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Report No.
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Characterization of the PTW 34031 ionization chamber (PMI) at RCNP with high energy neutrons ranging from 100 - 392 MeV

Theis, C.*; Carbonez, P.*; Feldbaumer, E.*; Forkel-Wirth, D.*; Jaegerhofer, L.*; Pangallo, M.*; Perrin, D.*; Urscheler, C.*; Roesler, S.*; Vincke, H.*; Widorski, M.*; Iwamoto, Yosuke  ; Hagiwara, Masayuki*; Satoh, Daiki  ; Iwase, Hiroshi*; Yashima, Hiroshi*; Matsumoto, Tetsuro*; Masuda, Akihiko*; Nishiyama, Jun*; Harano, Hideki*; Itoga, Toshiro*; Nakamura, Takashi*; Sato, Tatsuhiko  ; Nakane, Yoshihiro ; Nakashima, Hiroshi; Sakamoto, Yukio*; Taniguchi, Shingo*; Nakao, Noriaki*; Tamii, Atsushi*; Shima, Tatsushi*; Hatanaka, Kichiji*

At CERN, gas-filled ionization chambers PTW-34031 (PMI) are commonly used in radiation fields including neutrons, protons and $$gamma$$-rays. A response function for each particle is calculated by the radiation transport code FLUKA. To validate a response function to high energy neutrons, benchmark experiments with quasi mono-energetic neutrons have been carried out at RCNP, Osaka University. For neutron irradiation with energies below 200 MeV, very good agreement was found comparing the FLUKA simulations and the measurements. In addition it was found that at proton energies of 250 and 392 MeV, results calculated with neutron sources underestimate the experimental data due to a non-negligible gamma component originating from the target $$^{7}$$Li(p,n)Be reaction.

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