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首页> 外文期刊>Radiation measurements >Neutron spectrometry and determination of neutron ambient dose equivalents in different LINAC radiotherapy rooms
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Neutron spectrometry and determination of neutron ambient dose equivalents in different LINAC radiotherapy rooms

机译：在不同的LINAC放射治疗室中进行中子光谱测定和中子环境剂量当量的确定

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摘要

A project has been set up to study the effect on a radiotherapy patient of the neutrons produced around the LINAC accelerator head by photonuclear reactions induced by photons above ～8 MeV. These neutrons may reach directly the patient, or they may interact with the surrounding materials until they become thermalised, scattering all over the treatment room and affecting the patient as well, contributing to peripheral dose. Spectrometry was performed with a calibrated and validated set of Bonner spheres at a point located at 50 cm from the isocenter, as well as at the place where a digital device for measuring neutrons, based on the upset of SRAM memories induced by thermal neutrons, is located inside the treatment room. Exposures have taken place in six LINAC accelerators with different energies (from 15 to 23 MV) with the aim of relating the spectrometer measurements with the readings of the digital device under various exposure and room geometry conditions. The final purpose of the project is to be able to relate, under any given treatment condition and room geometry, the readings of this digital device to patient neutron effective dose and peripheral dose in organs of interest. This would allow inferring the probability of developing second malignancies as a consequence of the treatment. Results indicate that unit neutron fluence spectra at 50 cm from the isocenter do not depend on accelerator characteristics, while spectra at the place of the digital device are strongly influenced by the treatment room geometry.
机译：已经建立了一个项目来研究由〜8 MeV以上的光子引起的光核反应对LINAC加速器头部周围产生的中子对放疗患者的影响。这些中子可能直接到达患者，或者它们可能与周围的物质发生相互作用，直到它们变热，然后散布在整个治疗室并影响患者，从而增加了外围剂量。在距等中心点50 cm处以及在基于热中子引起的SRAM存储器失调的数字测量中子的地方，使用一组经过校准和验证的Bonner球体进行光谱测定。位于治疗室内。六台具有不同能量（从15到23 MV）的LINAC加速器进行了曝光，目的是在各种曝光和房间几何条件下，将光谱仪的测量结果与数字设备的读数相关联。该项目的最终目的是能够在任何给定的治疗条件和房间几何形状下，将此数字设备的读数与患者中子的有效剂量和相关器官的外周剂量相关联。这将允许推断由于该治疗而发生第二恶性肿瘤的可能性。结果表明，距等中心点50 cm处的单位中子注量谱不取决于加速器特性，而数字设备位置的谱受到治疗室几何形状的强烈影响。

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