KR20180132399A - Apparatus for detecting radioactive contamination of food and method of the same - Google Patents

Abstract

The present invention relates to a system and a method for automated radioactive contamination inspection for continuous inspection of radioactive food contamination. The radioactive contamination inspection system includes a conveyor (3) supplying and discharging an inspection target (S); a shielding portion (5) preventing outward radiation release during radiation measurement with respect to the inspection target (S) conveyed by the conveyor (3); a distance measuring device (24) disposed inside the shielding portion (5) to measure the height and the size of the inspection target (S); side radiation measurement units (14,16) disposed on both inner sides of the shielding portion (5) so as to be movable back and forth and performing primary radioactive inspection on the inspection target and performing measurement at a distance calculated by means of data measured by the distance measuring device (24); an upper radiation measurement unit (7) disposed in the inner upper portion of the shielding portion (5) so as to be movable up and down and performing secondary radioactive inspection on the inspection target (S); a radiation analyzer (9) analyzing the radioactivity measured by the upper and side radiation measurement units (7,14,16); and a control unit (11) sequentially performing radioactive inspection by means of control in conjunction with the conveyor, the shielding portion, distance measuring means, the upper and side radiation measurement units (14,16), and the radiation analyzer.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radioactive contamination detection system,

The present invention relates to a system and method for inspecting contaminated whole water, and more particularly, to a radioactive contaminated total water inspection system and method for inspecting radioactive contaminated water by dividing a radioactivity test into measurement accuracy and measurement efficiency by disposing a radioactivity meter on the top, The present invention relates to a technique capable of continuously measuring contamination of a sample, measuring radioactivity by a check inspection method, and reducing measurement time.

Since the Fukushima Nuclear Power Plant accident, radioactive contamination of processed foods, livestock products, aquatic products and agricultural products imported from Japan, and fishery products caught in the coastal waters off the coast of Korea has become a socially important issue.

According to the Korea Food and Drug Administration, from March 14, 2011 to January 9, 2014, after the accident at the Fukushima Nuclear Power Plant, we examined the current status of imported food radioactivity tests in Japan by examining more than 70,000 tests and more than 210,000 tons. Most of the foods detected radioactivity are marine products and processed foods.

Specifically, a small amount of radioactivity was detected in 131 out of the 12,000 aquatic products imported from Japan reported to have been imported into the country since the Fukushima nuclear power plant accident. Respectively.

As a result, the investigation of the Japanese government has become unreliable, and it is necessary to conduct a thorough examination.

However, the conventional radioactive inspection method has a problem of low reliability and inefficiency as a sample inspection, not a time delay and an overall inspection, due to the manual operation of the portable measurement section in the field or the measurement of some samples by the laboratory.

In particular, since a large-scale treatment capacity is expected in the whole water inspection of the test substance, it is necessary to conduct the radioactivity test for 24 hours continuously.

In addition, there is a problem that, in the radioactivity test, the radioactivity meter inspects the test object only once, thereby reducing the accuracy of the test.

Patent Application No. 10-2014-143091 (Name: Radiation monitoring system and monitoring method using the same)

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a radioactive- The present invention also provides a radioactive inspection system and an inspection method which can be continuously and automatically grasped and can be reduced in measurement time.

According to an aspect of the present invention,

A conveyor 3 for feeding and discharging the object S to be inspected;

A shielding part 5 for preventing radiation from being emitted to the outside during radiation measurement of the inspection object S conveyed by the conveyor 3;

A distance measuring device 24 disposed inside the shield 5 to measure the height and size of the object S;

The radiation shielding part 5 is provided on both inner sides of the shield 5 so as to be able to move forward and backward so that the radiation inspection of the object to be inspected is performed primarily, Measuring portions (14,16);

An upper radioactivity measuring unit 7 which is disposed on the inner upper portion of the shielding unit 5 so as to be ascendable and descendable and performs the radioactivity test on the object to be inspected S

A radiation analyzer (9) for analyzing the radioactivity measured by the upper and lower radiation meters (7, 14, 16); And

And a control unit (11) for performing a radioactivity test sequentially by controlling the conveyor, the shielding unit, the distance measuring unit, the upper and side radiation measuring units (14, 16) and the radiation analyzer do.

In the radioactive contamination inspection system and method according to the embodiment of the present invention, a radioactivity detector is disposed on the top and sides of the radioactive shielding unit, and the radioactivity is doubly inspected, thereby continuously and automatically detecting contamination of the sample , Measurement time can be reduced.

