Thermal neutron detector, scintillator unit and thermal neutron detection system

摘要

The scintillator unit of the thermal neutron detection device of the embodiment is laminated on the scintillator layer that emits light upon incidence of γ rays or charged particles, and the incident side of the γ rays or charged particles of the scintillator layer. A first cell region containing a 6Li compound as a nuclear capture reaction material that wakes up to generate the charged particles and a second cell region not containing the nuclear capture reaction material are along the incident surface of the γ-rays or charged particles. And the two-dimensionally distributed nuclear capture reaction layers, and the optical sensor array unit is disposed on the scintillator layer side of the scintillator unit and emits light corresponding to each of the first cell region and the second cell region. The amount of light emitted can be detected, and the difference between the amount of light emitted corresponding to the first cell region and the amount of light emitted corresponding to the second cell region is obtained, so that the thermal neutron It is possible to accurately detect the amount of irradiation (neutron flux). Furthermore, the scintillator unit is driven in synchronism with the detection operation so that the light receiving positions of the first cell region and the second cell region in the photosensor array unit are alternately switched. Can be detected.