On-site calibration device of airborne tritium monitoring instrument

Abstract

The invention discloses an on-site calibration device of an airborne tritium monitoring instrument. The on-site calibration device of the airborne tritium monitoring instrument comprises an air processor, a bubbling unit, a transmission instrument, an aspirator pump and a recovery unit, all of which are sequentially connected, wherein the air processor is used for filtering and drying inlet air, the bubbling unit is used for bubbling tritiated water to form saturated tritium flow, the transmission instrument is used for being connected with a calibrated detection instrument and measuring the activity and concentration of the tritium flow generated on site, the aspirator pump is used for pumping the tritium flow into the recovery unit for recovery after the activity and concentration of the tritium flow generated on site are detected, and the recovery unit is used for cooling and recovering the recovered tritium flow. The ranges of the activity and concentration of the tritium flow generated by the on-site calibration device of the airborne tritium monitoring instrument in a bubbling mode depend on the total activity of the tritium flow for bubbling and can meet the calibration of most existing nuclear facilities using the measuring span of the tritium monitoring instrument. The uncertainty of the synthesis standard of the activity and concentration of the bubbled tritium flow is less than or equal to 10 percent, and the recovery rate of the tritiated water vapor by the recovery unit is more than 99 percent.

Description

technical field [0001] The invention relates to the field of ionizing radiation measurement, in particular to an on-site calibration device for an airborne tritium monitor. Background technique [0002] Gaseous tritium will be released during the operation of military isotopes, nuclear fuel production and use, reactors, nuclear power plants and other nuclear facilities. On the one hand, these gaseous tritiums will bring radiation hazards and environmental pollution to personnel. On the other hand, the emission of gaseous tritiums is an important basis for nuclear facility operation and environmental safety assessment. At present, airborne tritium monitors have been installed in many nuclear facilities and radioactive workplaces. For this type of monitor, according to the "Measurement Law of the People's Republic of China", it belongs to the category of compulsory verification, and periodic verification (or calibration) must be carried out. However, since the corresponding ...

AI Technical Summary

Problems solved by technology

However, since the corresponding standards and technical specifications have not been established in China, the calibration of the airborne tritium monitor has not yet been carried out, and the accuracy of the measurement results cannot be guaranteed

In addition, as a part of the process monitoring system, the airborne tritium monitor in nuclear facilities cannot be sent to the laboratory for traceability after the installation, commissioning and operation of the equipment due to the inconvenience of disassembly and pollution after operation, and can only be calibrated on site.

[0003] According to the patent search, the on-site calibration technology of airborne tritium monitors is still in the research stage, and no written records of on-site calibration devices with similar functions for airborne tritium monitors have been retrieved

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