Comparison of CdTe and CdZnTe Detectors for Field Determination of Uranium Isotopic Enrichments Page: 4 of 16
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WSRC-MS-2002-00895
The major disadvantage of these room temperature semiconductor detectors is the
low radiation detection efficiency due to their small size. The selection of the best y-ray
or X-ray detector for a specific application is therefore a compromise between energy
resolution and detection efficiency. A comparison of various types of commercially
available radiation detectors for field applications has been reported 1. There continues to
be advancements in the CZT and CdTe semiconductor technologies to produce more
material with higher resistivities and decreased leakage currents. Additional
improvements have included the use of thermoelectric cooling with Peltier elements to
improve the energy resolution and stability of the detectors 2 and digital pulse processing
to reduce the hole trapping effects 3. This study compares the performance of two
commercially available instruments, one containing a CZT and the other a CdTe detector,
when exposed to uranium samples of varying isotopic content.
Experimental
The response of the two detectors was measured using various radionuclides with
y-ray and X-ray emissions following standard spectroscopic practices. Spectra were
recorded and analyzed using vendor-supplied firmware for data acquisition, multichannel
analyzers and software for analyzing the spectra. Energy, efficiency and peak shape
calibrations were determined using standard radioactive sources for each detector over
the energy range of 50-200 keV, the region of the spectrum where most of the radiations
from the uranium radioisotopes and their radioactive progeny occur. The detectors tested
in this study included a 3 mm x 3mm x 2 mm CZT detector with a 0.025 mm Be entrance
window and a 5 mm x 5 mm x 1 mm CdTe detector with a 0.010 mm Be entrance
window.3
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Hofstetter, KJ. Comparison of CdTe and CdZnTe Detectors for Field Determination of Uranium Isotopic Enrichments, article, January 23, 2004; South Carolina. (https://digital.library.unt.edu/ark:/67531/metadc740159/m1/4/: accessed March 28, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.