Low-background liquid scintillation spectrometer with automatic sample injection function

Abstract

The utility model provides an automatic sample injection low background liquid scintillation spectrometer, which comprises a detection mechanism, a sampling mechanism and a sample bearing frame for placing sample bottles, the sampling mechanism transfers the sample bottles on the sample bearing frame to the detection mechanism, the detection mechanism comprises a detection chamber, a lead chamber and a lead plug, the detection chamber is provided with a sample detection port, and the lead plug is connected with the lead chamber. The lead chamber is fixedly installed at the top of the detection chamber, a sample inlet is formed in the position, above the sample detection opening, of the lead chamber, the sample inlet in the lead chamber is sealed by the lead plug from the side face, the lead plug is movably connected with the lead chamber, a lead plug driving mechanism is connected between the lead plug and the lead chamber, and the lead plug driving mechanism drives the lead plug to be opened and closed. Therefore, a sample inlet on the lead chamber is closed or exposed. The lead plug driving mechanism drives the lead plug to be automatically opened and closed, automatic sample injection is achieved, the static electricity eliminating mechanism is arranged above the sample inlet and outlet, static electricity of each sample bottle is independently eliminated, and the static electricity eliminating operation is more reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of low-background liquid scintillation spectrometers, in particular to an automatic sampling low-background liquid scintillation spectrometer. Background Art

[0002] Low background liquid scintillation spectrometer is a liquid scintillation counter used for measuring ultra-low level α and β radioactivity. It is mainly used for low level radioactivity in various environmental samples such as water, soil, organisms, aerosols, etc. 3 H. 14 The measurement of radionuclides such as C plays an important role in nuclear waste disposal, environmental protection, archaeological dating, medical analysis, food safety, and scientific research. Low-background liquid scintillation spectrometers use liquid scintillators to receive radiation from the substance being measured and convert it into fluorescent photons. Photoelectric devices then amplify and multiply the light to form pulses. These pulses are then processed through electronic circuits and software to produce a series of waveforms, completing the measurement of the substance. Currently, low-background liquid scintillation spectrometers still suffer from a low degree of automation, and static electricity in sample bottles is typically removed by blowing ionized air over the entire sample loading area, without dedicated static electricity removal for each sample bottle. Utility Model Content

[0003] In response to the deficiencies in the prior art, the utility model provides a low-background liquid scintillation spectrometer with automatic sampling. Automatic sampling is achieved by driving the automatic opening and closing of the lead plug through a lead plug driving mechanism, and an electrostatic elimination mechanism is provided above the sample inlet and outlet to eliminate static electricity for each sample bottle individually, making the static elimination operation more reliable.

[0004] The technical solutions adopted to achieve the above-mentioned purpose of the utility model are:

[0005] A low-background liquid scintillation spectrometer with automatic sampling comprises at least a detection mechanism, a sampling mechanism and a sample carrier for placing sample bottles. The sampling mechanism transfers the sample bottles on the sample carrier to the detection mechanism to complete the detection of the sample to be tested. The detection mechanism comprises a detection chamber, a lead chamber and a lead plug. The detection chamber is provided with a sample detection port. The lead chamber is fixedly mounted on the top of the detection chamber, and a sample inlet is provided on the lead chamber above the sample detection port. The lead plug seals the sample inlet on the lead chamber from the side, and the lead plug and the lead chamber are movably connected. A lead plug driving mechanism is connected between the lead plug and the lead chamber, and the lead plug is driven to open and close by the lead plug driving mechanism, thereby sealing or exposing the sample inlet on the lead chamber.

[0006] The exterior of the detection chamber is covered with a light shield, and the upper portion of the light shield is fixedly connected to the periphery of the lead chamber.

[0007] The sample carrier is provided with a static elimination mechanism at the sample inlet. When each sample bottle enters the sample inlet, static electricity is eliminated by the static elimination mechanism.

[0008] The lead plug driving mechanism includes an externally driven linear motor, a linear slide and a slider. The linear slide is fixed on the lead chamber and parallel to the lead plug. The slider is slidably installed on the linear slide. The lead plug is fixedly connected to the slider. The fixed end of the externally driven linear motor is fixed on the end of the linear slide on the lead plug away from the lead plug, and the movable end of the externally driven linear motor is connected to the lead plug or the slider. The externally driven linear motor drives the lead plug to move horizontally, thereby realizing automatic opening and closing of the lead plug.

