A survey instrument for gamma ray inspection and activity measurement

Abstract

The present invention discloses a patrol meter for gamma ray inspection and activity measurement, comprising a shell, the upper side wall of the shell is rotatably connected with a rotating plate, the end of the rotating plate is connected with a baffle, the lower side wall of the shell is provided with an arc-shaped opening, the arc-shaped opening is provided with an arc-shaped plate, the upper side wall of the arc-shaped plate is fixedly connected with a connecting rod, the upper end of the connecting rod penetrates the shell, the lower side wall of the rotating plate is provided with a slide groove, the inner walls on both sides of the slide groove are provided with limiting grooves, and a slide rod is slidably provided in the limiting groove. The advantage is that the present invention fixes the patrol meter on the arm through the arc-shaped plate and the strap, so that the patrol meter is portable, and the rotating plate is rotated after fixing, so that the baffle no longer blocks the end, which is convenient for the measurement work, and the baffle blocks again after the measurement is completed, avoiding the problem of damage or contamination of the sensor end, and realizing the activity measurement of radioactive nuclides on the basis of gamma dose rate measurement.

Description

Technical Field

[0001] The invention relates to the technical field of gamma rays, and in particular to a gamma ray inspection and activity measurement inspection instrument. Background Art

[0002] Gamma rays, also known as gamma particle streams, are rays released when the energy level of an atomic nucleus transitions and de-excites. They are electromagnetic waves with a wavelength shorter than 0.01 angstroms, an energy higher than 1.24 MeV, and a frequency of more than 300 EHz. Gamma rays have strong penetrating power and can be used in industry for flaw detection or automatic control of assembly lines. Gamma rays are lethal to cells and are used in medicine to treat tumors.

[0003] In the field of gamma-ray radiation measurement, gas detectors, scintillation detectors, and semiconductor detectors are commonly used. The equipment records the number of nuclear radiation particles and analyzes them to obtain the gamma dose rate, but cannot directly obtain the activity of radioactive nuclides.

[0004] To solve the above problems, we proposed a γ-ray inspection and activity measurement instrument. Summary of the invention

[0005] The purpose of the present invention is to solve the problems in the background technology and to propose a gamma ray inspection and activity measurement inspection instrument.

[0006] In order to achieve the above-mentioned objectives, the present invention adopts the following technical scheme: a patrol instrument for gamma-ray inspection and activity measurement, comprising a shell, an upper side wall of the shell being rotatably connected to a rotating plate, an end of the rotating plate being connected to a baffle, an arc-shaped opening being provided on the lower side wall of the shell, an arc-shaped plate being provided in the arc-shaped opening, a connecting rod being fixedly connected to the upper side wall of the arc-shaped plate, an upper end of the connecting rod passing through the shell, a sliding groove being provided on the lower side wall of the rotating plate, limiting grooves being provided on both sides of the inner walls of the sliding groove, a sliding rod being slidably provided in the limiting groove, the upper end of the connecting rod being rotatably connected to the outer wall of the sliding rod, and two straps being fixedly connected to the lower side wall of the shell, one of the ends of the straps being fixedly connected to a buckle.

[0007] In the above-mentioned gamma-ray inspection and activity measurement inspection instrument, a slot is provided on one side of the baffle plate close to the shell, a fixing bar is slidably inserted in the slot, and a wiping sponge is fixed on the fixing bar.

[0008] In the above-mentioned gamma-ray inspection and activity measurement inspection instrument, a slide groove is provided on the buckle, the strap is inserted in the slide groove, a cavity connected to the inside of the slide groove is opened in the buckle, a ratchet and ratchet teeth matching the ratchet are installed in the cavity, the outer wall of the ratchet is in contact with the outer wall of the strap, a connecting tube is fixed on the inner wall of the cavity, a moving rod is slidably provided in the connecting tube, a compression spring is fixedly connected between the end of the moving rod and the inner wall of the connecting tube, and the other end of the moving rod is rotated A connecting rod is movably connected, and the other end of the connecting rod is rotatably connected to the outer wall of the ratchet. A pressing groove is opened on the upper side wall of the buckle, and a pressing plate is rotatably connected in the pressing groove. A vertical rod is slidably inserted into the lower side wall of the pressing groove. The lower end of the vertical rod is located in the cavity and a trapezoidal block is fixed thereto. A cylinder is fixed on the outer wall of the moving rod, and the inclined surface of the trapezoidal block contacts the cylinder. A telescopic spring is sleeved on the outer wall of the vertical rod, and the two ends of the telescopic spring are respectively fixedly connected to the top wall in the cavity and the outer wall of the vertical rod.

