辐射防护 ›› 2021, Vol. 41 ›› Issue (1): 17-26.

• 剂量学基础 • 上一篇    下一篇

基于ICRP 141号报告的241Am吸入后滞留份额计算及新旧模型异同

陈倩兰, 骆志平, 刘森林   

  1. 中国原子能科学研究院, 北京 102413
  • 收稿日期:2020-08-17 出版日期:2021-01-20 发布日期:2021-03-15
  • 作者简介:陈倩兰(1987—),女,2010年毕业于西南科技大学辐射防护专业,2018年6月毕业于中国原子能科学研究院辐射防护专业,获硕士学位,现为中国原子能科学研究院辐射防护专业博士研究生,注册核安全工程师。E-mail:chenqianlan2011@163.com

The calculation of the content per intake of 241Am based on ICRPPublication No. 141 and comparison of the new and old models’ results

CHEN Qianlan, LUO Zhiping, LIU Senlin   

  1. China Institute of Atomic Energy,Beijing 102413
  • Received:2020-08-17 Online:2021-01-20 Published:2021-03-15

摘要: 采用Matlab Simulink建立一个基于ICRP 141号报告的超铀核素生物动力学模型(简称新模型)的滞留份额计算程序,用此程序计算了工作参考人(平均呼吸道速率1.2 m3/h)吸入AMAD 5 μm的镅气溶胶后的滞留份额,并对ICRP新旧模型进行了比较。新模型滞留份额计算结果表明:(1)不同镅吸收入血类型、不同AMAD粒径对肺、骨骼、肝脏滞留份额影响显著,内照射评价前需重点确认这两项源项参数;(2)S类镅气溶胶吸入后,1 000天以后主要滞留在肺部、骨骼;F类镅主要富集在骨骼、肝脏器官中;M类镅在早期肺部、骨骼、肝脏中滞留份额相当,因此对于不同吸收类型,内照射直接测量的重点应有所针对性。新旧模型的异同为:(1)对于肺部滞留份额,S类、M类镅气溶胶吸入后肺部滞留在短期(1 000天以内)接近,中长期(1 000天及以上)新模型的计算值显著高于(高数倍及更大)旧模型,长期滞留M类比S类的新旧模型差异更大;对F类镅从第一天开始新、旧模型计算的肺部滞留份额差异巨大。(2)对于骨骼、肝脏滞留份额,S镅气溶胶吸入后,中长期计算值新模型显著高于旧模型;短期计算值新、旧模型相近;对于M、F类镅,新模型计算的骨骼、肝脏滞留份额明显低于旧模型,且F类镅新旧模型差异比M类镅更显著。

关键词: ICRP 141号报告, 呼吸道模型, 滞留份额, 新旧模型

Abstract: The content per intake calculating program of the new transuranic elements' biokinetic model in ICRP Publication No.141 is established using Matlab Simulink software. Then program is used to calculate the content per intake of Am-241 inhaled by reference worker (breathing rate 1.2 m3/h, AMAD 5 μm), and the new model’s results are compared with the old models’ results. The new model’s retention indicates: (1) the factors of absorbing type and the AMAD size have big influence on calculation of content per intake in lung, skeleton, liver. It is necessary to make clear the two factors of the radiation source before internal dose evaluation; (2) Type S Am aerosol inhaled mainly remains in lungs, skeleton after 1 000 days; Type F Am aerosol inhaled is mainly absorbed in skeleton and liver; Type M Am aerosol inhaled distributes quite similar amount in lung, skeleton and liver in the early 300 d. Therefore the internal dose direct monitoring methods should be different for Type S, M and F Am inhaled. The comparing of the new and old biokinetic models indicates: (1)for the lung content per intake calculated, the short-term results (<1 000 days after inhalation) of Type S and M are similar for the two models, the results of the middle and long-term (≥1 000 days after inhalation) from the new model is much higher than that of the old model, and the difference of the two models’ predictions are more obvious for Type S than Type M of Am; for Type F the difference of the two models are very big at any day. (2) For skeleton and liver content per intake calculated, for the Type S Am inhaled, the middle and long-term results of the new model are quite higher than the old model’s, while the two models’ short-term predicts are similar. For Type M and Type F of Am,the skeleton (liver also the same) content per intake predicted by the new model is lower than the old model’s, and the models’ difference of Type F Am is more obvious than that of Type M Am.

Key words: ICRP 141 Publication, HATM, retention per intake, new and old models

中图分类号: 

  • R144.1