Device and method for preparing 85Kr standard source

Abstract

The invention discloses a device and method for preparing a 85Kr standard source. The device comprises a collector, a liquid nitrogen tank, a dryer, a membrane pump, a vacuum pump, a vacuum meter, a container, multiple connecting pipes and multiple valves, wherein the collector is used for collecting 85Kr gas, and the liquid nitrogen tank is used for liquid nitrogen storage and collector condensation; the gas outlet of the collector is connected with the vacuum meter through a connecting pipe and connected with the vacuum pump and the membrane pump; the gas inlet of the collector is connectedwith the dryer through a connecting pipe, the dryer is connected with the container through a connecting pipe, the container is connected with the membrane pump and the collector through a connectingpipe, and the container is used for injecting the 85Kr gas into a loop during 85Kr standard source preparation and temporarily storing the 85Kr gas. The device has the advantages that the device has an optimal 85Kr gas collecting effect, the 85Kr standard source prepared by the device can be directly used for the efficiency calibration of 85Kr quantitative analysis and measuring equipment so as toachieve fuel element failure 85Kr quantitative analysis, and a fuel element failure detection method is allowed to be fast, accurate and reliable.

Description

technical field [0001] The invention relates to the field of nuclear technology application and radiometric measurement, in particular, to a method for preparing 85 Device and method for Kr standard source. Background technique [0002] Damaged fuel elements 85 Kr detection is a common method for checking the damage of spent fuel elements outside the pile. Currently domestic fuel elements are damaged 85 The main method of Kr detection is to use the adsorption of activated carbon, adopt the low temperature trapping method or vacuumize the gaseous state 85 Kr, and then use the digital spectrometer measurement system to measure the spectrum of the trapping device in the laboratory, by measuring the presence or absence of 85 The 514keVγ characteristic peak of Kr is used to judge whether the spent fuel is damaged. In existing methods, there is a lack of 85 The research on the influencing factors of Kr collection efficiency, the collection efficiency of the capture device ca...

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Problems solved by technology

[0003] The invention provides a method for preparing 85 The device and method of Kr standard source, in order to improve the trapping device to 85 Acquisition efficiency of Kr, solving the damage of existing fuel elements 85 The Kr detection method can only be used for qualitative inspection, but cannot be analyzed quantitatively, which will increase the damage of fuel elements 85 The accuracy and reliability of Kr detection, this patent invented a method for preparing 85 The device and method of Kr standard source, the device is to 85 Kr has the best acquisition efficiency, the prepared 85 The Kr standard source can be used directly for 85 Kr Quantitative Analysis Measuring Equipment Efficiency Scale for Fuel Element Breakage 85 Kr quantitative analysis makes the fuel element damage detection method faster, more accurate and more reliable

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