Passively scattered proton beam entrance dosimetry with a plastic scintillation detector.
Passively scattered proton beam entrance dosimetry with a plastic scintillation detector.
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DOI：
10.1088/0031-9155/60/3/1185
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发表时间：
2015-02-07
影响因子：
3.5
通讯作者：
Beddar S
中科院分区：
文献类型：
--
作者：
Wootton L;Holmes C;Sahoo N;Beddar S
我们测试了塑料闪烁探测器(PSD)用于质子入射剂量测量的可行性。用BCF-12闪烁光纤制作的PSD测量了能量范围为140-250 MeV的被动散射质子束的绝对入射剂量，并测量了2个能量范围内展宽的布拉格峰(SOBP)，以量化电离猝灭对探测器响应的影响，并确定了质子束中切伦科夫辐射修正的必要性。通过测量横向光束分布并将结果与胶片测量的分布进行比较，评估了PSD的总体准确度和精密度。由于电离猝灭，PSD响应不足，在所研究的最高能量(250 MeV)下，信号损失约为7%，在所研究的最低能量(140 MeV)下，信号损失约为10%。对于给定的标称能量，改变SOBP宽度不会显著改变PSD的响应。切伦科夫辐射对PSD信号的贡献微乎其微，可以安全地忽略，而不会在测量剂量中引入超过1%的误差。用PSD和胶片测量的轮廓在探测器的不确定度范围内一致，表现出良好的相对准确性。尽管修正系数是解释电离猝灭所必需的，但修正的大小在很大的能量范围内变化很小；因此，PSD是质子入射剂量测定的实用探测器。
We tested the feasibility of using plastic scintillation detectors (PSDs) for proton entrance dosimetry. A PSD built with BCF-12 scintillating fiber was used to measure the absolute entrance dose of a passively scattered proton beam for energies ranging from 140 MeV to 250 MeV, and for a range of spread out Bragg peak (SOBP) widths at 2 energies, to quantify the effect of ionization quenching on the response of the detector and to determine the necessity of Cerenkov radiation correction in proton beams. The overall accuracy and precision of the PSD was evaluated by measuring lateral beam profiles and comparing the results with profiles measured using film. The PSD under-responded owing to ionization quenching, exhibiting approximately a 7% loss of signal at the highest energy studied (250 MeV) and a 10% loss of signal at the lowest energy studied (140 MeV). For a given nominal energy, varying the SOBP width did not significantly alter the response of the PSD. Cerenkov radiation contributed negligibly to the PSD signal and can be safely ignored without introducing more than 1% error in the measured dose. Profiles measured with the PSD and film agreed to within the uncertainty of the detector, demonstrating good relative accuracy. Although correction factors were necessary to account for ionization quenching, the magnitude of the correction varied minimally over a broad range of energies; PSDs therefore represent a practical detector for proton entrance dosimetry.
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影响因子：
3.5
作者：
Archambault, Louis;Polf, Jerimy C.;Beddar, Sam
通讯作者：
Beddar, Sam
DOI：
10.1016/s0168-583x(00)00237-8
发表时间：
2000-10-01
影响因子：
1.3
作者：
Torrisi, L
通讯作者：
Torrisi, L
影响因子：
3.5
作者：
Zhao, Li;Das, Indra J.
通讯作者：
Das, Indra J.
影响因子：
3.5
作者：
Glaser, Adam K.;Zhang, Rongxiao;Pogue, Brian W.
通讯作者：
Pogue, Brian W.
影响因子：
6.2
作者：
Sejpal, Samir;Komaki, Ritsuko;Cox, James D.
通讯作者：
Cox, James D.