Research on Treatment Method of Electron Irradiated Blue Diamond
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摘要: 钻石辐照处理后的颜色受辐照源类型、辐照剂量、辐照温度、钻石类型等因素影响。采用束流能量、束流强度不同的电子加速器对43粒钻石进行辐照处理，分析辐照前后钻石的光谱学特征与实验结果的关系，发现：在束流能量为2 MeV、束流强度为10 mA的电子直线加速器下，10~12 MGy辐照即可使钻石着色；随着辐照剂量增加，颜色饱和度增加，明度下降；辐照结束后，部分G色级及以上色级的Ⅰa型天然钻石和2颗近无色Ⅱa型CVD合成钻石辐照为蓝色；辐照剂量率对钻石辐照处理结果影响不大；水循环冷却系统保证辐照中热量耗散适宜，40℃以内的辐照温度可保证辐照中钻石裂隙不发生延展；辐照后辐照蓝色钻石在415~478 nm间蓝光透过率明显高于其他颜色辐照钻石。Abstract: The colour of irradiated diamonds is affected by irradiation source, irradiation dose, irradiation temperature, type of diamond, etc.Electron irradiation experiments were taken under the condition of beam energy 2 MeV, and beam intensity 10 mA for analyzing the spectral characteristics of diamonds after irradiation.When the irradiation dose reached to 10-12 MeV, the colour of diamonds began to alter.As the irradiation dose increasing, the hue and saturation of induced blue and green enhanced, while the brightness of diamonds reduced.The parts of natural Ⅰa type diamonds classified as G or higher and colourless CVD synthetic diamonds turned blue.The rate of irradiation dose did not impact the results obviously.Water cooling system controlled the temperature of specimen holder under 40℃, which kept the cracks of diamonds well.After irradiation, irradiated blue diamonds have higher transmittance in the range of 415-478 nm than the other colour diamonds.
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Keywords:
- blue diamond /
- irradiation treatment /
- condition
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