Development of Automatic Device for Calibration of Trace Radon Analyzers
A dynamic stability technique for antomatic calibration of trace concentration of radon in the air and the method for the precise detection of the concentration of radon and radon decay products were tentatively investigated.A homemade standard radon chamber with the functions of autocontrolling radon concentration,temperature and humidity,formation and collection of aerosol,was constructed.Setting up a detective and experimental study platform for radon detection instrument calibration and calibration devices with a radon chamber of 4 m3.This also sveer asa sensitive analyzer for detction of the radon decay products in radioactive aerosol were carried out.The radon concentration detected by the device ranges from 370 Bq/m3 to 20000 Bq/m3 with the precision of 3%.The calibration time of the homemade standard radon chamber for a single point is 40 min and for a radon instrumentation was 7 h.Moreover,3 active mode radon instruments and 4 to 6 passive mode radon instruments can be corrected simultaneously.The certificate,report,data and results can be automatically generated and saved,and the operators can find the results in many ways.