| 摘要 |
PURPOSE:To obtain higher resolution by constituting a shield body so that its opening moves within the range of the X-ray incidence surface of each detection part. CONSTITUTION:An X-ray incidence window 2 closed with a window plate made of, for example, beryllium is formed in one surface of a rectangular plate type closed housing 1, an intake 3 and an outlet 4 for ionized gas are provided at the opposite corner part, and the X-ray shield body 5 is arranged opposite the window 2. Thus, nmbers of anode cores 6 are arrayed in parallel at intervals of several millimeters opposite the window 2, both ends are led out of side walls of the housing 1, and a cathode plate 7 is provided through the core groups opposite the window 2. For the purpose, when proper ionized gas is flowed in the housing 1 and X rays are made incident through the window 2, electrons generated by the ionization of the flowing gas are caught by nearby cores 6 and ions flow in the cathode plate 7, so the current of the cores 6 is observed to know the intensity of the X rays incident nearby respective cores 6.
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