A mobile system for on-site calibration of neutron / gamma dose instruments

Abstract

The present invention relates to a calibration device for a neutron / gamma dose instrument, and in particular to a mobile on-site calibration system for a neutron / gamma dose instrument, in order to solve the technical problem that when the radiation level of neutrons or gammas is calibrated on-site, the radiation is large and the risk of on-site adjustment by staff is high. The system includes a movable support unit, an azimuth adjustment unit and a control unit; the azimuth adjustment unit includes a lifting adjustment component, a rotation adjustment component and a horizontal adjustment component arranged on a chassis bracket from bottom to top; the horizontal adjustment component includes a bottom plate, a first movable plate and a second movable plate, the bottom plate is fixedly connected to the rotation adjustment component, and the first movable plate and the second movable plate can move in opposite directions in the horizontal direction; the control unit is arranged on the upper end surface of the chassis bracket, and is used to control the movable support unit and the azimuth adjustment unit, and transmit signals to and from the remote control room.

Description

Technical Field

[0001] The invention relates to a calibration device for a neutron / gamma dose instrument, in particular to a mobile on-site calibration system for a neutron / gamma dose instrument. Background Art

[0002] Currently, when calibrating the radiation level of a neutron dose instrument or a gamma dose instrument in a nuclear working environment, it is risky for workers to enter the site, and a movable platform needs to be built to achieve on-site calibration of the neutron / gamma dose instrument. Summary of the invention

[0003] The present invention aims to solve the technical problems of high radiation and high risk of on-site adjustment for staff when calibrating the radiation level of neutrons or gammas on-site, and proposes a mobile on-site calibration system for neutron / gamma dose instruments.

[0004] The technical solution of the present invention is:

[0005] A mobile system for on-site calibration of a neutron / gamma dose instrument, which is special in that it comprises a movable support unit, an azimuth adjustment unit and a control unit;

[0006] The movable support unit includes a chassis bracket and wheels arranged under the chassis bracket;

[0007] The azimuth adjustment unit comprises a lifting adjustment component, a rotation adjustment component and a horizontal adjustment component which are arranged on the chassis bracket in sequence from bottom to top;

[0008] The horizontal adjustment assembly comprises a bottom plate, a first movable plate and a second movable plate, the first movable plate and the second movable plate can move in opposite directions in the horizontal direction, and the bottom plate is fixedly connected to the rotation adjustment assembly;

[0009] A standard dosimeter is provided at one end of the upper surface of the first movable plate, and a camera device is provided at the other end;

[0010] A generator and a detector are arranged on the upper surface of the second movable plate at one end away from the standard dosimeter; the detector is used to monitor the intensity of the radiation field emitted by the generator;

[0011] The azimuth adjustment unit is used to make the standard dosimeter, the generator and the instrument to be calibrated on the same horizontal plane, and the generator is located on the mid-vertical line of the line connecting the standard dosimeter and the instrument to be calibrated;

[0012] The standard dosimeter is a standard neutron dosimeter, the generator is a neutron generator, and the detector is a neutron detector;

[0013] Alternatively, the standard dosimeter is a standard gamma dosimeter, the generator is an X-ray generator, and the detector is a gamma detector;

[0014] Alternatively, the generator is a neutron generator and an X-ray generator, the detector is a neutron detector and a gamma detector, and the standard dosimeter is a corresponding standard neutron dosimeter or a standard gamma dosimeter; the neutron generator and the X-ray generator are arranged side by side in the vertical direction of the second movable plate, and the neutron detector and the gamma detector are correspondingly arranged on one side of the neutron generator and the X-ray generator;

[0015] The control unit is arranged on the upper end surface of the chassis bracket, and is used to control the movable support unit and the azimuth adjustment unit, and to transmit signals to and from the remote control room.

