阅读说明：本技术 一种球型6LiF中子探测器及探测方法 (Ball type6LiF neutron detector and detection method ) 是由 张志勇 刘思平 于 2020-05-26 设计创作，主要内容包括：本发明公开了一种球型<Sup>6</Sup>LiF中子探测器及探测方法,包括光电倍增管和球形有机玻璃,所述球形有机玻璃的表面设有丝印层,球形有机玻璃正对光电倍增管的一侧加工成内凹型的光收集面,光收集面的形状满足光电倍增管的插入,本发明的有益效果是：1、工艺简单、生产产品的一致性好、成本低。2、光电倍增光用硅油固定于有机玻璃中即可,模块式设计,结构更紧凑,维护更方便通用性更强。(The invention discloses a spherical ball 6 The LiF neutron detector comprises a photomultiplier and spherical organic glass, wherein a silk screen layer is arranged on the surface of the spherical organic glass, one side of the spherical organic glass, which is opposite to the photomultiplier, is processed into an inward concave light collecting surface, and the shape of the light collecting surface meets the insertion of the photomultiplier, so that the invention has the beneficial effects that: 1. simple process, good consistency of the produced products and low cost. 2. The photomultiplier is fixed in organic glass with silicon oil can, modular design, the structure is compacter, it is stronger to maintain more convenient commonality.)

1. Ball type⁶LiF neutron detector, including photomultiplier (3) and spherical organic glass (1), its characterized in that, the surface of spherical organic glass (1) is equipped with silk screen printing layer (2), and spherical organic glass (1) just processes into concave light collection face (5) to one side of photomultiplier (3), and the shape of light collection face (5) satisfies the insertion of photomultiplier (3).

2. The spherical 6LiF neutron detector of claim 1, wherein the silk-screen layer (2) is⁶And (4) LiF + ZnS silk-screen layer.

3. A ball according to claim 2⁶The LiF neutron detector is characterized in that the silk-screen printing layer (2) is composed of⁶LiF and ZnS powders were mixed uniformly at a ratio of 2:1 and screen printed.

4. A ball according to claim 3⁶LiF neutron detector, characterized in that, printing thickness 0.5 mm.

5. A ball according to claim 4⁶The LiF neutron detector is characterized in that after printing is completed, the LiF neutron detector needs to be baked for 2 hours at a constant temperature of 40 ℃ for curing.

6. A ball according to claim 5⁶The LiF neutron detector is characterized in that after baking is finished, the light collecting surface of the electron multiplier tube is coated with silicone oil.

7. Ball type⁶The detection method of the LiF neutron detector is characterized in that when neutron rays act on silk screen, the silk screen is printed with⁶When the spherical neutron detector of LiF + ZnS is used, nuclear reaction occurs to generate α rays with high energy, while ZnS is sensitive to α particles, and completely converts α particles into photons which pass throughThe organic glass reaches the photomultiplier, the photomultiplier converts an optical signal into an electric signal, the whole detection process is completed by matching with a preamplifier, an operational amplifier, a comparator and a counter, the comparator mainly screens n/gamma, the gamma signal can be inhibited, the neutron signal can completely pass through, and then the counter completes the calculation of the number of neutrons.

Technical Field

The invention relates to the technical field of detectors, in particular to a spherical detector⁶Provided are a LiF neutron detector and a detection method.

Background

Neutron detectors refer to a class of detectors that can detect neutrons. Neutrons are not charged themselves and cannot be ionized or excited, so they cannot be detected directly with ordinary detectors. The existing neutron detectors are of the type of He-3 gas (spherical, cylindrical and planar),¹⁰B solid (planar),⁶LiF solid (plane shape) and lithium glass solid (plane shape) are mostly dependent on import, and have the advantages of higher cost, smaller neutron reaction sectional area, low sensitivity or relatively narrow neutron detection energy range.

