Pipeline shielding structure with neutron-gamma comprehensive shielding effect

Abstract

The utility model relates to the technical field of nuclear radiation protection, in particular to a pipeline shielding structure with a neutron-Y comprehensive shielding effect, which comprises a polyethylene shielding layer and a lead shielding layer, and is characterized in that the polyethylene shielding layer coats the outer surface of a shielded pipeline, and the lead shielding layer coats the outer surface of the polyethylene layer; the polyethylene shielding layer comprises an inner polyethylene layer and an outer polyethylene layer; the inner polyethylene layer and the outer polyethylene layer are formed by splicing a plurality of sections of annular polyethylene sleeves; the lead shielding layer comprises an inner lead shielding layer and an outer lead shielding layer; and the inner lead shielding layer and the outer lead shielding layer are formed by splicing a plurality of sections of annular lead sleeves. The shielding structure is integrally composed of four layers, two layers are composed of the polyethylene plates of the annular structure, the other two layers are composed of the lead plates of the annular structure, each layer is formed in a section-by-section splicing mode, shielding of neutrons and gamma rays with radioactive pipelines in a long distance can be achieved, reliability is high, and the shielding effect is good.

Description

Technical Field

[0001] The present application relates to the technical field of nuclear radiation protection, and in particular to a pipeline shielding structure with a neutron-gamma comprehensive shielding effect. Background Art

[0002] Materials such as polyethylene and lead are widely used in the field of radiation protection. Among them, polyethylene has a good shielding effect on neutron rays, and lead has a good shielding effect on gamma rays.

[0003] In nuclear operations, there are pipes that carry both neutron and gamma radioactivity, which need to be properly shielded to reduce the radiation dose level on the pipe surface, thereby ensuring the radiation safety of personnel. Summary of the invention

[0004] The present application provides a pipeline shielding structure with a neutron-gamma comprehensive shielding effect, which has strong reliability and good shielding effect and can achieve neutron and gamma ray shielding for long-distance pipelines.

[0005] In order to achieve the above-mentioned objectives, the present application provides a pipeline shielding structure with a neutron-γ comprehensive shielding effect, comprising a polyethylene shielding layer and a lead shielding layer, wherein: the polyethylene shielding layer is coated on the outer surface of the shielded pipeline, and the lead shielding layer is coated on the outer surface of the polyethylene shielding layer; the polyethylene shielding layer comprises an inner polyethylene layer and an outer polyethylene layer, and the inner polyethylene layer and the outer polyethylene layer are both formed by splicing multiple sections of annular polyethylene casing, the inner polyethylene layer is sleeved and coated on the outer surface of the shielded pipeline, and the outer polyethylene layer is sleeved and coated on the outer surface of the inner polyethylene layer; the lead shielding layer comprises an inner lead shielding layer and an outer lead shielding layer, and the inner lead shielding layer and the outer lead shielding layer are both formed by splicing multiple sections of annular lead casing, the inner lead shielding layer is sleeved and coated on the outer surface of the outer polyethylene layer, and the outer lead shielding layer is sleeved and coated on the outer surface of the inner lead shielding layer.

[0006] Furthermore, the annular polyethylene sleeve is formed by splicing two symmetrical semicircular polyethylene plates.

[0007] Furthermore, the annular lead sleeve is formed by splicing two symmetrical semicircular lead plates.

[0008] Furthermore, a gap is left between the axial joints of each section of the annular polyethylene sleeve of the inner polyethylene layer and the axial joints of each section of the annular polyethylene sleeve of the outer polyethylene layer, and the two are arranged alternately.

[0009] Furthermore, a gap is left between the axial joint interface of each section of the annular polyethylene sleeve of the outer polyethylene layer and the axial joint interface of each section of the annular lead sleeve of the inner lead shielding layer, and the two are arranged alternately.

[0010] Furthermore, a gap is left between the axial joint interface of each section of the annular lead sleeve of the inner lead shielding layer and the axial joint interface of each section of the annular lead sleeve of the outer lead shielding layer, and the two are arranged alternately.

[0011] Furthermore, it also includes a clamp, which includes an upper clamp and a lower clamp, which are respectively arranged on the upper and lower outer surfaces of the lead shielding layer to clamp and fasten the lead shielding layer and the polyethylene shielding layer to the outer surface of the shielded pipe.

[0012] The pipeline shielding structure with neutron-γ comprehensive shielding effect provided by the present invention has the following beneficial effects:

[0013] The shielding structure of the present application is composed of four layers as a whole, of which two layers are composed of polyethylene plates with an annular structure, and the other two layers are composed of lead plates with an annular structure. Each layer is constructed in the form of segmented splicing, and there are gaps in the joints between the layers. The layers are staggered at a certain distance and arranged in an alternating manner, which can achieve shielding of neutrons and gamma rays in radioactive pipelines over a long distance, with strong reliability and good shielding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The schematic embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0015] Figure 1 is a side view of a pipeline shielding structure with a neutron-γ integrated shielding effect provided according to an embodiment of the present application;

[0016] Figure 2 is a cross-sectional view of a pipeline shielding structure having a neutron-γ comprehensive shielding effect provided according to an embodiment of the present application;

[0017] In the figure: 1-inner polyethylene layer, 2-outer polyethylene layer, 3-inner lead shielding layer, 4-outer lead shielding layer, 5-shielded pipe, 6-axial splicing interface, 7-upper clamp, 8-lower clamp, 9-splicing incision. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0019] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0020] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0021] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0022] In addition, the term "plurality" shall mean two or more.

