The radiation monitoring for the gaseous and liquid effluents from a nuclear facility has received more and more attention in recent years since it can indicate the discharge characteristic of the radioactive substance which is used for the environmental impact assessment. In the 10MW high temperature gas-cooled reactor (HTR-10), the stationary differential ionization chamber detector and single chip processor controlled circuit board were adopted to monitor the total β activity of the gaseous effluent from the stack. In the current paper, the design principle, structure composition, function declaration and technical characteristic of the total β monitoring channel of the radioactive gaseous effluent in HTR-10 are presented. The problems in operation of this installation are analyzed and discussed in detail. The digitized improvement of the analog processing circuit is implemented. The stability and reliability of the total β monitoring channel of the radioactive gaseous effluent in HTR-10 are enhanced after the improvement and recalibration.

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