[0009] In the above-mentioned gamma-ray inspection and activity measurement inspection instrument, a magnet block is fixed to the inner wall of the pressing groove, and a magnet plate adsorbed to the magnet block is fixedly embedded at the end of the pressing plate.

[0010] In the above-mentioned gamma-ray inspection and activity measurement inspection instrument, the outer wall of the movable rod is fixedly connected to a limit block.

[0011] In the above-mentioned gamma-ray inspection and activity measurement patrol instrument, a patrol module is provided in the shell, and the patrol module includes a scintillation sensor and a microprocessor module. The scintillation sensor is connected to the microprocessor module, and the microprocessor module includes a display module, a power module, an alarm module, a button module, a storage module and a communication module.

[0012] In the above-mentioned gamma-ray inspection and activity measurement inspection instrument, the microprocessor module is also connected to a laser / ultrasonic module, and the distance between the gamma-ray calibration source and the measurement point is detected by the laser / ultrasonic module;

[0013] Calculate the exposure rate of the Y point source in the γ-ray calibration source: The relationship between the exposure rate at a point in the radiation field of the Y point source, the activity of the radiation source, and the distance between the point and the radiation source can be expressed by the following formula:

[0014] Where:

[0015] X—exposure rate at a distance R from the source, R / h (roentgen / hour);

[0016] AY is the activity of the point source, Ci (Curie);

[0017] R-the distance from the geometric center of the radiation source to a certain point, m (meter);

[0018] The dose rate constant or Γ constant of a Γ-Y point source radionuclide, R·m2·h -1 ·Ci -1 (Len Mi 2 ·hour -1 Curie -1 ).

[0019] In the above-mentioned gamma-ray inspection and activity measurement inspection instrument, the microprocessor module is also connected to an energy spectrum measurement module, and the count rate of the total energy peak is obtained through the energy spectrum measurement module. The total energy peak area is calculated according to the total energy peak count rate, absolute detection efficiency and measurement time. The calibration coefficient is obtained by testing the gamma-ray calibration source, and the dose rate and activity of the radionuclide at the current position are calculated:

[0020]

[0021] Where: S j - the activity of the jth nuclide efficiency scale, Bq;

[0022] A jis -The total energy peak area of ​​the i-th characteristic peak of the j-th nuclide efficiency calibration source, s -1 .

[0023] Compared with the existing technology, the advantages of this gamma ray inspection and activity measurement instrument are:

[0024] The present invention fixes the survey instrument on the arm through the arc plate and the strap, so that the survey instrument is portable, and after fixation, the rotating plate is rotated so that the baffle no longer blocks the end, which is convenient for measurement. After the measurement is completed, the baffle blocks again, avoiding the problem of damage or contamination of the sensor end, and realizing the activity measurement of radionuclides based on the gamma dose rate measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the internal structure of a gamma ray inspection and activity measurement inspection instrument proposed by the present invention;

[0026] Figure 2 This is an end view of a gamma ray inspection and activity measurement inspection instrument proposed by the present invention;

[0027] Figure 3 A schematic diagram of the structure of a buckle in a gamma ray inspection and activity measurement inspection instrument proposed by the present invention;

[0028] Figure 4 Module distribution diagram of a gamma ray inspection and activity measurement inspection instrument in Embodiment 1 of the present invention

[0029] Figure 5 This is a module distribution diagram of a second embodiment of a gamma-ray inspection and activity measurement patrol instrument proposed by the present invention.

