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By Philips Gary W., Nagel David J., Coffey Timothy

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Extra resources for Detection of Nuclear and Radiological Weapons

Example text

NaI detectors have a limited energy resolution of about 8% for the 662 keV gamma rays from 137Cs. Solid-state semiconductor detectors convert the gamma-ray energy directly to an electronic pulse that is then recorded by a PHA. 2%, or forty times better than NaI, and produce a high-resolution spectrum with sharp peaks rising above an underlying continuum. This superior resolution allows precise determination of the gamma-ray energy, separation of close-lying peaks, and identification of weak peaks in the presence of a strong interfering background.

Cadmium telluride (CdTe), cadmium zinc telluride (CZT) and mercuric iodide (HgI) semiconductor diode detectors are currently available commercially (table 12). For CZT, best efforts to date have produced detectors with about Figure 16. Calibration curves of peak detection efficiency versus gamma-ray energy for 32% relative efficiency coaxial Ge detectors [ORTEC, 2004]. The curve labeled GEM is for a standard p-type detector and GMX for an n-type detector with a thin Be window. 13 keV (2%) resolution at 662 keV.

5x2, 2x2, 3x3” Note a. berkeleynucleonics. 5, 2x2, 3x3” Note a. Other sizes available on request 1x1, 2x2, 3x3” Note a. Interfaces with portable analyzer. 5x2, 2x2, 3x3” Semirugged weather resistant assembly 3 x 14” overall/ 3 kg/ +12V at 20mA/$731 (2x2), $937 (3x3) Note a. 5 to 5” diameter Available with integrated photomultiplier and high voltage power supply Note a. 8 lb). 8 in. Typical weight: about 8 lb. Typical resolution: 7% at 662 keV, 5% at 1332 keV, typical cost < $1,000 including PM tube and base.

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Detection of Nuclear and Radiological Weapons by Philips Gary W., Nagel David J., Coffey Timothy

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