Neutron detector based on thick gem and multilayer boron-coated mesh

Abstract

The invention discloses a multilayer net boron-coating thick GEM (Gas Electron Multiplier) neutron detector, which comprises a drifting electrode and a reading electrode, wherein the drifting electrode and the reading electrode are arranged in parallel side by side; a neutron transformation body is arranged between the drifting electrode and the reading electrode in parallel; the neutron transformation body comprises at least one layer of metal net; the surface of the metal net is coated with boron; the surface, which faces the reading electrode, of the drifting electrode is coated with the boron; a thick gas GEM is arranged between the neutron transformation body and the drifting electrode in parallel. According to the multilayer net boron-coating thick GEM neutron detector disclosed by the invention, a transformation area and a multiplication area are separated, the transformation area can be based on a plurality of boron-coating metal substrates, neutron detection efficiency can begreatly improved, no expensive boron 10 materials are wasted, the thick GSM of the multiplication area is durable, and gain can be easily controlled.

Description

technical field [0001] The present disclosure generally relates to neutron detection technology, and in particular to a neutron detector based on thick GEM and multilayer boron-coated mesh. Background technique [0002] Neutron detectors are widely used in radiation monitoring and neutron imaging. With the improvement of the performance of the new generation of neutron scientific devices, new challenges are posed to the development of neutron detectors, and the detection efficiency is the most important performance index of neutron detectors. [0003] Since neutrons are not charged, the cross section of reaction with matter is extremely low. The boron-coated neutron detector based on GEM has the following detection principle: firstly, a boron-coated conversion layer is needed, and the neutron is converted into 7 Li, α ions, and those emitted from the boron layer 7 Li and α ions will be ionized in the gas to generate primary electrons. Under the action of an electric field...

AI Technical Summary

Problems solved by technology

[0005] First, it is difficult to plate boron on the surface of GEM, and it will affect the performance of GEM film

The surface of the GEM film is copper, and the thickness is only 70um. The boron plating process requires special protection and tensioning treatment for the GEM film, and it is difficult to realize it in the coating room when the area is large.

In addition, the pore size of the GEM membrane is 50um, so it is easy to pollute the micropores of the GEM membrane during boron plating, which will inevitably affect the performance of the GEM membrane and greatly increase the probability of ignition damage.

[0006] Second, the GEM membrane is easily damaged, which will cause the expensive boron 10 material on the surface of the GEM membrane to be wasted

The purification process of boron 10 is difficult, so boron 10 is expensive, and it needs to be purchased through foreign channels

If a GEM membrane is damaged, the boron 10 material plated on it will be wasted, and this kind of waste is unaffordable for general laboratories

[0007] Third, the improvement of detection efficiency is limited

Therefore, in general, the improvement of detection efficiency is very limited.

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