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Experimental device for measuring nuclide diffusion parameters

An experimental device and nuclide technology, applied in the field of nuclide migration research, can solve problems such as troublesome operation, and achieve the effects of simple assembly process, enhanced sealing performance, and good application prospects

Pending Publication Date: 2022-05-10
HUZHOU TEACHERS COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when using the penetrating diffusion method for experiments, it is necessary to ensure that the concentration of nuclides in the sample bottle is much lower than that in the stock solution pool. The solution must be taken out with a peristaltic pump, and then pumped into a new solution, which is troublesome to operate.

Method used

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  • Experimental device for measuring nuclide diffusion parameters
  • Experimental device for measuring nuclide diffusion parameters
  • Experimental device for measuring nuclide diffusion parameters

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] First install the diffusion cell, put a sealing ring in the groove 8 of the left bottom cover 3 and the right bottom cover 4 of the diffusion cell, connect the left bottom cover 3 with the hollow cylinder 2, put a piece of filter disc 7 and porous material soil block 12 , connect the right bottom cover 4, lock the left bottom cover 3 and the right bottom cover 4 with the locking mechanism 5. Then insert the connector 6 of the right bottom cover 4 into the round hole on one side of the square bottle 1 . Finally, the rotatable and detachable infusion head 10 is installed on the left bottom cover 3 of the diffusion cell, according to figure 1 The liquid inlet conduit 11 is connected with the peristaltic pump 13 and the sample bottle 14 in the connection manner.

[0038]When using the penetrating diffusion method, 500mL solution is added to the square bottle 1, and after 5 weeks of equilibration, radionuclides such as Re(VI I) are added. The compacted Gaomiaozi bentonite ...

experiment example 2

[0039] Experimental example 2: adopt internal diffusion method, 500mL solution is added in the square bottle 1, after equilibrating for 5 weeks, add Se(IV) and other strongly adsorbed radionuclides, under the effect of concentration gradient, Se(IV) from The compacted Gaomiaozi bentonite 12 contacting one side of the square bottle 1 diffuses to the other side, and the variation of Se(IV) concentration with the diffusion distance is formed in the compacted Gaomiaozi bentonite 12 . After diffusing for a certain period of time, the diffusion pool is opened, and the compacted Gaomiaozi bentonite 12 is pushed out, and the bentonite soil block 12 is cut into thin discs with a thickness of 0.1-1mm according to the vertical diffusion direction. The concentration of Se(IV) in bentonite soil block 12 was analyzed, and the data was processed with a diffusion parameter fitting program to obtain diffusion parameters, including effective diffusion coefficient, rock capacity factor and partit...

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Abstract

The invention provides an experimental device for measuring nuclide diffusion parameters, and belongs to the field of nuclide migration research. Comprising a diffusion pool, a square bottle, a peristaltic pump and a sample bottle, the diffusion pool is composed of a bottom cover, a hollow cylinder, a locking mechanism, filter discs and a porous material soil block, the porous material soil block is placed in the hollow cylinder, the two sides of the porous material soil block are clamped and fixed through the filter discs, and a left bottom cover and a right bottom cover are installed on the two sides of the hollow cylinder respectively; the left bottom cover, the right bottom cover and the hollow cylinder are fixedly connected into a whole through a locking mechanism, and sealing washers are installed at the connecting positions of the hollow cylinder and the left bottom cover / the right bottom cover. The device is used for researching the diffusion behavior of radionuclides in a high-level radioactive waste repository, has the advantage of being easy to disassemble, and can be used for developing a penetration experiment method, researching weak-adsorbability nuclides, developing an internal diffusion experiment method, researching diffusion experiments of strong-adsorbability radionuclides (such as uranium, neptunium and plutonium) and measuring diffusion parameters.

Description

technical field [0001] The invention belongs to the field of nuclide migration research, in particular to an experimental device for measuring nuclide diffusion parameters. Background technique [0002] In the field of geological disposal of high-level radioactive waste, safety assessment is a very important task. Migration parameters with disposition characteristics must be used, including physical parameters such as diffusion coefficient, partition coefficient, porosity, etc. Usually, multiple barriers are used to block the migration of high-level radioactive waste from the repository to the biosphere. The migration behavior of nuclide in compacted bentonite backfill material and natural clay / granite is mainly diffusion. [0003] There are various types of high-level radioactive waste, including fast-diffusing anions and neutral molecular nuclides, such as 99 Tc, 129 I. 79 Se, HTO, and cationic nuclides with very slow diffusion rates, such as actinides 238 U 237 Np,...

Claims

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Application Information

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IPC IPC(8): G01N13/00
CPCG01N13/00G01N2013/003
Inventor 伍涛楼少峰谢心媛
Owner HUZHOU TEACHERS COLLEGE
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