【摘要】 用EGSnrc蒙特卡罗程序计算能量为1MeV的电子和32P、90Y和131I放射性核素的刻度剂量点核,计算能量为0.2MeV、4MeV的电子和32P、90Y放射性核素均匀分布在质量为10 2 103g的水球体中的吸收分数,计算活度为1 MBq/cm3的32P、90Y、131I放射性核素以及15 keV、30 keV、100 keV单能光子均匀分布在水(肿瘤)球壳(0.22 r 0.66cm)时的径向剂量率分布,并与国内外其它计算结果相比较。结果可为放射性核素治疗剂量计算提供参考。更多还原

【Abstract】 Background: The dose point kernel and the absorbed fraction are essential in the absorbed dose calculation for radionuclide therapy.Purpose: To calculate the scaled dose point kernels for 1 MeV monoenergetic electrons and32P,90Y,131I radionuclides,the absorbed fractions for 0.2 MeV and 4 MeV monoenergetic electrons and 32P,90Y radionuclides which uniformly distributed in water spheres of various mass ranging from 10 2to 103g,and the radial distributions of absorbed dose rates for 32P,131I,90Y nuclides and 15 keV,30 keV,100 keV photons which uniformly distributed in a water(tumor) spherical shell(0.22 r 0.66 cm) with an activity of 1 MBq/cm3.Methods: EGSnrc Monte Carlo programs were used for simulation.Results: The calculation results were compared with those of other works.Conclusions: The results could give some help to absorbed dose calculations for radionuclide therapy.更多还原