METHOD AND DEVICE FOR MEASURING INTENSITY DISTRIBUTION OF GAMMA RAY

摘要

PROBLEM TO BE SOLVED: To shorten a time for measuring the intensity distribution of gamma rays in a fuel conjugant.SOLUTION: A turn process for turning the fuel conjugant 11 to a certain measurement angle and a measurement process for measuring the intensity of the gamma rays passing through collimators 14 whose distances from a plane 34 are different by a gamma-ray detector 15 are repeated. Then, the intensity distribution of gamma rays in fuel rods located outside a circle whose radius is the longest distance between the plane 34 and the collimators 14 and whose center is the rotation axis 33 is calculated on the basis of the intensity of the gamma rays measured at a measurement angle of fuel rods more than those located outside the circle. Thereafter, the intensity distribution of the gamma rays in the fuel rods which are located outside a circle whose radius is the second longest distance between the plane 34 and the collimators 14 and where the intensity of gamma rays is not calculated is calculated on the basis of the intensity of the gamma rays measured at a measurement angle of the fuel rods more than the fuel rods 12 and the intensity of the gamma rays that has already been calculated.