| 摘要 |
PURPOSE:To reduce the change of the ionization capacity and reduce the fluctuation of the measured radiation quantity against the change of the ambient temperature by providing a tension applying mechanism applying the tensile force at least one of at least two plane electrodes arranged face to face. CONSTITUTION:When anode plane electrodes 1 on both sides are heat-deformed by the change of the ambient temperature and deflection is generated, it is absorbed by the tensile force of the spring 13 of the bent section of the plane electrode 1, and the plane is maintained. When a cathode plane electrode 2 is heat-deformed by the change of the ambient temperature, the sum of respective distances between the cathode plane electrode 2 and the anode plane electrodes 1 on both sides is constant, and changes of distances between the electrodes are offset. The ionization capacity generated by the anode plane electrodes 1 on both sides and the opposite portion of the cathode plane electrode 2 has no change. The measured radiation quantity is not fluctuated regardless of the change of the ambient temperature.
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