PLANT FOR MEASURING THE ACTIVITY OF TRITIUM, CARBON-14, INERT RADIOACTIVE GASES IN GASEOUS EMISSIONS Russian patent published in 2023 - IPC G01T1/178 G01T7/08 G01N1/22 

FIELD: radioactive gases.

SUBSTANCE: methods for measuring the volumetric activity of radioactive gases. A plant for measuring the activity of tritium, carbon-14, inert radioactive gases (hereinafter referred to as IRG) in gaseous emissions, containing a filter holder with a filter, a gas flow meter with a gas control function, an air pump, a bubbler assembly, an operator panel, a programmable controller, a nitrogen trap assembly, which provides the determination of the composition of the IRG by the gamma spectrometric method. At the same time, three detection units were additionally introduced to perform a quantitative measurement of the current total volumetric activity of gaseous emissions, the volumetric activity of IRG, tritium and carbon-14; additionally quick-detachable cryogenic connections are introduced, which allow to quickly disconnect nitrogen traps from gas-air lines; additional droplet eliminators are introduced into the bubblers to protect the detection units and prevent the injection of a humid environment into nitrogen traps; additionally, a top-level PC is introduced, which implements automatic calculation of the conversion ratio of the ionization current of the detection units for tritium, carbon-14 and IRG, maintaining a database, calculating the activity of each of the controlled radionuclides in the release over a given period of time, taking into account changes in the gas-air mixture.

EFFECT: continuous monitoring of gaseous emissions by the ionization method with correction for the radionuclide composition of the gaseous emissions with a time lag and obtaining lower measurement limits for the volumetric activity of radioactive gases.

1 cl, 1 dwg