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Report No.

Development of an alpha dust monitor using a GPS scintillator plate

Morishita, Yuki; Kaneko, Junichi*; Higuchi, Mikio*; Izaki, Kenji; Yajima, Tatsuo*; Matsuura, Mitsugu*; Tamura, Ken; Torii, Tatsuo

A dust monitor with a silicon surface barrier detector (SSBD) is introduced at a nuclear fuel facility to detect airborne contamination of $$^{238}$$Pu and $$^{239}$$Pu released by past accidents. However, an SSBD frequently produces false alarms, especially in a room with high humidity. We developed an alpha-particle spectrometer based on a cerium-doped Gd$$_{2}$$Si$$_{2}$$O$$_{7}$$ (GPS) scintillator plate and a photomultiplier tube (PMT). The energy resolution for 5.5-MeV alpha particles was $$sim$$11.9% $$pm$$ 0.2% of the FWHM. The efficiency was 92%, and it had a uniform sensitivity. By applying an energy window, the count-rate of the Rn progeny decreased by 77%. The GPS scintillator plate was able to measure the alpha spectrum even though the GPS scintillator got wet.



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Category:Nuclear Science & Technology



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