Lead shielding chamber sample changing structure

Abstract

The utility model relates to a lead shielding chamber sample changing structure which comprises a lead shielding chamber cover, a lead shielding chamber body and a movable lead shielding chamber wall, and the movable lead shielding chamber wall is located on the opening side of the lead shielding chamber body and is in sliding connection with the lead shielding chamber body through a sliding rail to form a lead shielding chamber. Two probes of the high-purity germanium detectors which are oppositely arranged are arranged in the lead shielding chamber, when a sample is replaced, the lead shielding chamber cover is opened, and the movable lead shielding chamber wall and the high-purity germanium detectors fixed with the movable lead shielding chamber wall slide through the hand wheel on the slide rail, so that the distance between the two high-purity germanium detectors is adjusted; according to the structure, low-background and high-efficiency measurement of samples with different sizes can be realized, so that the detection sensitivity of the system is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to radionuclide high sensitivity measurement technical field, specifically relates to a lead shield room sample structure. BACKGROUND

[0002] Developing radionuclide high sensitivity measurement technology research has important significance to low level radioactivity monitoring.According to the detection sensitivity evaluation standard, the system detection sensitivity can be improved from reducing background, improving detection efficiency and the like. In the aspect of reducing background, lead shielding room is often used to shield the environmental background, and the influence of cosmic rays on the detection sensitivity is removed by using the anti-cosmic ray device. In the aspect of improving detection efficiency, multiple sets of detectors can be used for simultaneous measurement to increase the detection solid angle. For samples of different sizes, the relative distance of the detectors needs to be adjusted to place the samples, so it is particularly important to design the lead shielding room structure to adjust the relative position of the detectors. SUMMARY

[0003] The utility model provides a lead shield room sample structure, realizes low background, high efficiency measurement of different size samples.

[0004] In order to solve the above technical problem, the utility model provides a lead shield room sample structure, which is characterized by comprising a lead shielding room cover, a lead shielding room main body and a movable lead shielding room wall, the movable lead shielding room wall is located at the opening side of the lead shielding room main body, is connected through a slide rail slidingly, and forms a lead shielding room; there are two probe heads of high purity germanium detectors oppositely arranged in the lead shielding room; one high purity germanium detector is assembled on the movable lead shielding room wall, and the other high purity germanium detector is assembled on the side wall of the lead shielding room main body; the lead shielding room cover is installed on the upper end of the lead shielding room.

[0005] Further, one end of the lead shielding room cover is hinged to the upper end of the lead shielding room main body.

[0006] Further, the lead shielding room cover is opened through an electric push rod or a hydraulic push rod.

[0007] Further, a hand wheel is arranged on the rotating slide rail and is used for sliding the movable lead shielding room wall and the high purity germanium detector fixed thereto, so as to adjust the distance between the two probe heads of the high purity germanium detectors.

[0008] Further, the two high purity germanium detectors are fixed to the side wall of the lead shielding room through a detector support.

[0009] Further, a planar plastic scintillator detector is arranged on the periphery of the lead shielding room.

[0010] Further, the inner wall of the lead shielding room is coated with a layer of oxygen-free copper, and the periphery of the lead shielding room is coated with a stainless steel plate.

[0011] Further, the two plastic scintillator detectors and the lead shielding chamber are provided with wedge-shaped slots at positions where the high-purity germanium detectors are installed.

[0012] Further, the lead shielding chamber cover is provided with slots at a contact surface of the lead shielding chamber body, for passing through the inflation pipeline and the signal line.

[0013] Beneficial effects: the sample changing structure can adjust the distance between the detectors according to the geometric shape of the sample, without affecting the shielding effect, and realizes high-efficiency and low-background measurement of different sizes of samples.

[0014] 1. The utility model discloses a lead shielding chamber and the fixed detector are moved together, and the distance between the two high-purity germanium detectors is adjusted, and high-efficiency measurement of different sizes of samples can be realized.

[0015] 2. The lead shielding chamber cover is opened by two sets of electric push rods, and the artificial operation workload is reduced.

[0016] 3. The anti-cosmic ray plastic scintillator detector, the lead shielding chamber and the detector are moved together, and when the sample is measured, the four-pi solid angle is formed, and the cosmic ray background interference is reduced. DRAWINGS

[0017] Fig. 1 It is the lead shielding chamber sample changing structure sectional view;

[0018] Fig. 2 It is the lead shielding chamber sample changing structure right view;

[0019] Fig. 3 It is the lead shielding chamber sample changing structure three-dimensional structure diagram;

[0020] Wherein 1 is the lead shielding chamber body, 2 is the lead shielding chamber cover, 3 is the support, 4 is the electric push rod, 5 is the slide rail, 6 is the lower plastic scintillator detector, 7 is the left plastic scintillator detector, 8 is the right plastic scintillator detector, 9 is the upper plastic scintillator detector, 10 is the high-purity germanium detector, 11 is the front plastic scintillator detector, 12 is the rear plastic scintillator detector, 13-1 and 13-2 are the detector support, and 14 is the movable lead shielding chamber wall. PREFERRED EMBODIMENT

[0021] In order to make the purpose, content and advantages of the utility model more clear, the specific embodiment of the utility model is described in further detail below.

[0022] The utility model discloses a lead shielding chamber sample changing structure, including lead shielding chamber cover 2, lead shielding chamber body 1 and movable lead shielding chamber wall, movable lead shielding chamber wall is located at the opening side of lead shielding chamber body 1, is connected through slide rail 5 sliding, forms lead shielding chamber, and the lead shielding chamber has two high-purity germanium detector probes that place oppositely.

