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首页> 外文期刊>Medical Physics >Energy dependence of effective atomic numbers for photon energy absorption and photon interaction: studies of some biological molecules in the energy range 1 keV-20 MeV.
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Energy dependence of effective atomic numbers for photon energy absorption and photon interaction: studies of some biological molecules in the energy range 1 keV-20 MeV.

机译：有效原子数对光子能量吸收和光子相互作用的能量依赖性：对能量范围为1 keV-20 MeV的一些生物分子的研究。

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摘要

Effective atomic numbers for photon energy absorption, Z(PEA,eff), and for photon interaction, Z(PI,eff), have been calculated by a direct method in the photon-energy region from 1 keV to 20 MeV for biological molecules, such as fatty acids (lauric, myristic, palmitic, stearic, oleic, linoleic, linolenic, arachidonic, and arachidic acids), nucleotide bases (adenine, guanine, cytosine, uracil, and thymine), and carbohydrates (glucose, sucrose, raffinose, and starch). The Z(PEA,eff) and Z(PI,eff) values have been found to change with energy and composition of the biological molecules. The energy dependence of the mass attenuation coefficient, Z(PEA,eff), and the mass energy-absorption coefficient, Z(PI,eff), is shown graphically and in tabular form. Significant differences of 17%-38% between Z(PI,eff) and Z(PEA,eff) occur in the energy region 5-100 keV. The reasons for these differences, and for using Z(PEA,eff) rather than Z(PI,eff) in calculations of the absorbed dose, are discussed.
机译：对于生物分子，已经通过直接方法在1 keV到20 MeV的光子能量范围内，通过直接方法计算了光子能量吸收的有效原子序数Z（PEA，eff）和光子相互作用的有效原子序数Z（PI，eff），如脂肪酸（月桂酸，肉豆蔻酸，棕榈酸，硬脂酸，油酸，亚油酸，亚麻酸，花生四烯酸和花生酸），核苷酸碱基（腺嘌呤，鸟嘌呤，胞嘧啶，尿嘧啶和胸腺嘧啶）和碳水化合物（葡萄糖，蔗糖，棉子糖，和淀粉）。已经发现Z（PEA，eff）和Z（PI，eff）值随生物分子的能量和组成而变化。质量衰减系数Z（PEA，eff）和质量能量吸收系数Z（PI，eff）的能量依赖性以图形和表格形式显示。 Z（PI，eff）和Z（PEA，eff）之间的显着差异为17％-38％，发生在5-100 keV的能量区域。讨论了这些差异的原因，以及在计算吸收剂量时使用Z（PEA，eff）而不是Z（PI，eff）的原因。

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