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System and method for rapidly separating Kr and Xe in complex fission product

A fission product and separation system technology, which is applied in the field of radiochemical separation and purification, and can solve the problems of long analysis time, complex equipment, and inability to obtain

Active Publication Date: 2019-06-28
CHINA INSTITUTE OF ATOMIC ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the research on gas fission products is mainly aimed at the analysis of Kr and Xe in the atmosphere environment, the procedures established and the equipment used are usually relatively complicated, and the analysis time is long
The analysis of short-lived Kr and Xe is usually without a chemical separation process, so it is impossible to obtain high-purity short-lived Kr and Xe isotopes; after gas collection, it is directly resolved and measured by HPGeγ detector or mass spectrometer after the concentration step. It is difficult to obtain nuclear data of short-lived Kr and Xe isotopes with high precision

Method used

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  • System and method for rapidly separating Kr and Xe in complex fission product

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Embodiment 1

[0059] A rapid separation system for Kr and Xe in complex fission products, the system includes:

[0060] Rapid sampling unit for extraction of gaseous fission products from irradiated targets; iodine removal unit for removal of iodine from gaseous fission products; xenon purification collection unit for short-lived xenon purification and collection; short-lived krypton isotope purification and collected krypton purification collection unit; control unit for controlling temperature, vacuum degree, and gas transmission mode in the system; vacuum unit; helium gas storage tank 1; xenon gas storage tank 2; krypton gas storage tank 3 and buffer tank 11;

[0061] The rapid sampling unit, the iodine removal unit, the xenon purification collection unit, and the krypton purification collection unit are sequentially connected through pipelines and corresponding valves according to the process sequence;

[0062] The vacuum unit mainly includes a vacuum pump 12, which is used to evacuate ...

Embodiment 2

[0070] The difference from Example 1 is that the irradiation target is a uranium target. The rapid sampling unit mainly includes a sampling chamber 4; the irradiation target is located inside the chamber of the sampling chamber 4, wherein the fission gas contained in the irradiation target includes short-lived krypton, short-lived xenon, iodine and other miscellaneous gases; the sampling chamber The chamber of 4 is provided with a tool for rapidly releasing the fission gas in the irradiation target; the helium gas storage tank 1 passes through the electromagnetic valve S 1 , mass flow meter TF 1 and solenoid valve S 7 The pipeline where it is located is connected to the top of sampling chamber 4; after the fission gas is released, all of it enters the iodine removal unit under the action of helium gas carrier and vacuum atmosphere, which ensures the gas yield and realizes rapid transmission.

Embodiment 3

[0072] Different from Example 1, the iodine removal unit includes an iodine adsorption column 5, wherein the iodine adsorption column 5 passes through the solenoid valve S 13 , three-way valve TF 2 , by Tf 3 、Tt 2 The pipeline where it is located is connected with the bottom of the sampling chamber 4 .

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Abstract

The invention belongs to the technical field of radiochemical separation and purification and discloses a system and method for automatically and quickly separating isotopes of Kr and Xe with short life in a complex gas fission product. The system comprises a quick sampling unit, an iodine removal unit, a xenon purification and collection unit, a krypton purification and collection unit, a controlunit, a vacuum unit, a helium gas storage tank, a xenon gas storage tank, a krypton gas storage tank and a buffer tank, wherein the method comprises the following steps of: (1) setting a vacuum atmosphere; (2) sampling; (3) removing iodine; (4) adsorbing xenon; (5) desorbing impurity gas in a xenon adsorption column; (6) desorbing xenon; (7) adsorbing krypton; and (8) desorbing impurity gas and krypton. According to the system and method, the recovery rate of krypton and xenon is more than 90%, the decontamination factor of iodine is more than 1*104, the decontamination of xenon in krypton ismore than 1*103, the decontamination of krypton in xenon is 3*103, and all process working hours can meet the time requirement of separation and purification of the isotopes of Kr and Xe with short life.

Description

technical field [0001] The invention belongs to the technical field of radiochemical separation and purification, in particular to a system and method for automatic and rapid separation of short-lived isotopes of Kr and Xe in complex gas fission products. Background technique [0002] The radioactive isotopes of Kr (krypton) and Xe (xenon) have a high yield during the fission of uranium and plutonium, and are important gas fission products for fission monitoring. However, the accuracy of the nuclear data of short-lived isotopes of Kr and Xe is low, which has a great influence on the analysis of fission burnup. To carry out remeasurement work to improve the precision of these nuclear parameters, short-lived isotopes of Kr and Xe need to be prepared in high purity. [0003] For the separation, purification and analysis of short-lived gas fission products, foreign countries mainly use the method of combining an online isotope separator with an inert gas mass spectrometer, whic...

Claims

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Application Information

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IPC IPC(8): B01D53/04G01N1/24G21G1/08
Inventor 毛国淑丁有钱杨建勋岳远振宋志君
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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