能量色散X射线散射实验平台研制及其在违禁品检测中的应用研究

Development of energy dispersive X-ray scatter experimental platform for the application of detecting contraband

研制了用于检测违禁品的能量色散X射线散射实验装置。利用NaCl作为标样对装置的可靠性、准确性、能量分辨率进行了验证,结果表明,该装置采集的NaCl能量色散X射线散射谱获得的NaCl晶格常数与PDF(Powder Diffraction File)卡片能较好符合,在15.82keV处衍射峰的能量分辨率达2.2%(FWHM)。用该装置对TNT和海洛因进行检测,结果显示不同物质的能量色散X射线散射谱具不同特征,分析表明,由该装置获得的TNT和海洛因的晶格常数与PDF卡片能较好符合,在探测角10o、12o时获得的TNT、海洛因的能量色散谱图中衍射峰数目较多,强度较强,更宜进行TNT、海洛因识别。由此,利用该装置对违禁品检测是可行的。

We have developed an energy dispersive X-ray scatter experimental platform for detecting contraband. NaCl has been used as a standard sample to verify the accuracy, reliability and energy resolution of the equipment. The lattice constants of NaCl calculated from the energy dispersive curves obtained by the equipment are in accord with the standard X-ray diffraction data-PDF （Powder Diffraction File） issued by the International Centre for Diffraction Data. The equipment demonstrates a high energy resolution, where the primary peak of NaCl at 15.82 keV has a resolution of 0.348 keV （FWHM）. The equipment was also used to detect common explosive （TNT） and common drug （heroin）, where the characteristic energy dispersive patterns of the two kinds of materials have been acquired at different detecting angles. Among all the measured detecting angles, more diffraction peaks and higher intensities in those peaks are demonstrated at detecting angles of 10° and 12°. The results indicate that these two detecting angle are possibly more suitable for detecting TNT and heroin.