Latent image stabilization in nuclear emulsions for cosmic-ray imaging
Latent image stabilization in nuclear emulsions for cosmic-ray imaging
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用于宇宙射线成像的核乳剂中的潜像稳定
DOI:
10.1016/j.nima.2020.164163
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
Kunihiro Morishima
中科院分区:
文献类型:
--
作者:
Tadaaki Tani;Akira Nishio;Takayuki Uchida;Kunihiro Morishima
Latent image stability is one of the most important characteristics of nuclear emulsions for cosmic-ray imaging. The emulsions studied are composed of AgBrI grains (about 200 nm in diameter) with a benzothiazolium compound (Additive Ⅰ) as a new latent-image stabilizer, and characterized by means of photoelectron yield spectroscopy in air (PYSA). The results thus observed are discussed in the light of the mechanism of latent image formation. A latent image center is composed of a small Ag cluster, and situated at a site with electric charge of+ 1/2, thus being expressed as Agn+ 1∕ 2. The growth processes for a latent image center are the trapping of an electron by Ag n− 1+ 1∕ 2 to form Ag n− 1− 1∕ 2 (electronic process), and the attachment of an interstitial silver ion to Ag n− 1− 1∕ 2 to form Ag n+ 1∕ 2 (ionic process). It is thus considered that the first step of a latent image fading is its discharge of a silver ion to form Ag n− 1− 1∕ 2, and that the second step is the oxidation of Ag n− 1− 1∕ 2 to form Ag n− 1+ 1∕ 2. It is proposed and has been confirmed by means of PYSA that Additive Ⅰ opens its ring to disclose–SH and depresses the first step of latent image fading by forming on a latent image center barely soluble silver salt with tolerance to oxidation. Discussions have been made on latent image stabilization in nuclear emulsions for cosmic-ray imaging.
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DOI:
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发表时间:
1987
期刊:
Journal of imaging science
影响因子:
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