CN110082817B

CN110082817B - Gamma spectrometer radioactivity measurement sample box positioner

Info

Publication number: CN110082817B
Application number: CN201910211581.6A
Authority: CN
Inventors: 贺行良; 常文博; 李承峰; 何乐龙; 刁少波
Original assignee: Ocean University of China
Current assignee: Ocean University of China
Priority date: 2019-03-20
Filing date: 2019-03-20
Publication date: 2020-02-21
Anticipated expiration: 2039-03-20
Also published as: CN110082817A

Abstract

The invention provides a gamma energy spectrometer radioactivity measurement sample box positioner, and belongs to the field of radioactivity detection. The locator is made of organic materials and comprises a probe adapter and a sample box locating body, wherein the probe adapter is annular, and the inner diameter of the probe adapter can be expanded outwards and retracted; the sample box positioning body is formed by nesting an inner ring and an outer ring, the outer ring is fixedly arranged on the probe adapter, and the inner ring rotates in a single direction relative to the outer ring; three rotating pieces are arranged on the ring surface of the outer ring at equal intervals, one end of each rotating piece is rotatably connected with the outer ring, the other end of each rotating piece points to the center of the inner ring to form a regular triangle, and the center of the triangle is superposed with the center of the inner ring; the ring surface of the inner ring is provided with three detachable limiting columns which limit the rotation of the rotating sheet at equal intervals. The positioner can ensure that the sample box is in direct contact with the probe and is positioned at the central position of the probe, thereby ensuring high detection efficiency and accurate detection result.

Description

Gamma spectrometer radioactivity measurement sample box positioner

Technical Field

The invention belongs to the technical field of sample radioactivity detection, and particularly relates to a positioner for a gamma energy spectrometer radioactivity measurement sample box.

Background

In gamma spectrometry radioactivity measurement, the density, geometry and water content of a sample, the material, density and thickness of a sample box, the measurement position of the sample at a probe, and other factors are all closely related. Wherein the influence of the position of the sample cartridge at the probe (center alignment, separation distance, etc.) on the sample radioactivity measurement is easily overlooked by the test subject. The probe of the gamma spectrometer is a cylindrical plane, and the optimal measurement position of the sample box is the central line position of the probe, and is preferably in direct contact with the plane of the probe. If the sample box deviates from the center of the probe or is spaced from the probe by a large distance, the repeatability and accuracy of the measurement result of the sample are poor. The existing positioning operation method is mainly used for directly placing the sample box on the probe, and the sample box placed each time is difficult to be accurately positioned at the central position of the probe. In the prior art, there is a sample box fixing device, which includes an upper base for placing a sample box, a lower base fixedly connected with a probe, and a clamping portion for fixing the sample box; the probes are fixed by adopting a two-screw symmetrical fixing method, and a set of lower base cannot be suitable for accurately fixing probes with different diameters; the presence of a certain separation distance between the sample cartridge and the probe may cause a reduction in the efficiency of the detection of the radioactivity in the sample.

Disclosure of Invention

Aiming at the problem that the existing fixing device cannot simultaneously ensure that a sample box is positioned at the central position of a probe and ensure that the sample box is in direct contact with the probe as much as possible in the radioactivity measurement of a gamma energy spectrometer, the invention provides the radioactivity measurement sample box positioner which can be adapted to probes with different diameters, ensure that the sample box placed in each time is positioned at the central position of the probe, ensure that the sample box can be in direct contact with the probe and ensure the radioactivity detection efficiency of the sample and the accuracy and stability of a detection result.

