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HZETRN: neutron and proton production in quasi-elastic scattering of GCR heavy-ionsThe development of transport models for radiation shielding design and evaluation has provided a series of deterministic computer codes that describe galactic cosmic radiation (GCR), solar particle events, and experimental beams at particle accelerators. These codes continue to be modified to accommodate new theory and improvements to the particle interaction database (Cucinotta et al., 1994, NASA Technical Paper 3472, US Government Printing Office, Washington DC). The solution employed by the heavy-ion transport code HZETRN was derived with the assumption that nuclear fragments are emitted with the same velocity as the incident ion through velocity conserving nuclear interactions. This paper presents a version of the HZETRN transport code that provides a more realistic distribution of the energy of protons and neutrons emitted from GCR interactions in shields. This study shows that the expected GCR dose equivalent is lower than previously calculated for water shields that are less than 110 g cm-2 thick. Calculations of neutron energy spectra in low Earth orbit indicate substantial contributions from relativistic neutrons. c2001 Elsevier Science Ltd. All rights reseved.
Document ID
20040088455
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Shavers, M. R.
(Loma Linda University Radiobiology Program 11175 Campus Street, CSP A-1010 Loma Linda, CA 92354, United States)
Cucinotta, F. A.
Wilson, J. W.
Date Acquired
August 21, 2013
Publication Date
June 1, 2001
Publication Information
Publication: Radiation measurements
Volume: 33
Issue: 3
ISSN: 1350-4487
Subject Category
Aerospace Medicine
Distribution Limits
Public
Copyright
Other
Keywords
NASA Center LaRC
NASA Discipline Radiation Health

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