Normal temperature enrichment and sampling method for xenon in air, and apparatus thereof

Abstract

The invention relates to a normal temperature enrichment and sampling method for xenon in air, and an apparatus thereof. According to the present invention, a hollow fiber semi-permeable membrane group is adopted as an air pretreatment apparatus; a four-stage adsorption column is adopted to enrich and concentrate the xenon in the air step by step, wherein the first-stage adsorption column adopts two sets of parallel structures, the two sets of the parallel structures alternatively work, such that continuous and uninterrupted sampling is realized; an adsorbent of activated carbon is adopted. With the present invention, the apparatus of the present invention has characteristics of rational design, simple structure and convenient operation; the difficulty of impurity removing in the subsequent concentration process is reduced; the apparatus is applicable for long-termly monitoring the atmospheric environment; the sampled sample has strong representativeness, and no time empty window is generated; the method and the apparatus can be applicable for sampling the noble gas xenon in the air.

Description

technical field [0001] The invention belongs to a nuclear environment monitoring method, in particular to the enrichment and separation of xenon, a rare gas in the atmosphere. Background technique [0002] Radionuclide monitoring technology is one of the four key verification technologies stipulated in the Comprehensive Nuclear-Test-Ban Treaty (CTBT). The characteristic radionuclides produced and released by nuclear activities play a decisive role in the qualitative identification of suspicious events in CTBT verification. The sampling and analysis technology for these nuclides has always been the focus of radionuclide monitoring technology research. The radioactive noble gases of interest in the international radionuclide monitoring system are radioactive xenon isotopes (mainly including 131m Xe, 133m Xe, 133 Xe, 135 Xe). [0003] The volume fraction of the rare gas xenon in the air is 8.7×10 -8 (v / v), in which the content of radioactive xenon isotopes is lower and di...

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Problems solved by technology

[0004] Literature search information: Invented by Zhou Chongyang and others in the 63653 Army of the Chinese People's Liberation Army, the patent No. CN201728039U "A Separation Device for Enriching Gas Xenon" uses a first-level 5A molecular sieve impurity removal column, a first-level activated carbon adsorption column, and a second-level 5A Molecular sieve plus activated carbon impurity removal column, secondary activated carbon adsorption column, third-stage 5A molecular sieve plus activated carbon impurity removal column, and third-stage activated carbon adsorption column to enrich and separate xenon. A total of 6 adsorption columns are used, involving 2 types and 2 specifications each Adsorbent, and continuous sampling cannot be achieved

Another invention by Zhou Chongyang and others, the patent No. CN 101985080A "A Method for Enrichment and Separation of Xenon Using Activated Carbon", can only process xenon standard gas with a concentration of 10-1000ppm, and cannot directly sample from the air

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