[0009] The connection between the lead chamber and the lead plug is arranged as a stepped interlocking structure.

[0010] The connection between the lead chamber and the lead plug adopts a taper matching design to reduce friction.

[0011] The lead chamber is provided with grooves around the sample inlet, and a sealing member is installed on the groove. When the lead plug closes the sample inlet on the lead chamber from the side, the lead plug fits tightly with the sealing member.

[0012] The sealing element is made of an elastic sealing strip.

[0013] Compared with the prior art, the technical solution provided by the present invention has the following advantages: (1) In the detection mechanism of the automatic sampling low-background liquid scintillation spectrometer provided in the present invention, the lead plug is driven by a lead plug driving mechanism to automatically open and close the lead plug, thereby realizing automatic sampling, and an electrostatic elimination mechanism is provided above the sample inlet and outlet to eliminate static electricity for each sample bottle individually, making the static elimination operation more reliable.

[0014] (2) The connection between the lead chamber and the lead plug in the present invention is configured as a stepped interlocking structure and is sealed by a sealing member to ensure the tightness of the lead plug when it is closed; and the connection between the lead plug and the lead chamber adopts a tapered fitting design to reduce friction between parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a diagram of the internal structure of the automatic sampling low-background liquid scintillation spectrometer provided by the utility model;

[0016] Figure 2 It is a structural diagram of the detection mechanism in the utility model;

[0017] Figure 3 It is a structural diagram of the detection chamber of the detection mechanism in the present utility model;

[0018] Figure 4 It is a structural diagram of the lead chamber of the detection mechanism in the utility model;

[0019] Figure 5 This is a schematic diagram of the structure of the sealing member in the detection mechanism of the present utility model;

[0020] Figure 6This is a schematic diagram of the structure after the seal is installed on the lead chamber of the utility model;

[0021] Figure 7 It is a cross-sectional schematic diagram of the detection mechanism when the lead plug is closed in the utility model;

[0022] Figure 8 It is a cross-sectional schematic diagram of the detection mechanism when the lead plug in the utility model is opened;

[0023] Figure 9 This is a schematic diagram of the sample bottle passing through the static elimination mechanism in the present invention;

[0024] In the figure: 1-detection mechanism, 11-detection chamber, 111-sample detection port, 12-lead chamber, 121-sample inlet, 122-groove, 13-lead plug, 141-external drive linear motor, 142-linear slide rail, 143-slider, 15-seal, 16-light shield, 2-sampling mechanism, 3-sample carrier, 4-sample bottle, 5-static elimination mechanism. DETAILED DESCRIPTION

[0025] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] The structure of the automatic injection low background liquid scintillation spectrometer provided by the utility model is as follows Figure 1 As shown, it includes a detection mechanism 1, a sampling mechanism 2 and a sample carrier 3 for placing sample bottles. The sampling mechanism transfers the sample bottles 4 on the sample carrier to the detection mechanism to complete the detection of the sample to be tested.

[0027] In this embodiment, the detection mechanism includes a detection chamber 11, a lead chamber 12 and a lead plug 13. Figure 2 As shown, the detection chamber is provided with a sample detection port 111, as shown in FIG. Figure 3 As shown, the sample bottle is placed into the detection chamber through the sample detection port, and the detection module in the detection chamber detects the sample to be detected in the sample bottle. The structure of the detection chamber is an existing conventional structure and is not described in detail here. The lead chamber is fixedly installed on the top of the detection chamber, and a sample inlet 121 is provided on the lead chamber above the sample detection port. Figure 4 As shown, the lead plug closes the sample inlet on the lead chamber from the side, and the lead plug and the lead chamber are movably connected. A lead plug driving mechanism is connected between the lead plug and the lead chamber, and the lead plug is driven to open and close by the lead plug driving mechanism, thereby closing or exposing the sample inlet on the lead chamber.

[0028] In this embodiment, the connection between the lead chamber and the lead plug is set as a stepped interlocking structure. Figure 4 and Figure 7 Specifically, the lead chamber is provided with grooves 122 around the sample inlet. Figure 4 , a seal 15 is installed on the groove, such as Figure 5 and Figure 6 As shown, when the lead plug seals the sample inlet on the lead chamber from the side, it fits tightly against the seal, preventing light from entering the test chamber through a gap at the connection between the lead chamber and the lead plug during testing, thus providing a light shield. Furthermore, the seal is made of an elastic sealing strip, such as a silicone strip. Preferably, the connection between the lead plug and the lead chamber adopts a tapered design to reduce friction, particularly on the seal, and thus increase the service life of the components.

