J. D.*; Hayashida, Hirotoshi*; Oikawa, Kenichi

A two-dimensional thermometry technique based on neutron resonance reactions derives the temperature of specified elements in an object by analyzing the Doppler broadening of a neutron resonance measured by a time-analyzing neutron imaging-detector. This technique is expected to be one of the important applications of the energy-resolved neutron imaging system, RADEN, at J-PARC. The authors focused on molybdenum contained in 316 stainless-steel (with a weight fraction of 2-3 wt%). Energy-dependent transmitted neutrons were measured through a 3 mm thick 316 stainless-steel plate placed in a heater at temperatures between 23 and 500 degrees Celsius at RADEN using a gas-electron multiplier (GEM) detector. Thermal and cold neutrons were eliminated from the incident beam by a cadmium filter. The sample area within the neutron beam was 30 by 50 mm. The feasibility is discussed in the presentation.