Irradiation Treatment of Cultured Pearls
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摘要: 采用电子加速器对淡水和海水养殖珍珠进行辐照实验, 获得了大量的辐照改色样品。实验表明, 辐照产生的颜色是稳定的, 辐照后珍珠不具有残余放射性。淡水珍珠辐照改色的效果明显, 海水珍珠只能得到稍带银灰色的效果。为了探讨珍珠辐照改色的机理, 对天然的文石和方解石晶体也进行了辐照实验。通过系统对比辐照前、后珍珠的各种性质, 总结了辐照珍珠的鉴别特征, 讨论了辐照改色的机理。认为珍珠中的有机成分与水的放射化学反应及 Mn在辐照过程中的氧化作用是珍珠辐照改色的主要原因。Abstract: Irradiating experiments on freshwater and seawater cultured pearls using electron accelerator have been done, and lots of colour changed samples have been obtained in the experiments. In the irradiating experiments, different types of cultured pearls with different colours and different conditions are used in order to get various treated samples and ideal condition. The colour produced by irradiation is stable, and the treated pearls are free of residual radioactivity. Natural aragonite and calcite crystals have also been treated in irradiation in order to investigate the colouring mechanism. After systematically comparing the features before and after treatment, the identification features are concluded and the colour change mechanism is discussed. The authors think that the radioactivity chemical reaction of organic substance and water in irradiation will be responsible to the colour change together with the oxidization of manganese.
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Keywords:
- cultured pearl /
- irradiation /
- colour change
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