Department of Physics, Imam Khomeini International University, Qazvin, 3414896818, Iran.
Biomed Phys Eng Express. 2024 Sep 3;10(5). doi: 10.1088/2057-1976/ad7032.
This study aims to evaluate the optical response dependence of the PAKAG polymer gel dosimeter on photon energy and dose rate. The produced gel dosimeters were irradiated using a Varian CL 21EX medical linear accelerator with delivered doses of 0, 2, 4, 6, 8, and 10 Gy. To examine the response dependence on the delivered dose rate, dose rates of 50, 100, 200, and 350 cGy minwere investigated. Additionally, two incident beam qualities of 6 and 18 MV were examined to study the response dependence on the incident beam energy. The irradiated polymer gel dosimeters were readout using a UV-vis spectrophotometer in the 300 to 800 nm scan range. The results reveal that a wide variation in dose rate (50-350 cGy.min) influences the absorbance-dose response and the sensitivity of PAKAG gel. However, smaller variations did not show a significant effect on the response. Furthermore, the response changed insignificantly with beam quality for investigated energies. It was concluded that the optical reading response of the PAKAG polymer gel dosimeter is satisfactorily independent of external parameters, including dose rate and incident beam quality.
本研究旨在评估 PAKAG 聚合物凝胶剂量计对光子能量和剂量率的光学响应依赖性。使用瓦里安 CL 21EX 医用线性加速器辐照所制得的凝胶剂量计，剂量分别为 0、2、4、6、8 和 10 Gy。为了研究对所施加剂量率的响应依赖性，研究了 50、100、200 和 350 cGy min 的剂量率。此外，还研究了两种入射束能量（6 和 18 MV），以研究对入射束能量的响应依赖性。用 UV-vis 分光光度计在 300 到 800nm 的扫描范围内读取辐照后的聚合物凝胶剂量计。结果表明，剂量率（50-350 cGy.min）的广泛变化会影响 PAKAG 凝胶的吸光度-剂量响应和灵敏度。然而，较小的变化对响应没有显著影响。此外，对于所研究的能量，响应随射线质量的变化不大。结论是，PAKAG 聚合物凝胶剂量计的光学读数响应在很大程度上不受包括剂量率和入射束质量在内的外部参数的影响。
