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Microchannel Plate Detection Efficiency to Monoenergetic Photons Between 0.66 and 20 MeV

Blase, Ryan C. ; Benke, Roland R. ; Pickens, Keith S. ; Waite, J. Hunter

IEEE transactions on nuclear science, 2018-04, Vol.65 (4), p.980-988 [Periódico revisado por pares]

New York: IEEE

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Título:
Microchannel Plate Detection Efficiency to Monoenergetic Photons Between 0.66 and 20 MeV
Autor: Blase, Ryan C. ; Benke, Roland R. ; Pickens, Keith S. ; Waite, J. Hunter
Assuntos: Bremsstrahlung ; Detectors ; Energy measurement ; Free electron lasers ; Gamma rays ; Instruments ; Laser beams ; Microchannel plates ; Microchannels ; Noise levels ; photon beams ; Photonics ; Photons ; Radiation ; Radiation transport ; radiation transport modeling ; Radioactive emissions ; Space exploration ; space radiation effects ; space radiation environments
É parte de: IEEE transactions on nuclear science, 2018-04, Vol.65 (4), p.980-988
Descrição: Southwest Research Institute investigated the response of a microchannel plate (MCP) detector to isotropic radioactive source emissions at photon energies of 0.662 and approximately 1.25 million electronvolts (MeV) and to a beam of monoenergetic photons (gamma rays) at 2.5, 5, 7, 10, 13, and 20 MeV in the Free Electron Laser Laboratory at Duke University. These measurements were performed to quantify anticipated noise levels of a mass spectrometer instrument for space exploration in a harsh radiation environment and included various incident angles of radiation on the MCP. Measured photon detection efficiencies at 0° incident angle to 0.662 and 1.25 MeV were approximately 0.3%-0.4% and are bracketed by previously published data. In the 2.5- to 20-MeV energy range for which comparable published data are not available, measured detection efficiencies were on the order of 0.02%-0.2%. Radiation transport simulations were compared to the experimental results and showed decent agreement. The measured detection efficiency increased as the incident photon angle was changed from being normal to the MCP surface (0°) to being aligned with the MCP edge (90°). At greater off-axis angles, photons were incident on the side of the detector cartridge and generated secondary radiation from photon interactions in the cartridge materials that subsequently registered MCP counts.
Editor: New York: IEEE
Idioma: Inglês

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Microchannel Plate Detection Efficiency to Monoenergetic Photons Between 0.66 and 20 MeV

Blase, Ryan C. ; Benke, Roland R. ; Pickens, Keith S. ; Waite, J. Hunter

New York: IEEE

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