[0023] The lead shielding room cover is an electric lead shielding room upper cover; the lead shielding room cover is installed on the upper end of the lead shielding room body.

[0024] Specifically, one end of the lead shielding room cover is hinged to the upper end of the lead shielding room body 1, and the lead shielding room cover is opened by two sets of electric push rods or hydraulic push rods.

[0025] The lead shielding room body 1 is fixed as a whole on the frame body, and the lower end of the hydraulic push rod is hinged to the frame body.

[0026] One high-purity germanium detector is assembled on the movable lead shielding room wall, and the other high-purity germanium detector is assembled on the side wall of the lead shielding room body 1. A hand wheel is arranged on the rotating slide rail 5, and the movable lead shielding room wall and the high-purity germanium detector fixed thereto are slid through the screw nut principle, so as to adjust the distance between the two high-purity germanium detector probes.

[0027] The two high-purity germanium detectors are fixed with the side wall of the lead shielding room through the detector support, and a wedge-shaped groove is opened on the side wall of the lead shielding room to reduce the background interference.

[0028] The lead shielding room is provided with a planar plastic scintillator detector on the periphery of the lead shielding room, and the cosmic ray background influence is reduced through anticoincidence. The plastic scintillator on the side where the refrigeration controller 10-1 and 10-2 of the two high-purity germanium detectors are located is opened with a wedge-shaped groove for placing the high-purity germanium detector.

[0029] The inner wall of the lead shielding room is coated with a layer of oxygen-free copper, and the wedge-shaped groove penetrates the oxygen-free copper.

[0030] The periphery of the lead shielding room is coated with a stainless steel plate, and the wedge-shaped groove of the plastic scintillator penetrates the stainless steel plate.

[0031] The contact surface of the lead shielding room cover and the lead shielding room body is grooved for passing through the inflation pipeline and signal lines.

[0032] Figs. 1-3 The sample replacement structure of the lead shielding room is a sectional view, a right view and a three-dimensional structure view. The sample replacement structure can adjust the distance between the detectors according to the geometric shape of the sample, without affecting the shielding effect, and realizes high efficiency and low background measurement of different size samples.

[0033] When the sample is replaced, the lead shielding room cover 2 can be electrically opened through the two sets of electric push rods 4, reducing the workload of manual operation. The hand wheel on the rotating slide rail 5 can move the lead shielding room wall and the high-purity germanium detector 10 fixed thereto, and after the sample is replaced, the detector is moved to the end face close to the sample, increasing the detection efficiency and improving the detection sensitivity. The distance between the two detector probes is adjustable between 0-110mm, and the movable lead shielding room wall can always cover the lead shielding room body 1 during the movement, ensuring that there is no gap in the lead shielding room during the movement of the detector and the lead shielding room wall, and ensuring the shielding effect.

[0034] The above merely describes preferred embodiments of the present application, and it should be noted that, for those skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, and these improvements and modifications should also be considered as falling within the protection scope of the present application.

Claims

1. A sample changing structure for a lead-shielded room, characterized in that: The device includes a lead shielding chamber cover, a lead shielding chamber body, and a movable lead shielding chamber wall. The movable lead shielding chamber wall is located on the open side of the lead shielding chamber body and is slidably connected by a slide rail to form the lead shielding chamber. Inside the lead shielding chamber are two high-purity germanium detectors placed opposite each other. One high-purity germanium detector is mounted on the movable lead shielding chamber wall, and the other high-purity germanium detector is mounted on the side wall of the lead shielding chamber body. The lead shielding chamber cover is installed at the top of the lead shielding chamber.

2. The lead-shielded room sample changing structure according to claim 1, characterized in that: One end of the cover of the lead shielding room is hinged to the upper end of the main body of the lead shielding room.

3. The lead-shielded room sample changing structure according to claim 1, characterized in that: The main body of the lead-shielded room is fixed to the frame.

4. The lead-shielded room sample changing structure according to claim 1, characterized in that: The lead-shielded chamber cover can be opened using an electric or hydraulic push rod.

5. The lead-shielded room sample changing structure according to claim 1, characterized in that: A handwheel is provided on the rotating slide rail, which is used to slide the movable lead shielding chamber wall and the high-purity germanium detector fixed thereto, and adjust the distance between the two high-purity germanium detector probes.

6. The lead-shielded room sample changing structure according to claim 1, characterized in that: Two high-purity germanium detectors are fixed to the side wall of the lead-shielded chamber via detector brackets.

7. The lead-shielded room sample changing structure according to claim 1, characterized in that: Planar plastic scintillator detectors are installed on both the outer perimeter of the lead-shielded exterior.

8. The lead-shielded room sample changing structure according to claim 1, characterized in that: The inner wall of the lead shielding chamber is covered with a layer of oxygen-free copper, and the outer wall of the lead shielding chamber is covered with stainless steel plate.

9. A sample changing structure for a lead-shielded room according to claim 7, characterized in that: Both plastic scintillator detectors and the lead-shielded chamber have wedge-shaped slots at the locations where high-purity germanium detectors are installed.

10. A sample changing structure for a lead-shielded room according to any one of claims 1-9, characterized in that: The lead shielding chamber cover has a groove on the contact surface with the main body of the lead shielding chamber to allow the inflation pipes and signal lines to pass through.

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