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This paper describes the 3 MeV neutron field where the neutrons are generated in the D(d,n) 3 He reaction by bombardment of a deuterium-titanium target with a 230 keV deuteron beam from a Cockcroft-Walton accelerator. The neutron field is being prepared for a new national standard on neutron fluence in Japan. The neutron fluence was measured using a proton recoil neutron detector consisting of a silicon surface barrier detector with a polyethylene radiator and the results were compared with data obtained by measuring 3 MeV protons from the D(d,p)T reaction in the deuterium-titanium target in a manner similar to the associated particle method. Neutron spectra were measured using a newly developed recoil proton spectrometer composed of three position sensitive proportional counters and two silicon surface barrier detectors. The gamma rays existing in the field were also characterized using a liquid organic scintillation detector. The ambient dose equivalents were estimated to be of the order of a few µSv at a neutron fluence of 10 7 neutrons cm -2 .

CHARACTERIZATION OF THE 2.5 MEV NEUTRON FIELD FOR MONOENERGETIC FAST NEUTRON FLUENCE STANDARD AT THE NATIONAL METROLOGY INSTITUTE OF JAPAN