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Gaseous Detector Laboratory
Portable Gamma-Ray Spectrometer, Using Compressed Xenon
An ionization chamber using compressed xenon has been designed and built for gamma-ray spectrometry. The device is based on signal measurement from a parallel plate detector, with the gas enclosure constructed specifically for packaging into a portable instrument. It comprises two small containers that can be setup for operation in just a few minutes. Its sensitivity is 100 keV to over 1 MeV, with a resolution at 662 keV of 2.5% FWHM for uniform irradiation, and 2% FWHM for collimated irradiation, comparable to the best ever with compressed xenon. It also exhibits greater specificity than most scintillators, such as NaI. The device is insensitive to neutron damage and has a low power requirement.
A photo of the internal components of the ionization chamber:
A pulse height spectrum from the compressed xenon spectrometer:
Last Modified: Wednesday, 06-Feb-2013 22:33:56 EST