Further, there is an advantage that a radioactivity detector having an excellent measuring efficiency is disposed on the side surface, and a radioactivity detector having a high measurement accuracy is disposed on the upper side to perform a secondary measurement, thereby enabling rapid inspection even when the whole water inspection is performed .

The height, size, and weight of the object to be inspected are measured by the distance measuring machine and the weight measuring machine, and reflected in the radiation measurement, thereby improving the accuracy of the inspection.

1 is a perspective view showing a radiation inspection system according to an embodiment of the present invention.
FIG. 2 is a front view of FIG. 1 showing a state in which an upper radiation dose measurement module and a side radiation measurement module examine an object to be inspected supplied to the inside of the shield.
3 is a perspective view showing a measurement module of the side radiation measuring unit shown in FIG.
FIG. 4 is a perspective view showing the measurement module of the upper radiation measuring unit shown in FIG. 1. FIG.
5 is a block diagram showing the structure of the control unit shown in FIG.
FIG. 6 is a flowchart showing a method of performing radiation measurement by the radiation inspection system shown in FIG. 1. FIG.
FIG. 7 is a flowchart showing the radioactivity measurement method shown in FIG. 6 in more detail.

Hereinafter, a radiation inspection system and method according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 to 4, a radiation inspection system proposed by the present invention includes a conveyor 3 for supplying and discharging an object S to be inspected; A shielding part 5 for preventing radiation from being emitted to the outside during radiation measurement of the inspection object S conveyed by the conveyor 3; A distance measuring device 24 disposed inside the shield 5 to measure the height and size of the object S; The radiation shielding part 5 is provided on both inner sides of the shield 5 so as to be able to move forward and backward so that the radiation inspection of the object to be inspected is performed primarily, Measuring portions (14,16); An upper radioactivity measuring unit 7 which is disposed on the inner upper portion of the shielding unit 5 so as to be able to ascend and descend and conducts the radioactivity test on the object to be inspected S; A radiation analyzer (9) for analyzing the radioactivity measured by the upper and lower radiation meters (7, 14, 16); The radioactive inspection is performed sequentially by controlling the conveyor 3, the shielding unit 5, the distance measuring unit 24, the upper and side radiation measuring units 7, 14 and 16, and the radiation analyzer 9, (Not shown).

In the radiation inspection system having such a structure, the conveyor 3 means a conveyor of a conventional structure capable of conveying the object S to be inspected. That is, the conveyor 3 is disposed so as to pass through the lower portion of the shield 5.

Therefore, when the conveyor 3 is driven in a state where the inspection object S is placed on the conveyor 3, the inspection object S is supplied to the shielding portion 5 so that the radiation measurement is performed at least once, The inspection object S is discharged to the outside of the shielding portion 5 later.

The shielding unit 5 allows radiation inspection of the inspection object S supplied through the conveyor 3 to be performed in a radiation shielding state. The shielding portion 5 includes a wall 13 which is a radiation shielding member and shields all sides; And doors D1 and D2 that are openably and rearwardly disposed on the front and rear sides of the wall 13, respectively.

In the shielding portion 5 having such a structure, the wall 13 may be formed of a material capable of shielding the radiation. For example, it may be a lead material mainly used in the past, or may be formed of a material such as a nano foam or a ceramic. By arranging the wall 13 in all directions, a space for inspecting the inside of the wall 13 is formed, thereby preventing radiation from being released to the outside during the inspection.

The doors D1 and D2 are disposed in front of and behind the shield 5 so that the inspection object S can be supplied to or discharged from the inside of the shield 5. [

Of course, the doors D1 and D2 also function as a radiation shielding material, so that radiation emitted during inspection can be effectively prevented from being emitted to the outside.

The doors D1 and D2 are configured to be lifted and lowered by a motor and can be opened and closed by driving the motor by a signal from the control unit 11. [

The inside of the shielding portion 5 is provided with the side radioactivity measuring portions 14 and 16 for performing a primary radioactivity test and the upper radioactivity measuring portion 7 for performing a secondary radioactivity test, Radiographic examinations can be performed sequentially.

That is, as shown in FIG. 4, the upper radioactivity measuring unit 7 includes radioactivity measuring modules 7a, 7b and 7c disposed on the inner upper portion of the shielding unit 5, Three are arranged.

