CN215575692U

CN215575692U - Liquid scintillator detector

Info

Publication number: CN215575692U
Application number: CN202121654993.6U
Authority: CN
Inventors: 张小东; 张少东; 周志波; 刘月壮; 林旭润; 李达; 武朝辉; 张琦
Original assignee: State Nuclear Security Technology Center; North China Electric Power University
Current assignee: State Nuclear Security Technology Center; North China Electric Power University
Priority date: 2021-07-20
Filing date: 2021-07-20
Publication date: 2022-01-18
Anticipated expiration: 2031-07-20

Abstract

The utility model discloses a liquid scintillator detector, which comprises a liquid scintillator container, a liquid scintillator, a sealing boss, a tubular shell, a plano-concave light guide lens, a photomultiplier tube and a bottom cover, wherein the liquid scintillator is arranged in the liquid scintillator container, the sealing boss is abutted against one end of the liquid scintillator container, the plano-concave light guide lens and the photomultiplier tube are both arranged in the tubular shell, the plane of the plano-concave light guide lens is abutted against the sealing boss, the end part of the photomultiplier tube is abutted against the concave surface of the plano-concave light guide lens, when a signal is detected, the liquid scintillator converts a neutron signal and a gamma signal into optical signals, the shapes of the optical signals are different, the optical signals are continuously transmitted backwards through the sealing boss and the plano-concave light guide, when the optical signals reach the photocathode of the photomultiplier tube, the photocathode converts the optical signals into electrical signals and amplifies the signals in the photomultiplier tube, so that the neutron signal and the gamma signal are more obviously distinguished, high-precision discrimination of neutron signals and gamma signals is realized.

Description

Liquid scintillator detector

Technical Field

The utility model relates to the technical field of liquid scintillator detectors, in particular to a liquid scintillator detector with neutron signal and gamma signal discrimination capability.

Background

With the development of the times, nuclear materials and nuclear technologies have been widely applied to the fields of energy, nuclear medicine, customs security inspection and the like. The probability of nucleus diffusion is also increasing due to the increased use of nuclear material. Non-destructive testing techniques for nuclear materials have also been developed in order to enhance the effective tracking and supervision of civil nuclear materials and the quality of radioactive materials extracted from spent fuel. Among nondestructive testing methods for nuclear materials, the neutron multiplicities measurement analysis method has been widely adopted internationally due to its advantages of high measurement speed, high measurement accuracy, no need of standard sample scales, and the like.

At the beginning of research, neutron multiplicities are mostly adopted³He tube detects thermal neutrons, but because³He tube is too expensiveExpensive, researchers began to replace liquid scintillator detectors with others³The He tube detects the neutrons. However, the liquid scintillator detector can detect not only neutron signals but also gamma signals, and therefore, in order to identify the neutron signals therein, the liquid scintillator detector needs to have high neutron signal and gamma signal discrimination capability.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a liquid scintillator detector with high discrimination capability of neutron signals and gamma signals.

In order to solve the technical problem, the liquid scintillator detector of the utility model comprises a liquid scintillator container, a liquid scintillator, a sealing boss, a tubular shell, a plano-concave light guide lens, a photomultiplier and a bottom cover, wherein:

an opening is formed at one end of the liquid scintillator container;

the liquid scintillator is arranged in the liquid scintillator container;

the sealing boss is abutted against one end of the liquid scintillator container, and the opening is completely covered by the sealing boss;

one end of the tubular shell is abutted against the sealing boss, and the other end of the tubular shell is connected with the bottom cover;

the plano-concave light guide lens and the photomultiplier are both arranged in the tubular shell, the plane of the plano-concave light guide lens is abutted to the sealing boss, and the end of the photomultiplier is abutted to the concave surface of the plano-concave light guide lens.

Optionally, the liquid scintillator detector further includes a light coupling agent, and the light coupling agent is disposed between the plane of the plano-concave light guide lens and the sealing boss, and between the end of the photomultiplier and the concave surface of the plano-concave light guide lens.

Optionally, the liquid scintillator detector further includes an air hose and a packaging barrel, a groove is formed in an outer side surface of the liquid scintillator container, the air hose is arranged in the groove, the packaging barrel is sleeved outside the liquid scintillator container, and the packaging barrel seals the groove.

Optionally, the inflation hose is arranged helically.

Optionally, the sealing boss is made of quartz glass.