[0030] In the figure: 1 shell, 2 rotating plate, 3 baffle, 4 limiting groove, 5 arc plate, 6 connecting rod, 7 buckle, 8 sliding rod, 9 strap, 10 arc mouth, 11 ratchet, 12 compression spring, 13 moving rod, 14 limiting block, 15 connecting rod, 16 vertical rod, 17 trapezoidal block, 18 cylinder, 19 pressing plate, 20 magnet block, 21 ratchet. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] Embodiment 1

[0034] Reference Figure 1-3A patrol instrument for gamma-ray inspection and activity measurement, comprising a shell 1, the upper side wall of the shell 1 is rotatably connected to a rotating plate 2, the end of the rotating plate 2 is connected to a baffle 3, a slot is provided on the side of the baffle 3 close to the shell 1, a fixing strip is slidably inserted in the slot, and a wiping sponge is fixed on the fixing strip. The lower side wall of the shell 1 is provided with an arc-shaped opening 10, an arc-shaped plate 5 is provided in the arc-shaped opening 10, a connecting rod 6 is fixedly connected to the upper side wall of the arc-shaped plate 5, and the upper end of the connecting rod 6 passes through the shell 1, a slide groove is provided on the lower side wall of the rotating plate 2, and limiting grooves 4 are provided on both sides of the inner wall of the slide groove, a sliding rod 8 is slidably provided in the limiting groove 4, and the upper end of the connecting rod 6 is rotatably connected to the outer wall of the sliding rod 8, and two straps 9 are fixedly connected to the lower side wall of the shell 1, and a buckle 7 is fixedly connected to the end of one of the straps 9. When carrying the patrol instrument, The arc plate 5 of the survey instrument is placed on the arm, the end of the strap 9 passes through the buckle 7 and is continuously pulled to move the arc plate 5 upward, the arc plate 5 and the strap 9 are pressed against the arm, and the buckle 7 fixes the strap 9. During the upward movement of the arc plate 5, the connecting rod 6 moves upward, driving the slide bar 8 to slide in the slide groove and lift up the rotating plate 2, so that the baffle 3 no longer blocks the end of the survey instrument, so that the end of the scintillation sensor, laser / ultrasonic sensor or energy spectrum measurement module is exposed, and the gamma ray activity can be measured.

[0035] A slide groove is provided on the buckle 7, and the strap 9 is inserted in the slide groove. A cavity connected to the inside of the slide groove is provided in the buckle 7, and a ratchet 21 and a ratchet 11 matching the ratchet 21 are installed in the cavity. The outer wall of the ratchet 21 contacts the outer wall of the strap 9. A connecting pipe is fixed on the inner wall of the cavity, and a moving rod 13 is slidably provided in the connecting pipe. The outer wall of the moving rod 13 is fixedly connected to a limit block 14, and the moving rod 13 is limited by the limit block 14. When the ratchet 21 is reversed, the ratchet 11 is driven to rotate in the opposite direction, and the connecting rod 15 is connected to the moving rod 13. The moving rod 13 is pulled to move outward, and the movement is prevented by the limit block 14, so the ratchet 21 cannot be reversed, ensuring that the ratchet 21 is pressed against the strap 9, so that the strap 9 cannot move from the slide slot, ensuring the stability of the connection between the strap 9 and the arm, a compression spring 12 is fixedly connected between the end of the moving rod 13 and the inner wall of the connecting tube, the other end of the moving rod 13 is rotatably connected to the connecting rod 15, and the other end of the connecting rod 15 is rotatably connected to the outer wall of the ratchet 11, and a pressing groove is provided on the upper side wall of the buckle 7, and a pressing spring 12 is rotatably connected in the pressing groove. The pressing plate 19 has a magnet block 20 fixed to the inner wall of the pressing groove, and a magnet plate adsorbed to the magnet block 20 is fixedly embedded at the end of the pressing plate 19. The magnetism between the magnet block 20 and the magnet plate is used to stabilize the pressing plate 19 to prevent the pressing plate 19 from shaking up and down. A vertical rod 16 is slidably inserted into the lower side wall of the pressing groove, and the lower end of the vertical rod 16 is located in the cavity and fixed with a trapezoidal block 17. A cylinder 18 is fixed to the outer wall of the moving rod 13, and the inclined surface of the trapezoidal block 17 contacts the cylinder 18. The outer wall of the vertical rod 16 is sleeved with a telescopic spring. The two ends of the telescopic spring are fixedly connected to the top wall of the cavity and the outer wall of the vertical rod 16 respectively. When the strap 9 is pulled out, the pressing plate 19 is pressed downward, and the pressing plate 19 squeezes the vertical rod 16 to move downward. The trapezoidal block 17 moves downward to squeeze the cylinder 18 and the moving rod 13 to move away from the ratchet 21. The ratchet 11 is pulled forward by the connecting rod 15 to disengage the ratchet 11 from the ratchet 21. At this time, the ratchet 21 can be reversed, and the strap 9 can be pulled to the side away from the buckle 7. The strap 9 is disengaged from the buckle 7 by the reversal of the ratchet 21.

