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首页> 美国卫生研究院文献>Journal of Applied Clinical Medical Physics >Diamond detector in absorbed dose measurements in high‐energy linear accelerator photon and electron beams
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Diamond detector in absorbed dose measurements in high‐energy linear accelerator photon and electron beams

机译：金刚石探测器用于高能线性加速器光子和电子束吸收剂量的测量

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Diamond detectors (DD) are preferred in small field dosimetry of radiation beams because of small dose profile penumbras, better spatial resolution, and tissue‐equivalent properties. We investigated a commercially available ‘microdiamond’ detector in realizing absorbed dose from first principles. A microdiamond detector, type TM 60019 with tandem electrometer is used to measure absorbed doses in water, nylon, and PMMA phantoms. With sensitive volume 0.004 mm3, radius 1.1 mm, thickness 1 × 10−3mm, the nominal response is 1 nC/Gy. It is assumed that the diamond detector could collect total electric charge (nC) developed during irradiation at 0 V bias. We found that dose rate effect is less than 0.7% for changing dose rate by 500 MU/min. The reproducibility in obtaining readings with diamond detector is found to be ±0.17% (1 SD) (n = 11). The measured absorbed doses for 6 MV and 15 MV photons arrived at using mass energy absorption coefficients and stopping power ratios compared well with Nd, water calibrated ion chamber measured absorbed doses within 3% in water, PMMA, and nylon media. The calibration factor obtained for diamond detector confirmed response variation is due to sensitivity due to difference in manufacturing process. For electron beams, we had to apply ratio of electron densities of water to carbon. Our results qualify diamond dosimeter as a transfer standard, based on long‐term stability and reproducibility. Based on micro‐dimensions, we recommend these detectors for pretreatment dose verifications in small field irradiations like stereotactic treatments with image guidance.PACS number(s): 87.56.Da
机译：钻石探测器（DD）在辐射束的小剂量领域中是首选，因为其剂量分布半影较小，空间分辨率更好，并且具有等效的组织特性。我们研究了市售的“微金刚石”检测器，以从第一原理中了解吸收剂量。带有串联静电计的TM 60019型微型金刚石检测器用于测量水，尼龙和PMMA体模中的吸收剂量。敏感体积为0.004 mm 3 ，半径1.1 mm，厚度为1×10 −3 mm，标称响应为1 nC / Gy。假定金刚石探测器可以收集在0 V偏压下照射过程中产生的总电荷（nC）。我们发现，以500 MU / min的速度改变剂量率时，剂量率效应小于0.7％。发现使用钻石探测器获得读数的可重复性为±0.17％（1 SD）（n = 11）。使用质量能量吸收系数和停止功率比，与Nd相比，可测得6 MV和15 MV光子的吸收剂量，水校准离子室在水，PMMA和尼龙介质中的吸收剂量在3％以内。为钻石检测器确定的校准系数确定的响应变化是由于制造工艺不同而引起的灵敏度差异。对于电子束，我们必须应用水与碳的电子密度比。基于长期的稳定性和可重复性，我们的结果使金刚石剂量计成为转移标准。基于微观尺寸，我们建议将这些检测器用于小范围照射中的预处理剂量验证，例如采用图像指导的立体定向治疗.PACS号：87.56.Da

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