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Characterization of a new ionization chamber in radiotherapy beams: Angular dependence and variation of response with distance

机译:放射治疗束中新电离室的特性:角度依赖性和响应随距离的变化

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摘要

A new double faced ionization chamber was constructed at the Calibration Laboratory of IPEN. It has different collecting electrode materials: aluminum and graphite. It was irradiated in standard radiotherapy beams ( 60Co and X-rays). The response variation with distance and the angular dependence of this ionization chamber were evaluated. It was verified that the chamber response follows the inverse square law within a maximum variation of 11.2% in relation to the reference value. For the angular dependence it showed good agreement with international standards.
机译:IPEN的校准实验室建造了一个新的双面电离室。它具有不同的集电极材料:铝和石墨。用标准放射治疗束(60Co和X射线)照射。评估了该电离室随距离的响应变化和角度依赖性。证实腔室响应遵循平方反比定律,相对于参考值最大变化为11.2%。对于角度依赖性,它显示出与国际标准的良好一致性。

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