Optionally, the liquid scintillator detector further comprises a metal wire, a V-shaped groove is formed at one end of the liquid scintillator container, the V-shaped groove is arranged around the opening, the metal wire is arranged in the V-shaped groove, and the sealing boss completely covers the V-shaped groove.

Optionally, the liquid scintillator detector further includes a clamp ring, the clamp ring is disposed between one end of the tubular housing and the sealing boss, one end of the tubular housing abuts against the sealing boss through the clamp ring, and the clamp ring is connected to the liquid scintillator container through a screw.

Optionally, the liquid scintillator detector further includes an annular rubber pad, the annular rubber pad is disposed in the tubular housing, and a joint between an end of the photomultiplier and a concave surface of the plano-concave light guide lens is located inside the annular rubber pad.

The utility model has the following effects: when the liquid scintillator detector is used for detecting nuclear materials, the nuclear materials are placed in front of the detector, the liquid scintillator detects neutron signals and gamma signals, the liquid scintillator converts the neutron signals and the gamma signals into optical signals when the signals are detected, the shapes of the signals are different, the optical signals sent by the liquid scintillator continue to be conducted backwards through the sealing boss and the flat concave light guide, when the optical signals reach the photocathode of the photomultiplier, the photocathode converts the optical signals into electric signals and amplifies the signals in the photomultiplier, and therefore the neutron signals and the gamma signals are distinguished more obviously, acquisition of the neutron signals is facilitated, and high-precision discrimination of the neutron signals and the gamma signals is achieved.

Drawings

FIG. 1 is a cross-sectional view of a liquid scintillator detector of the present invention;

fig. 2 is an enlarged schematic view of a in fig. 1.

Detailed Description

Example 1

A cross-sectional view of a liquid scintillator detector of the present invention is shown in fig. 1. Liquid scintillator detector, including liquid scintillator container 1, liquid scintillator 2, sealed boss 3, tubular casing 4, plano-concave light guide lens 5, photomultiplier 6 and bottom 7, wherein, liquid scintillator container 1 is cylindric, and the one end of liquid scintillator container 1 is formed with the opening, and liquid scintillator 2 is built in liquid scintillator container 1, and sealed boss 3 is then the butt in the one end of liquid scintillator container 1, and the opening of liquid scintillator container 1 is shielded completely to sealed boss 3. It is to be noted that, in the present embodiment, the sealing boss 3 is stepped, that is, the inner layer of the sealing boss 3 is embedded in the opening of the liquid scintillator container 1, and the outer layer of the sealing boss 3 abuts against the end of the liquid scintillator container 1. The material of the sealing boss 3 is quartz glass with high light transmittance.

Further, one end of the tubular housing 4 of the present embodiment abuts against the sealing boss 3, the other end of the tubular housing 4 is connected to the bottom cover 7, and three holes are opened on the bottom cover 7 for accessing the circuit inside the tubular housing 4. The plano-concave light guide lens 5 and the photomultiplier tube 6 are both disposed in the tubular case 4, the plane of the plano-concave light guide lens 5 abuts against the seal boss 3, and the end of the photomultiplier tube 6 abuts against the concave surface of the plano-concave light guide lens 5. It is worth noting that optical coupling agents are arranged between the plane of the plano-concave light guide lens 5 and the sealing boss 3 and between the end of the photomultiplier tube 6 and the concave surface of the plano-concave light guide lens 5, so that the light transmittance of the whole system is ensured.

The specific process and principle for discriminating the neutron signal and the gamma signal by adopting the liquid scintillator 2 detector provided by the utility model are as follows: the nuclear material is placed in front of the detector, at the moment, the liquid scintillator 2 can detect neutron signals and gamma signals, when the signals are detected, the liquid scintillator 2 can convert the neutron signals and the gamma signals into optical signals, the shapes of the signals are different, the optical signals sent by the liquid scintillator 2 can be conducted backwards continuously through the sealing bosses and the flat concave light guides, when the optical signals reach the photocathode of the photomultiplier tube 6, the photocathode can convert the optical signals into electric signals and amplify the signals in the photomultiplier tube 6, the neutron signals and the gamma signals are distinguished more obviously, the acquisition of the neutron signals is facilitated, and the high-precision discrimination of the neutron signals and the gamma signals is realized.

