Journal
RADIATION MEASUREMENTS
Volume 142, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.radmeas.2021.106542
Keywords
Dosimeter; N-(Hydroxymethyl)acrylamide; Potassium chloride; Gel; Radiotherapy
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Funding
- Hashemite University [HU 5252014]
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The study showed that increasing the concentration of potassium chloride improved the dose sensitivity of the polymer gel dosimeter by 33%. The R2 values decreased 1.6% per degree Celsius with increasing scanning temperature at 6 Gy. The dosimeter was stable for 2-120 hours after irradiation and showed independence of dose-rate and photon beam energy within specific ranges.
In this study, polymer-gel dosimeters containing N-(Hydroxymethyl) acrylamide (NHMA) with different concentrations of potassium chloride (KCl) were developed and introduced for use in radiotherapy. The gels were irradiated with a megavolt X-ray photon beam up to 10 Gy using a medical linear accelerator. The irradiated NHMA_KCl dosimeters were evaluated by nuclear magnetic resonance (NMR), in terms of relaxation rate (R2). The results show that the dose sensitivity of polymer gel was improved by 33% when KCl concentration was increased from 0 to 1.9 wt%. The decrease in R2 values with increasing scanning temperature was 1.6% per ?C at 6 Gy. The dosimeter was found stable within a period of 2?120 h after irradiation and is independent of dose-rate in the range of 50?600 cGy/min and independent of photon beam energy between 6 and 15 MV within 7.5% overall uncertainty.
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