Study and Application of Radon Value Transmission Technology Based on Standard Instruments
The AlphaGUARD radon meter is generally widely used as a radon standard in-strument for value transfer.This article studied the accuracy of the AlphaGUARD radon meter in low range and consistency in high range,and established a linear relationship for value transfer within the range of 0.6～142.4 Bq·L-1.Based on tracing to reference standards,radon standard instruments are used to transfer values to circulating radon sources.Quantity transfer experiments based on circulating radon sources,as well as quantity transfer experiments based on standard instruments and certain concentration wa-ter samples(greater than 5 Bq·L-1),are conducted separately.Seven technical schemes for transmitting measurement values using radon standard instruments have been devel-oped for four new types of radon meters used in the underground fluid network in recent years,and have been applied in more than 40 radon observation stations nationwide.The continuous application of 12 observation stations for 2 years has shown that the radon val-ue transmission technology scheme is scientifically feasible.Among the 12 radon observa-tion stations,the relative deviation coefficients was less than 5％.This technology scheme can meet the calibration needs of existing radon observations.In addition,uncertainty e-valuation experiments were conducted on the transmission scheme.Taking the DDL radon meter as an example,its minimum uncertainty can reach 5.5％(coverage factor k=2).The radon measurement value trans mission technology established in this study is scientif-ically feasible,and the application plan can effectively ensure the stability and reliability of the new radon measurement instrument.
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