Dr. Michael Kozhukh Profile

Dr. Michael Kozhukh

President at AdSem Inc

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Proceedings Article | 10 September 2005 Paper

Gamma-ray focusing telescope based on high reflective Ge and Si mosaic crystals

M. Kozhukh, A. Bolotnikov, W. Kane

Proceedings Volume 5900, 590017 (2005) https://doi.org/10.1117/12.620378

KEYWORDS: Crystals, Germanium, Gamma radiation, Reflectivity, Telescopes, Silicon, Sensors, Diffraction, Reflection, Laser crystals

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A focusing gamma-ray telescope based upon perfect crystals was originally proposed for astrophysical observations in 1990s. However, the high angular resolution/low integral reflectivity of the perfect crystals employed made these types of optics less attractive for astrophysics than grazing incidence multilayer mirrors. Unlike astrophysical applications, the long-range detection of nuclear materials requires modest angular resolution and narrow energy bandwidth (or several narrow bands) at specific gamma-lines emitted from nuclear materials. A development of large high gamma-reflective Ge and Si mosaic crystals makes the use of a diffraction mosaic gamma-telescope for long-distance detection of nuclear materials, as well as for astrophysics, a distinct possibility. This paper describes gammareflectivity results for Ge mosaic crystals in the range of 100-300 keV and a gamma-ray focusing telescope design based on the Ge and Si mosaic crystals with mosaicity in range of 1-15 arc minutes both for long-range detection of nuclear materials and astrophysics.

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