Lithium glass is used as a detector for a partial neutron detector, the structure of fixed glass is complex due to the fact that the lithium glass is difficult to process, if the lithium glass is cut into partial pentagons and partial hexagons, the lithium glass is attached to organic glass with polygonal surfaces in a football ball skin splicing mode and spliced into approximate spheres, and by adopting the mode, the splicing is very difficult, the cost is high, the consistency is poor, the maintenance is difficult, and the lithium glass is not beneficial to standardization and modular rapid production and manufacturing.

Disclosure of Invention

The invention aims to provide a spherical 6LiF neutron detector and a detection method, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

ball type⁶LiF neutron detector, including photomultiplier and spherical organic glass, spherical organic glass's surface is equipped with the silk screen printing layer, and spherical organic glass just processes into the light collection face of concave type to one side of photomultiplier, and the shape of light collection face satisfies photomultiplier's insertion.

As a further scheme of the invention: the silk screen printing layer is⁶And (4) LiF + ZnS silk-screen layer.

As a further scheme of the invention: the silk screen printing layer 2 is composed of⁶LiF and ZnS powders were mixed uniformly at a ratio of 2:1 and screen printed.

As a further scheme of the invention: the printing thickness is 0.5 mm.

As a further scheme of the invention: after the printing is finished, the printing needs to be baked for 2 hours at a constant temperature of 40 ℃ for curing.

As a further scheme of the invention: after baking, the light collecting surface of the electron multiplier tube is coated with silicone oil.

Ball type⁶The detection method of the LiF neutron detector is characterized in that when neutron rays act on silk screen, the silk screen is printed with⁶The spherical neutron detector of LiF + ZnS is subjected to nuclear reaction to generate α rays with high energy, the ZnS is sensitive to α particles, α particles are completely converted into photons, the photons reach the photomultiplier through organic glass, the photomultiplier converts optical signals into electric signals, the whole detection process is completed by matching with a preamplifier, an operational amplifier, a comparator and a counter, the comparator mainly discriminates n/gamma, the gamma signals can be inhibited, the neutron signals completely pass through, and then the counter completes the calculation of the number of neutrons.

Compared with the prior art, the invention has the beneficial effects that: 1. simple process, good consistency of the produced products and low cost. 2. The photomultiplier is fixed in organic glass with silicon oil can, modular design, the structure is compacter, it is stronger to maintain more convenient commonality.

Drawings

FIG. 1 is a block diagram of the system of the present invention.

In the figure: 1-spherical organic glass; 2. screen printing layer; 3. a photomultiplier tube; 4. neutron rays; 5. a light collection surface.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, embodiment 1: in the embodiment of the invention, the spherical ball⁶LiF neutron detector, including photomultiplier 3 and spherical organic glass 1, spherical organic glass 1's surface is equipped with silk screen printing layer 2, and spherical organic glass 1 just processes into the light collection face 5 of concave type to one side of photomultiplier 3, and the shape of light collection face 5 satisfies photomultiplier 3's insertion. Wherein the silk-screen printing layer 2 is⁶LiF + ZnS silk-screen layer, the silk-screen layer 2 is composed of⁶LiF and ZnS powder are uniformly mixed according to the ratio of 2:1, the mixture is prepared by screen printing, the printing thickness is 0.5mm, after the printing is finished, the mixture needs to be baked for 2 hours at the constant temperature of 40 ℃ for solidification, and after the baking is finished, the light collecting surface of the photomultiplier is coated with silicone oil.

The neutron itself is not charged, and there is no coulomb repulsion between it and the atomic nucleus in the substance, so it is easier to enter the atomic nucleus and take nuclear reaction. Neutrons can be detected by selecting nuclear reactions that produce charged particles and recording ionization phenomena caused by the charged particles. The invention uses nuclear reaction method to detect neutron, the nuclear reaction is as follows:

n+⁶LiF→α+³t +4.786MeV is thus seen⁶The (n, α) reaction of LI emits large energy, n/gamma is easily distinguished, and measurement is easier.

As can be seen from the figure, neutrons from all directions of the detection surface of the detector can be detected. The spherical rule can improve the detection stability and reduce the uncertainty of the ray direction; the structure is modularized, and the method is simple and beneficial to batch production.