Explosion-proof radioactive gas radiation monitor

Abstract

The utility model provides an explosion-proof radioactive gas radiation monitor which comprises an explosion-proof sodium iodide detector, a lead shielding body and an in-situ radiation processing unit, and the explosion-proof sodium iodide detector is wrapped in the lead shielding body by the lead shielding body; the explosion-proof sodium iodide detector comprises a sodium iodide crystal, a photomultiplier, a power supply circuit and a signal processing circuit, the rear end of the sodium iodide crystal is in coupling connection with the photomultiplier through a coupling agent, the rear end of the photomultiplier is in line connection with the power supply circuit and the signal processing circuit, and a stainless steel shell cavity is arranged outside the photomultiplier for wrapping; isolation distances are arranged between the rear end of the photomultiplier and the power supply circuit and between the power supply circuit and the signal processing circuit. The in-situ radiation processing unit is used for displaying and transmitting information of the detector. The novel structure is explosion-proof, and when a measured value exceeds a preset alarm threshold value, the novel structure can give out a sound-light alarm for data of the detector.

Description

TECHNICAL FIELD

[0001] The utility model relates to a radiation detection field, specifically is a kind of anti-explosion radioactive gas radiation monitor. BACKGROUND

[0002] Anti-explosion sodium iodide detector converts the gamma photon radiation signal emitted in the gas of the measured pipeline into electrical signal and outputs to electronic components, and the received electrical signal is converted into digital signal after amplification, processing by electronic components, and finally the detector signal is transmitted to on-site radiation processing unit. The on-site radiation processing unit gives the radioactivity concentration data of the position of the detector by collecting, storing and processing the digital signal.

[0003] Because flammable gas is contained in the measuring pipeline, anti-explosion treatment is required. Generally, the gas is first treated for anti-explosion (gas concentration treatment, etc.) and then measured, which is a relatively complex process. Second, the current detector data has no alarm function when the measured value exceeds the preset alarm threshold. UTILITY MODEL CONTENT

[0004] The utility model is provided to solve the problems in the background art. The anti-explosion radioactive gas radiation monitor can prevent explosion and give an audible and visual alarm when the measured value exceeds the preset alarm threshold.

[0005] The utility model discloses a kind of anti-explosion radioactive gas radiation monitors, including anti-explosion sodium iodide detector, lead shielding body, on-site radiation processing unit, the lead shielding body is wrapped in lead shielding body with anti-explosion sodium iodide detector;The anti-explosion sodium iodide detector includes sodium iodide crystal, photomultiplier, power supply circuit and signal processing circuit, the sodium iodide crystal rear end is coupled with photomultiplier by coupling agent and is coupled connection, the photomultiplier rear end is connected with power supply circuit and signal processing circuit line and is externally set with stainless steel shell cavity and is wrapped;The photomultiplier rear end is set with isolation spacing between power supply circuit, power supply circuit and signal processing circuit, and the on-site radiation processing unit is used for the display and transmission of detector information.

[0006] Further, the isolation spacing between the photomultiplier rear end and the power supply circuit, the power supply circuit and the signal processing circuit is greater than 15 mm.

[0007] Further, the stainless steel shell cavity is a cylinder.

[0008] Further, the thickness of the shielding body is greater than 120 mm.

[0009] Further, the in-situ radiation processing unit comprises an ARM main processor, a display screen, an input keyboard, an RS485 port and an I / O port; the display screen displays measurement data in a format set by the ARM main processor; the input keyboard inputs corresponding information; the RS485 port transmits or receives data sent by a signal processing circuit; and the I / O port receives measured data, outputs an alarm or a switch control signal.

[0010] The photomultiplier tube rear end is connected with the power supply circuit and the signal processing circuit, and is wrapped by a stainless steel shell cylindrical cavity, so that the wiring cavity is increased, and a sufficient size is ensured, thereby playing a role of explosion prevention.

[0011] The in-situ radiation processing unit comprises an ARM main processor, a display screen, an input keyboard, an RS485 port and an I / O port; the display screen displays measurement data in a format set by the ARM main processor; the input keyboard inputs corresponding information; the RS485 port transmits or receives data sent by a signal processing circuit; and the I / O port receives measured data, outputs an alarm or a switch control signal. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a structural schematic view of the explosion-proof radioactive gas radiation monitor of the utility model;

[0013] Figure 2 It is a structural schematic view of the in-situ radiation processing unit of the explosion-proof radioactive gas radiation monitor of the utility model;

[0014] Reference signs: sodium iodide detector-1, lead shielding body-2, in-situ radiation processing unit-3, sodium iodide crystal-4, photomultiplier tube-5, power supply circuit-6, signal processing circuit-7. DETAILED DESCRIPTION

[0015] The application will be further described below in combination with the drawings and examples.

