A gamma ray detection ionization chamber with annular stacked collector

Abstract

The application discloses a circular laminated collector gamma ray detection ionization chamber, which comprises an ionization chamber shell, a collector, an insulator and an ionization chamber base, the bottom of the ionization chamber shell is connected with the ionization chamber base, and the whole forms a cylindrical type, the insulator is installed at the center of the ionization chamber base, the collector comprises three collector rings, the collector rings are coaxial with the ionization chamber shell and are arranged in an axial direction, the three collector rings are connected through connecting rods on two sides, the collector ring at the bottom is connected with an extraction electrode, the extraction electrode extends out of the insulator and is connected with a cable connector. The gamma ray detection ionization chamber improves the measurement of radiation dose rate and measurement accuracy.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of gamma radiation detection technology, and particularly relates to a gamma radiation detection ionization chamber with annular stacked collecting electrodes. BACKGROUND

[0002] An ionization chamber is a detector for measuring ionizing radiation by using the ionization effect of ionizing radiation. The ionization chamber is composed of electrodes at different potentials and the medium therebetween. Ionizing radiation generates ion pairs in the medium, and under the action of an electric field, positive and negative ions drift to the negative and positive electrodes respectively, forming an ionization current. Since the ionization current is proportional to the intensity of the radiation, measuring the current can obtain the intensity of the ionizing radiation. According to the type of medium, the ionization chamber can be divided into air ionization chambers, liquid ionization chambers and solid ionization chambers, etc. According to the measurement method, the ionization chamber can be divided into pulse-type ionization chambers and current-type ionization chambers. According to the structure, the ionization chamber can be divided into cylindrical ionization chambers and flat plate ionization chambers. For the existing cylindrical ionization chamber, the collection efficiency is not high enough.

[0003] For example, Chinese patent CN202533587U discloses an ionization chamber type detector for measuring strong gamma radiation field under accident conditions, which comprises a cylindrical stainless steel ionization chamber probe and a cable. The stainless steel ionization chamber probe is composed of an outer shell and an inner shell of coaxial thin-walled stainless steel sealing structure, and the inner layer collecting electrode of the inner shell is a hollow aluminum cylinder. Although the collecting electrode adopts a hollow cylindrical structure, it adopts a very small electrode spacing, which is intended to meet the lower range limit and the extremely high measurement upper limit, and does not solve the problem of insufficient collection efficiency. SUMMARY

[0004] The present application aims to provide a gamma radiation detection ionization chamber with annular stacked collecting electrodes to solve the above problems.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0006] A gamma radiation detection ionization chamber with annular stacked collecting electrodes comprises an ionization chamber shell, a collecting electrode, an insulator and an ionization chamber base. The bottom of the ionization chamber shell is connected to the ionization chamber base, and the whole constitutes a cylindrical type. The insulator is installed at the center of the ionization chamber base. The collecting electrode comprises three collecting rings, which are coaxial with the ionization chamber shell and arranged along the axial direction. The three collecting rings are connected by connecting rods on both sides. The bottom collecting ring is connected to an extraction electrode, which extends out of the insulator and is connected to a cable connector.

[0007] Further, the material of the ionization chamber shell is aluminum alloy, and the wall thickness is 0.3 mm. The collecting rings and the connecting rods are both aluminum wires with a diameter of 1 mm. The extraction electrode is a copper wire with a diameter of 2 mm.

[0008] Furthermore, the diameter of the collecting ring is 28 mm; the diameter of the ionization chamber shell is 35 mm.

