Alsaee Saleh K, Omar Ahmad Fairuz, Ahmed Naser M, Alsadig Ahmed, Sulieman A, Alzimami Khalid
School of Physics, Universiti Sains Malaysia, Penang, Malaysia.
Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Trieste, Italy.
Dose Response. 2019 Jun 16;17(2):1559325819855532. doi: 10.1177/1559325819855532. eCollection 2019 Apr-Jun.
The purpose of this study is to investigate the potentiality of Gafchromic external beam therapy 3 (EBT3) film to measure low dosage of solar ultraviolet (SUV; 0-10 600 mJ/cm) and x-ray (0-750 mGy) radiation. In this experiment, 2 groups of EBT3 films were prepared with size 2 cm × 1 cm. The first group of films was exposed by incremental SUV dose in the middle of the day. The other group was irradiated by x-ray at 100 kVp, 100 mA, and 2 S of tube voltage, tube current, and exposure time, respectively. The measured SUV consists of 90% ultraviolet A (UVA) and 10% ultraviolet B. The film discoloration was represented by visible absorbance spectroscopy technique using Jaz spectrometer from Ocean Optics Inc. Simple linear regression produced high accuracy with coefficients of determination, of 0.9804 and root mean square error (RMSE) of 434.88 mJ/cm for the measurement of SUV dose. On the other hand, of 0.98 and RMSE of 31 mGy was produced for the measurement of x-ray dose. The application of multiple linear regression enhanced the measurement accuracy with of 99% and 99.7% and RMSE of 327.06 mJ/cm and 15.045 mGy for SUV and x-ray dose, respectively. The spectral analysis shows a promising measurement at selected wavelengths for SUV and x-ray dose.
本研究的目的是探究放射变色外照射治疗3（EBT3）胶片测量低剂量太阳紫外线（SUV；0 - 10600 mJ/cm²）和X射线（0 - 750 mGy）辐射的潜力。在本实验中，制备了两组尺寸为2 cm×1 cm的EBT3胶片。第一组胶片在中午时分以递增的SUV剂量进行照射。另一组分别在管电压100 kVp、管电流100 mA和曝光时间2 s的条件下接受X射线照射。所测量的SUV由90%的紫外线A（UVA）和10%的紫外线B组成。使用海洋光学公司的Jaz光谱仪通过可见吸收光谱技术来呈现胶片的变色情况。简单线性回归在测量SUV剂量时产生了高精度，决定系数为0.9804，均方根误差（RMSE）为434.88 mJ/cm²。另一方面，在测量X射线剂量时，决定系数为0.98，均方根误差为31 mGy。多元线性回归的应用提高了测量精度，对于SUV和X射线剂量，决定系数分别为99%和99.7%，均方根误差分别为327.06 mJ/cm²和15.045 mGy。光谱分析表明在选定波长下对SUV和X射线剂量的测量前景良好。
