深部治療用X線装置の線量測定に際するCone typeの影響について

概要

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In the X-ray dosimetry of X-ray depth therapy unit, cone type or distance of mersurement have been paid no attaintion. The experiments on the infulence of cone type in the X-ray dosimetry were made and the following results were obtained. 1) Out put dose increased in proportion to the field of cone. 2) Out put dose increased in proportion to the cone length. The phenomena mentioned in 1) and 2) were caused by that off focus X-ray was cut off by diaphragm of cone. 3) The increase of effective focus size caused by the contamination of off focus X-ray led the phenomena of inverse squers law to fail. Those results came to a conclusion as follows : In the X-ray dosimetry of X-ray depth therapy unit, the thimble chamber shuld be contacted with the front part of the cone.
公益社団法人日本放射線技術学会の論文
1961-05-25