[0016] Further, the lifting and adjusting assembly includes a lower fixed plate, a lower lifting plate, an upper fixed plate and an upper lifting plate, which are arranged in sequence from bottom to top on the upper end surface of the chassis bracket, as well as a plurality of lifting screws, a plurality of support rods, a plurality of guide rods and a driving assembly arranged on the lower fixed plate;

[0017] The upper end surface of the upper lifting plate is provided with a rotation adjustment component;

[0018] One end of the lifting screw is connected to the driving assembly, and the other end passes through the lower lifting plate and is connected to the upper fixed plate, and the lower lifting plate can move up and down along the lifting screw;

[0019] The support rod passes through the upper fixed plate and is fixedly arranged between the upper lifting plate and the lower lifting plate, and the support rod can move up and down relative to the upper fixed plate;

[0020] The guide rod passes through the lower lifting plate and is fixedly arranged between the lower fixing plate and the upper fixing plate. The lower lifting plate can move up and down along the guide rod.

[0021] Furthermore, the number of the lifting screws is 4, and the connection line of the setting positions of the 4 lifting screws on the lower fixed plate forms a rectangle.

[0022] Further, the driving assembly includes a motor, a first coupling, a first steering gear, two second couplings, two second steering gears respectively connected to the two second couplings, and two pairs of lead screw driving units respectively connected to the two second steering gears;

[0023] The lead screw drive unit comprises a third coupling connected to the second steering gear and a reducer connected to the third coupling; the reducer is used to drive the lifting lead screw.

[0024] Furthermore, the generator is fixed to the upper surface of the second movable plate through a generator bracket and a first nut, and the generator horizontally extends out of the second movable plate toward an end away from the standard dosimeter;

[0025] The detector is fixed to the upper surface of the second movable plate through a detector bracket and a second nut.

[0026] Furthermore, it also includes a positioning grating sensor and a distance sensor arranged on the second movable plate;

[0027] The positioning grating sensor is coaxially arranged with the horizontal center axis of the generator and is used to locate the position of the generator;

[0028] The distance sensor is used to measure the distance from the generator to the standard dose meter and the distance from the generator to the instrument to be calibrated.

[0029] Furthermore, a laser emitter is arranged directly above or below the generator, and the laser emitter emits a first laser beam, a second laser beam and a third laser beam arranged in sequence on the same plane, the second laser beam intersects with the midpoint of the line connecting the standard dosimeter and the instrument to be calibrated; the angle between the first laser beam and the second laser beam is equal to the angle between the second laser beam and the third laser beam, the first laser beam is aimed at the standard dosimeter, and the third laser beam is aimed at the instrument to be calibrated, so that the generator is located on the perpendicular bisector of the line connecting the standard dosimeter and the instrument to be calibrated.

[0030] Further, the neutron generator is a deuterium-deuterium neutron generator;

[0031] The connection line between the deuterium-deuterium neutron generator and the standard neutron dose meter is L3, the connection line between the deuterium-deuterium neutron generator and the instrument to be calibrated is L4, and the angle between L3 and L4 is less than 60°.

[0032] Furthermore, the camera device includes a camera bracket and a camera arranged on the upper surface of the first movable plate; the camera bracket is used to adjust the pitch and horizontal angles.

[0033] Beneficial effects of the present invention:

[0034] 1. When calibrating a neutron / gamma dose instrument on site, on the one hand, the on-site space is small and the remote control operation is limited. On the other hand, the instrument to be calibrated is fixed on a wall on one side, which further increases the difficulty of debugging the on-site calibration. The present invention realizes on-site calibration of the neutron / gamma dose instrument under limited space by the coordinated cooperation of the lifting adjustment component, the rotation adjustment component and the horizontal adjustment component provided on the remotely controllable mobile system.

[0035] 2. The horizontal adjustment component provided on the system provided by the present invention increases the distance between the generator and the standard dosimeter by arranging the standard neutron / gamma dosimeter and the neutron / X-ray generator at two ends away from each other after the first movable plate and the second movable plate are unfolded, thereby facilitating the debugging of the measurement angle.

