Graduate Thesis Or Dissertation
 

The design and construction of an ionization chamber to measure background radiation

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  • An ionization chamber was constructed, using a fiberglass wall sphere, for the purpose of measuring background radiation. The system consists of the fiberglass wall chamber, 38.85 liters in volume, air filled, not sealed, used in conjunction with a precision capacitor, nulling voltage supply and electrometer. It was calibrated against a Shonka, 16.5 liter, muscle-equivalent, sealed ionization chamber in conjunction with a Shonka electrometer. Measurements made over a period extending from July 22 to July 29, 1968 in a second floor laboratory (X-ray Science and Engineering Laboratory, Oregon State University) with the fiberglass chamber yielded a mean dose rate of 7.96 ± 0.21 μ rads/hr. Measurements made over the same period with the Shonka system yielded a mean dose rate of 7.73 ± 0.07 μ rads/hr. The Shonka system was also used to measure background radiation as a function of time from December 14, 1967 to June 10, 1968. The mean value obtained over this period was 7.73 ± 0.10 μ rads/hr.
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