Dose distribution of secondary radiation in a water phantom for a proton pencil beam—EURADOS WG9 intercomparison exercise
Dose distribution of secondary radiation in a water phantom for a proton pencil beam—EURADOS WG9 intercomparison exercise
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质子笔形束水体模中二次辐射的剂量分布——EURADOS WG9 比对练习
DOI：
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发表时间：
2018
影响因子：
3.5
通讯作者：
P. Olko
中科院分区：
文献类型：
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作者：
L. Stolarczyk;S. Trinkl;M. Romero;N. Mojżeszek;I. Ambrožová;C. Domingo;M. Davídková;J. Farah;M. Kłodowska;Ž. Knežević;M. Liszka;M. Majer;S. Miljanić;O. Ploc;M. Schwarz;R. Harrison;P. Olko
使用一套热释光探测器(TLD)：MTS-7(7LiF：镁，钛)、MTS-N(NatLiF：镁，钛)和TLD-700(7LiF：镁，钛)，放射光致发光(RPL)探测器GD-352M和GD-302M，以及基于聚烯丙基二甘醇碳酸酯(C12H18O7)的径迹刻蚀探测器(C12H18O7)，系统地绘制了治疗用质子笔扫描束在300 × 300 × 600 mm~3水模中诱导的场外剂量图。在体模内的200个点上，实验测定了中子和伽马射线剂量，以及线性能量转移分布。并行地，应用Geant4蒙特卡罗程序计算每个探测器位置的中子和伽马辐射能谱。对于100 × 100 × 100 mm的立方质子靶体积(调制为100 mm展开布拉格峰)，在距靶中心100−mm处沿体模主轴方向的散射光子剂量约为0.5mGyGy1，在距靶心300 mm处约为0.02mGy−1。对于中子，相应的剂量当量值分别为~0.7mSv和~0.06mSv Gy−1。测量的中子剂量与20 mV X射线的类似实验中的场外中子剂量相当，而扫描质子束的光子剂量最多低三个数量级。
Systematic 3D mapping of out-of-field doses induced by a therapeutic proton pencil scanning beam in a 300 × 300 × 600 mm3 water phantom was performed using a set of thermoluminescence detectors (TLDs): MTS-7 (7LiF:Mg,Ti), MTS-6 (6LiF:Mg,Ti), MTS-N (natLiF:Mg,Ti) and TLD-700 (7LiF:Mg,Ti), radiophotoluminescent (RPL) detectors GD-352M and GD-302M, and polyallyldiglycol carbonate (PADC)-based (C12H18O7) track-etched detectors. Neutron and gamma-ray doses, as well as linear energy transfer distributions, were experimentally determined at 200 points within the phantom. In parallel, the Geant4 Monte Carlo code was applied to calculate neutron and gamma radiation spectra at the position of each detector. For the cubic proton target volume of 100 × 100 × 100 mm3 (spread out Bragg peak with a modulation of 100 mm) the scattered photon doses along the main axis of the phantom perpendicular to the primary beam were approximately 0.5 mGy Gy−1 at a distance of 100 mm and 0.02 mGy Gy−1 at 300 mm from the center of the target. For the neutrons, the corresponding values of dose equivalent were found to be ~0.7 and ~0.06 mSv Gy−1, respectively. The measured neutron doses were comparable with the out-of-field neutron doses from a similar experiment with 20 MV x-rays, whereas photon doses for the scanning proton beam were up to three orders of magnitude lower.
影响因子：
3.8
作者：
Zhu, X. R.;Poenisch, F.;Sahoo, N.
通讯作者：
Sahoo, N.