KR101174384B1 - Control method of gamma irradiation equipment for the calibration of radiation surveymeter - Google Patents

Abstract

PURPOSE: A controlling method of a gamma ray radiating device for correcting a radiation measuring device is provided to displays a gamma ray radiating width on a correction supporting stand in a real time basis according to a distance between a collimator and the correction supporting stand by efficiently correcting the operation of a gamma ray radiating device for correcting a radiation measuring device. CONSTITUTION: A controlling method of a gamma ray radiating device for correcting a radiation measuring device comprises is as follows. A radiation irradiating angle of a collimator being mounted on a lead shielding body is input(S100). A tanθ is computed as an half of the radiation irradiating angle of the collimator based on the radiation irradiating angle of the collimator(S110). A rail trolley is transferred to a correction position(S120). A distance between the rail trolley and the collimator is measured when a position of the rail trolley is settled(S140). A gamma ray radiating width is computed(S150). A dislocation value of a rotary shaft of a motor member among laser radiating devices for displaying the gamma ray radiating width corresponding to the computed gamma ray radiating width is computed(S160).

Description

Control Method of Gamma Irradiation Equipment for The Calibration of Radiation Surveymeter

The present invention relates to a control method of a gamma-ray irradiation apparatus for calibration of radiation measuring equipment, and more particularly, the irradiation width of radiation irradiated through a collimator from a source that changes according to the distance of the calibration equipment support when calibrating the radiation measuring equipment. Is displayed visually on the calibrated pedestal so that the calibration worker can place the radiation measuring equipment within the range of the calibrated radiation on the calibrated pedestal so that the calibration can be performed more quickly and accurately. The present invention relates to a control method of a gamma-ray irradiation apparatus for calibrating a radiation-measuring device that can efficiently and efficiently calibrate a radiation-measuring device by controlling the gamma-ray irradiation device.

In general, the radiation measuring equipment is calibrated periodically using a gamma source for accurate radiation measurement, the conventional calibration gamma irradiation apparatus is equipped with a collimator on the front, the lead shielding body with a built-in gamma source, the upper surface A rail support having a rail and a distance indication thereon, the rail support being fixed horizontally in front of the lead shielding body, a rail moving trolley mounted on the rail support rail and moving along the rail, and plate-shaped, It is installed horizontally on the upper side, and the calibration support for placing the calibration target radiation measuring equipment on the upper surface, and the height adjustment device is installed between the rail moving cart and the calibration support to adjust the height of the calibration support.

However, the gamma ray irradiation device for calibration of conventional radiation measuring equipment having the above-described configuration is irradiated with gamma rays through the collimator, and the collimator has a radiation port having a diameter larger than that of the rear end of the collimator. As the calibration support mounted on the sensor moves away from the collimator, the audit beam irradiation on the calibration support becomes wider, and as the calibration support approaches the collimator, the audit ship irradiation on the calibration support becomes narrower. Since there is no indication of the gamma irradiation range on the calibration butt, the operator cannot confirm whether a plurality of calibration devices placed on the calibration base are placed within the gamma radiation, so often the calibration device is calibrated. Out of position or across the boundary of the gamma-irradiation Do not conduct the accurate correction value or the like as placed there is a problem in this is being an error occurs in the radiation measurements.

Applicants have made various attempts in view of the above-described conventional problems, and as a result, by adjusting the distance from the gamma source, the intensity of the gamma ray is adjusted to calibrate the radiographic measurement equipment for each region such as high level, medium level and low level. When visualizing the gamma rays irradiated on the calibration pedestal visually, the calibration worker visually checks the gamma rays and then arranges the radiation measuring equipment in the irradiation area. A gamma-ray irradiation apparatus for calibrating radiation measuring equipment was developed so that the work can be carried out quickly and accurately, and its configuration can be seen in FIGS. 1A, 1B, 1C, 2 and 4, and a collimator ( 12) and a lead shield 11 having a gamma source 13 embedded therein, and a rail 14a and a distance display on the upper surface thereof. And a rail support 14 which is horizontally fixed to the front of the lead shield 11, and which is mounted on the rail 14a of the rail support 14 and moves along the rail 14a. 15) and a plate, horizontally installed on the upper side of the rail moving trolley 15, a calibration support 16 for arranging the radiographic measuring equipment on the upper surface, the rail moving trolley 15 and the calibration support ( 16 is a laser range finder 21 and a distance measuring laser reflector on a gamma ray irradiating apparatus for calibrating a conventional radiation measuring apparatus, which is composed of a height adjusting device 17 installed between 16 to adjust the height of the calibration base 16. 22), the laser irradiation apparatus 30 for gamma ray irradiation width display, the gamma ray irradiation width display 23, and the control part 24 are comprised.

