Faculty of Materials Science and Engineering Kyoto Institute of Technology Matsugasaki Sakyo, Kyoto 606-8585 Japan.
Master's Program of Innovative Materials Graduate School of Science and Technology Kyoto Institute of Technology Matsugasaki Sakyo, Kyoto 606-8585 Japan.
ChemistryOpen. 2020 May 27;9(5):623-627. doi: 10.1002/open.202000071. eCollection 2020 May.
The theoretical limit of the color-change sensitivity of a composite resin dosimeter film based on 6-nitro BIPS/BaFCl : Eu/polystyrene under X-ray exposure has been estimated. Each photophysical and photochemical process occurring inside the composite resin dosimeter was quantitatively determined, and the obtained values were used to estimate the theoretical limit of the color-change sensitivity for the composite resin dosimeter. The values obtained were 70.6 % for the X-ray absorption efficiency, 13 % for the fluorescence quantum yield, 73.5 % for the UV absorption efficiency and 37.6 % for the photochemical quantum yield. Assuming that the figure-of-merit is their product, its value is estimated to be 2.5 %, which contributes to the chromaticity difference and leads to a color-change sensitivity of 100 mGy. The figure-of-merit of a structurally optimized composite dosimeter was estimated to be 1.9 times that of the dosimeter without structural optimization, which showed a sensitivity of 100 mGy. We predicted that the structurally optimized composite resin dosimeter film, which eliminates optical losses due to the structure, will be able to detect X-ray exposure doses on the order of approximately 28 mGy.
已估算出基于 6-硝基 BIPS/BaFCl:Eu/聚苯乙烯的复合树脂剂量计膜在 X 射线照射下的颜色变化灵敏度的理论极限。定量确定了复合树脂剂量计内发生的每个光物理和光化学过程，并使用获得的值来估算复合树脂剂量计的颜色变化灵敏度的理论极限。获得的数值分别为 X 射线吸收效率的 70.6%、荧光量子产率的 13%、紫外吸收效率的 73.5%和光化学反应量子产率的 37.6%。假设品质因数是它们的乘积，其值估计为 2.5%，这有助于色差值并导致 100 mGy 的颜色变化灵敏度。结构优化后的复合剂量计的品质因数估计比没有结构优化的剂量计高 1.9 倍，其灵敏度为 100 mGy。我们预测，结构优化后的复合树脂剂量计膜将能够检测到大约 28 mGy 的 X 射线照射剂量，从而消除了结构引起的光损耗。
