Development of Neutron Measurement in Intense Gamma Field Using New Type of Nuclear Emulsion

    Volume 9, Issue 3 (March 2012)

    ISSN: 1546-962X

    CODEN: JAIOAD

    Published Online: 1 March 2012

    Page Count: 5


    Kawarabayashi, J.
    Nagoya Univ., Nagoya, Aichi

    Ishihara, K.
    Nagoya Univ., Nagoya, Aichi

    Takagi, K.
    Nagoya Univ., Nagoya, Aichi

    Tomita, H.
    Nagoya Univ., Nagoya, Aichi

    Iguchi, T.
    Nagoya Univ., Nagoya, Aichi

    Naka, T.
    Nagoya Univ., Nagoya, Aichi

    Morishima, K.
    Nagoya Univ., Nagoya, Aichi

    Maeda, S.
    Japan Atomic Energy Agency, Oarai-machi, Ibaragi

    (Received 19 May 2011; accepted 21 November 2011)

    Abstract

    To precisely measure the neutron emissions from a spent fuel assembly of a fast breeder reactor, we formed nuclear emulsions based on a non-sensitized Oscillation Project with Emulsion tRacking Apparatus (OPERA) film with AgBr grain sizes of 60, 90, and 160 nm. The efficiency for 252Cf neutron detection of the new emulsion was calculated to be 0.7 × 10−4, which corresponded to an energy range from 0.3 to 2 MeV and was consistent with a preliminary estimate based on experimental results. The sensitivity of the new emulsion was also experimentally estimated by irradiating with 565 keV and 14 MeV neutrons. The emulsion with an AgBr grain size of 60 nm had the lowest sensitivity among the above three emulsions but was still sensitive enough to detect protons. Furthermore, the experimental data suggested that there was a threshold linear energy transfer of 15 keV/μm for the new emulsion, below which no silver clusters developed. Further development of nuclear emulsion with an AgBr grain size of a few tens of nanometers will be the next stage of the present study.


    Paper ID: JAI104007

    DOI: 10.1520/JAI104007

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    Title Development of Neutron Measurement in Intense Gamma Field Using New Type of Nuclear Emulsion
    Symposium , 0000-00-00
    Committee E10