Development of Self-TOF Neutron Detector and its Application to Shielding Experiment at HIMAC

A new type detector, called ‘Self-TOF detector’, has been developed for high energy neutron spectrometry behind a shield by our group. The detector consists of a veto counter, a set of radiators with 20 thin detectors, a start counter and a stop counter of nine segments. The measurement of the detector response function for high energy neutrons and the concrete shielding experiment were done at the HIMAC(Heavy-Ion Medical Accelerator in Chiba) of NIRS(National Institute of Radiological Sciences), Japan. Neutron spectra were also compared with the LCS(LAHET Code System). Both results are in rather good agreement within a factor of 2.