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首页> 外文期刊>Quantum Beam Science >Measurement of Neutron Dose Equivalent within and Outside of a LINAC Treatment Vault Using a Neutron Survey Meter
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Measurement of Neutron Dose Equivalent within and Outside of a LINAC Treatment Vault Using a Neutron Survey Meter

机译：使用中子测量仪测量LinaC治疗库内外的中子剂量等同物

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This work concerns neutron doses associated with the use of a Siemens Primus M5497 electron accelerator, which is operated in the photon mode at 15 MV. The conditions offer a situation within which a fraction of the bremsstrahlung emission energies exceed the photoneutron threshold. For different field sizes, an investigation has been made of neutron dose equivalent values at various measurement locations, including: (i) At the treatment table, at a source-surface distance of 100 cm; (ii) at the level of the floor directly adjacent to the treatment table; and (iii) in the control room and patient waiting area. The evaluated neutron dose equivalent was found to range from 0.0001 to 8.6 mSv/h, notably with the greatest value at the level of the floor directly adjacent to the treatment couch (8.6 mSv/h) exceeding the greatest value on the treatment table (5.5 mSv/h). Low values ranging from unobservable to between 0.0001 to 0.0002 mSv/h neutron dose were recorded around the control room and patient waiting area. For measurements on the floor, the study showed the dose equivalent to be greatest with the jaws closed. These data, most particularly concerning neutron distribution within the treatment room, are of great importance in making steps towards improving patient safety via the provision of protective measures.
机译：这项工作涉及使用Siemens Primus M5497电子促进剂的中子剂量，其在光子模式下以15mV在光子模式下操作。条件提供了一种情况，其中Bremsstrahlung发射能量的一部分超过了光动垂体阈值。对于不同的场尺寸，在各种测量位置处的中子剂量等效值进行了研究，包括：（i）在治疗台处，源表面距离为100厘米; （ii）在邻近治疗表的地板的水平上; （iii）在控制室和患者等候区。发现评估的中子剂量当量为0.0001至8.6msv / h，特别是在邻近治疗台（8.6msv / h）的地板水平上的最大值，超过治疗表上的最大值（5.5 msv / h）。在控制室和患者等候区围绕控制室和患者等候区记录了从不可接受到0.0001至0.0002 mSV / h中子剂量之间的低值。对于地板上的测量，该研究表明剂量相当于最伟大的钳口关闭。这些数据，最特别有关于治疗室内的中子分布，在通过提供保护措施来实现改善患者安全性的步骤具有重要意义。

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