Development of two-dimensional differential calibration method for a neutron dosimeter using a thermal neutron beam

We developed a new thermal neutron calibration method to be able to experimentally determine an energy response function of a neutron detector using a pulse parallel beam and the time-of-flight (TOF) technique. The calibration method was experimentally demonstrated for a ³He proportional counter and an electric personal dosimeter using a pulsed thermal neutron beam from the research reactor, JRR-3M. The responses of the detectors were successfully obtained as a function of the neutron energy. To solve the point at issue for the calibration method, we also propose an idea of an improved calibration method using a pulsed narrow beam, the TOF technique and a beam scanning technique. The improved calibration method does not require detailed information of the detector structure.