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Many homeland security applications involving gamma-ray detectors require energy resolution of better than 1%-2% for isotope identification. Existing High-Purity germanium (HPGe) detectors have the needed energy resolution but suffer from large size and the need for liquid-nitrogen or electromechanical cooling. Compact, inexpensive, room-temperature-operated devices are needed for handheld monitors,...
Tetragonal prismatic HgI2 crystals are obtained from growth with low Mw polyethylene. Thermal desorption studies coupled with gas chromatography/mass spectroscopy (TDGC/MS) reveal the existence of normal alkanes and ketones in the growth ampoules with low molecular weight polyethylene. Polar bonds, such as carbonyl bonds found in ketones, may form weak bonds with Hg ions in the {220} faces, thus inhibiting...
CdZnTe crystals equipped with Frisch collars are studied at the Semiconductor Materials and Radiological Technologies Laboratory (S.M.A.R.T. Lab) at Kansas State University for use as room-temperature, high-resolution, semiconductor gamma-ray detectors. Obtaining plots of Relative Pulse Height vs. Input Photon Energy by testing with monoenergetic radioactive sources yields widely-spaced data points,...
In this study, the impact of crystal length on CdZnTe Frisch collar detector spectroscopic performance is investigated. Four different Frisch collar devices were designed to have identical aspect ratios of 2.0 for simulation purposes, and all four devices were later fabricated and tested. Pulse height spectra were acquired from all Frisch collar devices with a 137Cs gamma-ray check source and the...
The spectral performance as a function of the dielectric layer thickness for several CdZnTe Frisch collar devices was investigated. Seven different planar bar shaped detectors were fabricated from Redlen Technologies CdZnTe, and many Frisch collar devices were prepared from each planar device. The optimum dielectric layer thickness was experimentally determined for each device. The result of the optimal...
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