Track formation in nuclear emulsion plates for cosmic-ray imaging with stabilized Ag nanoparticles
Track formation in nuclear emulsion plates for cosmic-ray imaging with stabilized Ag nanoparticles
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使用稳定的银纳米颗粒进行宇宙射线成像的核乳剂板中的轨迹形成
DOI：
10.1016/j.nima.2021.165427
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
K. Morishima
中科院分区：
文献类型：
--
作者：
T. Tani;A. Nishio;T. Uchida;K. Morishima
在带有核乳剂的宇宙线成像系统中，卤化银(AgX)颗粒捕获由Muon产生的电子，形成由小到三个原子的小Ag纳米粒子(潜像中心)组成的潜像。由于粒子需要几个月的时间才能捕捉到足够数量的µ子产生的电子进行成像，因此潜像的稳定就显得尤为重要。潜像衰落有两种类型：一级反应和二级反应。前者是不是由宇宙射线辐射形成的氧化剂对潜像中心的氧化，后者是辐射产生的X2对潜像中心的再卤化。结果表明，随着乳胶层中明胶体积比的降低，X2在照射后的几天内变得比前者占优势，表明明胶对抑制这种潜像褪色是非常有效的。在前文的基础上，我们进一步利用光电子能谱对新型添加剂的性质和行为进行了研究，证明了潜像中心的褪色机理为一级反应，即一个带+1/2电荷的潜像中心通过离子过程(银离子的脱离)和电子过程(失去一个电子)的一个接一个的重复而退化，它的电荷变化到-1/2并返回。这一机理为抑制核乳剂在宇宙线成像中的潜像衰落提供了几种思路。
In cosmic-ray imaging system with nuclear emulsions, silver halide (AgX) grains capture muon-created electrons to form a latent image composed of small Ag nanoparticles (latent image centers), which could be as small as three atoms. Since it needs such a long time as several months for the grains to capture sufficient number of muon-created electrons for imaging, the stabilization of latent image is inherently important. There are two kinds of latent image fading; the first-and second-order reactions. The former is the oxidation of latent image centers by oxidants, which are not formed by cosmic-ray irradiation, and the latter is the re-halogenation of latent image centers by irradiation-created X 2. It was revealed that the latter became to be predominant over the former within several days after irradiation as the volume ratio of gelatin in emulsion layers decreased, indicating that gelatin is very effective to depress this type of latent image fading. Following the previous paper, we have extended our study on the property and behavior of new additives by means of photoelectron spectroscopy to prove the mechanism of the latent image fading with the first-order reaction, according to which a latent image center with electric charge of+ 1/2 degrades via the repetition of the ionic process (detachment of an Ag+ ion) and the electronic process (losing of an electron) one after the other, its electric charge changing to-1/2 and back. The mechanism thus proved has provided several ideas to depress latent image fading in nuclear emulsions for cosmic-ray imaging.
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DOI：
--
发表时间：
1987
期刊：
Journal of imaging science
影响因子：
--
作者：
R. K. Hallstone;N. B. Liebert;M. Levy;J. F. Hamilton
通讯作者：
J. F. Hamilton
根据久保效应检查溴化银上银纳米团簇磁化率的奇偶差异
影响因子：
3.2
作者：
T. Tani
通讯作者：
T. Tani
减敏乳剂延迟显影强化潜像的研究
DOI：
--
发表时间：
1986
期刊：
Journal of imaging science
影响因子：
--
作者：
T. Tani
通讯作者：
T. Tani
影响因子：
1.5
作者：
Ryota Kan;Yuka Yamano;T. Tani;T. Uchida
通讯作者：
Ryota Kan;Yuka Yamano;T. Tani;T. Uchida
影响因子：
2
作者：
T. Tani
通讯作者：
T. Tani