Identification of Pearl Based on X-Ray Transmission Imaging and Fluorescence Dual Mode
SHAO Shang-kun1, 2, SUN Xue-peng1, 2, DU Xiao-guang3, LI Yu-fei1, 2, WANG Ya-bing1, 2, ZHANG Xiao-yun1, 2, LIU Zhi-guo1, 2, SUN Tian-xi1, 2*
1. Key Laboratory of Beam Technology of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
2. Beijing Radiation Center, Beijing 100875, China
3. Beijing Division, China Nuclear Power Technology Research Institute, Beijing 100086, China
Abstract：In order to solve the problems of conventional pearl identification methods, which require the testing personnel to have rich experience, sample pretreatment, sample destruction and long detection time, a dual-mode pearl detection system based on X-ray transmission imaging and fluorescence was designed. X-ray attenuation coefficient could be calculated by the introduction of a thickness measurement system on X-ray transmission imaging system. The attenuation coefficient of the material can be calculated, which makes samples with the same X-ray absorption, different thickness and similar attenuation coefficient can be distinguished, and the resolution of the imaging system can be improved. The thresholds database of attenuation coefficients was established by measuring a large number of samples. By comparing the attenuation coefficient with the threshold value, the identification between different imitation pearls, pearls and imitation pearls could be realized. The content of Ca in freshwater and seawater pearls with similar attenuation coefficients is much larger than that of Sr, and the content of Sr in freshwater and seawater pearls is different. The ratio of contents of Sr and Ca be used to distinguish between freshwater and seawater pearls. Therefore, X-ray fluorescence analysis system is introduced. The fluorescence intensity ratios of Sr and Ca in fresh water and seawater pearls were measured, and the threshold value of the fluorescence intensity ratio between freshwater and seawater pearls was calculated by a large number of sample measurements, and the identification of freshwater and seawater pearls was performed based on the comparison between the measured values and the threshold values. The X-ray transmission imaging system and the X-ray fluorescence system introduced into the thickness measurement system cooperate to form a dual-mode system for identifying pearls. The experimental results show that the dual-mode system can distinguish between different imitation pearls, pearls and imitation pearls, freshwater and seawater pearls without destroying the sample. The dual-mode detection system can be used for online many-sample inspection in conjunction with the sorting system and has potential applications in such fields like the analysis identification of jewelry, ore, and lithoid flooring.
Key words：X-ray fluorescence; X-ray attenuation coefficient; Pearl; Dual-mode system
邵尚坤，孙学鹏，杜晓光，李玉飞，王亚冰，张晓芸，刘志国，孙天希. 基于X射线透射成像及荧光双模式的珍珠检测[J]. 光谱学与光谱分析, 2020, 40(12): 3936-3940.
SHAO Shang-kun, SUN Xue-peng, DU Xiao-guang, LI Yu-fei, WANG Ya-bing, ZHANG Xiao-yun, LIU Zhi-guo, SUN Tian-xi. Identification of Pearl Based on X-Ray Transmission Imaging and Fluorescence Dual Mode. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2020, 40(12): 3936-3940.
[1] LI Hui, HAN Mo, ZHU Fei-ye, et al(李 辉, 韩 墨, 朱飞叶, 等). Chinese Journal of New Drugs(中国新药杂志), 2013, 22(23): 2817.
[2] GAN Yi-xuan, CUI Wen-yuan(甘怡绚, 崔文元). Acta Scientiarum Naturalium Universitatis Pekinensis(北京大学学报·自然科学版), 2002, 38(3): 400.
[3] ZHU Wen-kui, LIU Bin, MAO Wei-jun, et al(朱文魁, 刘 斌, 毛伟俊, 等). Tobacco Science and Technology(烟草科技), 2015, 48(2): 69.
[4] YANG Hui-gang, QIAO Zhi-min, GAO Hui-yan, et al(杨慧刚, 乔志敏, 高绘彦, 等). Industry and Mine Automation(工矿自动化), 2018, 44(8): 91.
[5] WANG Shao-gang, WANG Su-cheng, ZHANG Lei(王绍钢, 王苏程, 张 磊). Acta Metallurgica Sinica(金属学报), 2013, 49(8): 897.
[6] Nicolas Jaccard, Thomas W Rogers, Lewis D Griffin D. 2014 11th Ieee International Conference on Advanced Video and Signal Based Surveillance (Avss), 2014. 387.
[7] Sun Tianxi, Liu Zhiguo, Zhu Guanghua, et al. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2009, 604(3): 755.
[8] Sun Tianxi, Liu Zhiguo, Li Yude, et al. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2010, 622(1): 295.
[9] Scrivano S, Gomez-tubio B, Ortega-feliu I, et al. X-Ray Spectrom, 2013, 42(4): 251.
[10] Peng Song, Liu Zhiguo, Sun Tianxi, et al. Anal. Chem., 2014, 86(1): 362.
[11] Karydas A G, Kotzamani D, Bernard R, et al. Nucl Instrum Methods Phys Res Sect B-Beam Interact Mater Atoms, 2004, 226(1-2): 15.
[12] Luigi Germinario, Roberto Cossio, Lara Maritan, et al. Microsc Microanal, 2016, 22(3): 690.
[13] D’angelo J, Perino E, Marchevsky E, et al. X-Ray Spectrom, 2002, 31(6): 419.
[14] WANG Ju-an, YAN Xue-jun, FANG Biao(王巨安, 严雪俊, 方 飚). Journal of Gems and Gemmology(宝石和宝石学杂志), 2017, 19(S1): 42.
[15] QU Guo-pu, LING Qiu, GUO Lan-ying, et al(屈国普, 凌 球, 郭兰英, 等). Nuclear Electronics and Detection Technology(核电子学与核探测技术), 2005, 25(2): 124.
[16] Lu Jiwen, Hu Junlin, Zhou Xiuzhuang, et al. IEEE Transactions on Pattern Analysis and Machine Intelligence, 2014, 36(2): 331.
