基于γ射线辐照-光漂白效应的光纤大剂量核辐射探测

High energy ray and particles detection technology plays important role in the use of nuclear resource for human. Based on the radiation induced attenuation (RIA), fiber dosmetry has its great advantage in real-time, remote and accurate detection of nuclear radiation, but its low radiation dose saturation characteristics hindered the further development and application of optical fiber measurement. This project is based on the previous irradiation of fiber and the heat - photo bleaching effect, we plan to be thorough, comprehensive study of adiation sensitivity of the optical fiber, the preparation of high radiation sensitive optical fiber, optical bleaching effect and explore online detection and recovery of irradiated fiber , new fiber materials and nuclear radiation detection research defect formation and photobleaching recovery empirical model to solve the problem of high sensitivity optical fiber from the material composition and preparation process, from photobleaching effect to solve the contradiction of high fiber and low in saturated radiation-sensitive, and the development of a new ways to meet future application of nuclear radiation exploration. Implementation of this project will contribute to basic materials research and explore new ways to detect nuclear detection fiber optic technology, the development of new areas of optical fiber sensing plays an important role in human resources, nuclear safety applications.

核探测技术在人类安全利用核资源中发挥重要作用，基于光纤的辐致损耗 (RIA)和光纤自身凸显的优势，在实时、远程、安全核辐射探测应用中有其巨大潜力，但目前其辐照剂量易饱和特性阻碍了光纤探测的进一步发展和应用。本项目在我们前期掺杂光纤辐照特性和热、光漂白效应的研究基础上，拟进一步深入研究光纤辐照-光漂白-缺陷恢复效应及其微观机理，建立缺陷形成和漂白恢复经验模型，解决传感光纤的低剂量辐照饱和问题，并尝试用于大剂量γ射线辐射探测。本项目旨在发展光纤核探测技术的新原理和新方法，以满足将来全光结构、远程、实时的核辐射探测应用，其意义将有助于发展光纤核探测新技术，有助于促进核探测和光子学技术的交叉融合，实现源头创新，支持我国发展和安全利用核资源。

光纤应用在各种辐照环境中，如太空、核电站、高能检测仪器等辐照环境中，光纤的辐照特性研究是抗辐照和辐照测试与传感的技术基础。项目基于改进的化学气相沉积工艺制备光纤预制棒的原理及光纤拉丝工艺，研究了γ射线辐照对掺镱光纤激光器输出特性的影响。搭建了脉冲掺镱光纤放大器，通过对比不同辐照剂量及不同掺杂组分光纤输出特性演化趋势，发现辐致准静态模式退化效应；采用793 nm光漂白抑制辐致准静态模式退化效应，通过改进实验平台实现对同一辐照光纤光漂白过程中输出性能演化的表征；对比研究了传统掺Er光纤和新型Er3+/Ce3+/P5+/Al3+共掺石英基光纤和在辐照中的损耗和增益性能，测试了光漂白和热漂白，表明Er3+/Ce3+/P5+/Al3+共掺石英基光纤有效地提高EDF的抗辐射性能，使掺铒光纤在辐照环境中稳定运行。