Fission foil measurements of neutron and proton fluences in the A0015 experiment

Conference · Wed Feb 01 04:00:00 EST 1995

OSTI ID:42741

Frank, A L; Benton, E V; Armstrong, T W; Colborn, B L ^[1]

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1. Science Applications International Corp., Prospect, TN (United States)

Results are given from sets of fission foil detectors (FFD`s) (Ta-181, Bi-209, Th-232, U-238) which were included in the A0015 experiment to measure combined proton/neutron fluences. Use has been made of recent FFD high energy proton calibrations for improved accuracy of response. Comparisons of track density measurements have been made with the predictions of environmental modeling based on simple 1-D (slab) geometry. At 1 g/cm(exp 2) (trailing edge) the calculations were approximately 25 percent lower than measurements; at 13 g/cm(exp 2) (Earthside) calculations were more than a factor of 2 lower. A future 3-D modeling of the experiment is needed for a more meaningful comparison. Approximate mission proton doses and neutron dose equivalents were found. At Earthside (13 g/cm(exp 2)) the dose was 171 rad and dose equivalent was 82 rem. At the trailing edge (1 g/cm(exp 2)) dose was 315 rad and dose equivalent was 33 rem. The proton doses are less than expected from TLD doses by 16 percent and 37 percent, respectively. These differences can be explained by uncertainties in the proton and neutron spectra and in the method used to separate proton and neutron contributions to the measurements.

• Research Organization: National Aeronautics and Space Administration, Hampton, VA (United States). Langley Research Center
• OSTI ID: 42741
• Report Number(s): N--95-23796; NASA-CP--3275-PT-1; L--17430A-PT-1; NAS--1.55:3275-PT-1; CONF-9311137--; CNN: NAS8-39610
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
EARTH MAGNETOSPHERE
ENERGY SPECTRA
FISSION FOIL DETECTORS
NEUTRON FLUENCE
PROTONS
RADIATION DETECTORS
RADIATION FLUX