title: High-energy neutron spectroscopy with thick silicon detectors.
abstract: The high-energy neutron component of the space radiation environment in thick structures such as the International Space Station contributes to the total radiation dose received by an astronaut. Detector design constraints such as size and mass have limited the energy range of neutron spectrum measurements in orbit to about 12 MeV in Space Shuttle studies. We present a new method for high-energy neutron spectroscopy using small silicon detectors that can extend these measurements to more than 500 MeV. The methodology is based on measurement of the detector response function for high-energy neutrons and inversion of this response function with measured deposition data to deduce neutron energy spectra. We also present the results of an initial shielding study performed with the thick silicon detector system for high-energy neutrons incident on polyethylene.
authors.affiliation: The Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland 20723, USA. jim.kinnison@jhuapl.edu
authors.forename: James D
authors.initials: JD
authors.lastname: Kinnison
authors.forename: Richard H
authors.initials: RH
authors.lastname: Maurer
authors.forename: David R
authors.initials: DR
authors.lastname: Roth
authors.forename: Robert C
authors.initials: RC
authors.lastname: Haight
mesh_terms: D019471:Elementary Particle Interactions; D005214:Fast Neutrons; D020959:Polyethylene; D011874:Radiometry / Q000295:instrumentation* / Q000379:methods*; D015203:Reproducibility of Results; D012107:Research Design; D012588:Scintillation Counting; D012680:Sensitivity and Specificity; D012825:Silicon; D013026:Space Flight; D013057:Spectrum Analysis / Q000295:instrumentation* / Q000379:methods*
chemical_list: D020959:Polyethylene; D012825:Silicon