论文部分内容阅读
构建PuO_2颗粒状α发射体的球体几何模型,采用蒙特卡罗和射程经验公式模拟计算α射线在PuO_2颗粒中的射程能量关系式及α射线从PuO_2颗粒表面出射的能谱分布,研究因PuO_2颗粒对自发α射线的能量自吸收效应导致的对人体内照射剂量评估的影响。研究结果表明,PuO_2粒径越大,其对自发α射线的能量自吸收效应越明显,内照射剂量的修正效果越好;当PuO_2粒径在2μm以上时,内照射剂量的修正效果大于5%。本研究的结果对吸入放射性物质所致人体内照射剂量的准确估算有重要的参考价值,并可应用于放射性核素肿瘤治疗等领域的微剂量学研究。
The spherical geometry model of PuO_2 granular α-emitters was constructed. Monte Carlo and the empirical formula of the range were used to simulate the range energy distribution of α-rays in PuO_2 particles and the energy distribution of α-rays emitted from the surface of PuO_2 particles. Effects of spontaneous α-ray energy self-absorption on human radiation dose assessment. The results show that the larger the particle size of PuO_2, the more obvious its self-absorption effect on spontaneous α-rays, and the better the effect of internal dose correction. When the particle size of PuO_2 is above 2 μm, the correction effect of internal dose is more than 5% . The results of this study have important reference value for the accurate estimation of human radiation dose caused by inhalation of radioactive material and can be applied to the research of micro-dosimetry in the field of radionuclide tumor therapy.