Radioactivity measurement system device for water environment

Abstract

The utility model provides a water body environment radioactivity measurement system device, which comprises an optical fiber arranged in a water body to be measured, and a scintillator layer arranged on the surface of the optical fiber; and the photomultiplier tube arranged at the end part of the optical fiber is used for converting an optical signal transmitted by the optical fiber into a current signal. The water environment radioactivity measurement system device has the beneficial effects that the water tank main body is arranged, the fixing structure is arranged in the water tank main body to fix the optical fiber, and the optical fiber with the scintillator layer on the surface is placed in the water tank main body through the fixing structure; meanwhile, the two ends of the optical fiber are connected with the photomultiplier arranged at the end of the water tank body, water to be detected is conveyed into the water tank body through the water inlet pipe, and radioactivity monitoring in water is achieved through the optical fiber.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of detection, especially relate to a water body environment radioactivity measuring system device. BACKGROUND

[0002] With the continuous development of nuclear energy and nuclear technology application, the surface water, groundwater and ocean are threatened by more and more radioactive material pollution. Most nuclear power plants and some nuclear plants are built in coastal areas, and these coastal nuclear facilities usually dilute the discharged radioactive material in seawater. In addition, the radioactive material discharged by some inland nuclear facilities will be transported into the soil through runoff or atmosphere, and finally penetrate into groundwater. The alpha and beta radioactivity in water will have internal radiation effects on human body, and the alpha and beta radioactivity activity of water for daily use (especially drinking water) is worth attention.

[0003] Water radioactive pollution has attracted widespread attention of the international community, and water radioactive detection has become an important content of environmental pollution monitoring. It is an urgent need to accelerate the research on water radioactive monitoring technology. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the utility model aims at providing a water body environment radioactivity measuring system device to solve at least one problem in the background technology.

[0005] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0006] A water body environment radioactivity measuring system device comprises:

[0007] An optical fiber is arranged in the water body to be measured, and a scintillator layer is arranged on the surface of the optical fiber;

[0008] A photomultiplier tube is arranged at the end of the optical fiber to convert the optical signal transmitted by the optical fiber into an electric current signal.

[0009] Further, a water tank body for containing the water body to be measured is arranged, a fixing structure for fixing the optical fiber is arranged in the water tank body, and the photomultiplier tube is arranged at the end of the water tank body.

[0010] Further, optical fiber fixing heads are arranged at the two ends of the water tank body, and a phototube seat is connected to the outside of the optical fiber fixing head, and the optical fiber is connected to the photomultiplier tube in the phototube seat after passing through the through hole of the optical fiber fixing head.

[0011] Further, a groove structure for facilitating glue pouring is arranged at one end of the optical fiber fixing head facing the water tank.

[0012] Further, a water tank upper cover is arranged on the water tank body, and a water inlet pipe and a water outlet pipe are arranged on the water tank body.

[0013] Further, the structure of the present scheme is used for detection, and two working modes can be provided with a water pump and the like structure at the mouth of the water inlet pipe and the water outlet pipe of the present scheme to drain water, the first working mode is a water storage type detection, that is, the water outlet is closed, the water to be detected is filled into the water tank body through the water inlet, and the water is discharged through the water outlet after detection; the second working mode is real-time detection, in order to improve the residence time of the water in the water tank body, meet the time requirement of detection, the lower opening of the water tank body is used as the water inlet, and the upper opening is used as the water outlet, that is, the lower inlet and the upper outlet, so as to improve the residence time of the water and complete the real-time detection.

[0014] The horizontal plane where the water inlet pipe is located is lower than the horizontal plane where the water outlet pipe is located, so as to improve the residence time of the water to be detected in the water tank body and improve the detection effect.

[0015] Further, the fixing structure comprises an optical fiber frame, the optical fiber frame comprises an upper base and a lower base, a sub-frame is arranged between the upper base and the lower base, and the sub-frame is fixed between the upper base and the lower base through a slot;

[0016] The sub-frame is uniformly provided with optical fiber holes for facilitating the optical fiber to pass through.

[0017] Further, the optical fiber frame is fixed through the welding baffle in the water tank body.

