Preparation method of tritium impregnated target slice

Abstract

The invention relates to a preparation method of a tritium impregnated target slice. The method comprises the steps of 1, selecting a circular high-purity molybdenum slice as a tritium target substrate material; 2, ultrasonically washing the circular molybdenum slice through an acetone solution to remove oil dirt on the surface; 3, plating a titanium film on the upper surface of the circular molybdenum slice by the magnetron sputtering coating process, synchronously transforming the titanium film into a Ti-Mo alloy film by the high-temperature vacuum heat processing method, and forming a Ti-Mo alloy dispersion layer with a certain thickness the circular molybdenum slice and the target film; 4, degassing the tritium impregnated target slice at high temperature under high vacuum, absorbing / discharging tritium to a target film to activate, and then gradually absorbing tritium to the target film at proper rate until reaching saturation. With the adoption of the preparation method of the tritium impregnated target slice, the separated out brittle hybride can be decreased, and the brittleness can be effectively controlled; the attaching force of the target film is improved; the carbon pollution is reduced, the oxygen is stopped dispersing inside, and therefore, the purity of the target film is improved, and the tritium absorbing activity of the target film can be improved; the neutron yield of a neutron tube or a neutron generator is increased, and the service life is prolonged.

Description

technical field [0001] The invention belongs to the field of tritium target preparation, and in particular relates to a preparation method of a tritium absorption target sheet suitable for neutron tubes and neutron generators. Background technique [0002] The tritium target is a key component of the neutron tube and neutron generator. The downhole temperature of the logging neutron tube will be as high as 150 °C, and the continuous working time is often as long as several hours. The local temperature of the target film surface will increase following the bombardment of the ion current, which requires the tritium target not only to have a high tritium absorption density, but also to have a high thermal stability. [0003] During the storage process, the He-3 decayed into tritium will gradually accumulate in the target film, and a large amount of He-3 in the target film will be released, which will lead to an increase in the internal pressure of the neutron tube, deterioratio...

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Problems solved by technology

However, pure titanium film has the following defects as a tritium-absorbing film material: 1. After the titanium film absorbs tritium, there will be a unique hydrogen embrittlement phenomenon, which will deteriorate the mechanical properties of the material, cause the target film to drop powder, and cause high-voltage breakdown of the neutron tube; 2. 1. The titanium film is easily polluted by C, O and other elements, forming carbides or oxides of several nanometer layers, which reduces the tritium absorption performance of the titanium film; 3. The deuterium-tritium isotope effect of the titanium film is a strong positive isotope effect , that is, the pure titanium membrane preferentially adsorbs deuterium atoms in the deuterium-tritium mixed gas

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