[0036] 3. The system provided by the present invention is provided with a camera device, which can not only read the values ​​of the standard dosimeter and the instrument to be calibrated, but also monitor the on-site environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the structure of an embodiment of a mobile system for on-site calibration of a neutron / gamma dose instrument of the present invention;

[0038] Figure 2 A top view of the structure of an embodiment of a mobile system for on-site calibration of a neutron / gamma dose instrument of the present invention;

[0039] Figure 3 Schematic diagram of the three-dimensional structure of the level adjustment assembly in the embodiment of the present invention (working state);

[0040] Figure 4 This is a front view of a level adjustment component in an embodiment of the present invention;

[0041] Figure 5 It is a side view of the level adjustment assembly in the embodiment of the present invention (working state);

[0042] Figure 6 A top view of a level adjustment assembly in an embodiment of the present invention (in working state);

[0043] Figure 7 A top view of a level adjustment assembly in an embodiment of the present invention (non-working state);

[0044] Figure 8 This is a schematic diagram of the structure of a driving component of a lifting and adjusting component in an embodiment of the present invention;

[0045] Fig. 9 This is a schematic diagram of the layout of the lifting screw, guide rod and support rod that are arranged through the lower lifting plate in an embodiment of the present invention.

[0046] The reference numerals are as follows:

[0047] 1- movable support unit, 101- chassis bracket, 102- wheels;

[0048] 2-lifting adjustment assembly, 201-lower fixed plate, 202-lower lifting plate, 203-upper fixed plate, 204-upper lifting plate, 205-driving assembly, 2051-motor, 2052-first coupling, 2053-first steering gear, 2054-second coupling, 2055-second steering gear, 2056-third coupling, 2057-reducer, 206-lifting screw, 207-guide rod, 208-support rod;

[0049] 3- Rotation adjustment assembly;

[0050] 4-horizontal adjustment assembly, 401-first movable plate, 402-second movable plate, 403-standard neutron dosimeter, 404-pressure plate, 405-pressure ring, 406-camera device, 407-neutron generator, 408-neutron detector, 409-generator bracket, 410-detector bracket, 411-second nut, 412-positioning grating sensor, 413-distance sensor, 414-base plate. DETAILED DESCRIPTION

[0051] Example 1

[0052] This embodiment provides a mobile system for on-site calibration of a neutron dose instrument, such as Figure 1 and Figure 2 As shown, the system includes a movable supporting unit 1, an orientation adjusting unit and a control unit.

[0053] The movable support unit 1 includes a chassis bracket 101 and wheels 102 arranged under the chassis bracket 101. The movable support unit 1 provides support for the entire neutron dose instrument on-site calibration mobile system, and the remote control room can control the working position of the neutron dose instrument on-site calibration mobile system by sending a signal to the control unit.

[0054] The azimuth adjustment unit includes a lifting adjustment component 2, a rotation adjustment component 3 and a horizontal adjustment component 4 which are arranged on the chassis bracket 101 from bottom to top; it can be understood that the neutron dose instrument on-site calibration mobile system is in a radiation environment when in use and personnel cannot enter. The neutron dose instrument to be calibrated is fixed on the wall and the measurement space is limited. Therefore, the system places higher requirements on the azimuth adjustment unit.

[0055] The lifting and adjusting assembly 2 includes a lower fixed plate 201, a lower lifting plate 202, an upper fixed plate 203 and an upper lifting plate 204, which are arranged from bottom to top, and four lifting screws 206, six support rods 208, four guide rods 207 and a driving assembly 205 arranged on the lower fixed plate 201. The layout of the lifting screws 206, the support rods 208 and the guide rods 207 on the lower lifting plate 202 is shown in FIG. Fig. 9 ; A rotation adjustment component 3 is provided on the upper end surface of the upper lifting plate 204; one end of the lifting screw 206 is connected to the driving component 205, and the other end passes through the lower lifting plate 202 and is connected to the upper fixed plate 203, and the lower lifting plate 202 can slide up and down along the lifting screw 206; the support rod 208 passes through the upper fixed plate 203 and is fixedly arranged between the upper lifting plate 204 and the lower lifting plate 202, and the support rod 208 can slide up and down relative to the upper fixed plate 203; the guide rod 207 passes through the lower lifting plate 202 and is fixedly arranged between the lower fixed plate 201 and the upper fixed plate 203, and the lower lifting plate 202 can slide up and down along the guide rod 207.