The present invention efficiently controls the operation of the gamma-ray irradiation apparatus for calibration of the applicant's radiation measuring equipment as described above, the display of the gamma-ray irradiation width displayed on the calibration pedestal according to the distance between the calibration pedestal and the gamma source and the calibration pedestal in real time By quickly and accurately displaying the gamma-ray irradiation area on the calibration base, the operator can easily place the radiation measuring equipment to be calibrated in the gamma-ray irradiation area on the calibration base so that calibration can be performed quickly and easily. An object of the present invention is to provide a method of controlling a gamma ray irradiation device for calibrating equipment.

An object of the present invention is a collimator is mounted on the front portion, and the lead shielding body is embedded with a gamma source; A rail support; A rail moving trolley mounted on the rail of the rail support and moving; A calibration support horizontally installed above the rail moving trolley; A height adjusting device for adjusting the height of the calibration pedestal; A laser range finder for measuring a distance between the collimator and the rail moving cart; A distance measuring laser reflector reflecting a distance measuring laser emitted from the laser range finder; A gamma-ray irradiation width display laser irradiation device for irradiating a laser indicating an irradiation width of gamma rays irradiated through a collimator of a lead shielding body upwardly according to the gamma-ray irradiation width; A gamma ray irradiation width display for receiving a gamma ray irradiation width display laser emitted from the gamma ray irradiation width display laser irradiation apparatus on a lower surface thereof and displaying the gamma ray irradiation width display laser on an upper surface thereof; A flow sensing means mounted on the rail moving trolley to sense the movement of the rail moving trolley; It is electrically connected to the laser range finder, the gamma ray irradiation width display laser irradiation device and the flow sensing means, respectively, and calculates the gamma ray irradiation width according to the distance value and the angle value of the collimator, and the interval of the gamma ray display laser according to the result value. A control unit controlling the; In the gamma-ray irradiation apparatus for calibration of radiation measuring equipment consisting of an input means for electrically inputting the angle of the collimator is electrically connected to the control unit, the control method of the irradiation apparatus for inputting the irradiation angle of the collimator mounted on the lead shielding body; A collimator irradiation angle input step; A tan θ value calculating step of calculating tan θ based on the irradiation angle of the collimator to 1/2 of the irradiation angle of the collimator; A rail moving cart moving step of moving the rail moving cart to a calibration position; Confirming the position of the rail moving cart and checking the position of the rail moving cart to return to the rail moving cart moving step when the position is not determined; A distance measuring step of measuring a distance between the rail moving cart and the collimator when the position of the rail moving cart is determined; Gamma irradiation to calculate gamma-ray irradiation width (ie, length from a straight line to an arbitrary point in the forward direction of the collimator) by a formula (distance measurement value x tan θ) which multiplies the distance measurement value by the calculated tan θ value. A width calculation step; A rotating shaft potential value calculating step of calculating a rotating shaft potential value of the motor means corresponding to the calculated gamma ray irradiation width; A gamma ray irradiation width display step of driving a motor means by the calculated rotation axis potential value to display a gamma ray irradiation width on a gamma ray irradiation width display; Checking whether there is a flow of the rail moving cart, and if there is no flow, checking the gamma ray irradiation width display step; A distance measuring step of measuring a distance between the collimator and the rail moving cart when there is a flow of the rail moving cart; A distance measurement value comparison step of comparing the distance value measured in the distance measurement step with a previous distance measurement value; A distance measurement value checking step of confirming whether the measured distance value is smaller or larger than the previous distance measurement value; A gamma ray irradiation width and a rotation axis potential value calculating step of calculating a gamma ray irradiation width and a rotation axis potential value of the motor means when the distance measurement value measured in the distance measurement value checking step is smaller than a previous distance measurement value; A motor means reverse driving step of driving the motor means in a reverse direction by the calculated value of the rotational shaft potential of the motor means and then returning to the rail moving cart flow checking step; A gamma ray irradiation width and a rotation axis potential value calculating step of calculating a gamma ray irradiation width and a rotation axis potential value of the motor means when the distance measurement value measured in the distance measurement value checking step is larger than a previous distance measurement value; Control of the gamma-ray irradiation apparatus for calibration of radiation measuring equipment, characterized in that the motor means is driven in the forward direction by the calculated value of the rotation axis potential of the motor means and the motor means is forward driving step to return to the flow check step of the rail moving cart. It can be achieved by the method.

