CN215494161U

CN215494161U - High-stability transmission-type monitoring ionization chamber

Info

Publication number: CN215494161U
Application number: CN202121577338.5U
Authority: CN
Inventors: 苏凌泉; 赵继荣; 公冶韩泽; 李凯伦; 王延伟
Original assignee: China Inspection Putai Inspection And Testing Co ltd
Current assignee: China Inspection Putai Inspection And Testing Co ltd
Priority date: 2021-07-12
Filing date: 2021-07-12
Publication date: 2022-01-11
Anticipated expiration: 2031-07-12

Abstract

The utility model discloses a high-stability transmission-type monitoring ionization chamber, and belongs to the technical field of accelerators. Including casing, last casing, high-voltage pole, collector, protective pole and insulator down, high-voltage pole and collector are circular structure, and the high-voltage pole has two, and the collector presss from both sides in the middle of two high-voltage poles, protective pole and insulator are the annular shape, and the protective pole setting is in the collector outside, and the insulator setting is in the protective pole outside, the casing is ring shape down, and its inboard is provided with the recess, and two high-voltage poles centre gripping protective pole, insulator and collector are fixed under in the recess of casing, it passes through the nut and fixes under on the casing to go up the casing. The utility model has lower cost and better stability, can normalize the measured value of the beam dose of the accelerator, ensures that the stability of the beam dose penetrating through the ionization chamber is greatly improved after normalization, and can be used for establishing a stable calibration radiation field of the ionization chamber.

Description

High-stability transmission-type monitoring ionization chamber

Technical Field

The utility model belongs to the technical field of accelerators, and particularly relates to a high-stability transmission-type monitoring ionization chamber.

Background

The radiation field is established by the accelerator to calibrate the stability of the ionization chamber, theoretically, the beam of the accelerator is extremely stable, the stability of most accelerators is difficult to meet the requirement, data shows that the establishment of the standard field for calibrating the ionization chamber needs to consume huge capital and needs to be verified for a long time, and the standard field cannot be popularized on a large scale.

The transmission ionization chamber is generally used for monitoring the output dose rate or accumulated dose of an accelerator on line, and mainly aims at radiation which has small mass collision prevention capability in a medium, negligible energy loss and no influence on rear-end measurement, such as X rays, photons, high-energy electron beams and the like. A high-stability transmission-type monitoring ionization chamber is arranged below an accelerator head to monitor and normalize the beam of the accelerator and correct the beam dose of the accelerator to a certain extent, so that the accelerator with poor stability can meet the stability requirement of a radiation field for calibration.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to a highly stable transmission-type monitoring ionization chamber, which solves the above-mentioned problems of the prior art.

The technical scheme adopted by the utility model is as follows:

the utility model provides a high stable transmission-type monitoring ionization chamber, includes casing 1 down, goes up casing 2, high-voltage electrode 3, collector 4, protective electrode 5 and insulator 6, high-voltage electrode 3 and collector 4 are circular structure, and high-voltage electrode 3 has two, and collector 4 presss from both sides in the middle of two high-voltage electrode 3, protective electrode 5 and insulator 6 are the ring shape, and protective electrode 5 sets up in the collector 4 outside, and insulator 6 sets up in the protective electrode 5 outside, casing 1 is the ring shape down, and its inboard is provided with the recess, and two high-voltage electrodes 3 are holding protective electrode 5, insulator 6 and collector 4 and are being fixed under in casing 1's recess, it passes through the nut and fixes under on casing 1 to go up casing 2.

The high-voltage electrode 3 and the collector 4 are both made of graphite materials, the thickness of the high-voltage electrode 3 is 2mm, the thickness of the collector 4 is 2mm, and the distance between the high-voltage electrode 3 and the collector 4 is 5 mm.

The guard electrode 5 is made of aluminum, and has a thickness of 6mm and a width of 5 mm.

The upper shell 2 is of a square structure, a round hole is formed in the middle of the upper shell, and the upper shell is made of hard aluminum.

The insulator 6 is made of transparent organic glass.

And a groove is formed in the side surface of the collector 4, is opposite to the upper insulator 61 and the threading holes in the lower shell 1, and is used for fixing a cable.

