Application of imaging plate technique for separate detection of 3H and 14C
Application of imaging plate technique for separate detection of 3H and 14C
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DOI：
10.1016/j.fusengdes.2005.08.080
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发表时间：
2006-02
影响因子：
1.7
通讯作者：
K. Sugiyama;T. Tanabe;T. Saze;K. Nishizawa
中科院分区：
文献类型：
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作者：
K. Sugiyama;T. Tanabe;T. Saze;K. Nishizawa
一种使用14c（一种β衰变放射性同位素）的示踪技术正在计划中，以了解核聚变装置中的碳迁移行为。成像板（IP）是一种成功应用于等离子体壁氚分析的辐射图像探测器，它可以很容易地检测到14c中的β-电子，并给出详细的14c沉积剖面，因此IP方法可以作为14c沉积的死后测量方法之一。然而，由于氚的β-电子会叠加14c的β-电子，因此区分14c的β-电子和氚的β-电子是必要的。为了做到这一点，我们开发了一种薄膜插入技术，在样品和IP之间插入薄膜，以阻止低能量电子通过薄膜。发现可以检测到低至10Bq/cm2（~ 2.6×101214C/cm2）的14c浓度，这表明该技术保持了14c作为高灵敏度示踪剂的优势，并且可以在不受共存氚干扰的情况下进行二维14c谱分析。
A tracer technique using14C, which is a β-decaying radioactive isotope, is being planed to understand the carbon migration behavior in fusion devices. An imaging plate (IP), which is a radiation image detector successfully applied for the tritium analysis of plasma-facing walls, easily detects β-electrons from14C and would give a detailed14C deposition profiles, hence the IP method can be one of the postmortem measurements of the14C deposition. However, since β-electrons from tritium would superpose those from14C, it is essential to differentiate β-electrons of14C from those of tritium. To do this, we have developed a film insertion technique in which a thin film is inserted between a specimen and IP to prohibit lower energy electrons passing through the film. It is found that14C concentrations as small as 10Bq/cm2(∼2.6×101214C/cm2) can be detected, indicating that this technique keeps the advantage of14C as a high sensitivity tracer, and making two-dimensional14C profiling possible without any disturbance of co-existing tritium.