Instrumentation for Space Radiation Measurements Part I

Abstract

An instrument designed to measure fluxes and energy distributions of protons in the range 10 to 100 Mev is discussed, together with related electronics. The instrument consists of a collimation housing containing two cesium iodide crystals and a plastic scintillator anti-coincidence ring. The electronics requires coincidence between the two CsI crystals and anti- coincidence with the plastic ring. The light from the large CsI crystal and the plastic anti-coincidence ring around it is sensed with a single photomultiplier tube and separated electronically by a phoswich circuit potted in the container with the tube. The coincidence, anti-coincidence output from the larger of the two CsI crystals is pulse-height analyzed by a 16 channel analyzer with binary coded output. Single count rates from each crystal are also telemetered by logarithmic count rate meters. The entrance port of the instrument contains a pair of magnets situated to minimize the count rate in the front CsI crystal from an electron flux. An instrument designed to measure electron fluxes and energy distributions in the energy range 50 to 1000 kev is also discussed. This instrument consists of a phototube and plastic scintillator housed in a collimated shield. The output is pulse-height analyzed by a sixteen-channelmore » analyzer similar to the one used with the proton instrument. (auth)« less