A Simple Method to Determine Linear Attenuation Coefficients of Some Metal Materials Using 9MeV Industrial CT System
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摘要: 在考虑选择射线源能量、计算射线源的穿透能力或研究材料屏蔽性能时，被检测材料的线衰减系数是一个重要参数。本文基于9 MeV工业CT系统，提出一种简单的线衰减系数测定方法，对CT检测工作中常见的铝（Al）、钨（W）和钢（Fe）材料进行线衰减系数的测定。首先，选取不同厚度的金属材料，分别放置于探测器与射线源之间，使中心射束垂直透过金属材料；然后分别读取不同厚度金属材料下探测器通道的示数，通过线性拟合计算出被检测材料的线衰减系数；最后将测定结果与文献和NIST数据库中的结果进行比较。结果表明，通过实验测定的三种材料的线衰减系数比较准确，实验结果可用于相同材料的CT检测中，也可采用本文方法计算其他材料的线衰减系数。Abstract: X-ray linear attenuation coefficients have applications in choosing X-ray source, evaluating X-ray source penetration capability, investigating shielding performance of materials, etc.This work has been done to measure linear attenuation coefficients for Aluminum, Tungsten and Iron.Samples of different materials and different thicknesses were positioned between the X-ray source and the detector array and the central beam passed through the samples perpendicularly.The greyscale values of three channels in the detector array were read out with different materials and different thicknesses.The linear attenuation coefficients were calculated by plotting the log of the transmitted intensity against the varying in thickness.Compared with the results in NIST and another reference the linear attenuation coefficients obtained indicate that there is a good agreement between the experimental results and the results offered by the references.The proposed method can be adopted as an alternative method to measure the linear attenuation coefficients of materials.
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Keywords:
- industrial CT /
- linear attenuation coefficients /
- 9MeV /
- metal materials
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期刊类型引用(6)
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