[0018] The water tank body comprises a groove-shaped water storage structure with an opening at the upper portion, and a cover plate sealing the upper portion of the opening, and the phototube seat is detachably connected to the water tank body through bolts at one end close to the side wall of the water tank body; the detachable structure of the water tank body and the detachable structure between the phototube seat and the water tank body facilitate the maintenance and cleaning of the device in the later period.

[0019] Compared with the prior art, the water body environment radioactive measurement system device has the following beneficial effects:

[0020] The water body environment radioactive measurement system device comprises a water tank body, a fixing structure is arranged in the water tank body to fix an optical fiber, the optical fiber provided with a scintillator layer is placed in the water tank body through the fixing structure, and the two ends of the optical fiber are connected with photomultiplier tubes arranged at the end portions of the water tank body; the water to be detected is conveyed into the water tank body through the water inlet pipe, and the optical fiber is used for realizing the radioactive monitoring of the water. BRIEF DESCRIPTION OF DRAWINGS

[0021] The drawings constituting a part of the present application are used to provide a further understanding of the present application, and the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0022] Figure 1 It is a three-dimensional view of the radioactive measurement device.

[0023] Figure 2 is a three-dimensional view of the optical fiber frame;

[0024] Figure 3 is a schematic view of a cross section of the radioactive measuring device;

[0025] Figure 4 is a schematic view of a three-dimensional structure as a whole;

[0026] Figure 5 is a schematic view of a three-dimensional structure as a whole.

[0027] Explanation of reference signs:

[0028] 1 - photoelectric tube seat; 2 - optical fiber fixing head; 3 - first rubber ring; 4 - water tank main body; 41 - welded baffle; 5 - water tank upper cover; 6 - optical fiber frame; 61 - upper base; 62 - lower base; 7 - bolt; 8 - bolt; 9 - sub-frame; 91 - optical fiber hole; 10 - second rubber ring; 11 - water inlet pipe; 12 - water outlet pipe; 13 - groove. DETAILED DESCRIPTION

[0029] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0030] The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] To achieve effective monitoring of alpha and beta radioactive particles in water, in the present scheme, a water environment radioactive measuring system device is provided, which can realize radioactive measurement in water, so as to analyze the energy and activity of radioactive particles. The present scheme can be used for online monitoring of the cooling water dose in a nuclear power plant, measuring the radioactive dose of the cooling water discharged by the nuclear power plant, and can be used for monitoring the groundwater near the nuclear power plant.

[0032] In the scheme, the surface of the optical fiber is provided with a scintillator layer (the scintillator layer is a common coating in the art, and the silver-doped zinc sulfide powder can be attached to the surface of the optical fiber by using an existing ZnS(Ag) powder, an adhesive and a curing agent, wherein the light transmittance of the adhesive to be used should be ≥ 95%, and the adhesive includes epoxy resin or silicone), and the measurement principle is that the purchased silver-doped zinc sulfide powder, i.e. ZnS(Ag) scintillator powder, is used as an alpha and beta particle action medium, the ZnS(Ag) scintillator powder is applied to the wavelength shift optical fiber, and the purchased radioactive particles in the water are incident to the ZnS(Ag) scintillator powder to generate fluorescence. The fluorescence interacts with the light conversion material in the wavelength shift optical fiber to generate secondary fluorescence. The secondary fluorescence is mainly transmitted along the optical fiber and into the photomultiplier tube through the optical fiber transmission. The optical signal is converted into an electrical signal, and finally collected by the signal analysis system. The energy and activity of the radioactive particles are analyzed to realize the measurement of the radioactivity in the water. The signal analysis by the photomultiplier tube and the signal analysis system can be realized by using the existing technology.

