BDD-I: an electron and proton dosimeter on the global positioning system

Details BDD-I: an electron and proton dosimeter on the global positioning system BDD-I: an electron and proton dosimeter on the global positioning system

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992stin...9233526c&link_type=abstract

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Physics

Dosimeters, Electrons, Energetic Particles, Global Positioning System, Protons, Radiation Trapping, Silicon Radiation Detectors, Terrestrial Radiation, Energy Dissipation, Far Fields, Galactic Cosmic Rays, Magnetic Poles, Radiation Belts, Radiation Dosage

Scientific paper

The Burst Detection Dosimeter-1 (BDD-1) is a multipurpose silicon detector system that has flown on two spacecraft of the Global Positioning System (GPS) series. This instrument measures the radiation dose received by the GPS spacecraft, primarily from energetic electrons trapped in the Earth's radiation belt, but also from solar energetic particles and galactic cosmic rays outside the trapped radiation zone (when the spacecraft is near the Earth's magnetic poles), because the BDD-1 instrument is a sensitive monitor of the proton flux greater than 50 MeV. Absorbers, located in front of four separate silicon sensors, determine energy thresholds for measuring incident particle fluxes, and the magnitude of energy loss in each sensor provides an imperfect but useful separation between ions and electrons over a wide range of energies. This report describes the important mechanical and electronic features of this detector and includes relations for converting the observed counting rate in the detector to parameters representing the incident flux of charged particles. Combining the system geometry with measured calibrations provides a means of numerically evaluating these parameters. The report presents some sample data measured with BDD-1.

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