Tritium gas flow generator system with constant concentration and method thereof

Abstract

The invention discloses a tritium gas flow generator system with constant concentration and a method thereof. The tritium gas flow generator system comprises a closed loop circuit in which a tritium gas flow generator, a monitor for to-be-detected tritium gas and a tritium gas flow circulation pump are installed sequentially. The closed loop circuit is also provided with a temperature control unit matched with the tritium gas flow generator, an inlet end and an outlet end of the temperature control unit are both provided with a temperature sensor. An inlet end and an outlet end of the tritium gas circulation pump are both provided with a pressure sensor. A hygrometer is arranged between the temperature control unit and the monitor for to-be-detected tritium gas, and a nitrogen reservoir in communication with the tritium gas flow generator is also included for supplying the nitrogen reservoir with dry nitrogen. The tritium gas flow generator system achieves value traceability of a gas-borne tritium monitor, realizes accurate calibration of the gas-borne tritium monitor, and achieves gas-borne tritium monitoring of large-scale nuclear power devices, military isotope production reactors, military isotope content test sites, and military isotope packaging use sites.

Description

technical field [0001] The invention relates to the field of radiometric calibration, in particular to a constant concentration tritium flow generator system and method. Background technique [0002] At present, the calibration of tritium gas monitors usually adopts the principle of bubbling method to design a set of standard device of tritium air flow generator, so that the dried air with a certain flow rate is bubbled into the tritium-containing water at constant temperature to generate saturated tritium air flow, and then let The tritium gas flow passes through the tritium gas monitoring instrument, and finally a condensation recovery device is installed at the end to quantitatively analyze the recovered tritiated water, and the activity concentration of the tritium gas flow during the bubbling process is reversed to realize the calibration of the tritium gas monitoring instrument. However, due to the existence of the isotope fractionation coefficient (the ratio of the ga...

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Problems solved by technology

However, due to the existence of the isotope fractionation coefficient (the ratio of the gaseous tritium bubbling out of the bubbler to the activity concentration of liquid tritium in the bubbler during the bubbling process) and less than 1, the activity concentration of the bubbling tritium stream It is not constant. As the bubbling process continues, the activity concentration of the bubbling tritium gas flow will gradually increase, and the quality of tritium water in the bubbler will gradually decrease. After a certain period of time, the saturated tritium gas flow cannot be bubbling, and the bubbling needs to be stopped. Soaking and re-adding tritium water cannot meet the requirements of long-term experiments

Dry air materials are usually dried with molecular sieves and silica gel as a dryer, which cannot guarantee absolute dryness of the air, which affects the accurate calibration of the tritium gas monitor

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