[0023] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] like Figure 1-2As shown, the present application provides a pipeline shielding structure with a neutron-γ comprehensive shielding effect, including a polyethylene shielding layer and a lead shielding layer, wherein: the polyethylene shielding layer is coated on the outer surface of the shielded pipe 5, and the lead shielding layer is coated on the outer surface of the polyethylene shielding layer; the polyethylene shielding layer includes an inner polyethylene layer 1 and an outer polyethylene layer 2, and the inner polyethylene layer 1 and the outer polyethylene layer 2 are both formed by splicing multiple sections of annular polyethylene casings, the inner polyethylene layer 1 is sleeved and coated on the outer surface of the shielded pipe 5, and the outer polyethylene layer 2 is sleeved and coated on the outer surface of the inner polyethylene layer 1; the lead shielding layer includes an inner lead shielding layer 3 and an outer lead shielding layer 4, and the inner lead shielding layer 3 and the outer lead shielding layer 4 are both formed by splicing multiple sections of annular lead casings, the inner lead shielding layer 3 is sleeved and coated on the outer surface of the outer polyethylene layer 2, and the outer lead shielding layer 4 is sleeved and coated on the outer surface of the inner lead shielding layer 3.

[0025] Specifically, in a nuclear implementation environment, there are pipelines with both neutron and gamma radioactivity. In order to ensure the radiation safety of personnel and reduce the radiation dose level on the pipeline surface, it is necessary to take corresponding shielding measures for the pipeline. The pipeline shielding structure with neutron-gamma comprehensive shielding effect provided in the embodiment of the present application utilizes the neutron shielding function of polyethylene material and the gamma shielding function of lead, and sequentially wraps a polyethylene shielding layer and a lead shielding layer on the outer surface of the shielded pipeline 5, thereby shielding neutrons and gamma rays, reducing the radiation dose on the surface of the shielded pipeline 5, and ensuring the radiation safety of personnel. Among them, in order to improve the shielding effect, the polyethylene shielding layer and the lead shielding layer both adopt a double-layer structure, which increases the overall thickness of the shielding layer and maximizes the shielding effect. From the inside to the outside, they are the shielded pipe 5, the inner polyethylene layer 1, the outer polyethylene layer 2, the inner lead shielding layer 3 and the outer lead shielding layer 4; and in order to ensure the shielding effect of each layer and achieve long-distance shielding, each layer of the structure is composed of annular sleeve structures of corresponding materials that are spliced ​​together in sections. For example, the inner polyethylene layer 1 is composed of multiple sections of annular polyethylene sleeves from front to back, along the outer surface of the shielded pipe 5, one section at a time, plugged in through the axial splicing interface 6. The splicing process of other shielding layers is the same as that of the inner polyethylene layer 1, and will not be repeated one by one.

[0026] Furthermore, the annular polyethylene sleeve is formed by splicing two symmetrical semicircular polyethylene plates. The two symmetrical semicircular polyethylene plates are snap-fitted and spliced ​​to form an integral annular polyethylene sleeve. In order to make the two semicircular polyethylene plates closely combined, the splicing cutout 9 is tilted and arranged at a certain angle to ensure the stability of the splicing.

[0027] Further, the annular lead sleeve is formed by splicing two symmetrical semicircular lead plates. Similarly, two symmetrical semicircular lead plates are snapped together to form an integral annular lead sleeve, and the splicing cutout 9 is also tilted and at a certain angle.

[0028] Furthermore, a gap is left between the axial joint 6 of each section of the annular polyethylene sleeve of the inner polyethylene layer 1 and the axial joint 6 of each section of the annular polyethylene sleeve of the outer polyethylene layer 2, and the two are arranged alternately.

[0029] Furthermore, a gap is left between the axial joint joint 6 of each section of the annular polyethylene casing of the outer polyethylene layer 2 and the axial joint joint 6 of each section of the annular lead casing of the inner lead shielding layer 3, and the two are arranged alternately.

[0030] Furthermore, a gap is left between the axial joint joint 6 of each section of the annular lead sleeve of the inner lead shielding layer 3 and the axial joint joint 6 of each section of the annular lead sleeve of the outer lead shielding layer 4, and the two are arranged alternately.

[0031] Specifically, in the embodiment of the present application, the axial splicing joints 6 of each section of each layer of the annular sleeve are staggered with the axial splicing joints 6 of the corresponding section of the annular sleeve in the previous layer, that is, the splicing gaps of the annular sleeves between layers are staggered by a certain distance, and the whole is stepped. This facilitates the stable insertion and splicing of the next section of the annular sleeve, so that the sections of the annular sleeves in each layer can be tightly connected to ensure the shielding effect. Finally, a polyethylene shielding layer and a lead shielding layer are spliced ​​and combined by multiple sections of annular polyethylene sleeves and multiple sections of annular lead sleeves.

