基于螺吡喃分子光致变色性质的氚活度探测

Efficient detection of tritium radioactivity is important for the safe handling of tritium in military, energy sources, decommissioning of nuclear facilities etc. However, the traditional methods have some obvious shortcomings, such as weak adaptability to tritiated sample states, low detecting efficiency and generation of secondary tritiated waste.We propose a solution of detecting tritium radioactivity based on the principle of photochromic reaction in spiropyran derivative, which has been induced by photons coming from scintillator emission excited by beta ray.In present proposal, we will focuses on increasing the photosensitivity of spiropyran in solid state. Spiropyran molecules will be dispersed into the scintillator crystal lattice (or deposition onto the surface) through doping (or evaporating), by which high photosensitive spiropyran- scintillator complex is made. By employing this spiropyran-scintillator complex, an new method of tritium radioactivity detection with high sensitive and avoiding the sample preparation during measurements would be developed.

氚活度的高效探测对于军事、能源以及核设施退役等领域的涉氚安全具有重要意义。但是传统探测法存在对检测物形态适应性不强、探测效率低以及易产生二次氚污染废物等问题。申请人提出，基于螺吡喃衍生物高效吸收由β射线激发闪烁体产生的光子，发生光致变色反应的原理，探测氚活度。本项目致力于提高固态下螺吡喃分子的光敏感度，将通过掺杂（或蒸镀）的方式，使螺吡喃分散到闪烁体中（或蒸镀到闪烁体表面上），制成在固态下具有高光活性的螺吡喃/闪烁体复合物，用于氚活度探测。本项目的实施将有望建立一种高灵敏、免取样的氚活度探测新方法。

氚活度的高效探测对于军事、能源以及核设施退役等领域的涉氚安全具有重要意义。本项目基于螺吡喃衍生物高效吸收由β射线激发闪烁体产生的光子，发生光子致变色反应的原理，发展了一种不同于液体闪烁计数法、电离室等传统测量的探测氚活度方法。对含氚样品测试考核表明，三联苯/螺吡喃复核材料体系对含氚样品具有响应迅速、灵敏等特点，得到了响应信号—氚放射性浓度曲线。基于所取得的研究数据，表明已初步建立氚放射性浓度的探测新方法。