Gamma ray line shapes from CdZnTe detectors
- Lawrence Livermore National Lab., CA (United States)
Gamma ray detectors made of cadmium zinc telluride, operating at ambient temperatures, are potentially useful for applications in safeguards technology, such as assay and isotopic analysis of nuclear materials in the field. We have studied the line shapes in the spectra of standard sources taken with a 5x5x5 mm CdZnTe detector. The peaks in the spectra were fit, after background subtraction, to the sum of a Gaussian and an exponential tall confined to the low energy side of the Gaussian. In the fits, there are five parameters in addition to the overall normalization: The peak energy and width of the Gaussian, the relative amplitude and the slope of the tail, and a cutoff parameter that makes the tail go smoothly to zero at the peak. We will present data showing the dependence of the parameters on gamma energy and compare these results to those characteristic of germanium detectors. We will also discuss the application of the shape parameters to the analysis of uranium spectra for the determination of enrichment.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 370675
- Report Number(s):
- CONF-960376--
- Country of Publication:
- United States
- Language:
- English
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