Continuous monitoring system of environmental γ radiation near nuclear facility

The continuous monitor system for environmental γ radiation and accidental emergency near a nuclear facility is described. The continuous monitor system consists of high pressurized ionization chamber, integrated weak current amplifier, V-f converter and intelligent data recorder. Microcomputer is used for data handling and plotting with standard RS-232-C interface. The data recorder has the functions of alarming over threshold and recording output signals of detector and temperature. The measurement range is from 10 nGy·h-1 to 20 mGy·h-1, because a high insulation switch automatically changing measurement range is used. The monitor system has been operating continuously for a long time with high stability and reliability