[0009] The beneficial effects of this invention are:

[0010] The collecting electrode used in this invention is made of three layers of 1mm pure aluminum wire in a ring shape, which reduces the distance between the collecting electrode of the ionization chamber and the electrode to which the polarization voltage is applied. Under the same polarization voltage, compared with the traditional single-column collecting electrode, it effectively reduces the recombination loss of ionized ions before reaching the collecting electrode, and its collection efficiency is increased by 120%. Under the same polarization voltage and collection efficiency, the measurable radiation dose rate is increased by 220%. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of a ring-shaped stacked collecting electrode gamma-ray detection ionization chamber provided in an embodiment of the present invention;

[0012] The reference numerals in the figure include: 1. Ionization chamber shell; 2. Collecting electrode; 3. Insulator; 4. Ionization chamber base; 21. Collecting ring; 22. Connecting rod; 23. Lead-out electrode. Detailed Implementation

[0013] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments:

[0014] like Figure 1 The diagram shows an annular stacked collecting electrode ionization chamber for gamma-ray detection. This is a ventilated, unsealed ionization chamber, comprising an ionization chamber shell 1, collecting electrodes 2, insulators 3, and an ionization chamber base 4. The ionization chamber shell 1 is made of aluminum alloy, with a diameter of 35 mm and a wall thickness of 0.3 mm. The bottom of the ionization chamber shell 1 is fixedly connected to the ionization chamber base 4, and the overall structure is cylindrical. The insulator 3, made of polytetrafluoroethylene (PTFE), is installed at the center of the ionization chamber base 4. The collecting electrode 2 includes three collecting rings 21, each with a diameter of 28 mm. The collecting rings 21 are coaxial with the ionization chamber shell 1 and spaced apart axially. The three collecting rings 21 are connected by connecting rods 22 on both sides. Both the collecting rings 21 and the connecting rods 22 are made of 1 mm diameter aluminum wire. The bottom collecting ring 21 is connected to an output electrode 23, which extends out of the insulator 3 and connects to a cable connector. The output electrode 23 is made of 2 mm diameter copper wire.

[0015] The ionization chamber is in a gamma radiation field, the space between the ionization chamber shell 1 and the collecting electrode 2 is communicated with the outside, the ionization chamber shell 1 is a high voltage stage, after a polarized high voltage is applied to the ionization chamber shell 1, the electric charges generated by the interaction of the gamma rays and the gas between the collecting electrode 2 and the ionization chamber shell 1 move to the two electrodes, the current signal proportional to the radiation dose rate is output in the cable connected with the extracting electrode 23, the cable is connected with an electrometer or a weak current measuring system, by measuring the current signal, multiplying the sensitivity factor and the ion recombination correction factor, the gamma ray air kerma value at the measuring point can be obtained.

[0016] The above is only the embodiment of the present application, and the specific technical solutions and / or common knowledge of the scheme are not described in detail. It should be pointed out that for those skilled in the art, without departing from the technical solutions of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, and these will not affect the effect and practicality of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like recorded in the specification can be used to explain the content of the claims.

Claims

1. A gamma-ray detecting ionization chamber with annular stack collector, comprising an ionization chamber housing (1), a collector (2), an insulator (3) and an ionization chamber base (4), characterized in that: The bottom of the ionization chamber shell (1) is connected with an ionization chamber base (4), and the whole constitutes a cylindrical type, the insulator (3) is installed in the center of the ionization chamber base (4), the collector (2) comprises three collecting rings (21), the collecting rings (21) are coaxial with the ionization chamber shell (1) and are arranged in axial direction, the three collecting rings (21) are connected through connecting rods (22) on both sides, the bottom collecting ring (21) is connected with an extraction electrode (23), the extraction electrode (23) extends out of the insulator (3) and is connected with a cable joint.

2. A gamma-ray detection ionization chamber of the type comprising a ring-shaped stack of collector electrodes according to claim 1, characterized in that: The material of the ionization chamber shell (1) is aluminum alloy, the wall thickness is 0.3mm; the collecting ring (21) and the connecting rod (22) are all aluminum wires with a diameter of 1mm; the extraction electrode (23) is a copper wire with a diameter of 2mm.

3. A gamma-ray detection ionization chamber of the type comprising a circular stack of electrodes according to claim 2, characterized in that: The diameter of the collecting ring (21) is 28mm; the diameter of the ionization chamber shell (1) is 35mm.

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