CN210982747U

CN210982747U - Shielding room and low background gamma spectrometer

Info

Publication number: CN210982747U
Application number: CN201921899475.3U
Authority: CN
Inventors: 董翀; 李科; 崔春桐
Original assignee: Beijing Nuc Safe Technology Co ltd
Current assignee: Beijing Nuc Safe Technology Co ltd
Priority date: 2019-11-05
Filing date: 2019-11-05
Publication date: 2020-07-10
Anticipated expiration: 2029-11-05

Abstract

The utility model provides a shielding room and low background gamma energy spectrometer, relates to sample measuring equipment technical field, the shielding room includes shielding box, shielding lid and detector, and the shielding box includes: the shielding structure comprises an outer shielding body and an inner shielding body which is arranged in the outer shielding body and is detachably connected with the outer shielding body; the inner shielding body is provided with a measuring cavity, the detector is positioned in the measuring cavity, and the shielding cover body covers the opening of the measuring cavity; the detector also comprises a connecting wire, and the connecting wire penetrates through the shielding box body and is detachably connected with the detector. The detector and the inner shield in the shielding chamber can be detached respectively for cleaning, so that the cleaning is more thorough, and the measurement error caused by incomplete cleaning is reduced or avoided to a certain extent.

Description

Shielding room and low background gamma spectrometer

Technical Field

The utility model relates to a sample measuring equipment field particularly, relates to a shielding room and low background gamma spectrometer.

Background

Low background gamma spectrometers, which typically include a shielded room and a data processing system, are widely used for the measurement of natural or artificial radioactivity in low-level environmental samples. The shielding chamber component materials of the conventional low-background spectrometer in the market are widely used as lead and copper, and rare metals such as cadmium and tin are added to part of equipment. The lead shield is used to withstand the external high background count, and is relatively thick, and the copper shield is used to prevent interference from X-rays.

The detector is arranged in the inner cavity of the low-background gamma energy spectrometer shielding chamber, and a sample can be placed in the inner cavity when a radioactive sample is measured, so that the surface of a probe of the detector and the surface of the inner cavity are often subjected to radioactive contamination. At present, the probe of the detector in a low-background lead room is difficult to take out for scrubbing after being installed in the market. The surface cleaning operation of the inner cavity of the lead chamber is difficult to realize, and the unclean cleaning of the probe and the inner wall of the cavity can cause measurement errors.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a shielding room and low background gamma energy spectrometer, it can alleviate the measuring error who leads to because of the washing is unclean to a certain extent.

The embodiment of the utility model is realized like this:

a shielded room, it includes shielding box, shielding lid and detector, wherein:

the shielding box body includes: the shielding structure comprises an outer shielding body and an inner shielding body which is arranged in the outer shielding body and is detachably connected with the outer shielding body;

the inner shielding body is provided with a measuring cavity, the detector is positioned in the measuring cavity, and the shielding cover body covers the opening of the measuring cavity;

the detector also comprises a connecting wire, and the connecting wire penetrates through the shielding box body and is detachably connected with the detector.

In a preferred embodiment of the present invention, the inner shield is provided with a first wiring hole, the outer shield is provided with a second wiring hole, and the first wiring hole is communicated with the second wiring hole; the connecting wire passes through the grafting end with the detector intercommunication, the grafting end can pass first wiring hole with the second wiring hole.

In a preferred embodiment of the present invention, the outer shield includes a copper shield layer, a lead shield layer is coated outside the copper shield layer, and a steel shield layer is coated on an outer surface of the lead shield layer; the inner shield includes a glass shield layer.

In the preferred embodiment of the present invention, the outer side surface of the glass shielding layer is provided with a fixing portion, and the fixing portion is detachably connected to the steel shielding layer through a positioning bolt.

In a preferred embodiment of the present invention, the fixing portion is in contact with the top surface of the stainless steel shielding layer, and the outer edge of the top surface of the stainless steel shielding layer is provided with a hand fastening groove.