Example 2

As still another embodiment of the present invention, it is different from embodiment 1 in that: the detector for the liquid scintillator 2 of the embodiment further comprises an inflatable hose 8 and a packaging barrel 9, wherein a groove is formed in the outer side face of the liquid scintillator container 1, the inflatable hose 8 is arranged in the groove, the packaging barrel 9 is sleeved outside the liquid scintillator container 1, and the packaging barrel 9 seals the groove. It is noted that the inflation hose 8 of this embodiment is endlessly connected and is helically wound in a groove, as shown in fig. 1. The gas-filled hose 8 may be compressed when the liquid scintillator 2 expands in volume at an elevated temperature, and may also tighten the liquid scintillator container 1 when the liquid scintillator 2 becomes smaller in volume at a lowered temperature. Correspondingly, liquid scintillator container 1 can outwards take place deformation when the inside liquid scintillator 2 of temperature rise expands, prevents that liquid scintillator 2 from overflowing from sealed boss 3, can compress tightly inwards deformation by gas hose 8 when the temperature reduces the volume of liquid scintillator 2 again, prevents that the air from getting into liquid scintillator 2 from sealed boss 3.

Example 3

As another embodiment of the present invention, it is different from the previous embodiment in that: the liquid scintillator 2 detector of this embodiment still includes wire 10, and the one end of liquid scintillator container 1 is formed with the V-arrangement groove, and the V-arrangement groove encircles the opening setting, places the V-arrangement groove in the wire 10 in, and sealed boss 3 completely hides the V-arrangement groove, as shown in fig. 2. The metal wire 10 is adopted for compressing and sealing, so that the sealing effect can be ensured, and meanwhile, the liquid scintillator 2 can be prevented from being corroded.

Example 4

As another embodiment of the present invention, it is different from the previous embodiment in that: the liquid scintillator 2 detector of this embodiment still includes clamp ring 11, and clamp ring 11 sets up between the one end of tubular casing 4 and sealed boss 3, and clamp ring 11 butt sealed boss 3 is passed through to the one end of tubular casing 4, and clamp ring 11 passes through bolted connection liquid scintillator container 1.

Example 5

As another embodiment of the present invention, it is different from the previous embodiment in that: the liquid scintillator 2 detector of the present embodiment further includes an annular rubber pad 12, the annular rubber pad 12 is disposed in the tubular housing 4, and a junction between the end of the photomultiplier tube 6 and the concave surface of the plano-concave light guide lens 5 is located inside the annular rubber pad 12. The device of the present invention is not limited to the embodiments of the specific embodiments, and other embodiments can be derived by those skilled in the art from the technical solutions of the present invention, and the device of the present invention also belongs to the technical innovation and protection scope of the present invention.

Claims

1. A liquid scintillator detector, comprising: including liquid scintillator container, liquid scintillator, sealed boss, tubulose casing, plano-concave light guide lens, photomultiplier and bottom, wherein:

an opening is formed at one end of the liquid scintillator container;

the liquid scintillator is arranged in the liquid scintillator container;

2. The liquid scintillator detector as claimed in claim 1, wherein: the optical coupling agent is arranged between the plane of the plano-concave light guide lens and the sealing boss and between the end part of the photomultiplier and the concave surface of the plano-concave light guide lens.

3. The liquid scintillator detector as in claim 1, wherein: still include inflatable hose and a packaging section of thick bamboo, the lateral surface of liquid scintillator container is seted up flutedly, place in inflatable hose in the recess, the packaging section of thick bamboo cover is established the outside of liquid scintillator container, a packaging section of thick bamboo seals the recess.

4. The liquid scintillator detector as claimed in claim 3, wherein: the inflation hose is spirally arranged.

5. The liquid scintillator detector as claimed in claim 1, wherein: the sealing boss is made of quartz glass.

6. The liquid scintillator detector as in any one of claims 1 to 5, wherein: still include the wire, the one end of liquid scintillator container is formed with the V-arrangement groove, the V-arrangement groove encircles the opening sets up, place in the wire the V-arrangement groove, sealed boss hides completely the V-arrangement groove.

7. The liquid scintillator detector as in any one of claims 1 to 5, wherein: still include the clamp ring, the clamp ring sets up tubular casing's one end with between the sealed boss, tubular casing's one end is passed through the clamp ring butt sealed boss, the clamp ring passes through the screw connection liquid scintillator container.

8. The liquid scintillator detector as in any one of claims 1 to 5, wherein: the photomultiplier tube is characterized by further comprising an annular rubber pad, the annular rubber pad is arranged in the tubular shell, and the joint of the end of the photomultiplier tube and the concave surface of the plano-concave light guide lens is located inside the annular rubber pad.