CN2591644Y - Penetration ionization chamber for monitoring X-ray source dosage rate - Google Patents

Abstract

A penetrating ionization chamber for X-ray source dose rate monitoring includes a lower shell and an upper shell. In the lower shell, there are arranged multi-layer electrode insulation plates, two-layer electrode plates, protective rings and leaf springs that can fix the above-mentioned electrode plates, protective rings and multi-layer electrode insulation plates from bottom to top. The upper casing is fixed with the lower casing by screws to form a sensitive area, an inflation and exhaust area and a wiring area. The set air tube passes through the lower casing and leads to the sensitive area. Its structural feature is that a protective cover is provided on the end face of the sensitive area to protect the inflatable tube. A rubber sealing ring is arranged on the upper end surface of the lower housing. The end face of the junction area is provided with a junction box consisting of two sockets. The electrode wires of the two electrode plates are placed in the junction box, and are respectively connected to two sockets by flexible wires for inputting high voltage and outputting measurement signals. Compared with the prior art, the utility model can enhance the adaptability to the environment and improve the measurement accuracy.

Description

Penetrating Ionization Chambers for Dose Rate Monitoring of X-ray Sources

technical field

The utility model relates to a radiation imaging system, in particular to a penetrating ionization chamber detector device used in the radiation imaging system, and belongs to the technical field of radiation detection.

Background technique

The penetration ionization chamber is mainly used to solve the monitoring of the dose rate of the accelerator or other radiation sources, so that the beam output dose rate of the accelerator can be stabilized within a certain range, and the imaging cannot be affected by too much absorption of radiation.

The products that penetrate the ionization chamber in the prior art have the advantages of simple structure and low radiation absorption, but their sealing performance is poor, especially in a humid environment or an environment with complex gas components, which can easily cause the ionization chamber to work incorrectly. normal. Because only one double-layer shielded cable is used for high-voltage input and signal output, the leakage current from the high-voltage through the insulating layer to the signal line, and the interference signal can also be coupled to the signal line through the high-voltage layer, which affects the output of the ionization chamber. affect the measurement accuracy.

Contents of the invention

In order to solve the above-mentioned problems in the prior art, the purpose of the invention of the utility model is to provide a penetrating ionization chamber for X-ray source dose rate monitoring. It enhances adaptability to the environment and improves measurement accuracy.

In order to achieve the above-mentioned purpose of the invention, the technical solution of the utility model is realized in the following manner:

A penetrating ionization chamber for X-ray source dose rate monitoring, which includes a lower casing and an upper casing, and a first electrode insulating plate, a first electrode plate, and a second electrode insulating plate are sequentially arranged in the lower casing from bottom to top , a guard ring, a third electrode insulating plate, a second electrode plate, a fourth electrode insulating plate and a leaf spring that can fix the above electrode plate, guard ring, and insulating plate. The upper casing is fixed with the lower casing by screws to form a sensitive area, an inflation and exhaust area and a wiring area. The set air tube leads to the sensitive area through the upper shell or the lower shell. Its structural features are: the end face of the sensitive area is provided with a protective cover for protecting the inflatable tube. A junction box composed of two sockets is provided on the end face of the junction area. The electrode lead wires of the first electrode plate and the second electrode plate are placed in the junction box, respectively connected to the first socket and the second socket through flexible wires for inputting high voltage and outputting measurement signals. A rubber sealing ring is arranged on the upper end surface of the lower housing.

Because the utility model adopts a sealed structure, the gas in the sensitive area is not affected by the external gas, avoids the change of detection efficiency and sensitivity caused by the change of gas composition in the sensitive area, improves the detection stability, and enhances the environmental adaptability. sex. The above-mentioned structure is used in the wiring area, which reduces the influence of high voltage on the output signal of the detector, and has the ability to resist electromagnetic disturbance, and greatly improves the measurement accuracy.

Description of drawings

Fig. 1 is a structural representation of the utility model;

Fig. 2 is the top view of Fig. 1;

Fig. 3 is a diagram of the usage status of the utility model.

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

Detailed ways

Referring to FIG. 1 and FIG. 2 , the penetration ionization chamber of the present invention includes a lower shell 1 and an upper shell 11 . Install the first electrode insulating plate 6, the first electrode plate 4, the second electrode insulating plate 7, the guard ring 3, the third electrode insulating plate 8, the second electrode plate 5, the fourth The electrode insulating plate 9 and the leaf spring 10 that can fix the above-mentioned electrode plate, guard ring and insulating plate. A rubber sealing ring 2 is arranged on the upper end surface of the lower housing 1 . The upper casing 11 is covered on the lower casing 1 with the above-mentioned components installed, and is fixed with screws. The electrode lead wires 17 of the two electrode plates 4 and 5 are placed in the provided junction box 15 and connected to the first socket 13 and the second socket 14 respectively through flexible wires. One is used to input the high voltage required for the detector to work, and the other is used to output the signal current. The gas-filled tube 16 leads through the lower housing 1 to the sensitive area. The end face of the sensitive area is provided with a protective cover 12 for protecting the gas tube, and the protective cover 12 is fixed on the lower casing 1 with screws. The junction box 15 is made of metal material.

Referring to Fig. 3, the rays emitted by the accelerator pass through the utility model to penetrate the ionization chamber and the measured object, and reach the imaging detector array. When using the utility model, the penetrating ionization chamber is fixed on the collimator close to the target point of the ray source, connected with the back circuit, and the work can be carried out.

In use, when the ray enters the sensitive area that penetrates the ionization chamber, the gas in the sensitive area is ionized, and the positive ions and electrons generated move to the two electrode plates under the action of the electric field, and the output forms a current signal. Due to the high voltage applied between the two electrode plates, the resulting leakage current flows directly to the grounded ionization chamber casing through the guard ring without affecting the output signal. The radiation dose rate is different, the intensity of the radiation entering and penetrating the ionization chamber is different, and the output current intensity is different, so the dose rate of the accelerator can be monitored in real time.

Claims (2)

1. A penetrating ionization chamber for X-ray source dose rate monitoring, which comprises a lower casing (1), an upper casing (11), and first electrode insulation is arranged sequentially from bottom to top in the lower casing (1) plate (6), first electrode plate (4), second electrode insulating plate (7), guard ring (3), third electrode insulating plate (8), second electrode plate (5), fourth electrode insulating plate (9) and the plate spring (10) that can fix the above-mentioned electrode plate, protective ring and insulating plate, the upper casing (11) is fixed with the lower casing (1) by screws to form a sensitive area, an inflation and exhaust area and wiring In the area, the air tube (16) provided passes through the lower casing (1) and leads to the sensitive area, which is characterized in that: the end face of the sensitive area is provided with a protective cover (12) for protecting the air tube (16), The end face of the junction area is provided with a junction box (15) consisting of two sockets, and the electrode leads (17) of the first electrode plate (4) and the second electrode plate (5) are placed in the junction box (15). It is respectively connected to the first socket (13) and the second socket (14) by flexible wires for inputting high voltage and outputting measurement signals. The upper end surface of the lower housing (1) is provided with a rubber sealing ring (2). 2. The penetration ionization chamber according to claim 1, characterized in that: the junction box (15) is made of metal material.

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