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首页> 外文期刊>Nuclear instruments and methods in physics research >Experimental determination of the absorbed dose to water in a scanned proton beam using a water calorimeter and an ionization chamber
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Experimental determination of the absorbed dose to water in a scanned proton beam using a water calorimeter and an ionization chamber

机译：使用量热计和电离室，通过实验确定扫描质子束中对水的吸收剂量

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摘要

The absorbed dose to water is the reference physical quantity for the energy absorbed in tissue when exposed to beams of ionizing radiation in radiotherapy. The SI unit of absorbed dose to water is the gray (Gy = 1 J/kg). Ionization chambers are used as the dosimeters of choice in the clinical environment because they show a high reproducibility and are easy to use. However, ionization chambers have to be calibrated in order to convert the measured electrical charge into absorbed dose to water. In addition, protocols require these conversion factors to be SI traceable to a primary standard of absorbed dose to water. We present experimental results where the ionization chamber used for the dosimetry for the scanned proton beam facility at PSI is compared with the direct determination of absorbed dose to water from the METAS primary standard water calorimeter. The agreement of 3.2% of the dose values measured by the two techniques are within their respective statistical uncertainties.
机译：当在放射治疗中暴露于电离辐射束时，吸收到水的剂量是组织吸收的能量的参考物理量。水吸收剂量的SI单位是灰色（Gy = 1 J / kg）。电离室用作临床环境中的剂量计，因为它们显示出很高的可重复性并且易于使用。但是，电离室必须进行校准，以便将测得的电荷转换成对水的吸收剂量。另外，协议要求这些转换因子必须可溯源至SI，以溯源至水吸收剂量的主要标准。我们介绍了实验结果，其中将用于PSI扫描质子束设施剂量测定的电离室与直接从METAS初级标准水热计确定的吸收剂量进行了比较。两种技术测得的剂量值的3.2％的一致性在各自的统计不确定性之内。

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