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

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


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 62Cu(T1/2: 9.7 min), 64Cu (T1/2: 12.7 h )  and 57Ni  (T1/2:  35.6 h) and a  peak at ≈ 1780 keV that could be attributed 28Al and 214Bi radioisotope. Ambient photon dose rates post radiotherapy treatment ranged 660 µGyh-1at o.5 m to 41 µGyh-1at 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 30th 2020


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