The distribution of leakage radiation from an unshielded diagnostic-type x-ray tube housing Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/5x21tk019

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  • The objective of this study was to determine the distribution of leakage radiation from two unshielded diagnostic-type X-ray tube housings. This information was used to determine the shielding required in the housings to bring them into compliance with the definition of a diagnostic-type protective tube housing, as set forth by the National Council on Radiation Protection and Measurements in Report No. 33. Two special diagnostic X-ray tube units were used, one containing a rotating anode tube and the other a stationary anode tube. The only shielding supplied was that provided by the steel, oil-containing tube casing which surrounds the X-ray tube. A measurement of the distribution of leakage radiation on a sphere of one meter radius about the focal spot of the X-ray tube was made on each tube when the tube was operated at its maximum rated continuous current for its maximum rated operating voltage. From the leakage radiation measured, the thickness of lead shielding required to bring the X-ray tube housing into compliance with the definition of a diagnostic-type protective tube housing was calculated. Lead shielding was placed on each of the X-ray tube housings, and measurements were made to determine if each housing was then in compliance with the definition of a diagnostic-type protective tube housing. As a result of this study, it was found that the distribution of leakage radiation from an unshielded diagnostic-type tube housing is non-uniform. The amount and location of shielding required in the housing is dependent upon the distribution of the leakage radiation, and is, therefore, a function of the design and rating of the X-ray tube used in the housing.
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