外推法
蒙特卡罗方法
电离室
光子
电离
计算物理学
物理
曲面(拓扑)
核医学
光学
材料科学
数学
医学
统计
几何学
离子
量子力学
作者
E Parsai,Diana Shvydka,D.W. Pearson,Mahesh Gopalakrishnan,John J. Feldmeier
标识
DOI:10.1016/j.apradiso.2008.02.089
摘要
The standard clinical approach of dose measurement using a Farmer type fixed plane parallel cylindrical ionization chamber produces erroneous results in the build-up region. We studied dose distribution in this region using a Monte Carlo simulation technique and compared our results with data measured using extrapolation, parallel plate, and cylindrical farmer type ionization chambers for 6 and 10 MV photon beams from two different accelerators. The extrapolation chamber data agreed favorably with the Monte Carlo results, suggesting that dose at the skin surface and a few mm beneath is significantly lower than conventionally accepted values.
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