The insulator 6 is composed of an upper insulator 61 and a lower insulator 62, a groove is arranged inside the upper insulator 61, the protective electrode 5 is positioned in the groove of the upper insulator 61, and the lower insulator 62 is positioned at the lower side of the protective electrode 5.

The upper shell 2 is adapted to the accelerator head and can be arranged at the accelerator head for a long time without influencing the normal use of the accelerator.

There are three insulating columns 7 between collector 4 and protective electrode 5, the both ends head diameter of insulating column 7 is greater than its middle section diameter, and its middle section does not contact with any place, has greatly increased the creepage distance between collector 4 and protective electrode 5, has guaranteed the insulating effect of collector 4 and protective electrode 5.

In summary, due to the adoption of the technical scheme, the utility model has the beneficial effects that:

the high-voltage electrode of the utility model adopts a high-purity graphite plate, has larger thickness, better physical and chemical properties than an organic glass film graphite-coated structure, better stability, larger sensitive volume of an ionization chamber on the basis of containing the range of the accelerator beam and high detection capability on the accelerator beam; after the ionization chamber is detected, a normalized value can be output by a special system, so that the ionization chamber is visual and clear; the ionization chamber shell is matched with the accelerator, so that the position repeatability is good; the special design is carried out under the accelerator, and the cost is lower on the basis of meeting the technical requirements; in order to reduce the leakage current between the electrodes, transparent organic glass is selected as an insulating material to isolate the electrodes, so that data distortion caused by the generation of the leakage current is effectively avoided; the measured value of the beam dose of the accelerator can be normalized, the stability of the beam dose penetrating through the ionization chamber after normalization is greatly improved, and the method can be used for establishing a calibration radiation field of the stability of the ionization chamber.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic structural view of the lower housing of the present invention;

FIG. 3 is a schematic structural view of the upper housing of the present invention;

FIG. 4 is a schematic diagram of a high voltage electrode of the present invention;

the labels in the figure are: a lower case 1; an upper case 2; a high voltage electrode 3; a collector 4; a guard electrode 5; an insulator 6; and an insulating column 7.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments and accompanying drawings further illustrate the present invention in detail.

Example 1

The utility model provides a high stable transmission-type monitoring ionization chamber, as shown in fig. 1 to 4, includes casing 1, upper housing 2, high-voltage pole 3, collector 4, protective electrode 5 and insulator 6 down, high-voltage pole 3 and collector 4 are circular structure, and high-voltage pole 3 has two, and collector 4 presss from both sides in the middle of two high-voltage poles 3, protective electrode 5 and insulator 6 are the ring shape, and protective electrode 5 sets up the collector 4 outside between two high-voltage poles 3, fixes collector 4, and insulator 6 sets up the protective electrode 5 outside between two high-voltage poles 3, separates upper and lower two high-voltage poles 3 and protective electrode 5, casing 1 is the ring shape down, and its inboard is provided with the recess, and two high-voltage poles 3 are holding protective electrode 5, insulator 6 and collector 4 and are fixed in the recess of casing 1 down, upper housing 2 passes through the nut and fixes on casing 1 down. The leads are led to the high voltage pole 3 and the collector 4 by means of perforations. The upper shell 2 is adapted to the accelerator head and can be arranged at the accelerator head for a long time without influencing the normal use of the accelerator.

The guard electrode 5 is made of aluminum, and has a thickness of 6mm and a width of 5 mm. The protective electrode 5 is used for reducing leakage current from the high-voltage electrode to the collector and correcting the fringe electric field of the high-voltage electrode and the collector.

Insulator 6 is made by transparent organic glass, and insulator 6 made by transparent organic glass possesses very high stability and easy processing nature, can avoid the measuring error that the electric leakage caused between the electrode.

Example 2

On the basis of embodiment 1, the upper shell 2 is of a square structure, a round hole is formed in the middle of the upper shell, and the upper shell is made of hard aluminum. The main effect of casing and last casing is the position of fixed high-voltage pole and insulator down, bears the cable interface simultaneously and makes whole ionization chamber ground connection, goes up the casing and is a square hard aluminum plate similar to preceding pointer board with the accelerator adaptation, and the round hole that the centre set up makes the beam shoot directly on the high-voltage pole, and the recess that sets up in the middle of the casing down is used for fixing the inside part of ionization chamber, and upper and lower two parts are connected, are fixed with the nut.