The invention is realized by the following technical scheme:

a gamma energy spectrometer radioactivity measurement sample box positioner is made of organic materials and comprises a probe adapter and a sample box positioner, wherein the probe adapter is annular, and the inner diameter of the probe adapter can be expanded outwards and retracted; the sample box positioning body is formed by nesting an inner ring and an outer ring, the outer ring is fixedly arranged on the probe adapter, and the inner ring rotates in a single direction relative to the outer ring; three rotating pieces are arranged on the ring surface of the outer ring at equal intervals, one end of each rotating piece is rotatably connected with the outer ring, the other end of each rotating piece points to the center of the inner ring to form a regular triangle, and the center of the triangle is superposed with the center of the inner ring; the anchor ring of inner ring is equidistant to set up three restriction revolving fragment pivoted spacing post, and spacing post is located the outside of revolving fragment and can dismantle with the inner ring and be connected, still sets up stealthy toggle device on the anchor ring of inner ring.

Furthermore, a sliding groove is formed in the inner edge of the bottom of the outer ring, a convex ring is arranged at the corresponding position of the inner ring, or a convex ring is arranged on the inner edge of the bottom of the outer ring, and a groove is formed at the corresponding position of the inner ring.

Furthermore, a supporting table is arranged at the bottom of the outer ring in the circumferential direction, and the inner ring is arranged on the supporting table.

Furthermore, gear teeth are arranged on the outer edge of the inner ring, a positioning clamp is arranged between every two adjacent rotating sheets, one end of each positioning clamp is fixedly arranged on the outer ring, the other end of each positioning clamp is inserted into a tooth groove of the corresponding unidirectional tooth, and the height of each positioning clamp is lower than that of each rotating sheet.

Furthermore, a groove is formed in the ring surface of the outer ring, and the positioning clamp is arranged in the groove.

Furthermore, three holes are formed in the inner ring at equal intervals, and the limiting columns are inserted into the holes.

Further, the limiting column is in threaded connection with the inner ring.

Furthermore, the inner edge of the probe adapter body is provided with an elastic claw which is used for being clamped on the probe.

Furthermore, a silica gel ring is arranged on the inner edge of the probe adapter body, and the inner wall of the silica gel ring is wavy.

Furthermore, the invisible toggle device on the inner ring is a groove with anti-skid patterns.

According to the radioactivity measurement sample box positioner, the adapter body adopts an elastic telescopic fixing mode, can be tightly combined with the probes and is suitable for probes with different diameter specifications; the positioning body can be freely matched and adjusted according to the height and the diameter of the sample box; by utilizing the three rotating pieces of the positioning body, a sample can be accurately placed each time, and the position of the sample is always fixed on the center line of the circle center of the probe, so that sample boxes with different sizes can be ensured to be positioned at the center position of the probe, and the accuracy and precision of a detection result are ensured; meanwhile, the positioner can realize the direct contact between the sample box and the probe plane, and the detection efficiency is not influenced.

Drawings

FIG. 1 is a schematic diagram of a radioactivity measuring locator of a sample box of a gamma energy spectrometer;

FIG. 2 is a schematic structural diagram of an adapter of the probe of the embodiment;

FIG. 3 is a schematic view of another embodiment of an adapter for a probe;

FIG. 4 is a top view of an initial state of the positioner of an embodiment;

FIG. 5 is a top view of an embodiment fixture holding a sample cartridge;

FIG. 6 is a top view of an embodiment of a positioner as it is repositioned;

fig. 7-9 are schematic views of three connection relationships between the outer ring and the inner ring according to the embodiment.

In each of the above figures, 1, a sample cartridge positioning body; 11. an outer ring; 111. a rotating sheet; 112. positioning the card; 12. an inner ring; 121. a limiting column; 122. a shifting device; 2. a probe aptamer; 21. an elastic claw; 22. a silica gel ring; 3. and (4) a sample box.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments and the accompanying drawings.

Examples

The embodiment provides a radioactivity measurement sample box positioner, which is used for radioactivity measurement of a gamma energy spectrometer, and the positioner is made of organic materials, such as ABS, PC and the like. As shown in fig. 1, the positioner is composed of an upper part and a lower part, wherein the lower part is a probe adapter body 2 used for being installed on a probe, and the upper part is a sample box positioning body 1 used for fixing the position of a sample box on the probe.

