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- W2974658511 abstract "Inexpensive spectroscopic personal radiation detectors (SPRDs) are needed to monitor environmental radioactivity and search for sources. For gamma spectroscopy, excellent light yield, material uniformity, light yield proportionality, mechanical and environmental ruggedness can be achieved in polycrystalline ceramic oxide garnets. We are building a compact detector based on 14 cm3 of transparent ceramic garnet, formed into 256 pixels (3mm x 3mm x 6mm each) and mounted on two stacked silicon photodiode arrays. GYGAG(Ce) garnet transparent ceramics offer density = 5.8g/cm3, Zeff = 48, principal decay of <100 ns, and light yield of 50,000 Ph/MeV. We obtain R(662 keV) <4% for the full device, including Compton summing of coincident events in multiple pixels. In addition to excellent gamma spectroscopy, this device provides directional detection, via Compton imaging and active masking, for search applications.This work was performed under the auspices of the U.S. DOE by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344. We are grateful to Digirad for supporting our implementation of their photodiode array. Thanks to the US Department of Homeland Security, DNDO and CWMD offices, for funding under competitively awarded IAAs HSHQDC-12-X-00149 and HSHQDN-17-X-00016." @default.
- W2974658511 created "2019-09-26" @default.
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- W2974658511 date "2019-09-17" @default.
- W2974658511 modified "2023-09-26" @default.
- W2974658511 title "Mini direction-finding gamma spectrometer (Conference Presentation)" @default.
- W2974658511 doi "https://doi.org/10.1117/12.2531461" @default.
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