The control method of the calibration gamma-ray irradiation apparatus of the radiation measuring apparatus according to the present invention efficiently controls the operation of the calibration gamma-ray irradiation apparatus of the radiation measuring equipment to adjust the gamma-ray irradiation width on the calibration support according to the distance between the collimator and the calibration support. By displaying in real time, it has the effect of remarkably improving the accuracy and productivity of the calibration work for radiation measuring equipment.

1a to 1c is an installation state showing the configuration of the gamma-ray irradiation apparatus for calibration of the radiation measuring equipment whose operation is controlled by the control method of the calibration gamma-ray irradiation apparatus of the radiation measuring equipment according to the present invention,
Figure 2 illustrates the mutual organic relationship between the components electrically connected to the control unit of the calibration gamma-ray irradiation apparatus of the radiation measurement equipment controlled by the operation method of the calibration gamma-ray irradiation apparatus of the radiation measurement equipment according to the present invention One block,
3A and 3B are flowcharts illustrating a control method of a gamma-ray irradiation apparatus for calibration of a radiation measuring apparatus according to the present invention;
Figure 4 is an extension line and extension line extending in a straight line to the front of the collimator with a tanθ value calculated based on the angle of the collimator in the control method of the calibration gamma-ray irradiation apparatus of the radiation measuring apparatus according to the present invention Is a figure for explaining the calculation method of the distance between arbitrary points in the orthogonal direction of gamma ray irradiation width.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the control method of the gamma-ray irradiation apparatus for calibration of the radiation measuring equipment according to the present invention will be described in detail.

1A to 2, a gamma-ray irradiation apparatus 10 for calibrating a radiation measuring apparatus developed by the present applicant is equipped with a collimator 12 at a front side thereof, and a shielding body having a gamma ray source 13 embedded therein ( 11) a rail support 14 which is fixed on the front surface of the lead shield 11 with a rail 14a and a distance indication on an upper surface thereof, and mounted on a rail 14a of the rail support 14; And a rail moving trolley 15 moving along the rail 14a, and a plate, horizontally installed on the upper side of the rail moving trolley 15, and having a calibration base 16 for arranging the radiographic measuring object on the upper surface thereof. And a gamma ray irradiation device for calibrating a conventional radiation measuring device, comprising a height adjusting device 17 installed between the rail moving cart 15 and the calibration stand 16 to adjust the height of the calibration stand 16. Laser range finder 21, distance measuring laser reflector 22, gamma ray A laser irradiation apparatus 30 for displaying a radiation width, a gamma ray irradiation width display 23, a flow sensing means 25, a control unit 24 and an input means 26; The gamma ray irradiation width display laser irradiation device 30 is mounted to the rear end of the upper surface of the rail moving trolley 15 to indicate a laser indicating the irradiation width of the gamma ray irradiated through the collimator 12 of the lead shielding body (11) Irradiated upward according to the gamma ray irradiation width, the base 31, the shaft support block pairs 32 and 32 ', the rotary drive shaft 33, the two guide rods 34 and 34', It is composed of a pair of transport blocks 35 and 35 ', a motor means 36 and two laser units 37 and 37'.