In a preferred embodiment of the present invention, the shielding cover includes a body made of lead, and a stainless steel cover covering the outer surface of the body.

In a preferred embodiment of the present invention, the lead shielding layer includes a bottom plate and a plurality of annular bodies, and the plurality of annular bodies are stacked on the bottom plate, the annular bodies are provided with a groove and a protrusion, and the protrusion of the annular body extends into the groove of the adjacent annular body.

In the preferred embodiment of the present invention, the shielding box comprises a first cylinder and a second cylinder, the cover covers one end of the first cylinder, the second cylinder is connected to the other end of the first cylinder, the inner diameter of the first cylinder is greater than the inner diameter of the second cylinder, and the outer diameter of the first cylinder is greater than the inner diameter of the second cylinder.

The utility model discloses in the preferred embodiment, still include supporting platform, the shielding box install in supporting platform is last, the gyro wheel is installed to supporting platform's bottom.

A low background gamma spectrometer comprising a shielded chamber as described in the previous claims.

The embodiment of the utility model provides a beneficial effect is: in the process of detecting the sample, the shielding cover body is moved away from the opening of the measurement cavity, the sample is placed into the measurement cavity through the opening of the measurement cavity, specifically placed at the probe of the detector, and the sample is measured through the detector.

The connecting wire penetrates through the shielding box body and is detachably connected with the detector, so that the detector can be separated from the connecting wire, the detector is taken out from the opening of the measuring chamber to be cleaned, and after the detector is taken out, the operating space is larger, and more thorough cleaning is facilitated; because the inner shield and the outer shield are detachably connected, the inner shield and the outer shield can be separated, and then the inner shield is cleaned. Because for the shielded cell is whole, interior shield weight is lighter relatively, separates interior shield and outer shield back, cleans interior shield alone, because interior shield weight is lighter relatively, consequently easily removes, is convenient for clean the going on of work to can carry out more thorough cleaning operation.

Compare with the shielded cell among the prior art, because the shielded cell that this application provided can carry out more thorough cleanness to interior shield and detector, consequently can clear away the probe surface and the radioactive contamination of inner chamber surface of detector to alleviate or avoid because of the measuring error that the washing is unclean to lead to, improve measurement accuracy.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a first cross-sectional view of a shielding chamber according to an embodiment of the present invention;

fig. 2 is a second cross-sectional view of the shielding chamber according to the embodiment of the present invention;

fig. 3 is a schematic structural diagram of a lead shielding layer in a shielding chamber according to an embodiment of the present invention;

fig. 4 is a top view of a ring body in a shielding chamber according to an embodiment of the present invention;

fig. 5 is a cross-sectional view of an inner shield in a shielding chamber according to an embodiment of the present invention;

fig. 6 is a top view of an inner shield in a shielding chamber according to an embodiment of the present invention.

In the figure:

10-a shield cover; 20-a detector; 30-a connecting line;

31-a plug end; 40-a glass shielding layer; 41-a first wiring hole;

42-a fixed part; 43-positioning holes; 44-a detection chamber;

50-steel shielding layer; 51-a hand buckling groove; 60-lead shielding layer;

61-a base plate; 62-an annular body; 63-bump;

70-a copper shield layer; 80-supporting the platform.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of the embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which is usually placed when the products of the present invention are used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the shielding room or the component referred to must have a specific position, be constructed and operated in a specific position, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Some embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

First embodiment

Referring to fig. 1, the present embodiment provides a shielding chamber, which includes a shielding box, a shielding cover 10 and a detector 20, wherein:

the shielding box body comprises an outer shielding body and an inner shielding body, specifically, the outer shielding body is provided with an accommodating cavity, the inner shielding body is installed in the accommodating cavity of the outer shielding body, the accommodating cavity of the outer shielding body and the outer contour of the inner shielding body are arranged in a copying manner, so that the inner side wall of the accommodating cavity of the outer shielding body is in contact with the outer side wall of the inner shielding body, and the inner shielding body is more tightly attached to the outer shielding body.

