Response measurements of a neutron dosimeter for epi-thermal region using a pulsed white beam

It is indispensable to precisely evaluate energy-dependent responses of neutron dosimeters and neutron detectors for radiation protection. The responses of neutron dosimeters are usually evaluated using calibration with monoenergetic neutrons and calculations. However, it is not easy to produce mono-energetic neutrons for the epi-thermal neutron region. In the present study, energy dependent response of a neutron dosimeter is experimentally evaluated by the time-of-flight (TOF) method using a pulsed white neutron source with thermal and epi-thermal energy region. The pulsed white neutrons were produced by the Ta(γ,n) reaction and a moderation process using an electron LINAC of the Kyoto University. Neutron spectral fluence were measured with a total absorption BGO detector using an enriched 10 B sample, a 6 Li-glass scintillator and an organic liquid scintillator by means of the TOF method. Finally, we successfully obtained an energy-dependent response of an electronic neutron dosimeter for epithermal energy region using the pulsed white neutrons by means of the TOF method.