3A and 3B, the control method of the gamma-ray irradiation apparatus for calibrating the radiation measuring apparatus according to the present invention includes a collimator irradiation angle input step S100, a tan θ value calculation step S110, and a rail moving cart moving step. (S120), the position checking step (S130) of the rail moving cart 15, the distance measuring step (S140), the gamma ray irradiation width calculation step (S150), the rotation axis potential value calculation step (S160), gamma ray irradiation Width display step (S170), rail moving trolley flow checking step (S180), distance measuring step (S190), distance value comparison step (S200), distance value checking step (S210), gamma radiation width and rotation axis The electric potential value calculating step (S220), the motor means reverse driving step (S230), the gamma ray irradiation width and rotation axis potential value calculating step (S240), and the motor means forward driving step (S250).

In the collimator irradiation angle input step (S100), the radiation angle of the collimator 12 mounted on the lead shield 11 is input. For reference, the collimator 12 is for irradiating a predetermined angle to the gamma ray radiated from the gamma ray source 13 in a predetermined direction, and the radiation hole penetrated at the center has a rear end portion on the opposite side of the gamma ray source 13 side. It is intended to have a conical inner circumferential surface having a smaller diameter, and gamma rays irradiated through these irradiation holes have a conical irradiation area, and the collimator 12 is manufactured to have irradiation holes of various angles. .

In addition, the input of the angle of the collimator 12 is input through the input means 26, in which the input value inputs a half value of the irradiation hole angle of the collimator 12 mounted. That is, the angle of the irradiation hole is 30 °, and 15 °, which is 1/2, is input.

The tan θ value calculating step (S110) calculates tan θ based on the angle value of the collimator 12.

The rail moving cart moving step (S120) moves the rail moving cart 15 to a calibration position. The rail moving trolley 15 is moved to various positions in order to calibrate the radiation measuring equipment with the radiation intensity of various areas such as high level, medium level and low level according to the distance from the source even using a single source.

The positioning step (S130) of the rail moving cart checks whether the position of the rail moving cart 15 is confirmed, and returns to the rail moving cart moving step (S120) when the position is not determined.

The distance measuring step S140 measures the distance between the rail moving cart 15 and the collimator 12 when the position of the rail moving cart 15 is determined.

The gamma irradiation width calculation step (S150) is a formula (distance measurement value x tanθ) that multiplies the distance measurement value by the calculated tanθ value (ie, a direction perpendicular to the gamma ray irradiation width (ie, in front of the collimator 12 in a straight line). Calculate the distance to any point of).

Referring to FIG. 4, the gamma ray radiated from the gamma ray source 13 is irradiated into an isosceles triangle shape (when viewed only in plan view) through the radiation hole 12a of the collimator 12, so that the rear end portion of the radiation hole 12a is irradiated. The vertex A of the isosceles triangle is called A, the left side (based on the drawing) is a, the right side (based on the drawing) is b, and the bottom side at which the rear end of the calibration base 16 on which the radiographic measuring object is to be calibrated is formed at c and A. When the length f extending vertically to the base c, the point D where the base c fits the height f, and the two oblique points B and C are assumed, the angle of the irradiation hole 12a is 30 ° and the length is 100 cm, △ ABC has a ∠A of 30 ° and ΔAD's ∠A is a 15 ° line segment DC with a length of 100 cm x tan15 = 26.79 ≒ 27 cm.

The rotating shaft potential value calculating step (S160) calculates the rotating shaft potential value of the motor means 36 of the gamma-ray irradiation width display laser styling device 30 corresponding to the calculated gamma-ray irradiation width. That is, if the gamma ray irradiation width is 27cm, the drive gear portion is mounted on the diameter of the drive gear portion 33a of the rotation drive shaft 33 of the gamma ray irradiation width display laser irradiation apparatus 30 and the rotation shaft of the motor means 36. Mutual organic relationship between the diameter and ratio of the drive gear 36a meshing with 33a, the diameter of the first and second threaded portions 33b and 33c of the rotary drive shaft 33, and the pitch of the thread formed on the outer circumferential surface thereof. And a calculation method of the rotation shaft potential of the motor means 36 is determined according to the ratio.