[0056] During operation, the driving component 205 is started and controlled to drive the lifting screw 206. The lifting screw 206 pushes the lower lifting plate 202 to move upward. The lower lifting plate 202 transmits force through the support rod 208 to push the upper lifting plate 204 to move upward, thereby realizing the upward adjustment of the rotation adjustment component 3 and the horizontal adjustment component 4. The guide rod 207 is arranged between the upper fixed plate 203 and the lower fixed plate 201 to play a guiding and supporting role. The lifting screw 206 mentioned here can be a T-type ball screw or other screw structure that can realize lifting and limiting functions.

[0057] See also Figure 8 The driving assembly 205 includes a motor 2051, a first coupling 2052, a first steering gear 2053, a second coupling 2054, a second steering gear 2055 and four screw drive units connected in sequence; the screw drive unit includes a third coupling 2056 connected to the second steering gear 2055 and a reducer 2056 connected to the third coupling 2056; the reducer 2056 is used to drive the lifting screw 206.

[0058] The drive assembly 205 is a four-axis linkage H-shaped structure and adopts a reducer 2056. Together with the balanced layout of the lifting screw 206, the support rod 208 and the guide rod 207, the lifting adjustment can ensure the stability and accuracy of the lifting movement at different positions, and can achieve better self-locking function under high load and static load conditions. For example, the weight of the moving part of the lifting platform itself (30 kg) plus the weight of the rotating table (20 kg) and the weight of the translation table (12 kg * 2 = 24 kg), the load on the platform is 25 kg, and the total weight is: 99 kg; if the four-axis linkage structure is not adopted, the horizontal displacement target point distance is 1.5 meters, and there will be an overload situation; the motor 2051 can use a stepper motor, and if the lifting speed and accuracy requirements are very high, the driving part can use a servo motor.

[0059] like Figure 3-Figure 7 As shown, the horizontal adjustment component 4 includes a base plate 414, a first movable plate 401 and a second movable plate 402. The base plate 414 is fixedly connected to the rotation adjustment component 3. The first movable plate 401 and the second movable plate 402 can move in opposite directions in the horizontal direction. The movement of the first movable plate 401 and the second movable plate 402 adopts a ball screw plus a linear guide rail. The ball screw adopts a three-bearing mounting structure, and the guide rail is a precision linear slider guide rail, which is comfortable to move and has a large load-bearing capacity and is suitable for high-speed reciprocating use.

[0060] A standard neutron dosimeter 403 is arranged at one end of the upper surface of the first movable plate 401, and the standard neutron dosimeter 403 is fixed on the first movable plate by a pressure plate 404 and a pressure ring 405; a camera device 406 is arranged at the other end; the standard neutron dosimeter 403 is a neutron dosimeter calibrated by a standard method; the camera device 406 includes a camera bracket and a camera arranged on the upper surface of the first movable plate 401; the camera bracket is used for adjusting the pitch and horizontal angles; the remote control room reads the measurement results of the standard neutron dosimeter 403 and the neutron dosimeter to be calibrated through the camera device 406, and monitors the platform use environment in real time.

[0061] A neutron generator 407 and a neutron detector 408 are provided on the upper surface of the second movable plate 402 at one end away from the standard neutron dosimeter 403; specifically, the neutron generator 407 is fixed to the upper surface of the second movable plate 402 by a generator bracket 409 and a first nut, and the emission end of the neutron generator 407 extends horizontally from the second movable plate 402 toward the end away from the standard neutron dosimeter 403, thereby increasing the distance between the neutron generator 407 and the standard neutron dosimeter 403 and the neutron dosimeter to be calibrated, and facilitating the adjustment of the angle and position; the neutron detector 408 is fixed to the upper surface of the second movable plate 402 by a detector bracket 410 and a second nut 411; the neutron detector 408 and the neutron generator 407 are arranged at the same end of the second movable plate 402, and the neutron detector 408 is used to monitor the neutron radiation field intensity emitted by the neutron generator 407 to ensure that the dose equivalent range of the neutron generator 407 meets the dose equivalent range of the standard neutron dosimeter 403 and the neutron dosimeter to be calibrated.