Since these radioactive measurement modules 7a, 7b and 7c have the same structure, they will be described by one radioactive measurement module 7a.

The radiation measurement module 7a includes a first upper radiation meter 15a for inspecting the radiation emitted from the object S to be inspected; And a lift portion 19 for moving up and down the first upper radioactivity meter 15a.

In this radiation measurement module, the first upper radiation meter 15a means a detector having a high measurement accuracy, and includes, for example, a NaI (Tl) meter, a lanthanum bromide detector, and the like.

Since conventional HPGe instruments must supply LN2 gas, it is difficult to operate continuously for 24 hours and time delays occur because samples must be preprocessed.

Accordingly, in this embodiment, by using the NaI (Tl) meter 15a or the like, gas supply is unnecessary, a pre-process is not required, continuous operation is possible, inspection efficiency is high, and resolution is high.

The NaI (Tl) meter 15a is classified as an inorganic scintillator as a scintillation detector. Thallium-activated sodium iodide enables high efficiency gamma ray detection because it has a relatively high density and atomic number . This NaI (Tl) meter 15a has a peak emission spectrum at 410 nm and exhibits the highest light yield in all scintillators.

The radioactivity measuring modules 7a, 7b and 7c are constituted by a plurality of measuring instruments 15a, 15b and 15c and a plurality of measuring instruments 15a, 15b and 15c sequentially inspect the objects S to be inspected, This is possible.

For example, when three instruments 15a, 15b and 15c, that is, first to third upper measuring instruments, are arranged, the inspected object S is conveyed by the conveyor 3 to the inside of the shielding part 5 The first inspected object S is conveyed to the position of the first upper measuring instrument 15a. The second inspection object S is transported to the position of the second upper measuring instrument 15b and the third inspection object S is transported to the third upper measuring instrument 15c.

Since the inspection objects S are transported to the positions of the first to third upper meters 15a, 15b and 15c, respectively, the radiation measurement can be simultaneously performed for the respective inspection objects, and the inspection time can be shortened have.

Of course, each of the meters 15a, 15b, and 15c may measure not only the objects S to be inspected on a one-to-one basis, but also selectively.

For example, the third upper measuring instrument 15c temporarily checks whether or not the object to be inspected is contaminated, and the first upper measuring instrument 15a is required to perform a precise inspection of the inspected object S temporarily inspected In this case, a close inspection is carried out.

As described above, the control unit 11 can perform the inspection at the same time or selectively perform the measurement by suitably controlling the inspection procedures of the first to third upper meters 15a, 15b and 15c.

On the other hand, the NaI (Tl) meter 15a can be vertically moved up and down by the elevator 19. The elevating unit 19 refers to an elevating unit that elevates and lowers the measuring instrument 15, and may include various elevating equipment.

For example, the elevating portion 19 can be fixed to a frame F arranged inside the shielding portion 5 as a cylinder type or a motor type so that the measuring device 15 can be moved up and down. In the case of the cylinder system, the piston (22) is mounted on the cylinder (20) such that it can move back and forth by hydraulic pressure or air pressure. The upper portion of the cylinder 20 is fixed to the frame F and the measuring instrument 15 is fixed to the tip of the piston 22. [

Therefore, when the cylinder 20 is operated by the signal of the control unit 11, the piston 22 is lowered down and the meter 15 is also lowered. On the other hand, when the piston 22 is raised, Rise.

In this way, the elevating portion 19 can move the measuring instrument 15 up and down within the shielding portion 5.

Of course, in the case of the motor system, the motor shaft is moved up and down by the motor according to the signal of the control unit 11, and the meter 15 can also ascend and descend.

In addition, a distance measuring instrument 24 may be additionally provided for the meter 15 to descend to the correct position.

The distance measuring device 24 measures the distance and size between the distance measuring device 24 and the inspected object S transferred to the inside of the shielding part 5 and interlocks with the measuring device 15 so that the measuring device 15 descends to an appropriate height, To be measured.

The distance measuring instrument 24 includes various distance measuring instruments, for example, an infrared measuring sensor or a laser measuring sensor.

The distance measuring instrument 24 irradiates the surface of the object S to be inspected with an infrared ray or a laser by the signal of the control section 11 when the object S is conveyed to the inside of the shielding section 5 by the conveyor 3 Thereby measuring the distance from the object S to be inspected. At this time, the size of the object S to be inspected can be measured by continuously measuring the distance while moving the distance measuring instrument 24 in the X-axis direction.

