^(129)I人工嬗变实验中自膨胀密封靶制备技术研究  

Research on Self-expanding Sealed Target Preparation Technology in ^(129)I Artificial Transmutation Experiment

作　　者：李雪松[1] 欧阳晓平[1] 潘孝兵[1] 屠荆[1] 韦冠一[1] 

机构地区：[1]西北核技术研究所辐射探测研究中心,陕西西安710024

出　　处：《原子能科学技术》2013年第11期2142-2145,共4页Atomic Energy Science and Technology

基　　金：863计划资助项目(2009AA050705)

摘　　要：本文首次提出并实践了一种利用铝的热膨胀特性密封制备人工嬗变实验碘靶的技术。在西安脉冲反应堆上进行的129I人工嬗变实验要求靶的尺寸小、漏率低。将冷冻收缩的铝封堵头迅速置于室温下的铝靶壳顶部,待封堵头升温膨胀后自动对靶进行密封。该方法简洁易行,无高温焊接过程,不会改变靶芯的形态,制靶成本较低。同时,制靶材料在热分析时不会释放多余气体,耐温达600℃。采用6061铝经多次实验得到了自膨胀密封靶各部件匹配尺寸的经验公式。所制作的4个正式靶背压检漏漏率均好于5×10-9 Pa·m3/s,满足实验要求。The sealed target preparation technology based on A1 heat-expanding charac- teristic was proposed and performed firstly for iodine artificial transmutation experi- ment. The 129I transmutation experiment in Xi an Pulsed Reactor needed small target dimension and low leakage rate. After cooling enough time, the A1 sealing-head was quickly placed into the top of the A1 shell which was at room temperature. And the tar- get was sealed automatically when the sealing-head had expanded at room temperature. The method is easy to practice and there is no high temperature welding process in tar- get preparation, so the target core state shouldn＇t be changed, and it costs little. At the same time, the target meterial could release little unwanted gas in heating analysis and tolerate 600 ℃. The experience calculation formula was obtained for the matching dimensions of self-expanding sealing parts on several experiments with 6061 A1. The leakage rates of four real transmutation targets are lower than 5 X 10-9 Pa . m3/s in reverse-pressure leakage detection and can meet the requirement of transmutation experiment.

关 键 词：自膨胀 密封靶 碘 人工嬗变 

分 类 号：O571.34[理学—粒子物理与原子核物理]