[0062] The upper surface of the second movable plate 402 is also provided with a positioning grating sensor 412 and a distance sensor 413. The positioning grating sensor 412 is coaxially arranged with the horizontal center axis of the generator and is used to locate the position of the generator; the distance sensor 413 is used to measure the distance from the generator to the standard dose meter and the distance from the generator to the neutron dose instrument to be calibrated.

[0063] The rotating adjustment component 3 is an electric rotating platform. The bearing steel material used in the rotating shaft system is precisely machined, with high matching accuracy and large load-bearing capacity. The turbine worm structure is precisely matched, and the table top can rotate forward and backward at will, with comfortable movement and minimal backlash. Due to the limitation of the test space, when the neutron dose instrument on-site calibration mobile platform enters the on-site calibration, the setting direction of the first movable plate 401 and the second movable plate 402 is along the direction of the forward movement of the neutron dose instrument on-site calibration mobile platform. When the platform reaches the appropriate position, the rotating adjustment component 3 needs to be adjusted to a certain angle so that the positional relationship between the standard neutron dose meter 403, the neutron dose meter to be calibrated and the neutron generator 407 meets the requirements. It is necessary to ensure the length of the first movable plate 401 and the second movable plate 402, and to ensure the mobile operation in the working environment of the platform. The setting of the rotating adjustment component 3 facilitates the control of the platform and makes the calibration position easier to adjust.

[0064] The azimuth adjustment unit is used to make the standard neutron dosimeter 403, the neutron generator 407 and the neutron dose instrument to be calibrated in the same horizontal plane, and the neutron generator 407 is located on the perpendicular bisector of the line connecting the standard neutron dosimeter 403 and the neutron dose instrument to be calibrated, that is, the distance between the standard neutron dosimeter 403 and the neutron generator 407 is equal to the distance between the neutron dose instrument to be calibrated and the neutron generator 407, the line connecting the standard neutron dosimeter 403 and the neutron dose instrument to be calibrated is L1, the vertical line connecting the neutron generator 407 and L1 is L2, and L2 intersects with the center of L1; specifically, the neutron generator 407 is a deuterium-deuterium neutron generator; preferably, the line connecting the deuterium-deuterium neutron generator and the standard neutron dose 403 is L3, the line connecting the deuterium-deuterium neutron generator and the neutron dose instrument to be calibrated is L4, and the angle between L3 and L4 is less than 60°; a laser emitter is arranged directly above or below the deuterium-deuterium neutron generator, and the laser emitter emits a first laser beam, a second laser beam and a third laser beam arranged in sequence on the same plane, and the second laser beam intersects with the midpoint of the line connecting the standard neutron dose meter 403 and the neutron dose instrument to be calibrated; the angle α1 between the first laser beam and the second laser beam and the angle α2 between the second laser beam and the third laser beam are equal, the first laser beam is aligned with the standard dose meter, and the third laser beam is aligned with the neutron dose instrument to be calibrated, so as to make the generator located on the perpendicular midline of the line connecting the standard dose meter and the neutron dose instrument to be calibrated.

[0065] The control unit is arranged on the upper end surface of the chassis bracket 101, and is used to control the movable support unit 1 and the azimuth adjustment unit, and to transmit signals to and from the remote control room.

[0066] The debugging process of the mobile platform for on-site calibration of the neutron dose instrument:

[0067] Assemble and check the mobile platform for on-site calibration of neutron dose instruments as described above to ensure that all components are normal; in the remote control room, send a signal to the control unit to control the movable support unit 1 to enter the calibration site and move to a suitable position; at this time, the extension direction of the first movable plate 401 and the second movable plate 402 is the same as the platform movement direction, adjust the rotation adjustment component 3 to ensure that after the first movable plate 401 and the second movable plate 402 are unfolded, the standard neutron dose meter 403 on the first movable plate 401 is close to the neutron dose instrument to be calibrated installed on the wall, and the standard neutron dose meter 403 on the second movable plate 402 is close to the neutron dose instrument to be calibrated installed on the wall. The neutron generator 407 is moved away from the standard neutron dosimeter 403; then, the first movable plate 401 and the second movable plate 402 are unfolded, and the lifting adjustment component 2, the rotation adjustment component 3 and the horizontal adjustment component 4 are adjusted, so that the distance between the standard neutron dosimeter 403 and the neutron generator 407 is equal to the distance between the neutron dose instrument to be calibrated and the neutron generator 407, and the standard neutron dosimeter 403 and the neutron dose instrument to be calibrated are geometrically symmetrical relative to the neutron generator 407; the adjusted platform state is locked in the remote control room, and calibration of the neutron dose instrument to be calibrated can begin.

