Possibility of screen-type X-ray film for observation of heavy cosmic-ray primaries

Masakatsu Ichimura, Eiji Kamioka, Motoyasu Kitazawa, Keisuke Kirii, Tadashi Kobayashi, Toru Shibata, Masataka Kogawa, Shuichi Kuramata, Hideya Matsutani, Takayuki Murabayashi, Hirotada Nanjyo, Zenjiro Watanabe, Hisahiko Sugimoto, Kazuma Nakazawa

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8 Citations (Scopus)


This article discusses the possibility of screen-type X-ray film for the observation of heavy cosmic-ray primaries. We investigate in detail the optical characteristics of the intensifying screen Gd2O2S:Tb, and perform a simulation calculation for three-dimensional diffusion of scintillation light emitted from numerous δ-rays (knockon electrons produced by a heavy primary) in the screen. On the basis of these theoretical speculations, we report the experimental results obtained recently by a balloon-borne emulsion chamber with full use of the screen type X-ray film, focusing to the charge resolution of heavy primaries and their flux with energy larger than the rigidity cutoff at Sanriku latitude, Ec∼ 4 GeV/n. All results show that the emulsion chamber with multilayered screen-type X-ray film is quite valid and powerful for the observation of heavy cosmic-ray primaries.

Original languageEnglish
Pages (from-to)374-394
Number of pages21
JournalNuclear Inst. and Methods in Physics Research, A
Issue number2
Publication statusPublished - 1991 Jan 15
Externally publishedYes


ASJC Scopus subject areas

  • Instrumentation
  • Nuclear and High Energy Physics

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