用正电子湮没技术研究黄玉的辐照变色机理

通过对天然无色黄玉、快中子辐照变色黄玉、高能电子辐照变色黄玉以及辐照变色黄玉退火过程的正电子湮没寿命谱的对比分析研究，结果表明：中子、电子辐照均不同程度地在黄玉中产生了相当数量的缺陷。从而造成黄玉的变色，而辐照变色黄玉高温退火后．相当数量的缺陷消失．从而导致改色后黄玉的退色。在此基础度上对黄玉的呈色机理作了探讨．并对黄玉的改色工艺作了大胆的预测。

Study on colorific mechanism of topaz after irradiated by positron annihilation technique

In this paper lots of positron annihilation lifetime spectra are analysed, which contain Nature topaz,color-changed topaz irradiated by neutron or electron and colorless ,color-changed topaz during the annealing. The result shows that lots of defects are induced by radiation of neutron and electron in different degree, which cause color changed to topaz. A large number of defects in colored topaz disappear after colored topaz was annealed, which cause colored topaz colorless . Based on the experiments , the colorific mechanism is also discussed. After that , the color-changed techniques is forecast fearlessly.