Patent ID: 9224585
Filing Date: 2015-12-29
Classification: H01J,H01R,H02G

Abstract:
1. A dose-rate measuring system comprising: an ionization chamber that detects a radiation incident from the outside and outputs ionization current; a current-signal MI cable, which is fixed to a cabinet of the ionization chamber, for transmitting the ionization current that is outputted from the ionization chamber; a high-voltage MI cable, which is fixed to the cabinet of the ionization chamber, for supplying a high voltage, by which the ionization chamber is operated, to the ionization chamber; a current-signal cable, which is connected to the current-signal MI cable via a first connector, for transmitting the ionization current that is outputted from the ionization chamber; a high-voltage cable, which is connected to the high-voltage MI cable via a second connector, for supplying a high voltage to the ionization chamber; a signal converter, to which the ionization current is inputted from the current-signal cable, that converts the ionization current into a signal, which corresponds to the ionization current, so as to output the signal, and relays the high voltage to the high-voltage cable; and a measuring unit that converts the signal, which is inputted from the signal converter and corresponds to the ionization current, into a dose rate so as to display the dose rate, and outputs a high voltage to the signal converter; wherein the cabinet of the ionization chamber, a shield provided for the current-signal MI cable, a shield provided for the high-voltage MI cable, a shield provided for the current-signal cable, a shield provided for the high-voltage cable, a cabinet provided for the signal converter, and a cabinet provided for the measuring unit, are connected in series, and a single-point ground is performed only at the measuring unit, and moreover, a heat-resistant insulating material having water repellency is coated on a fixed portion of the ionization chamber, whereby the ionization chamber is electrically insulated from a chassis at a fixed side, and the heat-resistant insulating material having water repellency is coated on a first connecting portion of the first connector, which connects the current-signal MI cable to the current-signal cable, and on a second connecting portion of the second connector, which connects the high-voltage MI cable to the high-voltage cable, after a waterproof process is performed on each of the connecting portions by using a bonding tape, and wherein the heat-resistant insulating material is provided only in the vicinity of the fixed portion of the ionization chamber to the chassis, so that a portion of an outer surface of the ionization chamber other than at the vicinity of the fixed portion is without the heat-resistant insulating material.