26 October 2004 Mercuric iodide polycrystalline films on cylindrical substrates
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Abstract
Space-based gamma-ray spectrometers utilize active anticoincidence shielding to reduce the background caused by charged-particle interactions. Shielding improves the performance of gamma-ray spectrometers by reducing the effect of charged particle interactions which can not be distinguished from true gamma-ray interactions by the spectrometer. Active shields produce a blanking signal when a charged particle is detected, so that the signal from the spectrometer can be ignored during the spectrometer's charged-particle interaction. Anticoincidence shielding for space-born gamma-ray detectors requires a cylindrical-shell geometry and charged-particle sensitivity. To reduce the size, weight, and cost of the shielding we utilize a new direct-conversion charged-particle detector material, polycrystalline mercuric iodide. We present the results from planar film growth techniques for the particle-counting detection capabilities necessary for anti-coincidence shielding. We also show that films with similar detection properties were grown on curved substrates with the size and curvature needed to surround space-based spectrometer main detectors.
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Neal E. Hartsough, Jan S. Iwanczyk, Nathan Skinner, Larry A. Franks, Bradley E. Patt, Marek Szawlowski, "Mercuric iodide polycrystalline films on cylindrical substrates", Proc. SPIE 5541, Penetrating Radiation Systems and Applications VI, (26 October 2004); doi: 10.1117/12.566068; https://doi.org/10.1117/12.566068
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KEYWORDS
Sensors

Gamma radiation

Particles

Spectrometers

X-rays

Scintillators

Signal detection

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