As an important nuclide in environmental impact assessment,it is challenging to realize the on-line measurement of gaseous radiocarbon effluents from nuclear facilities.An on-line measuring prototype for gaseous radiocarbon effluents based on PIPSBOX measurement technology was developed.The detection efficiency of gaseous radiocarbon measured by PIPSBOX was simulated by Geant4.The results demonstrated that measurements using the PIPSBOX was feasible.An on-line sampling system of gaseous radiocarbon gas was developed with oxidizing different forms of radiocarbon gases into 14CO2 and separating out 14CO2 by means of low temperature separation.Then,the interface of the PIPSBOX was designed and a spectroscopy system was used for the analysis and detection of radiocarbon.Finally,within 3 hours,the minimum detectable activity concentration of radiocarbon measured by the system was 0.99 Bq/m3,which was lower than the minimum activity concentration of 10 Bq/m3 with continuous collecting radiocarbon for one week.This work establishes a new method for radiocarbon measurement,realizes the on-line measurement of gaseous radiocarbon effluents,and provides reference for the on-line measurement of radiocarbon in the atmosphere.
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