| 摘要 |
PURPOSE:To improve the electric-charge collection efficiency of an ionization chamber detector by concentrically installing a sticklike inside-electrode, electrically associated with an outside electrode, in the cylindrical outside-electrode, and then arranging thin central-electrode members respectively in concentricity to the central axis of the outside electrode. CONSTITUTION:A central electrode 3 is made of metal in a cylindrical shape of such a size that a distance r2 from an inside electrode 2 may be equal to a distance r1 to an outside electrode 1, and it has one end thereof airtightly fixed to an insulating plate 4 so as to be arranged concentrically between these electrodes 1,2. The electrode 2 is electrically associated with the electrode 1 at its bottom. A high voltage is applied between the electrodes 1 and 3 by a high-voltage power source 5 and a lead wire extended from the electrode 3 is connected to a very small current amplifier 7 via a coupling capacitor 6. This structure can shorten the distance between the electrodes 2 and 1 so as to improve the electric-charge collection efficiency of an ionization chamber detector, without reducing most of the content volume of the electrode 1.
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