When the numerical signal measured by the distance measuring instrument 24 is transmitted to the control section 11 as described above, the control section 11 transmits a signal to the ascending and descending section of the measuring instrument 15 according to the measured distance, .

At this time, the descending height of the measuring instrument 15 is set in advance in the control unit 11. [ That is, the height suitable for detecting the radiation is input in advance in consideration of the thickness, the size, and the like of the object S to be inspected. Accordingly, when the value measured by the distance measuring unit 24 is transmitted to the control unit 11, the control unit 11 calculates the height from the database 44 according to the value and transmits it to the elevating unit 19. [

The elevator 19 can move the measuring instrument 15 to the appropriate height by raising and lowering the measuring instrument 15 by this signal.

The present invention is not limited to this, and may be applied to the control unit 11 (11a, 12b, 12c) interlocked with the side radioactivity meters 17a, 17b, 17c and the distance measuring unit 24 is interlocked with the upper radioactivity meters 15a, 15b, As shown in FIG.

On the other hand, the side radioactivity measuring units 14 and 16 are disposed inside the both side surfaces of the shielding unit 5, respectively, so that the radioactivity measurement on the object to be inspected can be performed primarily.

That is, when the object to be inspected enters the inside of the shield 5, the radioactivity is firstly inspected by the side radioactivity measuring units 14 and 16, and if it is within the normal range, it is discharged. If the object is out of the normal range, 7) to conduct the radioactivity test again.

The side radioactivity measuring units 14 and 16 include side radioactivity measuring modules 30a, 30b and 30c disposed on both inner sides of the shield 5 as shown in FIG. , For example, three are arranged.

The side radioactivity measuring modules 30a, 30b and 30c include side measuring instruments 17a, 17b and 17c, respectively, and a plurality of side measuring instruments 17a, 17b and 17c sequentially inspect the objects to be inspected S Radiation measurement is possible.

For example, when three side measuring instruments 17a, 17b and 17c, that is, first to third side measuring instruments, are disposed, the inspected object S is conveyed by the conveyor 3, The first inspected object S is conveyed to the position of the first side instrument 17a. Then, the second inspection object S is transported to the position of the second side instrument 17b, and the third inspection object S is transported to the third side instrument 17c.

Since the inspection objects S are transported to the positions of the first to third side meters 17a, 17b and 17c, respectively, the radiation measurement can be simultaneously performed on the respective inspection objects, and the inspection time can be shortened have.

The first to third side radioactivity measuring modules 30a, 30b and 30c are described by the first side measuring module 30a having the same structure.

The first side measurement module 30a includes a first side radiation meter 17a for inspecting the radiation emitted from the object S to be inspected; And a front and rear portion 18a for moving the first side radioactivity meter 17a back and forth.

In this radiation measurement module, the first side radiation meter 17a means a detector having a good measurement efficiency, and includes, for example, a plastic detector, a flash detector and the like. Of course, a NaI (Tl) meter may be included.

The first side radioactivity meter 17a can be moved back and forth in the inward direction by the forward / backward portion 18a. The front and rear part 18a can be arranged on the inner wall of the shield 5 as a cylinder type or a motor type so as to move the first side radioactivity meter 17a back and forth.

The forward / backward portion 18a has the same structure as that of the lifting / lowering portion 19, and a detailed description thereof will be omitted.

Therefore, when the cylinder 20 is operated by the signal of the control unit 11, the piston 22 advances to advance the first side radioactivity meter 17a. On the contrary, when the piston 22 moves backward, The meter 17a is also reversed.

In this way, the forward / backward part 18a can move the first side radioactivity meter 17a back and forth within the shield 5.

Of course, in the case of the motor system, the motor shaft is driven by the motor according to the signal of the control unit 11, so that the meter 15 can also be moved back and forth.

The side radioactivity measurement modules 7a, 7b, 7c may transmit signals to the control unit in cooperation with the distance measuring instrument.

On the other hand, the weight of the object S to be inspected can be measured by disposing the weight sensor 26 on the shield 5. The weight sensor 26 may include various types of sensors, for example, a load cell.

The weight sensor 26 can be placed on the inner bottom of the shield 5 or on the conveyor 3 to measure the weight of the object S to be inspected.

