Neutron spectra and dose measurement in quasi-mono-energetic high-energy neutron fields

Mares, V.*; Pioch, C.*; Rhm, W.*; Iwase, Hiroshi*; Iwamoto, Yosuke   ; Hagiwara, Masayuki*; Satoh, Daiki   ; Matsumoto, Tetsuro*; Masuda, Akihiko*; Yashima, Hiroshi*; Itoga, Toshiro*; Sato, Tatsuhiko   ; Nakane, Yoshihiro  ; Nakashima, Hiroshi; Sakamoto, Yukio; Harano, Hideki*; Nishiyama, Jun*; Theis, C.*; Feldbaumer, E.*; Jaegerhofer, L.*; Tamii, Atsushi*; Shima, Tatsushi*; Hatanaka, Kichiji*; Nakamura, Takashi*

Measurements of neutron spectra and neutron doses were performed in high-energy neutron fields at the Research Center for Nuclear Physics (RCNP), Osaka University, Japan, using two extended Bonner Sphere Spectrometers (BSS), a WENDI-II REM meter, a DARWIN dosimeter, an extended FUJI REM counter, and the time-of-flight (TOF) method employing NE213 liquid organic scintillators. The quasi-mono-energetic neutron fields were generated by the Li(p,n)Be reaction from a Li target, injected by 246 and 389 MeV protons. The BSS and TOF neutron energy spectra were folded with H*(10) fluence-to-dose conversion coefficients and the resulting values for the neutron ambient dose equivalent were compared with those directly measured by various other instruments used in this experiment. Agreement among all H*(10) neutron doses was very reasonable considering the complexity of the experiment.