As shown in fig. 2, the body of the probe adapter body 2 is annular, and the inner edge is provided with an elastic claw 21 clamped on the probe. The resilient jaws 21 are able to telescope within a range to accommodate probes of different outer diameters. The probe adapter body 2 can also be designed into a structure with a telescopic inner diameter, as shown in fig. 3, a silica gel ring 22 is arranged on the inner edge of the probe adapter body 2, the silica gel ring 22 is wavy, and the top end of the silica gel ring 22 can be elastically deformed, so that the probe adapter body is suitable for probes with different outer diameters.

As shown in fig. 4, the sample positioning body 1 is also annular and is formed by nesting an inner ring 12 and an outer ring 11, the outer ring 11 is fixedly arranged on the probe adapter 2, the outer ring 11 and the body of the probe adapter 2 are integrally formed, or other fixed connection modes such as clamping, threaded connection and bonding are adopted, no special limitation is provided, but a non-metallic material is required. The central axis of the inner ring 12 is collinear with the central axis of the probe adaptor 2.

As shown in fig. 4, three rotating plates 111 are arranged on the ring surface of the outer ring 11 at equal intervals, one end of each rotating plate 111 is a fixed end, a hole is formed in the fixed end, a rotating rod is fixedly arranged on the ring surface of the corresponding outer ring, the rotating plates 111 can rotate around the rotating shaft, three limiting columns 121 are arranged on the ring surface of the inner ring 12 at equal intervals, and the limiting columns 121 are located on the outer side of the rotating plates 111 and used for limiting the rotation of the rotating plates 111 so as to ensure that the positions of the rotating plates 111 are fixed. The rotary blade 111 is of sufficient length that its free end points towards the centre of the inner ring 12 and forms a regular triangle, the centre of which coincides with the centre of the inner ring to ensure that the sample holder is fixed in position at the centre of the probe.

The inner ring 12 rotates in one direction relative to the outer ring 11, as shown in fig. 4, the outer edge of the inner ring 12 is provided with one-way gear teeth, a positioning clip 112 is arranged between two adjacent rotating pieces 111, one end of the positioning clip 112 is fixedly arranged on the outer ring 11, the other end of the positioning clip is inserted into a tooth socket of the one-way gear teeth, and the positioning clip 112 has certain resilience, so that the one-way rotation of the inner ring can be allowed, and the reverse rotation of the inner ring can be prevented.

As shown in fig. 7, the inner edge of the bottom of the outer ring 11 is provided with a sliding groove, and a convex ring is arranged at a corresponding position of the inner ring 12, or as shown in fig. 8, the inner edge of the bottom of the outer ring 11 is provided with a convex ring, and a corresponding position of the inner ring 12 is provided with a groove, or as shown in fig. 9, the bottom of the outer ring 11 is annularly provided with a saddle, the inner ring 12 is arranged on the saddle, and the inner ring 12 rotates relative to the outer ring 11 without falling off. The connection mode of the inner ring 12 and the outer ring 11 is not limited to the above three types, and may be simply modified as long as the inner ring 12 can rotate relative to the outer ring 11 in the circumferential direction and cannot fall off at will. For convenience of illustration, the gear teeth on the inner ring, the rotary plate and other parts of the probe adapter are omitted from fig. 7-9.

Considering that the installation is convenient, the outer ring 11 may be formed by two half rings which are buckled together or bonded together, and those skilled in the art may select other connection modes as needed, which is not described herein.

Fig. 4 shows an initial state of the positioner, the rotating plate 111 is located at the edge of the inner ring, the position-limiting columns 121 are located at the outer side of the rotating plate 111 and approximately at the middle position of the rotating plate 111, one of the position-limiting columns 121 is adjacent to the positioning clamp 112, the direction shown by the arrow in the figure is the rotating direction of the inner ring 12, the sample box 3 is placed in the inner ring 12, the inner ring 12 is rotated according to the direction shown by the arrow, the position-limiting columns 121 gradually approach the fixed end of the rotating plate 111, the three rotating plates 111 gradually move towards the inner ring under the pushing of the position-limiting columns 121, and finally are clamped at the outer edge of the sample box 3, the inner ring 12 cannot rotate in the opposite direction due to the action of the positioning clamp 112, and therefore, the position of the.

