B. Cetinoneri, Y. Atesal, R. Kroeger, G. Tepper, J. Losee, Charles W Hicks, Marc Rasmussen, Gabriel M. Rebeiz
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This paper presents a contactless, microwave-based gamma ray detector for detecting low-energy gamma ray photons. The detection is based on a microwave cavity perturbation method, and uses a reflection-type cavity resonator with a detector-grade CZT crystal. The reflected power from the cavity is measured and this monitors the changes in the photoconductivity of the CZT crystal in the presence of a gamma-ray. A gamma ray detection sensitivity of < 100 keV is achieved at room temperature. The proposed system can be used in homeland security or radioactive material characterization applications.
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