The inner shield has a measuring cavity, the detector 20 is located in the measuring cavity, the connecting line 30 passes through the shielding box body and is detachably connected with the detector 20, and the connecting line 30 is specifically a data line to supply power and perform a data communication function for the detector 20. The shield cover 10 covers the opening of the measurement chamber. In one possible embodiment, the shield cover 10 covers the inner shield, and the shield cover 10 only contacts the peripheral region of the inner shield at the opening of the measurement chamber. In another possible embodiment, the shielding cover 10 covers the opening of the receiving chamber of the outer shielding body, i.e. covers the entire inner shielding body (including the opening of the measuring chamber).

In the shielding box body, the outer shielding body is detachably connected with the inner shielding body. Specifically, the inner shield and the outer shield may be in a snap-fit connection, a screw connection, or a connection via another locking mechanism, so that the inner shield and the outer shield may be fixed or separated relatively.

In a specific embodiment of this embodiment, the inner shield is provided with a first wiring hole 41, the outer shield is provided with a second wiring hole, and the first wiring hole 41 communicates with the second wiring hole; the connection line 30 communicates with the probe 20 through the plug terminal 31, and the plug terminal 31 can pass through the first wiring hole 41 and the second wiring hole. Specifically, the plug end 31 of the connection line 30 sequentially passes through the second wiring hole and the first wiring hole 41 from the outside of the shielding box body and then extends into the detection chamber 44 of the inner shielding body, so as to be detachably connected with the detector 20 installed in the detection chamber 44. When the probe 20 is separated from the connection section, the region of the connection line 30 outside the shield case can be pulled, so that the connection end is pulled out of the shield case, and the probe 20 can be taken out of the shield cavity.

Further, the plug end 31 is a plug-in quick plug to realize quick assembly and disassembly between the probe 20 and the connection line 30.

In the preferred embodiment of the present invention, the outer shield includes a copper shielding layer 70, a lead shielding layer 60 is coated outside the copper shielding layer 70, and a steel shielding layer 50 is coated outside the lead shielding layer 60; the inner shield includes a glass shield layer 40. Specifically, the steel shielding layer 50 is made of stainless steel, the steel shielding layer 50 covers the outer surface of the lead shielding layer 60, and the inner side surface of the lead shielding layer 60 is attached to the copper shielding layer 70. The glass shielding layer 40 is made of organic glass. The thickness of the lead shield layer 60 may be 100mm and the thickness of the copper shield layer 70 may be 3mm to 5 mm.

In order to fix the inner shield and the outer shield conveniently, as shown in fig. 2, 3, 5 and 6, in the preferred embodiment of the present invention, the outer side surface of the glass shield layer 40 is provided with a fixing portion 42, and the fixing portion 42 is detachably connected with the steel shield layer 50 by a positioning bolt. Specifically, a positioning hole 43 is provided on the fixing portion 42, a threaded hole is provided on the steel shielding layer 50 in a region corresponding to the positioning hole 43, and a positioning bolt is screwed into the threaded hole after passing through the positioning hole 43, so that the fixing portion 42 and the steel shielding layer 50 are fixed to fix the inner shield and the outer shield.

When the inner shield needs to be taken out from the inner side of the outer shield, the positioning bolt is screwed, then a hand or a tool can be inserted into a gap between the fixing part 42 and the steel shielding layer 50, and after the inner shield is lifted for a certain distance, a larger area of the hand or the tool can be inserted between the fixing part 42 and the outer shield, so that the inner shield is continuously lifted upwards, and finally the inner shield is completely taken out from the outer shield.

In specific implementation, the opening of the accommodating chamber of the outer shield and the opening of the measuring chamber of the inner shield face the same direction, and after the shielding cover 10 is closed, the opening of the accommodating chamber and the opening of the measuring chamber are both sealed.

The opening of the measurement chamber may be arranged at a side or top surface of the inner shield. As shown in fig. 1 and 2, preferably, the opening of the measurement chamber is disposed on the top surface of the inner shield, and the shield cover 10 covers the top of the shield box.

