Abstract The understanding of the electron trapping and recombination processes is the key to successful applications of materials in ionizing radiation dosimetry, which unfortunately are not well known yet. In this work, the influence of the photoionization cross-section ( σ ) was investigated on the optically stimulated luminescence (OSL) response of the lithium fluoride (LiF) compound. The σ has been predicted through the expression proposed by Lima–Batista–Couto. In addition, OSL measurements were performed using the continuous-wave stimulation mode (CW-OSL), with 60 s of light stimulation. The samples were submitted to 10 Gy and 15 Gy of absorbed dose. Phonon dispersion and density calculations are presented by using the Density Functional Perturbation Theory. The results, obtained by a combination of different methodologies, show that the low sensitivity of LiF to the light stimulus ( λ = 470 nm) is due to the very low magnitude of σ at the used excitation wavelength. A comparison with Al 2 O 3 :C was also carried out, showing that the intensity and the pattern of the OSL curve decay are modified by the σ . These results play an important role in understanding the luminescent properties of this material, and they open a new opportunity to improve the light sensitivity of this detector.

中文翻译：

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光电离截面对 LiF 的 OSL 信号的影响：一种理论和实验方法

摘要 对电子俘获和复合过程的理解是材料在电离辐射剂量学中成功应用的关键，不幸的是，这还不是众所周知的。在这项工作中，研究了光电离截面 (σ) 对氟化锂 (LiF) 化合物的光受激发光 (OSL) 响应的影响。已通过 Lima-Batista-Couto 提出的表达式预测了 σ。此外，OSL 测量是使用连续波刺激模式 (CW-OSL) 进行的，光刺激为 60 秒。样品接受 10 Gy 和 15 Gy 的吸收剂量。声子色散和密度计算是通过使用密度泛函微扰理论提出的。通过不同方法的组合获得的结果，表明 LiF 对光刺激（λ = 470 nm）的低灵敏度是由于所用激发波长的 σ 幅度非常低。还进行了与 Al 2 O 3 :C 的比较，表明 OSL 曲线衰减的强度和模式由 σ 修改。这些结果在理解这种材料的发光特性方面发挥着重要作用，它们为提高该探测器的光灵敏度开辟了新的机会。