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Report No.
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Irradiation tests for 2-dimensional micro-pixel gas chamber using Cf-252 neutrons

To, Kentaro ; Yamagishi, Hideshi; Soyama, Kazuhiko ; Ochi, Atsuhiko*; Tanimori, Toru*

Neutron scattering experiment using high intensity pulsed neutrons will be carried out in Materials and Life Science Facility at J-PARC. Several features are desired for neutron detectors in the experiments. The detectors require features such as a good spatial resolution, high detection efficiency, and fast response. In view of these requirements, we have developed a 2D position sensitive neutron detector system consist of micro-pattern detector array as detection device. In this presentation, characteristics of the 2D micro-pixel gas chamber (MPGC) under Cf-252 neutron irradiation are reported. The irradiation experiments were carried out using a mixture gas of helium and carbon tetrafluoride with total pressures of 4 and 5 atm. Signal pulse peak of neutrons can be identified and be discriminated easily from background noise generated in lower channels. Here, degradation of gas gain arisen from a charge up effect was not observed in our MPGC system.

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