After the inner shield is placed in the accommodating cavity of the outer shield, the fixing portion 42 of the inner shield is overlapped on the top surface of the outer shield, and the bottom surface of the fixing portion 42 is in contact with the top surface of the outer shield.

In order to lift the fixing portion 42, a partial region of the fixing portion 42 may extend outward to the outer side of the outer shield, and the size of the fixing portion 42 may be controlled. With this arrangement, when the inner shield is taken out of the outer shield, the holding portion 42 can be held in a region extending to the outside of the outer shield to lift the holding portion 42.

Alternatively, in another preferred embodiment, as shown in fig. 2, the fixing portion 42 contacts with the top surface of the stainless steel shielding layer 50, and the outer edge of the top surface of the stainless steel shielding layer 50 is provided with a snap groove 51. The hander buckling groove 51 extends inwards for a certain distance along the edge area of the top surface of the stainless steel shielding body, so that the gap between the stainless steel shielding layer 50 and the fixing part 42 is increased at the position of the hander buckling groove 51, and a hand or a tool can be extended into the stainless steel shielding layer for a user to lift the inner shielding body conveniently.

It should be noted that the fixing portion 42 may be a ring structure, and the fixing portion 42 is connected to the top peripheral region of the inner shield. Alternatively, the fixing portion 42 may be a plurality of block structures, and the plurality of fixing portions 42 are disposed at intervals along the top peripheral region of the inner shield. The fixing portion 42 and the inner shield are an integral structure.

In the preferred embodiment of the present invention, the shielding cover 10 includes a body made of lead, and a stainless steel cover covering the outer surface of the body. In particular, the thickness of the body is 100 mm.

When the opening of the measurement chamber faces upward, the shielding cover 10 is directly placed on the top surface of the shielding box, and the shielding cover 10 can be covered on the opening of the measurement chamber by gravity. When the opening of the measurement chamber faces the side, a locking member such as a latch may be used to further lock the shield cover 10 with the shield case.

In order to facilitate the removal of the shielding cover 10 from the opening of the measurement chamber, preferably, a sliding groove is provided on the top surface of the shielding box, and a sliding block is provided on the bottom surface of the shielding cover 10, and the sliding block extends into the sliding groove. The slider can be the cylindricality structure, and the cylindricality structure can roll along the spout. With this arrangement, the shield cover 10 can be pushed along the slide groove, thereby exposing the opening of the measurement chamber.

As shown in fig. 3 and 4, in one embodiment, the lead shielding layer 60 includes a base plate 61 and a plurality of annular bodies 62, the plurality of annular bodies 62 are stacked on the base plate 61, the annular bodies 62 are provided with grooves and protrusions 63, and the protrusions 63 of the annular bodies 62 extend into the grooves of the adjacent annular bodies 62.

So set up for lead shielding layer 60 divides into a plurality of parts, makes respectively and carries in making and handling, thereby can avoid because the great problem that is unfavorable for production and transport of lead shielding layer 60 whole weight.

In fig. 3, the lead shielding layer 60 includes five parts, specifically, a bottom plate 61 and four annular bodies 62, a protrusion 63 is disposed at the bottom of the annular body 62, a groove is disposed at the top of the annular body 62, the number of the protrusions 63 may be one or more, and the protrusions 63 and the grooves are disposed in a one-to-one manner. The projection 63 may be an annular projection 63.

The shielding cage may be a cylindrical structure, in particular, the measurement chamber of the shielding cage is also a cylindrical area.

The probe 20 is placed in the measurement chamber, as shown in fig. 1 and 2, one end of the probe 20 has a relatively large size, and the other end of the probe 20 has a relatively small size, so that the shielding box can be set to be a diameter-variable cylinder matched with the structural shape of the probe 20. As shown in fig. 1 and 2, the shielding box includes a first cylinder and a second cylinder, the cover covers one end of the first cylinder, the second cylinder is connected to the other end of the first cylinder, the inner diameter of the first cylinder is greater than the inner diameter of the second cylinder, and the outer diameter of the first cylinder is greater than the inner diameter of the second cylinder. It should be noted that the first cylinder and the second cylinder are only used to divide the shielding box into two regions according to the size of the shielding box, and they are named separately.