[0016] As Figure 1As shown, an explosion-proof radioactive gas radiation monitor includes an explosion-proof sodium iodide detector 1, a lead shielding body 2, and an in-situ radiation processing unit 3. The lead shielding body wraps the explosion-proof sodium iodide detector in the lead shielding body. The explosion-proof sodium iodide detector includes a sodium iodide crystal 4, a photomultiplier tube 5, a power supply circuit 6, and a signal processing circuit 7. The sodium iodide crystal is coupled to the photomultiplier tube at the rear end through a coupling agent. The rear end of the photomultiplier tube is connected to the power supply circuit and the signal processing circuit and is wrapped by an external stainless steel shell cavity. The stainless steel shell cavity is a cylinder. An isolation distance is provided between the rear end of the photomultiplier tube and the power supply circuit and between the power supply circuit and the signal processing circuit. The isolation distance is greater than 15 mm. The in-situ radiation processing unit is used for display and transmission of detector information.

[0017] The detector is designed to prevent explosion in the presence of flammable gas in the measuring pipeline. The main explosion-proof design is reflected in the following aspects:

[0018] (1) The material and thickness of the stainless steel cylindrical shell of the detector are optimized.

[0019] (2) The wiring cavity is increased to ensure sufficient size for reliable connection of the wires.

[0020] The sodium iodide crystal has a density of 3.67 g / cm 3 . The rear end of the crystal is coupled to the photomultiplier tube through a coupling agent to reduce light loss. The rear end of the photomultiplier tube is connected to the voltage divider circuit and electronic components to complete power supply and signal processing. The shell is made of stainless steel with a density of 7.8 kg / cm 3 . The top surface is 1.5 mm thick, and the cylindrical side surface is 2 mm thick. The entire detector is designed to be sealed, waterproof, moisture-proof, and salt mist-proof.

[0021] The thickness of the shielding body is greater than 120 mm. The thickness of the shielding body is selected to reduce background interference and achieve the lower limit of the device measurement. Under the premise of meeting the size and weight, in combination with the shielding scheme of the same equipment of other manufacturers, the lead shielding thickness of the device is 125 mm.

[0022] As shown in Figure 2 , the in-situ radiation processing unit includes an ARM main processor, a display screen, an input keyboard, an RS485 port, and an I / O port. The display screen displays measurement data in the format set by the ARM main processor. The input keyboard inputs corresponding information. The RS485 port transmits or receives data sent by the signal processing circuit. The I / O port receives measured data, outputs an alarm or switch control signal. The ARM main processor reads the detector monitoring data, compares the set alarm threshold, determines the current alarm state as alarm triggering or alarm release, and realizes the detector data. When the measurement value exceeds the preset alarm threshold, an audible and visual alarm can be issued.

Claims

1. An explosion-proof radioactive gas radiation monitor comprising an explosion-proof sodium iodide detector, a lead shield, an in-situ radiation processing unit, characterized in that, The lead shielding body wraps the explosion-proof sodium iodide detector in the lead shielding body; the explosion-proof sodium iodide detector comprises a sodium iodide crystal, a photomultiplier tube, a power supply circuit and a signal processing circuit, the rear end of the sodium iodide crystal is coupled and connected with the photomultiplier tube through a coupling agent, the rear end of the photomultiplier tube is connected with the power supply circuit and the signal processing circuit and is wrapped outside by a stainless steel shell cavity; an isolation spacing is arranged between the rear end of the photomultiplier tube and the power supply circuit, the power supply circuit and the signal processing circuit, and the in-situ radiation processing unit is used for display and transmission of detector information.

2. The explosion-proof radioactive gas radiation monitor according to claim 1, characterized in that, The isolation spacing between the rear end of the photomultiplier tube and the power supply circuit, the power supply circuit and the signal processing circuit is greater than 15 mm.

3. The explosion-proof radioactive gas radiation monitor according to claim 1, characterized in that, The stainless steel shell cavity is a cylinder.

4. The explosion-proof radioactive gas radiation monitor according to claim 1, wherein The thickness of the shielding body is greater than 120 mm.

5. The explosion-proof radioactive gas radiation monitor according to claim 1, wherein The in-situ radiation processing unit comprises an ARM main processor, a display screen, an input keyboard, an RS485 port and an I / O port; the display screen displays measurement data in a format set by the ARM main processor, the input keyboard inputs corresponding information, the RS485 port transmits or receives data sent by the signal processing circuit, and the I / O port receives measured data, outputs an alarm or a switching control signal.

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