Ionization chamber
AssigneeHamamatsu Photonics K.K.
InventorsEiichi Tanaka, Tatsuro Hayashi
Life of this patent
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Abstract
An ionization chamber can stably measure a weak ionizing radiation with high sensitivity. The ionization chamber comprises an electrically conductive charge collecting electrode having a magnetic substance or a permanent magnet; an electromagnet for positioning the charge collecting electrode in non-contact with the other part of the ionization chamber; a position sensor for detecting the position of the charge collecting electrode; a circuit for feedback-controlling the magnetic force of the electromagnet to maintain the charge collecting electrode at the substantially same position; and ionization current detecting circuit for detecting an ionization current collected at the charge collecting electrode by ionization due to radiation applied to the ionization chamber.
Claims9
An ionization chamber comprising:
- means to define an enclosure of said ionization chamber
- an electrically conductive charge collecting electrode including one of a magnetic substance and a permanent magnet;
- an electromagnet for positioning said charge collecting electrode in non-contact with enclosure defining means of said ionization chamber;
- a position sensor for detecting the position of said charge collecting electrode;
- a circuit for feedback-controlling the magnetic force of said electromagnet to maintain said charge collecting electrodes at the substantially same position;
- and
- ionization current detecting means for detecting an ionization current collected at said charge collecting electrode by ionization due to radiation applied to said ionization chamber.
Dependencies are inferred from the claim text.