So set up for the shielding box is the structure of falling convex, and the accommodation space of the top region of measuring chamber is great relatively, and the accommodation space of bottom region is less relatively. After the probe 20 is placed in the measurement chamber, the smaller-sized end of the probe 20 is inserted into the second cylinder so that the smaller-sized end of the probe 20 is located in the first cylinder.

Specifically, the steel shielding layer 50, the lead shielding layer 60, the copper shielding layer 70 and the organic glass shielding layer 40 are all of a reducing cylinder structure, and the shielding layers are sequentially nested. The reducing structure also plays a role in limiting relative positions of the shielding layers, and relative movement of the shielding layers is avoided.

In a preferred embodiment of this embodiment, as shown in fig. 1 and 2, the shielding chamber further includes a supporting platform 80, the shielding box is mounted on the supporting platform 80, and the bottom of the supporting platform 80 is mounted with rollers. So configured, the shielded room can be moved by pushing the support platform 80. Furthermore, a brake structure is arranged on the roller, and the brake structure can be a brake pad.

As shown in fig. 1 and 2, the supporting platform 80 includes a bearing plate and a pillar, the pillar is supported below the bearing plate, and the shielding box is placed above the bearing plate. The rollers may be mounted below the post or at the bottom region of the side of the post.

Second embodiment

The present embodiment provides a low background gamma spectrometer comprising the shielding chamber provided in the first embodiment described above.

Because in the shield room among the low background gamma energy spectrometer, the internal shield can be taken out from the external shield, and the detector can be taken out from the internal shield, consequently can carry out more thorough cleanness to internal shield and detector, consequently can clear away the probe surface and the inner chamber surface radioactive contamination of detector to alleviate or avoid because of the measurement error that the washing is not clean leads to, improve the measurement accuracy of low background gamma energy spectrometer.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A shielding chamber is characterized by comprising a shielding box body, a shielding cover body and a detector,

2. The shielded room of claim 1, wherein the inner shield body is provided with a first wiring hole, and the outer shield body is provided with a second wiring hole, the first wiring hole communicating with the second wiring hole; the connecting wire passes through the grafting end with the detector intercommunication, the grafting end can pass first wiring hole with the second wiring hole.

3. The shielding chamber according to claim 1 or 2, wherein the outer shielding body comprises a copper shielding layer, a lead shielding layer is coated outside the copper shielding layer, and a steel shielding layer is coated outside the lead shielding layer; the inner shield includes a glass shield layer.

4. The shielding chamber as claimed in claim 3, wherein the outer side of the glass shielding layer is provided with a fixing part, and the fixing part is detachably connected with the steel shielding layer through a positioning bolt.

5. The shielded room of claim 4, wherein the fixing portion is in contact with a top surface of the steel shielding layer, and an outer edge of the top surface of the steel shielding layer is provided with a snap groove.

6. The shielded room of claim 1, wherein the shield cover includes a body made of lead, and a stainless steel cover covering an outer surface of the body.

7. The shielding chamber according to claim 3, wherein the lead shielding layer comprises a bottom plate and a plurality of annular bodies, the annular bodies are stacked on the bottom plate, the annular bodies are provided with grooves and protrusions, and the protrusions of the annular bodies extend into the grooves of the adjacent annular bodies.

8. The shielding chamber of claim 1, wherein the shielding box comprises a first cylinder and a second cylinder, the cover covers one end of the first cylinder, the second cylinder is connected to the other end of the first cylinder, the inner diameter of the first cylinder is larger than that of the second cylinder, and the outer diameter of the first cylinder is larger than that of the second cylinder.

9. The shielded room of claim 1 further comprising a support platform, wherein the shielded enclosure is mounted on the support platform, and rollers are mounted on the bottom of the support platform.

10. A low background gamma spectrometer comprising a shielded chamber according to any one of claims 1 to 9.