[0036] A patrol module is provided in the housing 1, and the patrol module includes a scintillation sensor and a microprocessor module. The scintillation sensor is connected to the microprocessor module. The microprocessor module includes a display module, a power module, an alarm module, a key module, a storage module and a communication module. The microprocessor module is also connected to a laser / ultrasonic module, and the distance between the γ-ray calibration source and the measurement point is detected by the laser / ultrasonic module; the distance between the Y point source in the γ-ray calibration source is measured by the laser / ultrasonic module, and the irradiation rate of the Y point source in the γ-ray calibration source is calculated: the relationship between the irradiation rate at a certain point in the radiation field of the Y point source, the activity of the radiation source and the distance between the certain point and the radiation source can be expressed by the following formula:

[0037] Where:

[0038] X—exposure rate at a distance R from the source, R / h (roentgen / hour);

[0039] AY is the activity of the point source, Ci (Curie);

[0040] R-the distance from the geometric center of the radiation source to a certain point, m (meter);

[0041] The dose rate constant or Γ constant of a Γ-Y point source radionuclide, R·m2·h -1 ·Ci -1 (Len Mi 2 ·hour -1 Curie -1 ).

[0042] The specific operation steps include: Step 1: The signal is transmitted to the microcontroller through the scintillator detector, SIPM photoelectric sensor, amplifier circuit and signal conditioning circuit, and the microcontroller processes the data to obtain the γ dose rate. Step 2: The microcontroller obtains the distance from the γ inspection instrument to the calibration source radioactive nuclide through the upper laser ranging module. Step 3: Using the characteristics of the radioactive nuclide itself, the γ dose rate at the current position and the activity of the calibration source radioactive nuclide are calculated.

[0043] Embodiment 2

[0044] Reference Figure 4 , which is different from the first embodiment in that: the microprocessor module is also connected to an energy spectrum measurement module, and the count rate of the total energy peak is obtained through the energy spectrum measurement module.

[0045] The count rate of the total energy peak is obtained through the energy spectrum measurement module. The total energy peak area is calculated based on the total energy peak count rate, absolute detection efficiency and measurement time. The calibration coefficient is obtained by testing the gamma-ray calibration source, and the dose rate and activity of the radionuclide at the current position are calculated:

[0046]

[0047] Where: S j - the activity of the jth nuclide efficiency scale, Bq;

[0048] A jis -The total energy peak area of ​​the i-th characteristic peak of the j-th nuclide efficiency calibration source, s -1The specific operation steps include: adding an energy spectrum measurement module to the scintillation sensor, using a microcontroller to process data to obtain the total energy peak count rate, and calculating the total energy peak area based on the total energy peak count rate, absolute detection efficiency and measurement time. The calibration coefficient can be obtained by testing the calibration source and the source being tested at the same time. Combining the calibration coefficient at the previous moment and the total energy peak area of ​​the current nuclide being tested, the dose rate at the current position and the activity of the radionuclide can be calculated.

[0049] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A gamma ray inspection and activity measurement inspection instrument, comprising a housing (1), characterized in that: The upper side wall of the shell (1) is rotatably connected to a rotating plate (2), and the end of the rotating plate (2) is connected to a baffle (3). The lower side wall of the shell (1) is provided with an arc-shaped opening (10), and an arc-shaped plate (5) is arranged in the arc-shaped opening (10). The upper side wall of the arc-shaped plate (5) is fixedly connected to a connecting rod (6), and the upper end of the connecting rod (6) passes through the shell (1). The lower side wall of the rotating plate (2) is provided with a sliding groove, and the inner walls on both sides of the sliding groove are provided with limiting grooves (4). A sliding rod (8) is slidably arranged in the limiting groove (4), and the upper end of the connecting rod (6) is rotatably connected to the outer wall of the sliding rod (8). The lower side wall of the shell (1) is fixedly connected to two straps (9), and one end of the strap (9) is fixedly connected to a buckle (7).

