Neutron source lithium target, preparation method thereof and vehicle-mounted accelerator

Abstract

The invention discloses a neutron source lithium target and a preparation method thereof and a vehicle-mounted accelerator, the neutron source lithium target comprises a substrate and a lithium target arranged on the substrate, the lithium target comprises a lithium sample and a metal film coated on the surface of the lithium sample, and the metal film adopts a gold film, a platinum film, a silver film or a palladium film. After the lithium sample is coated with the metal, the lithium sample is greatly prevented from being corroded by reactive gas and deteriorated, the stability is good, and the service life of the lithium target can be prolonged. Therefore, when the lithium target is arranged on the substrate, a user does not need to worry about the corrosion problem of the lithium sample, the assembling difficulty of the lithium sample and the substrate is greatly reduced, and the problem that the lithium sample is extremely easy to oxidize when the lithium sample and the substrate are assembled in the prior art can be effectively avoided. The influence of the gold, platinum, silver or palladium film on the neutron yield and energy spectrum distribution under the proton bombardment of the lithium target is very low, and the use performance of the neutron source lithium target is ensured.

Description

technical field [0001] The invention belongs to the field of neutron sources, and in particular relates to a neutron source lithium target, a preparation method thereof and a vehicle-mounted accelerator. Background technique [0002] The target system is one of the key components of the vehicle-mounted accelerator neutron source. Considering neutron yield and radioactive radiation and other issues, the use of linear accelerators to accelerate protons to bombard lithium or beryllium targets is the most suitable for small-scale accelerator neutron sources. For vehicle-mounted accelerator neutron sources, the proton linear accelerator must be controlled at a very low energy level (such as below 3.5 MeV) due to the limitation of weight, volume and high radiation shielding requirements. In this low energy range, the neutron yield of the lithium target is at least 2.5 times that of the beryllium target. in, 7 Li(p,n) 7 Be has a low reaction threshold energy of 1.88 MeV. Lithi...

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Problems solved by technology

At the same time, the lithium target will produce radionuclide Be-7 with a half-life of 53.4 days during the working process, which brings difficulties and challenges to the work of properly disposing of the waste target

In particular, the exposed solid lithium target may be oxidized and corroded by the air during production and storage, causing consequences such as loss of the lithium layer and reduction in yield.

At present, during the processing and use of lithium targets, a large glove box is required to match the coating device. During the preparation process of lithium targets, it cannot be mixed with H 2 O, N 2 , CO 2 and other contacts, which undoubtedly greatly increase the cost and complexity of the system

For example, the lithium target usually needs to be fixed on the substrate by hot isostatic pressing or other methods, but in the transfer process of the lithium target, in order to reduce the influence of the reactive gas on the lithium target, it is often necessary to combine the hot isostatic pressing equipment and the coating equipment Vacuum connection equipment is set between, which greatly increases the complexity and cost of the system

[0003] In summary, lithium targets have the problems of high chemical activity and low melting point

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