Example 3

On the basis of embodiment 1, a groove is provided on the side surface of the collector 4, and the groove is opposite to the threading holes on the upper insulator 61 and the lower shell 1 and is used for fixing the cable. The signal collection wire is fixed in the groove through a fastener, so that the purpose of leading out signals is achieved.

Example 4

In addition to embodiment 1, the insulator 6 is composed of an upper insulator 61 and a lower insulator 62, a groove is provided inside the upper insulator 61, the guard electrode 5 is located in the groove of the upper insulator 61, and the lower insulator 62 is located below the guard electrode 5.

Example 5

On the basis of embodiment 1, be provided with three insulating column 7 between collector 4 and protective electrode 5, the both ends head diameter of insulating column 7 is greater than its middle section diameter, and the less middle section of its diameter does not contact with everywhere, has greatly increased the creepage distance between collector 4 and protective electrode 5, has guaranteed the insulating effect of collector 4 and protective electrode 5.

The using method of the utility model comprises the following steps: 1. the connecting cable of the monitoring ionization chamber penetrates out of the accelerator irradiation chamber to the control chamber; 2. the whole device of the monitoring ionization chamber is placed in a front pointer clamping groove below an accelerator head, and the device is pushed into the clamping groove forcefully until the sound of the clamping groove is heard; 3. and connecting the connecting cable with a control computer, starting control software, monitoring the output dosage of the accelerator through the software, and normalizing.

The above description is only exemplary of the utility model, and any modification, equivalent replacement, and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. The utility model provides a high stable transmission-type monitoring ionization chamber, includes casing (1) down, goes up casing (2), high-voltage pole (3), collector (4), guard electrode (5) and insulator (6), its characterized in that: high-voltage pole (3) and collector (4) are circular structure, and high-voltage pole (3) have two, and collector (4) clamp is in the middle of two high-voltage poles (3), protective electrode (5) and insulator (6) are the annular shape, and protective electrode (5) set up in the collector (4) outside, and insulator (6) set up in the protective electrode (5) outside, casing (1) is the ring shape down, and its inboard is provided with the recess, and protective electrode (5), insulator (6) and collector (4) are being fixed under in the recess of casing (1) to two high-voltage poles (3) centre gripping, go up casing (2) and pass through the nut and fix under on casing (1).

2. The high stability transmission monitor ionization chamber of claim 1, wherein: the high-voltage electrode (3) and the collector (4) are both made of graphite materials, the thickness of the high-voltage electrode (3) is 2mm, the thickness of the collector (4) is 2mm, and the distance between the high-voltage electrode (3) and the collector (4) is 5 mm.

3. The high stability transmission monitor ionization chamber of claim 1, wherein: the protective electrode (5) is made of aluminum materials, the thickness of the protective electrode is 6mm, and the width of the protective electrode is 5 mm.

4. The high stability transmission monitor ionization chamber of claim 1, wherein: the upper shell (2) is of a square structure, a round hole is formed in the middle of the upper shell, and the upper shell is made of hard aluminum.

5. The high stability transmission monitor ionization chamber of claim 1, wherein: the insulator (6) is made of transparent organic glass.

6. The high stability transmission monitor ionization chamber of claim 1, wherein: the side surface of the collector (4) is provided with a groove, and the groove is opposite to the upper insulator (61) and the threading holes in the lower shell (1) and is used for fixing a cable.

7. The high stability transmission monitor ionization chamber of claim 1, wherein: the insulator (6) is composed of an upper insulator (61) and a lower insulator (62), a groove is formed in the inner side of the upper insulator (61), the guard electrode (5) is located in the groove of the upper insulator (61), and the lower insulator (62) is located on the lower side of the guard electrode (5).

8. The high stability transmission monitor ionization chamber of claim 1, wherein: the upper housing (2) is adapted to an accelerator head.

9. The high stability transmission monitor ionization chamber of claim 1, wherein: three insulating columns (7) are arranged between the collector (4) and the protective electrode (5), and the diameters of two end heads of the insulating columns (7) are larger than the diameter of the middle section of the insulating columns.