Neutron transport associated with the galactic cosmic-ray cascade
- Univ. of Arizona, Tucson, AZ (United States)
As spacecraft and people venture into space, they must be protected from the damaging radiation in the form of heavy, fast ions called galactic cosmic rays, coming from deep space and our own sun. Unfortunately, the material used to shield the spacecraft's interior creates a secondary radiation field that is more damaging than the original radiation. The secondary radiation is caused by the collision and fragmentation of ions and shield nuclei, which create lighter ions. These collisions and fragmentations continue until protons and neutrons are created. The total process is called the galactic cosmic-ray cascade, and the prediction of the radiation dose from this cascade is important for the design of space vehicles. The personnel in the High Energy Physics Division at the National Aeronautics and Space Administration's Langley Research Center has created the BRYNTRN computer program to predict the dose from the galactic cosmic-ray cascade. It is based on analytical and empirical high-energy baryon interaction calculations and a numerical solution to the continuous slowing-down and straight-ahead formulation of the integral Boltzmann transport equation for each ion. An analytical solution to the galactic cosmic-ray cascade, GIT, was created and used as a benchmark for BRYNTRN. However, both BRYNTRN and GIT assume that neutrons do not scatter. The purpose of this work is to extend the benchmark capability to treat neutrons realistically by coupling the GIT program to an analytical neutron transport solver based on the F[sub N] method.
- OSTI ID:
- 6904500
- Report Number(s):
- CONF-931160-; CODEN: TANSAO
- Journal Information:
- Transactions of the American Nuclear Society; (United States), Vol. 69; Conference: American Nuclear Society (ANS) winter meeting, San Francisco, CA (United States), 14-18 Nov 1993; ISSN 0003-018X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SPACE VEHICLES
SHIELDING
ANALYTICAL SOLUTION
B CODES
G CODES
MATHEMATICAL MODELS
NEUTRON TRANSPORT
RADIATION DOSES
RADIATION EFFECTS
SECONDARY COSMIC RADIATION
COMPUTER CODES
COSMIC RADIATION
DOSES
IONIZING RADIATIONS
NEUTRAL-PARTICLE TRANSPORT
RADIATION TRANSPORT
RADIATIONS
VEHICLES
663610* - Neutron Physics- (1992-)