| 王美娇,姚凯宁,李莎,岳海振,刘卓伦,蒋璠,吴昊,王若曦.塑料闪烁体探测器在光子束和电子束中的性能研究[J].中华放射医学与防护杂志,2021,41(3):205-211 |
| 塑料闪烁体探测器在光子束和电子束中的性能研究 |
| The performance of plastic scintillator detector in photon and electron beam |
| 投稿时间：2020-03-02 |
| DOI：10.3760/cma.j.issn.0254-5098.2021.03.009 |
| 中文关键词: W2塑料闪烁体 切伦科夫校准因子 角度响应 放射治疗 |
| 英文关键词:W2 plastic scintillator Cerenkov light radiation correction factor Angular response Radiation therapy |
| 基金项目:国家重大研发计划（2019YFF0104405；北京市自然科学基金（1202009） |
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| 中文摘要: |
| 目的 探讨W2塑料闪烁体探测器在兆伏级光子束和电子束辐射中的性能。方法 采用直线加速器提供的光子束和电子束能量对W2闪烁体进行数据采集。研究内容包括静电计读数稳定性、W2剂量和剂量率线性以及角度响应，同时研究W2校准系数给剂量测量带来的不确定度。结果 静电计读数稳定性平均值的标准偏差在0.03~0.47之间；W2剂量的线性回归因子均为1.0；剂量率线性的最大偏差为0.61％；6和10 MV的切伦科夫校准因子（CLR）分别为0.741和0.746，6、9、12和15 MeV的CLR分别为0.750、0.753、0.757和0.757。照射能量为15 MeV时剂量不确定度最大，偏差为3.15%。结论 经双通道信号测量修正得到的信号不随角度变化而变化，即使是在高能电子束流下也成立。证实切伦科夫校准因子线性良好，该探测器可应用于立体定向放射治疗中的非共面射野剂量学测量。 |
| 英文摘要: |
| Objective To investigate the performance of W2 plastic scintillator in megavolt photon and electron beams. Methods The photon and electron beam energy provided by linear accelerator was used to collect data of the W2 scintillator. The parameters include the electrometer reading stability, W2 dose and dose rate linearity, and angular response. And the dose uncertainty of the W2 correction factors was also investigated. Results The standard deviation of the electrometer reading stability was between 0.03 and 0.47. The linear regression factors of W2 dose were all 1.0; the maximum deviation of the dose rates was 0.61%. The Cerenkov light radiation correction factor(CLR) for 6 and 10 MV were 0.741 and 0.746, respectively, and the CLR for 6, 9, 12 and 15 MeV were 0.750, 0.753, 0.757 and 0.757, respectively. The maximum deviation of dose uncertainty for 15 MeV was 3.15%. Conclusions The signal obtained by the blue and green channel was no angular dependence, the same as the high-energy electron beam, which verified that the Cerenkov radiation correction factor has good linearity. W2 plastic scintillator can be applied to non-coplanar radiotherapy dosimetry. |
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