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KMID : 0362919880060020263
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Journal of the Korean Society for Therapeutic Radiology and Oncology
1988 Volume.6 No. 2 p.263 ~ p.268
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(A Study on Dose Distribution around Fletcher-Suit Colpostat Containing 137Cs Source
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Kang Wee-Saing
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Abstract
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This paper presents dose distributions in water around Fletcher-Suit colpostat containing 137Cs tube, and shielding effect of internal lead shield. Using ready packed film, author measured dose distribution in water around the colpostat containing cesium source.
Nine sheets of films on one side of the colpostat are packed with acryl frames cut out so as to fill water, and irradiated in water by cesium source in the colpostat. Dose distributions on transverse plane and upper plane 0.5 cm from upper surface of the colpostat were measured. Shielding effect was greater in upper medial direction than in lower medial direction. And that was the greatest around 30° from the axis of the colpostat on upper side and around 50° on lower side.
In the region 7 cm from the center of the colpostat, shielding efficiency was 0.23 to 0.35 on the lower 50° and 0.26 to 0.42 on the upper 30°, and decreased with increase of distance.
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KEYWORD
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Dose distribution, Fletcher-Suit colpostat, 137Cs source
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