DTIC ADA124736: A Cryogenic Argon Ionization Chamber pdf

DTIC ADA124736: A Cryogenic Argon Ionization Chamber

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Two ionization chamber detectors, using liquid or solid argon as their medium were designed, constructed and tested as an improved means of analyzing quantitatively xenon 131m and xenon 133. Problems with the first detector, including vibrational noise and inadequate temperature control, limited its use to studies using solid argon. In the second design, many operating problems of the first detector were corrected. Properties of the detectors were studied using external gamma sources and xenon 131m dispersed inside the detector medium. The xenon sample and argon were purified and cryogenically pumped into the detector for spectral analysis. Both the purity of the argon and bias voltages affected resolution by changing the trapping distance of the electrons in the medium. Lower temperatures increased detection efficiency by condensing more of the sample into the cell. No clearly recognizable energy peak could be found in spectra from external or internal sources

• Creator/s: Defense Technical Information Center
• Book Topics/Themes: DTIC Archive, Berggren, Stephen Rolph, AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING, *XENON, *CHEMICAL ANALYSIS, *RADIOACTIVE ISOTOPES, *RADIATION MEASURING INSTRUMENTS, MEASUREMENT, QUANTITATIVE ANALYSIS, DETECTION, DETECTORS, RESOLUTION, EFFICIENCY, THESES, VOLTAGE, TRAPPING(CHARGED PARTICLES), IONIZATION CHAMBERS, IMPURITIES, RANGE(DISTANCE), ARGON, BIAS, SPECTRUM ANALYSIS, CRYOGENICS, CONDENSATION, FISSION PRODUCTS

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