The fast neutron detectors used for protection against radiation are desirable to be capable of measuring the dose in rem units, for RBE value of neutron.
varies widely with the energy of neutron. For developing a new type of detector, the energy response of existing detectors should be well acquainted with in advance, but the available data are very few.
By the use of a 2 MeV V. d. G. accelerator, the variation of sensitivity of detectors-various fast neutron scintillators, a Hurst-type proportional counter, BF₃ proportional counters surrounded with paraffin of various thickness, and a Nal scintillator surrounded with paraffin-in the range of 5 keV_??_1.6 MeV of neutron energy is examined, the results of which are compared with the energy dependence of the absorbed dose of fast neutrons.