<論文>宇宙X線観測用蛍光比例計数管の開発

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Gas Scintillation proportional counter has been developed for the space observation of cosmic X-rays. This technique provides twice as good an energy resolution as that of ordinary proportional counters, hence a powerful tool for the spectroscopy of the X-ray sources. The characteristics of the gas scintillation proportional counter are reviewed, and technical problems are discussed. In particular, the properties for soft X-rays in the energy range 0.1 - 1.5 keV were extensively examined. A significant distortion of the pulse-height distribution due to a low-energy tail is noticed. This feature is interpreted in terms of a loss of primary electrons captured by the entrance window. The influence of impurities on the gain and the resolution is particularly important for the gas scintillation proportional counters and the effect is quantitatively analysed. Gas scintillation proportional counter equipped with the window consisting of very thin polypropylene film is discussed, which was successfully used for rocket observations of cosmic soft X-rays.
宇宙航空研究開発機構の論文