Radiation exposure of LDEF: Initial results

Details Radiation exposure of LDEF: Initial results Radiation exposure of LDEF: Initial results

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992ldef.symp..325b&link_type=abstract

In NASA. Langley Research Center, LDEF: 69 Months in Space. First Post-Retrieval Symposium, Part 1 p 325-337 (SEE N92-23280 14-9

Physics

Leading Edges, Linear Energy Transfer (Let), Long Duration Exposure Facility, Radiation Detectors, Radiation Dosage, Trailing Edges, Anisotropy, Charged Particles, Neutrons, Particle Energy, Position (Location), Protons, Radiation Shielding

Scientific paper

Initial results from LDEF include radiation detector measurements from four experiments, P0006, P0004, M0004, and A0015. The detectors were located on both the leading and trailing edges of the orbiter and also on the Earthside end. This allowed the directional dependence of the incoming radiation to be measured. Total absorbed doses from thermoluminescent detectors (TLDs) verified the predicted spatial east-west dose ratio dependence of a factor approx. 2.5, due to trapped proton anisotropy in the South Atlantic Anomaly. On the trailing edge of the orbiter a range of doses from 6.64 to 2.91 Gy were measured under Al equivalent shielding of 0.42 to 1.11 g/sq cm. A second set of detectors near this location yielded doses of 6.48 to 2.66 Gy under Al equivalent shielding of 0.48 to 15.4 g/sq cm. On the leading edge, doses of 2.58 to 2.10 Gy were found under Al equivalent shielding of 1.37 to 2.90 g/sq cm. Initial charged particle LET (linear energy transfer) spectra, fluxes, doses and dose equivalents, for LET in H2O greater than or = 8 keV/micron, were measured with plastic nuclear track detectors (PNTDs) located in two experiments. Also preliminary data on low energy neutrons were obtained from detectors containing (6)LiF foils.

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