2. A gamma ray inspection and activity measurement inspection instrument according to claim 1, characterized in that: A slot is provided on one side of the baffle plate (3) close to the housing (1), a fixing strip is slidably inserted into the slot, and a wiping sponge is fixed on the fixing strip.

3. A gamma ray inspection and activity measurement inspection instrument according to claim 1, characterized in that: The buckle (7) is provided with a slide groove, the strap (9) is inserted in the slide groove, the buckle (7) is provided with a cavity connected with the inside of the slide groove, a ratchet (21) and a ratchet tooth (11) matching the ratchet (21) are installed in the cavity, the outer wall of the ratchet (21) is in contact with the outer wall of the strap (9), a connecting tube is fixed on the inner wall of the cavity, a moving rod (13) is slidably arranged in the connecting tube, a compression spring (12) is fixedly connected between the end of the moving rod (13) and the inner wall of the connecting tube, the other end of the moving rod (13) is rotatably connected with a connecting rod (15), and the connecting tube is provided with a plurality of connecting rods (13) connected to the inner wall of the connecting tube. The other end of the rod (15) is rotatably connected to the outer wall of the ratchet (11); a pressing groove is provided on the upper side wall of the buckle (7); a pressing plate (19) is rotatably connected in the pressing groove; a vertical rod (16) is slidably inserted into the lower side wall of the pressing groove; the lower end of the vertical rod (16) is located in the cavity and is fixed with a trapezoidal block (17); a cylinder (18) is fixed on the outer wall of the movable rod (13); the inclined surface of the trapezoidal block (17) is in contact with the cylinder (18); a telescopic spring is sleeved on the outer wall of the vertical rod (16); and the two ends of the telescopic spring are respectively fixedly connected to the top wall of the cavity and the outer wall of the vertical rod (16).

4. A gamma ray inspection and activity measurement inspection instrument according to claim 3, characterized in that: A magnet block (20) is fixed on the inner wall of the pressing groove, and a magnet plate adsorbed to the magnet block (20) is fixedly embedded at the end of the pressing plate (19).

5. A gamma ray inspection and activity measurement inspection instrument according to claim 3, characterized in that: The outer wall of the moving rod (13) is fixedly connected to a limiting block (14).

6. A gamma ray inspection and activity measurement inspection instrument according to claim 1, characterized in that: The housing (1) is provided with a patrol module, the patrol module comprising a flicker sensor and a microprocessor module, the flicker sensor is connected to the microprocessor module, and the microprocessor module comprises a display module, a power module, an alarm module, a key module, a storage module and a communication module.

7. A gamma ray inspection and activity measurement inspection instrument according to claim 6, characterized in that: The microprocessor module is also connected to a laser / ultrasonic module, and the distance between the gamma-ray calibration source and the measuring point is detected by the laser / ultrasonic module; Calculate the exposure rate of the Y point source in the γ-ray calibration source: The relationship between the exposure rate at a point in the radiation field of the Y point source, the activity of the radiation source, and the distance between the point and the radiation source can be expressed by the following formula: Where: X—exposure rate at a distance R from the source, R / h (roentgen / hour); AY is the activity of the point source, Ci (Curie); R-the distance from the geometric center of the radiation source to a certain point, m (meter); The dose rate constant or Γ constant of a Γ-Y point source radionuclide, R·m 2 ·h -1 ·Ci -1 (Len Mi 2 ·hour -1 Curie -1 ).

8. A gamma ray inspection and activity measurement inspection instrument according to claim 6, characterized in that: The microprocessor module is also connected to an energy spectrum measurement module, through which the count rate of the total energy peak is obtained. According to the total energy peak count rate, absolute detection efficiency and measurement time, the total energy peak area is calculated. The calibration coefficient is obtained by testing the gamma ray calibration source, and the dose rate and activity of the radionuclide at the current position are calculated: Where: Sj-activity of the jth nuclide efficiency scale, Bq; Ajis-the total energy peak area of ​​the i-th characteristic peak of the j-th nuclide efficiency calibration source, s -1 .

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