密度提取中吸收系数的使用
Use of attenuation coefficient in density gaining
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摘要: 研究了能谱效应的影响，进行了理想的蒙特卡罗(MC)数值闪光照相。在密度提取中使用了3种不同的吸收系数——MC谱光子平均能量对应的单能质量吸收系数、波恩近似公式谱有效质量吸收系数和MC谱有效质量吸收系数。研究结果表明，使用MC谱有效质量吸收系数有效地减小了密度提取中能谱效应的影响。粗略的波恩谱使密度均方根误差小于1.5％，精确的MC谱则获得了均方根误差小于0.5％的理想结果。Abstract: In order to investigate the spectrum effect in density gaining, an ideal radiography has been simualted with Monte Carlo (MC) method. Three kinds of mass attenuation coefficient(MAC) have been used, which are the monoenergetic MAC at the mean energy of the MC simulated spetrum, the effective MAC of the Born approximation formula spectrum(BS) and the effective MAC of the MC simulated spectrum. The results show that if the spectrum effective MAC is used, the spectrum effect decreases obviously. The root-mean-square error of the density may be less then 1.5% with the effective MAC of the BS. Better result is gained with the effective MAC of the MC simulated spectrum.
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Key words:
- radiography /
- spectrum effect /
- density /
- mass attenuation coefficient
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