A method for preparing a large-area radioactive source

Abstract

The invention belongs to the technical field of radioactive source preparation and discloses a method used for preparing a large-area radioactive source. The method comprises the following steps: placing a plating solution on a plating plate with a protection frame, wherein the plating plate is a cathode, and the mirror side of the plating plate is used as an electroplating surface; under the synergistic action of a lifting platform car, a leveling platform, a plating pen holder and a gauge block, adjusting parallelism between the plating plate and a plating pen, adjusting the distance between the plating plate and the lower end of the plating pen, and keeping the distance at 6mm; adjusting the initial position of the plating pen, setting plating pen movement speed, movement distance and other related parameters required on two-dimensional translation device control software, utilizing a computer and the two-dimensional translation device control software to carry out remote control on the stroke of the plating pen, and ensuring that the plating pen is not in contact with the plating solution protection frame in the whole stroke; and setting power supply voltage values and current values according to the types of plated nuclide, and electroplating the plating plate so as to obtain a large-area radioactive source. The method has the advantages of being great in evenness, high in electro-deposition efficiency, simple to operate and low in cost and also has the advantage that the area of the active zone can be as large as 1000cm<2>.

Description

technical field [0001] The invention belongs to the technical field of radioactive source preparation, and in particular relates to a method for preparing a large-area radioactive source. Background technique [0002] In order to detect large-area α and β surface pollution instruments, especially the detection area is up to 1000cm 2 To calibrate the pollution meter, it is necessary to prepare a large-area radioactive standard source. Traditional methods for preparing large-area radioactive sources include molecular electroplating, slurry laying and electrodeposition. Among them, the molecular electroplating method has many advantages compared with other electroplating methods, but because the anode used in the general electroplating method is mainly a single platinum wire, a coiled platinum wire or a platinum mesh, it is difficult to prepare radioactive sources with a large area. Ensure its flatness (that is, keep the distance between cathode and anode constant), especiall...

AI Technical Summary

Problems solved by technology

But there are following problems in this method and its device: 1) prepared 241 The maximum deposition efficiency of the Am radioactive source is 46.1%, the efficiency is low, and more waste liquid is produced; 2) One of the most important indicators of a large-area source is uniformity, and the brush-plating platform is not mentioned in this method and in the device used The structure of the plate, and how to level the plate to ensure that the distance between the cathode and the anode is fixed; 3) The device used uses a peristaltic pump to transport the plating solution, and the excess plating solution flows to the liquid storage tank below and is reused. The flow of the plating solution will cause a certain disturbance to the process of radionuclide electrodeposition, and will also cause a certain amount of scouring to the unstable deposits. The electroplating efficiency is low, and the radioactive plating solution is easy to splash when it flows down from the brush plating platform. , can easily cause radioactive contamination of surrounding objects

4) In the article, only radioactive sources with an active area of ​​100mm*150mm are prepared, and for areas as large as 1000cm 2 The preparation method of the radioactive source (that is, the large-area radioactive source in this application) does not involve

[0004] In the current public literature, there is no disclosure of using electroplating technology to prepare an area as large as 1000cm 2 The preparation method of the radioactive source and the device used

Images