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低浓缩铀靶辐照后裂变核素产量的理论研究

ISSN号：1000-6931
期刊名称：《原子能科学技术》
时间：0
分类：TL32[核科学技术—核技术及应用]
作者机构：[1]四川大学原子核科学技术研究所辐射物理及技术教育部重点实验室,四川成都610065, [2]中国核动力研究设计院,四川成都610041, [3]中国工程物理研究院核物理与化学研究所,四川绵阳621900
相关基金：国家自然科学基金NSAF联合基金资助项目（U1330125）; 国家基础科学人才培养基金特殊学科点资助项目（J1210004）

作者：刘展祥[1], 张亮[2], 杨远友[1], 廖家莉[1], 李兴亮[3], 杨吉军[1], 刘水清[2], 蹇源[3], 罗顺忠[3], 刘宁[1]

关键词：低浓缩铀, 核素, 富集度, DRAGON, low-enriched uranium, nuclide, enrichment, DRAGON

中文摘要：

用低浓缩铀靶代替高浓缩铀靶辐照进行^99Mo、^131I等医用放射性核素生产是一个必然的趋势。本文利用输运计算程序DRAGON研究了靶件^235 U富集度、中子注量率、辐照时间对^99Mo、^131I、^90Sr、^95Zr、^239Pu等核素比活度变化的影响,以及不同^235 U富集度下裂变体系组成和总比活度的变化规律。计算结果表明,本文考察的10余种核素比活度的变化随辐照时间的不同而有所不同,其中^99Mo、^131I、^147 Nd和^133 Xe等核素的比活度可快速达到饱和,^89 Sr、^103 Ru、^95 Zr和^141 Ce等缓慢达到饱和,而^99Tc、^85 Kr和^90Sr、^239Pu在计算时间内达不到饱和,但所有核素的比活度随时间的变化趋势与靶件^235 U富集度无关;^99Mo、^131I、^90Sr、^95Zr等核素的比活度均随靶件^235 U富集度提高而增加,而^239Pu比活度则随着靶件富集度的减少而显著增加,提示改用低浓缩铀靶进行^99Mo、^131I等医用放射性核素生产时应特别关注^239 Pu带来的影响;核素比活度随中子注量率的增加而线性增加,且斜率基本相同;靶件辐照时间的改变不会明显影响裂变体系的组成,在低浓缩铀（^235 U含量≤20%）区域,靶件^235 U富集度对裂变体系的组成影响很小。

英文摘要：

The production of medical radionuclides such as ^99Mo and ^131 I with lowenriched uranium as irradiation target instead of high-enriched uranium is an irreversibletrend.In this paper,the lattice transport code DRAGON was used to analyze the yields of more than 10nuclides（including ^99Mo,^131 I,^90Sr,^95 Zr and ^239 Pu,etc.）with different^235 U enrichments,neutron fluence rates and irradiation time.And the composition and total specific activity of fission system were also studied.The results show that the specific activity of nuclides as a function of irradiation time is found to be different.Of which,the specific activity of ^99Mo,^131 I,^133 Xe and 147 Nd can saturate rapidly,the specific activity of ^89 Sr,^95Zr,^103 Ru and ^141 Ce saturates slowly,whereas the specific activity of ^85 Kr,^90 Sr,^99Tc and ^239 Pu can not saturate until 120 d.The specific activity of all nuclides as a function of irradiation time is unrelated to ^235 U enrichment,but the specific activity of the nuclides such as ^99Mo,^131 I,^90Sr and ^95 Zr is linear function of ^235 U enrichment.Specially,the specific activity of ^239 Pu increases with the decrease of ^235 U enrichment,and it implies that the effect of ^239 Pu should be paid more attention if the low-enriched uranium is used to product medical radionuclide such as ^99Mo and ^131 I.Additionally,it could be noted that the specific activity of nuclides increases linearly with neutron fluence rate,and the slopes of different nuclides which are same group are similar.However,the irradiation time and enrichment of ^235 U have no remarkable effect on the composition of fission system,especially in the region of low-enriched uranium（content of ^235 U≤20%）.