Technical note: the measurement of mammographic room protection.
Johnson, C H Walker, Anne
Johnson, C H
Walker, Anne
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Abstract
Owing to the inherent design of mammographic X-ray tubes, transmission measurements through the surrounding protective barriers are difficult to obtain using the primary beam. An alternative method has been developed which employs an iodine-125 source. Transmission measurements were obtained through common building materials using both the iodine-125 source and a mammographic X-ray beam generated at 35 kVp. Measurements were converted into an aluminium equivalence, from which correction factors were calculated to convert the aluminium equivalence determined using iodine-125 to the true aluminium equivalence. Average correction factors for samples of glass, chipboard and plasterboard were 1.10, 0.75, and 0.85, respectively.
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1994-05
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Technical note: the measurement of mammographic room protection. 1994, 67 (797):494-6 Br J Radiol