Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8250614 | Radiation Measurements | 2016 | 7 Pages |
Abstract
An alpha particle detector was developed for continuous air monitoring of radioactive contamination in working chambers at plutonium handling facilities. A 5-cm-square Gd2Si2O7:Ce (cerium-doped gadolinium pyro-silicate, GPS:Ce) mosaic scintillator plate for alpha particle measurements was fabricated from GPS single-crystal grains of around 550 μm diameter; the GPS grains were made of a GPS polycrystalline body grown using a top seeded solution method. The scintillator layer thickness was approximately 100 μm. The surface filling rate of the GPS grains was ca. 62%. To suppress the influence of non-uniformity of pulse heights of a photomultiplier tube, a central part of â
40Â mm of a 76-mm-diameter photomultiplier tube was used. In addition, 3Â mm thick high-transmission glass was used as a substrate of the scintillator plate. The detector achieved energy resolution of 13% for 5.5Â MeV alpha particles, detection efficiency of 61% and a radon progeny nuclide reduction ratio of 64.5%. A new alpha particle detector was developed to achieve a high radon progeny nuclide reduction ratio approaching that of a silicon semiconductor detector, with high resistance to electromagnetic noise and corrosion.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Radiation
Authors
Junichi H. Kaneko, Kenji Izaki, Kouhei Toui, Takehiro Shimaoka, Yuki Morishita, Youichi Tsubota, Mikio Higuchi,