Gamma-ray compensated ionization chamber
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorMinoru Oda
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Abstract
A gamma-ray compensated ionization chamber wherein the state of compensating a gamma-ray is controlled by utilizing the effect that a change in the applied voltage ratio of a high-voltage electrode to a compensating electrode changes the form of an electric field around the holes in a signal electrode.
Claims7
A gamma-ray compensated ionization chamber having a neutron ionization chamber and a compensating ionization chamber formed among a first electrode, a second central electrode, and a third electrode disposed apart from one another at a prescribed distance, means for measuring a neutron flux from a neutron current outputted by the central electrode, wherein a gamma-ray current component contained in an ionization current flowing in the neutron ionization chamber from said first electrode to the second central electrode is compensated by a gamma-ray ionization current flowing in the compensating chamber from said second central electrode to said third electrode, comprising:
- a plurality of holes formed in said second central electrode for passing through an electrode force from said first electrode to said third electrode;
- and
- means for varying the ratio of a voltage potential of the first electrode to a voltage potential of said third electrode;
- whereby the effective volumes of both chambers where the gamma-ray currents flow are varied by a change in electric force from the neutron ionization chamber to the compensating ionization chamber through said plurality of holes so as to equalize the quantity of the gamma-ray currents flowing in both chambers.
Dependencies are inferred from the claim text.