[0029] Specifically, the lead plug driving mechanism includes an external linear motor 141, a linear slide 142 and a slider 143. The linear slide is fixed on the lead chamber and parallel to the lead plug. The slider is slidably installed on the linear slide. The lead plug is fixedly connected to the slider. The fixed end of the external linear motor is fixed to the end of the linear slide on the lead plug away from the lead plug, and the movable end of the external linear motor is connected to the lead plug or the slider. The external linear motor drives the lead plug to move horizontally, thereby realizing automatic opening and closing of the lead plug. Figure 7 and Figure 8 shown.

[0030] In this embodiment, the outer cover of the detection chamber is provided with a light shield 16, and the upper part of the light shield is fixedly connected to the periphery of the lead chamber to shield the entire detection chamber. Figure 2 To avoid interference from cosmic rays. For easy installation, the linear guide rails of the lead plug drive mechanism and the external drive linear motor are fixed on the light shield.

[0031] In this embodiment, the sample carrier is installed with a static elimination mechanism 5 at the sample inlet. When each sample bottle enters the sample inlet, the static electricity is eliminated by the static elimination mechanism. When the sampling device transfers the sample bottle to the static elimination mechanism during program control, it needs to stay for 3 seconds to eliminate static electricity before entering the detection room for detection. Figure 9 shown.

Claims

1. An automatic sampling low-background liquid scintillation spectrometer comprising at least a detection mechanism, a sampling mechanism, and a sample carrier for placing sample bottles. The sampling mechanism transfers the sample bottles from the sample carrier to the detection mechanism to complete the detection of the sample to be tested. The invention is characterized by: The detection mechanism includes a detection chamber, a lead chamber and a lead plug. The detection chamber is provided with a sample detection port. The lead chamber is fixedly installed on the top of the detection chamber, and a sample inlet is provided on the lead chamber above the sample detection port. The lead plug closes the sample inlet on the lead chamber from the side, and the lead plug and the lead chamber are movably connected. A lead plug driving mechanism is connected between the lead plug and the lead chamber, and the lead plug is driven to open and close by the lead plug driving mechanism, thereby closing or exposing the sample inlet on the lead chamber.

2. The automatic injection low-background liquid scintillation spectrometer according to claim 1, characterized in that: The exterior of the detection chamber is covered with a light shield, and the upper portion of the light shield is fixedly connected to the periphery of the lead chamber.

3. The automatic injection low-background liquid scintillation spectrometer according to claim 1, characterized in that: The sample carrier is provided with a static elimination mechanism at the sample inlet. When each sample bottle enters the sample inlet, static electricity is eliminated by the static elimination mechanism.

4. The automatic injection low-background liquid scintillation spectrometer according to claim 1, characterized in that: The lead plug driving mechanism includes an external-drive linear motor, a linear slide and a slider. The linear slide is fixed on the lead chamber and parallel to the lead plug. The slider is slidably installed on the linear slide. The lead plug is fixedly connected to the slider. The fixed end of the external-drive linear motor is fixed to the end of the linear slide on the lead plug away from the lead plug, and the movable end of the external-drive linear motor is connected to the lead plug or the slider. The external-drive linear motor drives the lead plug to move horizontally, thereby realizing automatic opening and closing of the lead plug.

5. The automatic injection low-background liquid scintillation spectrometer according to claim 1, characterized in that: The connection between the lead chamber and the lead plug is arranged as a stepped interlocking structure.

6. The automatic injection low-background liquid scintillation spectrometer according to claim 1, characterized in that: The connection between the lead chamber and the lead plug adopts a taper matching design to reduce friction.

7. The automatic injection low-background liquid scintillation spectrometer according to claim 1, characterized in that: The lead chamber is provided with grooves around the sample inlet, and a sealing member is installed on the groove. When the lead plug closes the sample inlet on the lead chamber from the side, the lead plug fits tightly with the sealing member.

8. The automatic injection low-background liquid scintillation spectrometer according to claim 7, characterized in that: The sealing element is made of an elastic sealing strip.

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