[0068] Example 2

[0069] This embodiment provides a mobile platform for on-site calibration of gamma dosimeters. The difference between this platform and Embodiment 1 is that a standard gamma dosimeter is used to calibrate the standard gamma dosimeter and the gamma dosimeter to be calibrated through an X-ray generator and a gamma detector. The rest of the structure is the same.

[0070] Example 3

[0071] This embodiment provides a mobile platform for on-site calibration of neutron or gamma dose instruments. The difference between this platform and embodiment 1 is that the neutron generator 407 and the X-ray generator are arranged side by side along the vertical direction of the second movable plate 402, the neutron detector 408 and the gamma detector are arranged on one side of the neutron generator 407 and the X-ray generator respectively, and a grating bracket is arranged at the lower end of the corresponding positioning grating sensor 412. The height of the grating bracket is adjustable to meet the calibration of the neutron dose instrument to be calibrated or the gamma dose instrument to be calibrated. When the neutron dose instrument to be calibrated is calibrated on-site, the standard neutron dose meter 403 is installed on the first movable plate 401, and the neutron generator 407 and the neutron detector 408 are started; when the gamma dose instrument to be calibrated is calibrated on-site, the standard gamma dose meter is installed on the first movable plate 401, and the X-ray generator and the gamma detector are started, and the rest of the structure is the same.

Claims

1. A mobile system for on-site calibration of neutron / gamma dose instruments, characterized in that: It comprises a movable support unit (1), an orientation adjustment unit and a control unit; The movable support unit (1) comprises a chassis support (101) and wheels (102) arranged under the chassis support (101); The azimuth adjustment unit comprises a lifting adjustment component (2), a rotation adjustment component (3) and a horizontal adjustment component (4) which are arranged on the chassis bracket (101) in sequence from bottom to top; The horizontal adjustment assembly (4) comprises a bottom plate (414), a first movable plate (401) and a second movable plate (402), the first movable plate (401) and the second movable plate (402) move in opposite directions in the horizontal direction, and the bottom plate (414) is fixedly connected to the rotation adjustment assembly (3); A standard dosimeter is provided at one end of the upper surface of the first movable plate (401), and a camera device (406) is provided at the other end; A generator and a detector are arranged on one end of the upper surface of the second movable plate (402) away from the standard dosimeter; The detector is used to monitor the intensity of the radiation field emitted by the generator; The azimuth adjustment unit is used to make the standard dosimeter, the generator and the instrument to be calibrated on the same horizontal plane, and the generator is located on the mid-vertical line of the line connecting the standard dosimeter and the instrument to be calibrated; The standard dosimeter is a standard neutron dosimeter (403), the generator is a neutron generator (407), and the detector is a neutron detector (408); Alternatively, the standard dosimeter is a standard gamma dosimeter, the generator is an X-ray generator, and the detector is a gamma detector; Alternatively, the generator is a neutron generator (407) and an X-ray generator, the detector is a neutron detector (408) and a gamma detector, and the standard dosimeter is a corresponding standard neutron dosimeter (403) or a standard gamma dosimeter; the neutron generator (407) and the X-ray generator are arranged side by side in a vertical direction of the second movable plate (402), and the neutron detector (408) and the gamma detector are arranged on one side of the neutron generator (407) and the X-ray generator respectively; The control unit is arranged on the upper end surface of the chassis bracket (101), and is used to control the movable support unit (1) and the azimuth adjustment unit, and to transmit signals to and from the remote control room; The lifting and adjusting assembly (2) comprises a lower fixed plate (201), a lower lifting plate (202), an upper fixed plate (203) and an upper lifting plate (204) which are arranged in sequence from bottom to top on the upper end surface of the chassis bracket (101), as well as a plurality of lifting screws (206), a plurality of support rods (208), a plurality of guide rods (207) and a driving assembly (205) arranged on the lower fixed plate (201); The upper end surface of the upper lifting plate (204) is provided with a rotation adjustment component (3); One end of the lifting screw (206) is connected to the driving assembly (205), and the other end passes through the lower lifting plate (202) and is connected to the upper fixed plate (203), and the lower lifting plate (202) moves up and down along the lifting screw (206); The support rod (208) passes through the upper fixed plate (203) and is fixedly arranged between the upper lifting plate (204) and the lower lifting plate (202), and the support rod (208) moves up and down relative to the upper fixed plate (203); The guide rod (207) passes through the lower lifting plate (202) and is fixedly arranged between the lower fixed plate (201) and the upper fixed plate (203); the lower lifting plate (202) moves up and down along the guide rod (207).

