Spurný F, Pachnerová Brabcová K, Ploc O, Ambrožová I, Mrázová Z
Department of Radiation Dosimetry, Nuclear Physics Institute, Czech Academy of Sciences, Na Truhlářce 39/64, 18086 Praha 8, Czech Republic.
Radiat Prot Dosimetry. 2011 Feb;143(2-4):519-22. doi: 10.1093/rpd/ncq532. Epub 2011 Jan 18.
Active mobile dosimetry unit (Liulin), passive plastic nuclear track detectors (PNTD) and thermoluminescent detectors (TLD) were exposed in a C290 MeV/n beam at HIMAC-BIO (NIRS, Japan). Two different types of beam configuration were used--monoenergetic beam (MONO) and spread-out Bragg peak (SOBP); the detectors were placed at several depths from the entrance up to the depths behind the Bragg peak. Relative response of TLDs in beams has been studied as a function of the depth, and it was re-proved that it can depend on the linear energy transfer (LET). Liulin measures energy deposition in Si; the spectra of energy deposited in Si can be transformed to the spectra of lineal energy or LET. PNTDs are able to determine the LET of registered particles directly. The limitation of both methods is in the range in which they can determine the LET-Liulin is able to measure perpendicularly incident charged particles up to ∼35 keV/µm (in water), PNTD can measure from ∼7 to 400 keV/µm, independently of the registration angle. The results from both methods are compared and combined for both beams' configuration, and a good agreement is observed.
主动式移动剂量测定装置（柳林）、被动式塑料核径迹探测器（PNTD）和热释光探测器（TLD）在日本国立放射医学综合研究所（NIRS）的HIMAC - BIO的C290 MeV/n束流中进行了照射。使用了两种不同类型的束流配置——单能束流（MONO）和扩展布拉格峰（SOBP）；探测器放置在从束流入口到布拉格峰后方不同深度处。研究了TLD在束流中的相对响应随深度的变化情况，再次证明其可能取决于线能量转移（LET）。柳林测量硅中的能量沉积；硅中沉积能量的谱可以转换为线能量或LET的谱。PNTD能够直接确定所记录粒子的LET。这两种方法的局限性在于它们能够确定LET的范围——柳林能够测量垂直入射的带电粒子，最高可达约35 keV/µm（在水中），PNTD可以测量从约7到400 keV/µm，与记录角度无关。对两种束流配置下两种方法的结果进行了比较和合并，观察到了良好的一致性。
