Enhanced Sensitivity and Stability in Gelatin-Based Fricke gel Dosimeters:Impact of Benzoic Acid on Low-Dose Radiation Measurements  

作　　者：Seyed Amir Saeedi-Sini Sedigheh Sina Mohammad Hossein Sadeghi Ebrahim Farajzadeh 

机构地区：[1]Nuclear Engineering Department,School of Mechanical Engineering,Shiraz University,Shiraz,Iran [2]Radiation Research Center,School of Mechanical Engineering,Shiraz University,Shiraz,Iran [3]Secondary Standard Dosimetry Laboratory(SSDL),Pars Isotope Co.,Karaj,Iran

出　　处：《Instrumentation》2024年第3期23-29,共7页仪器仪表学报（英文版）

摘　　要：Fricke gel dosimetry is a critical technique for accurate radiation dose measurement, leveraging the radiation-induced oxidation of ferrous to ferric ions within a hydrogel matrix. This study aimed to advance the field by preparing and evaluating seventy-one Fricke gel dosimeter(FGD) samples with varying chemical compositions, focusing on the incorporation of benzoic acid. Two gelatin-based samples demonstrated superior sensitivity, particularly for low-dose measurements. Our findings indicated that the sample without benzoic acid exhibited a 1.75 times higher sensitivity compared to the sample containing benzoic acid, with lower limits of detection at 0.04 Gy and 0.1 Gy, respectively. Stability tests revealed temperature-dependent responses, with better performance observed under refrigerated conditions. Reproducibility was confirmed through consistent calibration curves across multiple trials. Additionally, the dosimeters' responses varied with different radiation types, underscoring the need for specific calibrations. The study concludes that while benzoic acid slightly reduces sensitivity, it provides consistent responses across various radiation energies, suggesting its potential as a beneficial additive in diverse clinical scenarios. This research contributes to the ongoing optimization of FGDs for precise radiation dose assessment.

关 键 词：chemical dosimeter freak dosimeter benzoic acid 

分 类 号：TL81[核科学技术—核技术及应用]