同步辐射X射线荧光光谱在宝石测试中的应用——以阿拉善玛瑙为例  

Application of Synchrotron Radiation X-ray Fluorescence Spectroscopy in Gem Test:Take Agate from Alashan as Example

作　　者：张龙博 林碧菡 张倩[1] ZHANG Longbo;LIN Bihan;ZHANG Qian(Gemmological Institute,China University of Geosciences,Wuhan 430074,China)

机构地区：[1]中国地质大学珠宝学院,湖北武汉430074

出　　处：《宝石和宝石学杂志》2020年第5期23-30,共8页Journal of Gems & Gemmology

基　　金：中央高校基本科研业务费专项资金项目(CUGL170218);中国地质大学(武汉)珠宝检测技术创新中心项目,文章编号CIGTWZ-2020014。

摘　　要：同步辐射X射线荧光光谱相比于普通X射线荧光光谱具有辐射强度高、高准直性、采谱时间短、光束截面小等特点。使用同步辐射X射线荧光光谱能够方便地对宝石样品进行面扫描和线扫描测试分析。采用同步辐射X射线荧光光谱测试了4个阿拉善玛瑙样品,根据玛瑙样品特点,对其中2个玛瑙样品进行了面扫描,2个玛瑙样品进行了线扫描,得到了其元素分布图,反映了玛瑙样品中杂质矿物以及不同颜色区域元素种类及含量的差异。实验结果表明,玛瑙样品中红色杂质矿物及黄色体色均与Fe元素有关,其中部分玛瑙样品中红色杂质矿物通过拉曼光谱仪测试结果为赤铁矿,黄色可能由细小的针铁矿所致。Synchrotron radiation X-ray fluorescence spectroscopy is an analytical method used to obtain the composition of material.Compared with the ordinary X-ray fluorescence spectrum,the synchrotron radiation X-ray fluorescence spectrum has the advantages of high radiation intensity,high straightness,short spectrum acquisition time,and small light spot.Synchrotron radiation X-ray fluorescence can be used to analyze gemstone samples by mapping or line scanning conveniently.In this paper,four agate samples from Alashan were tested by synchrotron radiation X-ray fluorescence to introduce the advantage of this technique.According to the characteristics of the samples,two samples were tested by mapping and two samples were tested by line scanning.The element distribution graph of agate samples was obtained by mapping or line scanning,which reflected the difference of the element relative content in different colour areas.The result shows that the red mineral and yellow colour in agate are related to Fe,in this area,the relative content of Fe is much higher than other area.Raman spectrometer were used to determine the red mineral in sample CM-2,which shows that the red mineral are hematite.The yellow colour of the agate may be caused by fine goethite combined with previous studies.

关 键 词：同步辐射X射线荧光光谱 应用 玛瑙 

分 类 号：TS93[轻工技术与工程]