与镅的操作量有关的屏蔽计算
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- 英文论文题名：The shielding calculation considering the different amount of Americium
- 论文作者：李雪峰 ; 王振宏
- 英文论文作者：LI Xue-feng ; WANG Zhen-hong ; China Nuclear Power Engineering Co. ; Ltd. ; Zhengzhou Branch
- 年：2015
- 作者机构：中国核电工程有限公司郑州分公司;
- 论文关键词：屏蔽层厚度 ; 屏蔽计算 ; 镅
- 英文论文关键词：shielding thickness ; shielding calculation ; Americium
- 会议召开时间：2015-09-21
- 会议录名称：中国核科学技术进展报告（第四卷）——中国核学会2015年学术年会论文集第5册（核材料分卷、辐射防护分卷）
- 语种：中文
- 分类号：TL328
- 学会代码：EGVD
- 会议名称：中国核学会2015年学术年会
- 会议地点：中国四川绵阳
- 主办单位：中国核学会
- 学会名称：中国核学会
- 页数：5
- 文件大小：301k
- 原文格式：O
- 会议级别：全国
摘要
对于含有~(241)Pu的经过长期存放的含钚物料,随着钚产品贮存时间的延长,由~(241)Pu衰变生成的~(241)Am的量也在逐年增加,~(241)Am在α衰变的同时,放射出60 keV的γ射线和平均能量为17 keV的X射线,钚的产品在贮存2年后,~(241)Am就使钚产品的外照辐射强度增加一倍,严重影响到操作钚的安全。本文在计算过程中,将放射性物料做点源考虑,屏蔽体内表面距点源5 cm,探测点距屏蔽体外表面30 cm。针对于不同操作量的镅,分别采用MCNP4C程序计算和经验公式计算两种方法进行了屏蔽计算,并将两种计算结果进行了对比分析,得出了将一定操作量的~(241)Am在一定距离处的剂量率降低到5μSv/h以下时,所需要的屏蔽层的厚度和材质。
After long-term conservation of plutoniuni material containing ~(241)Pu,the amount of ~(241)Am which decays from ~(241)Pu is incresing.Because of the alpha decay from ~(241)m,gamma rays of 60 keV and X rays of average energy 17 keV are emitting.After 2 years conservation,the radiation intensity of plutoniuni product is double because of ~(241)Am,which affects the safety of plutoniuni operation.In the calculation of the paper,considering the radioactive material as a point,the distance between inner shielding and the point source is 5 cm,the distance between outer shielding and the point source is 30 cm.For the americium in different weights,adopting MCNP4C and experience formula,comparing these two results,concluding the applicable sheilding thickness and material quality.
After long-term conservation of plutoniuni material containing ~(241)Pu,the amount of ~(241)Am which decays from ~(241)Pu is incresing.Because of the alpha decay from ~(241)m,gamma rays of 60 keV and X rays of average energy 17 keV are emitting.After 2 years conservation,the radiation intensity of plutoniuni product is double because of ~(241)Am,which affects the safety of plutoniuni operation.In the calculation of the paper,considering the radioactive material as a point,the distance between inner shielding and the point source is 5 cm,the distance between outer shielding and the point source is 30 cm.For the americium in different weights,adopting MCNP4C and experience formula,comparing these two results,concluding the applicable sheilding thickness and material quality.
引文
[1]李德平,潘自强.辐射防护手册第一分册:辐射源与屏蔽[M].北京:原子能出版社,1987.
[2]王俊峰等.钚冶金工艺学[M].北京:原子能出版社,2013.
[3]GB 18871-2002,电离辐射防护与辐射源安全基本标准[S].
[4]GBZ/T 144-2002,用于光子外照射放射防护的剂量转换系数[S].
[2]王俊峰等.钚冶金工艺学[M].北京:原子能出版社,2013.
[3]GB 18871-2002,电离辐射防护与辐射源安全基本标准[S].
[4]GBZ/T 144-2002,用于光子外照射放射防护的剂量转换系数[S].