GAMMA THERMOMETER, MANUFACTURING DEVICE THEREOF AND NUCLEAR REACTOR POWER MEASURING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a gamma thermometer capable of reducing the number of calibrations of sensitiveness. SOLUTION: This gamma thermometer has a core tube 102 having a plurality of annular grooves lined in the axial direction, a cover tube 101 press-fitted on the core tube 102, a temperature sensor 105A provided inside the core tube 102 with an axial position set in a position of an annular groove, and a second temperature sensor 105B provided inside the core tube 102 with an axial position set between two adjacent annular grooves. Gas containing inert gas and gaseous hydrogen is filled in an annular void part 103 formed by the cover tube 102 and the annular groove.