Mini direction-finding gamma spectrometer  (Conference Presentation)

Sean O'Neal; Erik Swanberg; Nerine J. Cherepy; Zachary Seeley; Stephen Payne; Joel Kindem

doi:10.1117/12.2531461

17 September 2019 Mini direction-finding gamma spectrometer (Conference Presentation)

Sean O'Neal, Erik Swanberg, Nerine J. Cherepy, Zachary Seeley, Stephen Payne, Joel Kindem

Proceedings Volume 11114, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXI; 111140B (2019) https://doi.org/10.1117/12.2531461
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

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.

Conference Presentation

Citation Download Citation

Sean O'Neal, Erik Swanberg, Nerine J. Cherepy, Zachary Seeley, Stephen Payne, and Joel Kindem "Mini direction-finding gamma spectrometer (Conference Presentation)", Proc. SPIE 11114, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics XXI, 111140B (17 September 2019); https://doi.org/10.1117/12.2531461

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