Fast-neutron and gamma-ray imaging with a capillary liquid xenon converter coupled to a gaseous photomultiplier
| Autor: | Lior Arazi, I. Israelashvili, D. Vartsky, Amos Breskin, A.E.C. Coimbra, E.N. Caspi, S. Shchemelinin |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Photomultiplier
Materials science Physics - Instrumentation and Detectors Physics::Instrumentation and Detectors Astrophysics::High Energy Astrophysical Phenomena Physics::Medical Physics FOS: Physical sciences chemistry.chemical_element Scintillator Radiation 01 natural sciences Xenon Optics 0103 physical sciences Neutron 010306 general physics Instrumentation Mathematical Physics 010308 nuclear & particles physics business.industry Detector Gamma ray Instrumentation and Detectors (physics.ins-det) chemistry Neutron source business |
| Popis: | Gamma-ray and fast-neutron imaging was performed with a novel liquid xenon (LXe) scintillation detector read out by a Gaseous Photomultiplier (GPM). The 100 mm diameter detector prototype comprised a capillary-filled LXe converter/scintillator, coupled to a triple-THGEM imaging-GPM, with its first electrode coated by a CsI UV-photocathode, operated in Ne/5%CH4 cryogenic temperatures. Radiation localization in 2D was derived from scintillation-induced photoelectron avalanches, measured on the GPM's segmented anode. The localization properties of Co-60 gamma-rays and a mixed fast-neutron/gamma-ray field from an AmBe neutron source were derived from irradiation of a Pb edge absorber. Spatial resolutions of 12+/-2 mm and 10+/-2 mm (FWHM) were reached with Co-60 and AmBe sources, respectively. The experimental results are in good agreement with GEANT4 simulations. The calculated ultimate expected resolutions for our application-relevant 4.4 and 15.1 MeV gamma-rays and 1-15 MeV neutrons are 2-4 mm and ~2 mm (FWHM), respectively. These results indicate the potential applicability of the new detector concept to Fast-Neutron Resonance Radiography (FNRR) and Dual-Discrete-Energy Gamma Radiography (DDEGR) of large objects. 27 pages, 17 figures. Submitted to JINST |
| Databáze: | OpenAIRE |
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