[0032] Furthermore, it also includes a clamp, which includes an upper clamp 7 and a lower clamp 8, which are respectively arranged on the upper and lower outer surfaces of the lead shielding layer, and the lead shielding layer and the polyethylene shielding layer are clamped and fastened to the outer surface of the shielded pipe 5. The clamp is mainly used to fix the overall shielding layer, and is arranged on the outermost side of each section of the annular lead casing of the outer lead shielding layer 4, and the two layers of lead shielding layers and the two layers of polyethylene shielding layers are clamped and fastened as a whole to the outer surface of the shielded pipe 5, so as to achieve neutron and gamma ray shielding of long-distance radioactive pipelines.

[0033] Specifically, in the implementation of the present application, the thickness of the polyethylene shielding layer and the lead shielding layer can be adjusted. The thickness of each layer of polyethylene plate and lead plate is designed according to factors such as the actual radioactivity level in the shielded pipe 5, the shielding effect to be achieved, the load-bearing limit of the pipe, etc., so as to maximize the shielding effect.

[0034] More specifically, taking radioactive pipes with Cs-137 and Cf-252 as an example, polyethylene sheets and lead sheets of different thicknesses are designed, and the corresponding shielding reduction coefficients are shown in the following table:

[0035] Lead thickness (cm) Weakening multiple 1 260 2 297 3 342 4 401 5 471 6 558 7 669 8 799 9 956 10 1164

[0036] Table 1 Attenuation multiples of Cs-137 by lead plates of different thicknesses

[0037]

[0038]

[0039] Table 2 The weakening factor of Cf-252 by polyethylene sheets of different thicknesses

[0040] From the above table, it can be seen that the polyethylene shielding layer can weaken the radiation effect of neutrons, and the lead shielding layer can weaken the radiation effect of gamma rays. Without considering the influence of other factors, the greater the thickness of the polyethylene shielding layer and the lead shielding layer, the better the overall shielding effect. The embodiment of the present application increases the overall thickness of the polyethylene shielding layer and the lead shielding layer by providing two layers of annular polyethylene plates and two layers of annular lead plates, and can achieve neutron and gamma ray shielding for radioactive pipes over a long distance, with strong reliability and good shielding effect.

[0041] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A pipeline shielding structure with neutron-γ comprehensive shielding effect, characterized in that: It consists of a polyethylene shield and a lead shield, wherein: The polyethylene shielding layer is coated on the outer surface of the shielded pipe, and the lead shielding layer is coated on the outer surface of the polyethylene shielding layer; The polyethylene shielding layer comprises an inner polyethylene layer and an outer polyethylene layer, both of which are formed by splicing multiple sections of annular polyethylene sleeves, the inner polyethylene layer is sleeved and covered on the outer surface of the shielded pipe, and the outer polyethylene layer is sleeved and covered on the outer surface of the inner polyethylene layer; The lead shielding layer includes an inner lead shielding layer and an outer lead shielding layer, both of which are formed by splicing multiple sections of annular lead sleeves. The inner lead shielding layer is sleeved and covered on the outer surface of the outer polyethylene layer, and the outer lead shielding layer is sleeved and covered on the outer surface of the inner lead shielding layer.

2. The pipeline shielding structure with neutron-gamma comprehensive shielding effect according to claim 1 is characterized in that: The annular polyethylene sleeve is formed by splicing two symmetrical semicircular polyethylene plates.

3. The pipeline shielding structure with neutron-gamma comprehensive shielding effect according to claim 2 is characterized in that: The annular lead sleeve is formed by splicing two symmetrical semicircular lead plates.

4. The pipeline shielding structure with neutron-gamma comprehensive shielding effect according to claim 3 is characterized in that: A gap is left between the axial joints of each section of the annular polyethylene sleeve of the inner polyethylene layer and the axial joints of each section of the annular polyethylene sleeve of the outer polyethylene layer, and the two are arranged alternately.

5. The pipeline shielding structure with neutron-gamma comprehensive shielding effect according to claim 4 is characterized in that: A gap is left between the axial joints of each section of the annular polyethylene sleeve of the outer polyethylene layer and the axial joints of each section of the annular lead sleeve of the inner lead shielding layer, and the two are arranged alternately.

6. The pipeline shielding structure with neutron-gamma comprehensive shielding effect according to claim 5, characterized in that: A gap is left between the axial joint interface of each section of the annular lead sleeve of the inner lead shielding layer and the axial joint interface of each section of the annular lead sleeve of the outer lead shielding layer, and the two are arranged alternately.

7. The pipeline shielding structure with neutron-gamma comprehensive shielding effect according to claim 6 is characterized in that: It also includes a clamp, which includes an upper clamp and a lower clamp, which are respectively arranged on the upper and lower outer surfaces of the lead shielding layer to clamp and fasten the lead shielding layer and the polyethylene shielding layer on the outer surface of the shielded pipe.

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