2. The mobile system for on-site calibration of neutron / gamma dose instrument according to claim 1, characterized in that: The number of the lifting screws (206) is four, and a line connecting the locations of the four lifting screws (206) on the lower fixed plate (201) forms a rectangle.

3. The mobile system for on-site calibration of neutron / gamma dose instrument according to claim 2, characterized in that: The driving assembly (205) comprises a motor (2051), a first coupling (2052), a first steering gear (2053), two second couplings (2054), two second steering gears (2055) respectively connected to the two second couplings (2054), and two pairs of lead screw driving units respectively connected to the two second steering gears (2055); The lead screw drive unit comprises a third coupling (2056) connected to the second steering gear (2055) and a reducer (2057) connected to the third coupling (2056); the reducer (2057) is used to drive the lifting lead screw (206).

4. The mobile system for on-site calibration of neutron / gamma dose instrument according to any one of claims 1 to 3, characterized in that: The generator is fixed to the upper surface of the second movable plate (402) through a generator bracket and a first nut, and the generator horizontally extends out of the second movable plate (402) toward an end away from the standard dose meter; The detector is fixed on the upper surface of the second movable plate (402) via a detector bracket (410) and a second nut (411).

5. The mobile system for on-site calibration of neutron / gamma dose instrument according to claim 4, characterized in that: It also includes a positioning grating sensor (412) and a distance sensor (413) arranged on the second movable plate (402); The horizontal center axis of the positioning grating sensor (412) is coaxial with the 0° emission direction of the generator and is used to locate the position of the generator; The distance sensor (413) is used to measure the distance from the generator to the standard dose meter and the distance from the generator to the instrument to be calibrated.

6. The mobile system for on-site calibration of neutron / gamma dose instrument according to claim 5, characterized in that: A laser emitter is arranged directly above or below the generator, and the laser emitter emits a first laser beam, a second laser beam and a third laser beam which are arranged in sequence on the same plane, and the second laser beam intersects with the midpoint of the line connecting the standard dosimeter and the instrument to be calibrated; the angle between the first laser beam and the second laser beam is equal to the angle between the second laser beam and the third laser beam, the first laser beam is aimed at the standard dosimeter, and the third laser beam is aimed at the instrument to be calibrated, so that the generator is located on the perpendicular midline of the line connecting the standard dosimeter and the instrument to be calibrated.

7. The mobile system for on-site calibration of neutron / gamma dose instrument according to claim 6, characterized in that: The neutron generator (407) is a deuterium-deuterium neutron generator; The connection line between the deuterium-deuterium neutron generator and the standard neutron dose meter (403) is L3, the connection line between the deuterium-deuterium neutron generator and the instrument to be calibrated is L4, and the angle between L3 and L4 is less than 60°.

8. The mobile system for on-site calibration of neutron / gamma dose instrument according to claim 7, characterized in that: The camera device (406) comprises a camera bracket arranged on the upper surface of the first movable plate (401) and a camera arranged on the camera bracket; the camera bracket is used to adjust the pitch and horizontal angles.

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