In the gamma ray exposure width displaying step S170, the motor means 36 is driven by the calculated rotation axis potential value to display the gamma ray irradiation width on the gamma ray irradiation width display 23. That is, when the potential value of the motor means 36 is calculated, the controller 24 drives the motor means 36 of the laser irradiation device 30 for displaying the gamma ray irradiation width by the calculated potential value to rotate in synchronization with it. As the drive shaft 33 rotates and the transfer block pairs 35 and 35 'assembled with the rotary drive shaft 33 are moved to face each other along the guide rods 34 and 34', the transfer block pair 35 A laser for gamma radiation exposure width, which is irradiated vertically from the laser units 37 (37 ') assembled to the laser unit assembly portions 35c and 36c' of the laser beam 35 ', is applied to the gamma ray irradiation width display 23. When the lower surface is irradiated and the motor means 36 is stopped, the transfer block pairs 35 and 35 'are also stopped, and thus the irradiation point of the gamma ray irradiation width display laser is stopped. On the upper surface of the gamma ray irradiation width display 23 to be irradiated, a laser irradiation point is indicated by a red dot, Since the area between the red dots is the gamma-ray irradiation area, the calibration worker easily arranges the calibration target radiation measuring equipment on the calibration pedestal 16 in the area between the red dots shown on the gamma-ray irradiation width display 23. It can be done.

The rail moving trolley flow checking step (S180) checks whether there is a flow of the rail moving trolley 15, and if there is no flow, maintains the gamma ray irradiation width displaying step (S170).

The distance measuring step S190 measures the distance between the collimator 12 and the rail moving cart 15 when there is a flow of the rail moving cart 15.

The distance measurement value comparison step S200 compares the distance measurement value measured in the distance measurement step S190 with the distance measurement value measured in the distance measurement step S140. The reason for comparing the distance measurement value of the distance measurement step S140 and the distance measurement value of the distance measurement step S190 is to determine the forward or reverse driving of the motor means 36.

The distance measurement value checking step S210 determines whether the distance measurement value measured in the distance measurement step S190 is smaller or larger than the distance measurement value measured in the distance measurement step S140.

The gamma radiation range and the rotation axis potential value calculation step (S220) is a distance measured value measured in the distance measurement step (S190) in the distance measurement value check step (S210) is the distance measured in the distance measurement step (S140) When smaller than the measured value, the gamma ray irradiation width and the rotation axis potential value of the motor means 36 are calculated.

The motor means reverse driving step (S230) drives the motor means 36 in the reverse direction as much as the calculated value of the rotation axis potential of the motor means 36, and returns to the rail moving cart flow checking step (S180).

The gamma radiation range and rotation axis potential value calculation step (S240) is the distance measured value measured in the distance measurement step (S190) in the distance measurement value check step (S210) is the distance measured in the distance measurement step (S140) When it is confirmed that it is larger than the measured value, the gamma ray irradiation width and the rotation axis potential value of the motor means 36 are calculated.

The motor means forward driving step (S250) drives the motor means 36 in the forward direction by the calculated value of the rotation axis potential of the motor means 36, and returns to the rail moving cart flow checking step (S180).

10: gamma irradiation device for calibration of radiation measuring equipment
11: Lead shield 12: collimator
13: Gamma Sailor 14: Rail Supports
15: Rail moving cart 16: Calibration stand
17: height adjusting device 21: laser range finder
22: Distance measuring laser reflector 23: Gamma radiation display width display
24: control unit 25: flow detection means
26: input means
30: laser irradiation device for displaying gamma ray irradiation width

Claims (1)

