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Full-Text Articles in Physical Sciences and Mathematics
A Compton Telescope For Remote Location And Identification Of Radioactive Material, James M. Ryan, Justin Baker, John R. Macri, Mark L. Mcconnell, Richard Carande
A Compton Telescope For Remote Location And Identification Of Radioactive Material, James M. Ryan, Justin Baker, John R. Macri, Mark L. Mcconnell, Richard Carande
Space Science Center
The spare detectors from NASA Compton Gamma-Ray Observatory COMPTEL instrument have been reconfigured to demonstrate the capability at ground level to remotely locate and identify sources of g radiation or the movement of material that might shield γ-ray sources. The Gamma-Ray Experimental Telescope Assembly (GRETA) employs two 28 cm diameter scintillation detectors separated by 81 cm: one 8.5 cm thick liquid scintillator detector and one 7.5 cm thick NaI(Tl) detector. The assembly electronics and real-time data acquisition system measures the energy deposits and time-of- flight for each coincident detection and compiles histograms of total energy and incident angle as computed …
Development And Performance Of The Fast Neutron Imaging Telescope For Snm Detection, James M. Ryan, U Bravar, E O. Fluckiger, John R. Macri, Mark L. Mcconnell, B Pirard, R S. Woolf
Development And Performance Of The Fast Neutron Imaging Telescope For Snm Detection, James M. Ryan, U Bravar, E O. Fluckiger, John R. Macri, Mark L. Mcconnell, B Pirard, R S. Woolf
Space Science Center
FNIT (the Fast Neutron Imaging Telescope), a detector with both imaging and energy measurement capabilities, sensitive to neutrons in the range 0.8-20 MeV, was initially conceived to study solar neutrons as a candidate design for the Inner Heliosphere Sentinel (IHS) spacecraft of NASA's Solar Sentinels program and successively reconfigured to locate fission neutron sources. By accurately identifying the position of the source with imaging techniques and reconstructing the Watt spectrum of fission neutrons, FNIT can detect samples of special nuclear material (SNM), including heavily shielded and masked ones. The detection principle is based on multiple elastic neutron-proton scatterings in organic …
Poet: Polarimeters For Energetic Transients, J E. Hill, Mark L. Mcconnell, Peter F. Bloser, Jason S. Legere, John R. Macri, James M. Ryan, Scott Barthelmy, L Angelini, Takanori Sakamoto, J Kevin Black, H Hartmann, Philip Kaaret, Bing Zhang, Kunihito Ioka, Takashi Nakamura, Kenji Toma, Ryo Yamazaki, X Wu
Poet: Polarimeters For Energetic Transients, J E. Hill, Mark L. Mcconnell, Peter F. Bloser, Jason S. Legere, John R. Macri, James M. Ryan, Scott Barthelmy, L Angelini, Takanori Sakamoto, J Kevin Black, H Hartmann, Philip Kaaret, Bing Zhang, Kunihito Ioka, Takashi Nakamura, Kenji Toma, Ryo Yamazaki, X Wu
Space Science Center
POET (Polarimeters for Energetic Transients) is a Small Explorer mission concept proposed to NASA in January 2008. The principal scientific goal of POET is to measure GRB polarization between 2 and 500 keV. The payload consists of two wide FoV instruments: a Low Energy Polarimeter (LEP) capable of polarization measurements in the energy range from 2–15 keV and a high energy polarimeter (Gamma‐Ray Polarimeter Experiment—GRAPE) that will measure polarization in the 60–500 keV energy range. Spectra will be measured from 2 keV up to 1 MeV. The POET spacecraft provides a zenith‐pointed platform for maximizing the exposure to deep space. …