Araki Fujio
Department of Radiological Technology, Faculty of Life Sciences, Kumamoto University, 4-24-1, Kuhonji, Kumamoto 862-0976, Japan.
Radiol Phys Technol. 2012 Jul;5(2):199-206. doi: 10.1007/s12194-012-0154-5. Epub 2012 Apr 22.
The purpose of this study was to calculate the replacement correction factor, P(repl) (the product P(gr)P(fl) in the AAPM's notation, or the product p(cav)p(dis) in the IAEA's notation), at a reference depth, d(ref), for cylindrical chamber cavities in clinical photon and electron beams by Monte Carlo simulation. P(repl) was calculated for cavities with a combination of various diameters and lengths. P(repl) values calculated in photon and electron beams were typically higher than those recommended by the TG-51 and TRS-398 dosimetry protocols. P(repl) values for a Farmer chamber cavity were higher by 0.3 to 0.2% and by 0.7 to 0.4%, respectively, than data of TG-51 and TRS-398, at photon energies of (60)Co to 18 MV. Similarly, the P(repl) values for electron beams were higher by 1.5 to 1.1% than data for both protocols, in a range of 6-18 MeV. The P(repl) values depended upon the cavity diameter and length, especially for lower electron energies. We found that P(repl) values of cylindrical chamber cavities for photon and electron beams were significantly different from those recommended by TG-51 and TRS-398.
本研究的目的是通过蒙特卡罗模拟计算临床光子和电子束中圆柱形电离室腔在参考深度d(ref)处的替换校正因子P(repl)（在AAPM表示法中为乘积P(gr)P(fl)，或在IAEA表示法中为乘积p(cav)p(dis)）。针对具有不同直径和长度组合的腔计算了P(repl)。在光子束和电子束中计算得到的P(repl)值通常高于TG-51和TRS-398剂量测定协议所推荐的值。在(60)Co至18 MV的光子能量下， Farmer电离室腔的P(repl)值分别比TG-51和TRS-398的数据高0.3%至0.2%和0.7%至0.4%。同样，在6-18 MeV范围内，电子束的P(repl)值比两个协议的数据高1.5%至1.1%。P(repl)值取决于腔的直径和长度，特别是对于较低的电子能量。我们发现，光子束和电子束中圆柱形电离室腔的P(repl)值与TG-51和TRS-3所推荐的值显著不同。 98
原文中“TRS-3所推荐的值显著不同。 98”这里疑似表述有误，已按原文翻译。
