Silicon Diodes as an Alternative to Diamond Detectors for Depth Dose Curves and Profile Measurements of Photon and Electron Radiation
Silicon Diodes as an Alternative to Diamond Detectors for Depth Dose Curves and Profile Measurements of Photon and Electron Radiation
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硅二极管作为金刚石探测器的替代品，用于光子和电子辐射的深度剂量曲线和轮廓测量
DOI：
10.1007/s00066-009-2004-x
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发表时间：
2009
影响因子：
3.1
通讯作者：
U. Ramm
中科院分区：
文献类型：
--
作者：
C. Scherf;Christiane Peter;Jussi Moog;J. Licher;E. Kara;K. Zink;C. Rödel;U. Ramm
背景资料：深度剂量曲线和横向剂量分布应对应于任何测量点的相对剂量，不同的探测器或多或少可以满足这一点。作为探测器材料的金刚石具有与水相似的剂量学特性。硅二极管和电离室也常用于获取剂量分布。材料和方法：作者比较了MP3水体模中测量的6 MV和25 MV光子的剂量分布，该水体模配有金刚石探测器60003、未屏蔽和屏蔽硅二极管60008和60012以及0.125 cm 3套管室233642（PTW，弗赖堡，格尔-许多）。用金刚石探测器、无屏蔽二极管和Markus电离室23343测量了6、12和18 MeV的电子束。结果：与金刚石探测器的测量数据相比，无屏蔽二极管测量的6-MV和25-MV光子在水面的相对剂量差异分别小于+ 10%和+ 4%。在水深的第一毫米内，这些值下降到不到1%。由于低能散射光子的重要贡献，屏蔽二极管只需要获得大于10× 10 cm 2的光子束的衰减区的正确数据。对于电子辐射，在积聚区内6 MeV的未屏蔽硅二极管中观察到的最大相对剂量差异为-2%。空间分辨率总是最好的小体积的硅diodes.Conclusion：相对剂量分布得到的两个硅二极管具有相同程度的准确性与金刚石探测器。
Background: Depth dose curves and lateral dose profiles should correspond to relative dose to water in any measured point, what can be more or less satisfied with different detectors. Diamond as detector material has similar dosimetric properties like water. Silicon diodes and ionization chambers are also commonly used to acquire dose profiles. Material and Methods: The authors compared dose profiles measured in an MP3 water phantom with a diamond detector 60003, unshielded and shielded silicon diodes 60008 and 60012 and a 0.125‑cm3 thimble chamber 233642 (PTW, Freiburg, Ger‑many) for 6‑and 25‑MV photons. Electron beams of 6, 12 and 18 MeV were investigated with the diamond detector, the unshielded diode and a Markus chamber 23343.Results: The unshielded diode revealed relative dose differences at the water surface below+ 10% for 6‑MV and+ 4% for 25‑MV photons compared to the diamond data. These values decreased to less than 1% within the first millimeters of water depth. The shielded diode was only required to obtain correct data of the fall‑off zones for photon beams larger than 10× 10 cm2 because of important contributions of low‑energy scattered photons. For electron radiation the largest relative dose difference of–2% was observed with the unshielded silicon diode for 6 MeV within the build‑up zone. Spatial resolutions were always best with the small voluminous silicon diodes.Conclusion: Relative dose profiles obtained with the two silicon diodes have the same degree of accuracy as with the diamond detector.