Neutron ray detecting system, and method of setting neutron ray detecting system

A method of setting a neutron ray detecting system that detects neutron rays, the system including

• a scintillator that generates light when radiant rays enter the scintillator,
• an optical fiber that allows the light generated in the scintillator to be transmitted therethrough, and
• a discrimination unit that receives the light transmitted through the optical fiber, and discriminates a detection signal relating to the received light from a signal relating to the neutron rays in a case where a wave height of the detection signal exceeds a determination threshold value, the setting method comprising:
• a detection signal acquiring process of acquiring a first detection signal that is the detection signal of the radiant rays that have entered the scintillator via a filter that cuts the neutron rays, and a second detection signal that is the detection signal of the radiant rays that have entered the scintillator without the filter;
• a wave height distribution acquiring process of acquiring a neutron ray wave height distribution of only the neutron rays and a gamma ray wave height distribution of only the gamma rays included in the radiant rays on the basis of a difference between the first detection signal and the second detection signal;
• and
• a determination threshold value adjusting process of adjusting the determination threshold value on the basis of the neutron ray wave height distribution and the gamma ray wave height distribution.

A neutron ray detecting system that detects neutron rays, the system comprising:

• a scintillator that generates light when radiant rays enter the scintillator;
• an optical fiber that allows the light generated in the scintillator to be transmitted therethrough;
• a discrimination unit that receives the light transmitted through the optical fiber, and discriminates a detection signal relating to the received light from a signal relating to the neutron rays in a case where a wave height of the detection signal exceeds a determination threshold value;
• a display unit that displays information;
• and a determination threshold value setting unit that sets the determination threshold value, wherein the display unit displays a notification for guiding input of a detection accuracy, and displays, after the determination threshold value setting unit sets the determination threshold value on the basis of the input detection accuracy, the set determination threshold value.