[0033] The device structure designed by the measurement method is shown in the figure, mainly including a water tank body 4 and a water tank upper cover 5, an optical fiber frame 6, two optical fiber fixing heads 2, and two phototube bases 1. The collected radioactive water source enters the water tank through the water inlet pipe 11 at the upper part of the water tank under the action of the water pump. The water inlet pipe 11 and the water outlet pipe 12 are installed on the upper and lower parts of the water tank. The water tank body 4 is connected with the water tank upper cover 5 through a bolt 87 and is sealed by a second rubber ring 10. The optical fiber frame 6 is placed in the water tank and is fixed by the upper and lower welded baffles 41 in the water tank to prevent the movement of the optical fiber frame 6. The optical fiber frame 6 includes an upper and lower base 62 and five sub-frames 9. The sub-frames 9 are fixed between the upper and lower bases 62 through grooving. The sub-frames 9 are evenly distributed with optical fiber holes 91. The optical fiber frame 6 mainly plays a supporting and fixing role for the optical fiber. The optical fiber passes through the optical fiber holes 91 on the sub-frames 9 and is connected with the optical fiber fixing heads 2 at both ends.

[0034] Holes are opened on both sides of the water tank. The optical fiber fixing heads 2 pass through the water tank through the holes. The optical fiber fixing heads 2 are fixed with the water tank through the bolt 87 inside the water tank. The connection is sealed by the first rubber ring 3 to prevent water seepage. The optical fiber fixing heads 2 are evenly distributed with through holes. The optical fiber passes through the through holes.

[0035] A groove 13 is opened on one side of the optical fiber fixing head 2 to facilitate glue pouring. The role of glue pouring is to fix the optical fiber and also to prevent water leakage. The other side of the optical fiber fixing head 2 is connected with the phototube base 11 through a thread. The photomultiplier tube is placed in the phototube base 1. The phototube base 1 mainly plays a supporting and protecting role for the photomultiplier tube. The optical fiber is connected with the photomultiplier tube in the phototube base 1 after passing through the through hole of the optical fiber fixing head 2, thereby realizing signal conversion.

[0036] The wavelength displacement fiber used in the scheme is a special fiber, which is different from the ordinary fiber, and can realize optical signal transmission with maximum efficiency, and has anti-radiation performance and will not be damaged in the radioactive water body, and the fiber is coated with a fiber coating (i.e. a scintillator layer) uniformly coated on the wavelength displacement fiber, the fiber coating in the scheme is insoluble in water, and the radioactive particles in the water body will produce fluorescence when incident to the ZnS(Ag) scintillator powder.

[0037] Finally, it should be pointed out that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application.

[0038] The above is only a preferred embodiment of the present application, and does not limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A water environment radioactivity measuring system apparatus characterized by comprising: The application relates to a water quality testing device. The device comprises: an optical fiber arranged in a water body to be tested, wherein a scintillator layer is arranged on the surface of the optical fiber; a photomultiplier tube is arranged at the end of the optical fiber to convert the light signal transmitted by the optical fiber into an electric current signal; the device comprises a water tank body (4) for containing the water body to be tested, wherein a fixing structure for fixing the optical fiber is arranged in the water tank body (4), and the photomultiplier tube is arranged at the end of the water tank body (4). The water tank body (4) is provided with optical fiber fixing heads (2) at two ends, and the outer side of the optical fiber fixing heads (2) is connected with phototube bases (1); the optical fiber is connected with the photomultiplier tube in the phototube base (1) after penetrating through the through hole of the optical fiber fixing head (2). The optical fiber fixing head (2) is provided with a groove (13) structure for facilitating glue pouring at the end of the water tank.

2. The system of claim 1, wherein: The water tank body (4) is provided with a water tank upper cover (5), and the water tank body (4) is provided with a water inlet pipe (11) and a water outlet pipe (12).

3. A system for measuring radioactivity in a body of water as defined in claim 2, wherein: The fixing structure comprises an optical fiber frame (6), the optical fiber frame (6) comprises an upper base (61) and a lower base (62), and a sub-frame (9) is arranged between the upper base (61) and the lower base (62); the sub-frame (9) is fixed between the upper base (61) and the lower base (62) through slotting.

4. The system of claim 1, wherein: The sub-frame (9) is uniformly provided with optical fiber holes (91) for facilitating the penetration of the optical fiber.

5. The system of claim 1, wherein: The optical fiber frame (6) is fixed through a welding baffle (41) in the water tank body (4). The phototube base (1) is detachably connected with the water tank body (4) through a bolt at one end of the side wall of the water tank body (4).

6. A system for measuring radioactivity in a body of water as defined in claim 5, wherein: ​ 7. The system of claim 2, wherein: ​

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