In order to facilitate the rotation of the inner ring 12, the ring surface of the inner ring 12 is provided with invisible toggle devices 122, which may be grooves, preferably grooves with anti-skid patterns, and 2-3 toggle devices 122 may be designed as required.

In order to facilitate the resetting of the rotating piece 111, the limiting column 121 is detachably connected with the inner ring 12. The simple mode is plug-in connection, namely three holes are arranged on the inner ring at equal intervals, and the limiting column 121 is inserted in the holes; or the limiting column 121 is in threaded connection with the inner ring. As shown in fig. 6, when the rotating piece needs to be reset, the limiting column 121 is pulled out, the rotating piece 111 is pulled to the outer side of the outer ring 11, the inner ring 12 is further rotated to the initial position, then the rotating piece 111 is pulled back to the initial position, and the limiting column 121 is inserted into the inner ring 12, that is, the state shown in fig. 4 is returned.

In order to adjust the position of the rotating plate 111 conveniently, the height of the positioning clip 112 is lower than that of the rotating plate, as shown in fig. 4-6, a groove is formed on the ring surface of the outer ring 11, and the positioning clip 112 is placed in the groove.

The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention made by those skilled in the art without departing from the design of the present invention shall fall within the protection scope defined by the claims of the present invention.

Claims

1. A gamma energy spectrometer radioactivity measurement sample box positioner is characterized in that the positioner is made of organic materials and comprises a probe adapter and a sample box positioner, wherein the probe adapter is annular, and the inner diameter of the probe adapter can be expanded outwards and retracted; the sample box positioning body is formed by nesting an inner ring and an outer ring, the outer ring is fixedly arranged on the probe adapter body, the inner ring rotates in a single direction relative to the outer ring, the outer ring and the probe adapter body are integrally formed or fixedly connected, and the central axis of the inner ring and the central axis of the probe adapter body are on the same straight line;

three rotating pieces are arranged on the ring surface of the outer ring at equal intervals, one end of each rotating piece is rotationally connected with the outer ring, the other end of each rotating piece points to the center of the inner ring to form a regular triangle, the center of the triangle is overlapped with the center of the inner ring, a one-way gear is arranged on the outer edge of the inner ring, a positioning clamp is arranged between every two adjacent rotating pieces, one end of each positioning clamp is fixedly arranged on the outer ring, the other end of each positioning clamp is inserted into a gear groove of the one-way gear, and the height of each positioning clamp;

the ring surface of the inner ring is provided with three holes and three limiting columns for limiting the rotation of the rotating sheet at equal intervals, the limiting columns are inserted into the holes, the limiting columns are located on the outer side of the rotating sheet and detachably connected with the inner ring, and the ring surface of the inner ring is further provided with an invisible shifting device.

2. The retainer of claim 1, wherein the bottom inner edge of the outer ring is provided with a sliding groove and the corresponding position of the inner ring is provided with a convex ring, or the bottom inner edge of the outer ring is provided with a convex ring and the corresponding position of the inner ring is provided with a groove.

3. The locator of claim 1, wherein the bottom of the outer ring is circumferentially provided with a saddle and the inner ring is placed on the saddle.

4. The locator of claim 1, wherein the outer ring has a groove formed in an annular surface thereof, and the locator card is disposed in the groove.

5. The locator of claim 1, wherein the stop post is threadedly connected to the inner ring.

6. A positioner according to claim 1, wherein the inner edge of the probe adapter body is provided with resilient fingers for latching onto the probe.

7. The positioner according to claim 1, wherein a silicone ring is arranged on the inner edge of the probe adapter, and the inner wall of the silicone ring is wavy.

8. The retainer of claim 1, wherein the invisible toggle on the inner ring is a groove with a skid-resistant pattern.