A lead shielding body in which a collimator is mounted on the front surface, and a gamma source is embedded therein; A rail support; A rail moving trolley mounted on the rail of the rail support and moving; A calibration support horizontally installed above the rail moving trolley; A height adjusting device for adjusting the height of the calibration pedestal; A laser range finder for measuring a distance between the collimator and the rail moving cart; A distance measuring laser reflector reflecting a distance measuring laser emitted from the laser range finder; A gamma-ray irradiation width display laser irradiation device for irradiating a laser indicating an irradiation width of gamma rays irradiated through a collimator of a lead shielding body upwardly according to the gamma-ray irradiation width; A gamma ray irradiation width display for receiving a gamma ray irradiation width display laser emitted from the gamma ray irradiation width display laser irradiation apparatus on a lower surface thereof and displaying the gamma ray irradiation width display laser on an upper surface thereof; A flow sensing means mounted on the rail moving trolley to sense the movement of the rail moving trolley; It is electrically connected to the laser range finder, the gamma ray irradiation width display laser irradiation device and the flow sensing means, respectively, and calculates the gamma ray irradiation width according to the distance value and the angle value of the collimator, and the interval of the gamma ray display laser according to the result value. A control unit controlling the; In the gamma irradiation device for calibration of radiation measuring equipment consisting of an input means for being electrically connected to the control unit for inputting the angle value of the collimator,
The control method of the irradiation device,
A collimator irradiation angle input step (S100) of inputting a radiation angle of the collimator 12 mounted on the lead shielding body;
A tan θ value calculating step (S110) for calculating tan θ based on the irradiation angle of the collimator 12 at half the irradiation angle of the collimator 12;
A rail moving trolley moving step (S120) for moving the rail moving trolley (15) to a calibration position;
Confirming the position of the rail moving cart 15 and confirming the position of the rail moving cart 15 when the position is not determined and returning to the rail moving cart moving step S120;
A distance measuring step (S140) of measuring a distance between the rail moving cart (15) and the collimator (12) when the position of the rail moving cart (15) is determined;
Calculate the gamma-ray irradiation width (ie, the length from the straight line to the arbitrary point in the perpendicular direction in front of the collimator 12) by a formula (distance measurement value x tan θ) that multiplies the distance measurement value by the calculated tan θ value. A gamma ray irradiation width calculating step (S150);
A rotating shaft potential value calculating step (S160) of calculating a rotating shaft potential value of the motor means 36 of the gamma ray irradiation width display laser irradiation apparatus 30 corresponding to the calculated gamma ray irradiation width;
A gamma ray irradiation width display step (S170) of driving the motor means 36 by the calculated rotation axis potential value to display a gamma ray irradiation width on a gamma ray irradiation width display 23;
Checking whether there is a flow of the rail moving cart 15, and if there is no flow, checking the gamma ray irradiation width displaying step S170;
A distance measuring step S190 of measuring a distance between the collimator 12 and the rail moving trolley 15 when there is a flow of the rail moving trolley 15;
A distance measurement value comparison step (S200) for comparing the distance measurement value measured in the distance measurement step (S190) and the distance measurement value measured in the distance measurement step (S140);
A distance measurement value checking step S210 for checking whether the distance measurement value measured in the distance measurement step S190 is smaller or larger than the distance measurement value measured in the distance measurement step S140;
If it is confirmed in the distance measurement value confirming step S210 that the distance measurement value of the distance measurement step S190 is smaller than the distance measurement value of the distance measurement step S140, the gamma ray irradiation width and the rotation axis of the motor means 36 are determined. A gamma ray irradiation width and a rotating shaft potential value calculating step (S220) for calculating a potential value;
A motor means reverse driving step (S230) of driving the motor means (36) in the reverse direction by the calculated rotation axis potential value of the motor means (36) and then returning to the rail moving cart flow checking step (S180);
If it is confirmed in the distance measurement value checking step (S210) that the distance measurement value of the distance measurement step (S190) is larger than the distance measurement value of the distance measurement step (S140), the gamma ray irradiation width and the rotation axis of the motor means (36) A gamma ray irradiation width and a rotating shaft potential value calculating step (S240) for calculating a potential value;
The motor means forward driving step (S250) for driving the motor means 36 in the forward direction as much as the calculated value of the rotation axis potential of the motor means 36 and then return to the rail moving cart flow check step (S180). Control method of gamma irradiation device for calibration of radiation measuring equipment.

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