Radioluminescence yield of alpha particles in air
Radioluminescence yield of alpha particles in air
复制标题
空气中α粒子的辐射发光产率
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
Juha Toivonen
中科院分区：
文献类型：
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作者：
J. Sand;S. Ihantola;K. Peräjärvi;H. Toivonen;Juha Toivonen
α粒子可以通过测量它们在空气中被吸收时所产生的放射发光来检测。光是由氮分子受次级电子激发而在近紫外区发射的。辐射发光产率的准确知识对于利用这种二次效应的新型辐射探测应用至关重要。本文首次研究了α粒子的辐射发光产率作为空气中能量损失的函数。此外，粒子的总放射发光产率是用精心校准的239 ？实验中使用的> Pu发射极。得到的结果一致表明，α粒子产生19±3 ？在常压下(温度22°？在0.3 MeV ~ 5.1 MeV的能量范围内，两者之间的关系呈线性关系。测定的α粒子的辐射发光产率比以前报道的要高，与相当能量下电子的辐射发光产率相似。这进一步证明了带电粒子引起的发光主要与介质中的能量损失成正比，而对初级粒子的类型不太敏感。
Alpha particles can be detected by measuring the radioluminescence light which they induce when absorbed in air. The light is emitted in the near ultraviolet region by nitrogen molecules excited by secondary electrons. The accurate knowledge of the radioluminescence yield is of utmost importance for novel radiation detection applications utilizing this secondary effect. Here, the radioluminescence yield of an alpha particle is investigated as a function of energy loss in air for the first time. Also, the total radioluminescence yield of the particle is measured with a carefully calibrated 239 ?> Pu emitter used in the experiments. The obtained results consistently indicate that alpha particles generate 19 ± 3 ?> photons per one MeV of energy released in air at normal pressure (temperature 22 ° ?> C, relative humidity 43%) and the dependence is found to be linear in the studied energy range from 0.3 MeV to 5.1 MeV. The determined radioluminescence yield is higher than previously reported for alpha particles and similar to the radioluminescence yield of electrons at comparable energies. This strengthens the evidence that the luminescence induced by charged particles is mostly proportional to the energy loss in the media and not very sensitive to the type of primary particle.