Computer Science
Scientific paper
Jan 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992ldef.symp..339c&link_type=abstract
In NASA. Langley Research Center, LDEF: 69 Months in Space. First Post-Retrieval Symposium, Part 1 p 339-346 (SEE N92-23280 14-9
Computer Science
Charged Particles, Galactic Cosmic Rays, Linear Energy Transfer (Let), Long Duration Exposure Facility, Polycarbonates, Radiation Dosage, Energy Spectra, Particle Tracks, Radiation Shielding, Space Flight, Stacks, Water
Scientific paper
The linear energy transfer (LET) spectra of charged particles was measured in the 5 to 250 keV/micron (water) interval with CR-39 and in the 500 to 1500 keV/micron (water) interval with polycarbonate plastic nuclear track detectors (PNTDs) under different shielding depths in the P0006 experiment. The optimal processing conditions were determined for both PNTDs in relation to the relatively high track densities due to the long term exposure in space. The total track density was measured over the selected samples, and tracks in coincidence on the facing surfaces of two detector sheets were selected for measuring at the same position on each sheet. The short range (SR) and Galactic Cosmic Ray (GCR) components were measured separately with CR-39 PNTDs and the integral dose and dose rate spectra of charged particles were also determined. The high LET portion of the LET spectra was measured with polycarbonate PNTDs with high statistical accuracy. This is a unique result of this exposure due to the low flux of these types of particles for typical spaceflight durations. The directional dependence of the charged particles at the position of the P0006 experiment was also studied by four small side stacks which surrounded the main stack and by analyzing the dip angle and polar angle distributions of the measured SR and GCR particle tracks in the main stack.
Benton E. V.
Benton Edward R.
Csige I.
Frank Louis A.
Frigo L. A.
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