| 摘要 |
PURPOSE:To improve the geometrical efficiency of a detector for making a gas monitor highly sensitive by using an optical fiber as a detecting member, and closely winding the optical fiber on a gas sampling tank having optional volume. CONSTITUTION:A detector is arranged inside a gas sampling tank 2, and composed of scintillation optical fiber 1 which is coiled into one or more layers so as to adhere closely to the inner wall of the tank 2. The periphery of the tank 2 is enclosed with a shielding member 3, and a photomultiplier device 4 is severally arranged at both the ends of the optical fiber 1. Gas is ventilated into the tank 2, and when gas to emit radiation is contained, the radiation emitted toward a tank side wall produces an interaction such as collision with the optical fiber 1 to emit the scintillation light in the optical fiber 1. The scintillation light is collected at both the ends of the optical fiber 1, and converted into an electric signal in the multiplier device 4 and measured.
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