The Spectral Measurement of Scattered Radiation From a Clinical Linear Accelerator Using a CZT Detector

Advances in Life Science and Technology Pub Date : 2020-11-01 DOI:10.7176/alst/83-05

F. Abolaban, Yazeed F. Alshehri, Basil A. Khayat, Turki M. Bafail, Saeed S. Alsebaeai, A. Alhawsawi, Mawya A. Khafaji, K. Alsafi, A. Hussain

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Abstract

The study of the induced radioactivity following radiotherapy with high energy X-rays from medical linear accelerator. Patient equivalent phantom made of Polymethyl methacrylate (PMMA) of 30x30x27 cm size irradiated with 15 MV X-rays from Versa HD medical linear accelerator form Elekta. Induced radioactive and ambient dose rates were measured at 0.25, 0.5 and 1 m from beam center using GR1® spectrometry with Cadmium Zinc Telluride (CZT) detectors having energy resolution less than 2%. Spectrum analysis was performed using MultiSpect software. The measured spectrum showed 511 keV annihilation photons possibly as a result of positron emitter of which most likely candidates are 62 Cu(T1/2: 9.7 min), 64 Cu (T1/2: 12.7 h ) and 57 Ni (T1/2: 35.6 h) and a peak at ≈ 1780 keV that could be attributed 28 Al and 214 Bi radioisotope. Ambient photon dose rates post radiotherapy treatment ranged 660 µGyh -1 at o.5 m to 41 µGyh -1 at 1 m. These values agree well with the results presented in the literature. Keywords: Radiotherapy; Activation Products; Gamma spectrometry; Occupational exposure; Medical Linear Accelerator. DOI: 10.7176/ALST/83-05 Publication date: November 30 th 2020

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应用CZT探测器对临床直线加速器散射辐射的光谱测量

医用直线加速器高能x射线放射治疗后诱导放射性的研究。患者等效幻影由30x30x27厘米大小的聚甲基丙烯酸甲酯(PMMA)制成，用Elekta公司Versa HD医用直线加速器的15 MV x射线照射。在距离光束中心0.25、0.5和1 m处，使用能量分辨率小于2%的碲化镉锌(CZT)探测器，采用GR1®光谱法测量诱导放射性剂量率和环境剂量率。使用MultiSpect软件进行光谱分析。测量光谱显示511个keV湮灭光子，可能是由于正电子发射器，其中最有可能的候选是62 Cu(T1/2: 9.7 min)， 64 Cu(T1/2: 12.7 h)和57 Ni (T1/2: 35.6 h)，峰值约为1780 keV，可归因于28 Al和214 Bi放射性同位素。放射治疗后的环境光子剂量率为0.5 m时660µGyh -1至1m时41µGyh -1。这些值与文献中提出的结果一致。关键词:放射治疗;激活产品;伽马能谱;职业暴露;医用直线加速器。DOI: 10.7176/ALST/83-05出版日期:2020年11月30日

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Advances in Life Science and Technology

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