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首页> 外文期刊>Radiation measurements >Measurement of photoneutron doses in and out of high-energy X-ray beam of a SATURNE-20 medical linear accelerator by ECE polycarbonate detectors
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Measurement of photoneutron doses in and out of high-energy X-ray beam of a SATURNE-20 medical linear accelerator by ECE polycarbonate detectors

机译：通过ECE聚碳酸酯探测器测量SATURNE-20医用线性加速器的高能X射线束中进出的光中子剂量

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摘要

Photoneutron contaminations in and out of high energy X-ray beams of the medical linear accelerator SATURNE 20 (CGR) of the Radiotherapy Department of Omeed Hospital in Isfahan, Iran, have been determined using 250 mu m polycarbonate (PC) dosimeters, in strips or in sheets, processed by electrochemical etching (ECE) using specially designed ECE chambers to etch larger sheets. A two dimensional or topographical distribution of neutron contamination was also determined in a full size beam. The neutron dose equivalents (Hn) in the beam of 18 MV X-rays at 80 cm FSD were determined to be linear functions of Xray dose equivalents (Hx) up to 1400 cSv. The distribution of the Hn at different X-ray doses showed bell-shape profiles with maxima at the isocenter. The ratios of dose equivalents of neutrons to those of X-rays increased as the field size increased having values of 0.22%, 0.28%, 0.31% and 0.37% for field sizes of 10x10, 20x20, 30x30, and 40x40 cm(2) respectively. Although such neutron dose equivalents can be corrected for patient treatment, it can cause radiation protection problems for workers where the design of the facility is not well planned. [References: 13]
机译：伊朗伊斯法罕市奥美德医院放射治疗科的医用线性加速器SATURNE 20（CGR）的高能X射线束中的光中子污染已通过250毫米聚碳酸酯（PC）剂量计（带状或线状）确定。通过专门设计的ECE腔室，通过电化学蚀刻（ECE）处理薄片，以蚀刻较大的薄片。还确定了全尺寸束中的中子污染的二维或地形分布。确定在80 cm FSD的18 MV X射线束中的中子剂量当量（Hn）是X射线剂量当量（Hx）高达1400 cSv的线性函数。 Hn在不同X射线剂量下的分布呈钟形，最大等轴点位于等中心。随着视野尺寸的增加，中子与X射线的剂量当量之比增加，对于10x10、20x20、30x30和40x40 cm（2）的视野尺寸分别为0.22％，0.28％，0.31％和0.37％ 。尽管可以校正这种中子剂量当量以进行患者治疗，但如果设施设计不当，可能会给工作人员带来辐射防护问题。 [参考：13]

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