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首页> 外文期刊>Journal of the Korean Physical Society >Activation of 45-MeV Proton Irradiation and Proton-induced Neutron Irradiation in Polymers
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Activation of 45-MeV Proton Irradiation and Proton-induced Neutron Irradiation in Polymers

机译：聚合物中45 MeV质子辐照的活化和质子诱导的中子辐照

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摘要

During beam irradiation experiments with more than a few MeV energetic protons, the sample activation problem can be very severe because it causes many kinds of additional problems for the post-processing of the samples, such as time loss, inconvenience of sample handling, personal radiation safety, etc. The most serious problem is that immediate treatment of the sample is impossible in some experiments, such as nano-particle synthesizing. To solve these problems, we studied why the samples are activated and how the level of the activation can be reduced. It; is known that the main reasons of activation are nuclear reactions with elements of the target material by primary protons and secondary produced neutrons. Even though the irradiation conditions are smile, the level of the activation can be different depending on the target materials. For the nano-particle synthesizing experiments, the target materials can be defined as the container and the sample itself. The reduction of the activation from the container is easier than the reduction from the sample. Therefore, we tried to reduce the activation level by changing the container materials. In this paper, the results are displayed for some candidate container materials, such as polymethyl methacrylate, polystyrene, Glass, etc.. with 45-MeV and 1.0-nA proton beams. As a result, PS is the most suitable material for the container because of its relatively low level of the activation by protons. Also the contribution of secondary produced neutrons to the activation is negligible.
机译：在使用多个MeV高能质子的束辐照实验期间，样品活化问题可能非常严重，因为它会导致样品后处理产生许多其他问题，例如时间损失，样品处理不便，个人辐射安全性等。最严重的问题是，在某些实验中，例如纳米粒子合成，不可能立即处理样品。为了解决这些问题，我们研究了为什么激活样品以及如何降低激活水平。它;已知活化的主要原因是由初级质子和次级产生的中子与靶物质的元素发生核反应。即使照射条件是微笑的，活化程度也可以根据目标材料而不同。对于纳米粒子合成实验，可以将目标材料定义为容器和样品本身。减少容器中的活化比减少样品中的活化容易。因此，我们试图通过更换容器材料来降低激活水平。在本文中，将显示某些候选容器材料的结果，例如具有45MeV和1.0nA质子束的聚甲基丙烯酸甲酯，聚苯乙烯，玻璃等。结果，由于PS的质子活化程度较低，因此PS是最适合容器的材料。次级产生的中子对活化的贡献也可以忽略不计。

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