出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：This paper describes the 3 MeV neutron field where the neutrons are generated in the D(d,n)3He
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 107 neutrons cm-2.