Then, the measured weight value is transmitted to the control unit 11, and the control unit 11 reflects the converted radiation measurement unit.

The radiation analyzer 9 receives the radiation measurement signal transmitted from the measurement unit 7, analyzes the radiation intensity, and transmits the radiation intensity to the control unit 11. The radioactivity analyzer 9 means various types of analyzers, for example, a multi-peak analyzer 9.

The multi-peaking analyzer 9 is a device for measuring the energy spectrum of radiation. The multi-peaking analyzer 9 measures a plurality of output signals of various heights according to the energy of the radiation coming from the radiation meter 15, Can be measured at the same time.

The control unit 11 determines whether the object to be inspected is contaminated or not based on the radiation intensity value received from the radiation analyzer 9,

The control unit 11 includes a conveyor 3, an upper radiation measuring unit 7, a side radiation measuring unit 14, a shielding unit 5 and input / output modules 32, 34); A distance measuring and meter moving module 36; A radiation measurement module 38; A conveyor transfer module 40; A process module (42) for conducting an inspection process in cooperation with each module; And a database 44.

The distance measuring and measuring instrument moving module 36 calculates the distance to the inspection object S by interlocking with an infrared sensor or a laser sensor which is a distance measuring instrument and drives the motor by transmitting a signal to the elevating portion 19, So that it can ascend and descend to a predetermined position.

Since the height of the meter 15 according to each distance is stored in the database 44 in advance, the distance measurement and meter moving module 36 fetches the corresponding value and transmits it to the elevator 19 to drive the motor, (15).

Then, the radiation measurement module 38 controls the measurement process such as the start, the progress, and the completion of measurement by transmitting a signal to the meter 15. Further, the radiation measuring module 38 converts the measured and transmitted data, that is, the radiation dose (Roentgen) into the radiation intensity (Bq / kg).

The conveyor transfer module 40 interlocks with the conveyor 3 to supply the inspection object S to the shielding part 5 or discharge it from the shielding part 5 according to a predetermined inspection schedule.

Then, the process module 42 controls processes throughout the radiation examination. That is, when the object S to be inspected is placed on the conveyor 3, a signal is transmitted to the conveyor transfer module 40 to drive the conveyor 3 to transfer the object S to the shielding part 5.

When the object S reaches the inside of the shield 5, a distance measurement and a signal are transmitted to the meter moving module 36 so that distance measurement and radiation measurement can be performed.

Then, a signal is transmitted to the radiation measurement module 38 so that the radiation measurement can be performed. When the radiation measurement is completed, the radiation intensity is calculated through the radiation analyzer 9.

When the radiation measurement process is completed, a signal is transmitted to the conveyor transfer module 40 to drive the conveyor 3 to discharge the inspection object S to the outside of the shielding part 5. [

On the other hand, if it is determined that the contaminant is a result of inspection, the process module 42 transmits a signal to the alarm unit to inform that the contaminant is contaminant. Such alarms can guide the pollution in various ways, for example, beeping a warning sound, blinking an emergency lamp, or displaying radiation intensity at the same time through a display. have.

Hereinafter, a method of inspecting radioactive contaminated food according to an embodiment of the present invention will be described in detail.

6 and 7, the method for inspecting radioactive contaminated food according to the present invention includes the steps of: (a) transferring a target S to a shielding unit 5; (b) measuring (S110) the size and the vertical distance of the inspected object S transferred; (c) a step (S120) of measuring radiation of the object to be inspected S primarily by the side radiation measuring units 14 and 16; (d) a step (S130) of judging whether or not the control unit 11 is contaminated by the measured radiation data; (e) secondarily measuring the radioactivity of the object to be inspected S by the upper radioactivity measuring module 7 (S140); (f) discharging the control unit 11 to the outside of the shielding unit 5 when it is determined that the control unit 11 is normal (S150).

In this inspection method, the inspection object S is placed on the conveyor 3 in step (a) (S100), and the conveyor 3 is driven by the signal of the control part 11 (step S10). That is, the controller 11 transmits a signal to the distance measuring and meter moving module 36 to drive the motor of the conveyor 3 so that the conveyor 3 is transferred toward the shield 5 (S15).

As described above, the conveyor 3 advances in the direction of the shielding portion 5, so that a plurality of objects S to be placed on the conveyor 3 can be transferred to the shielding portion 5.

At this time, since the number of the objects S to be inspected is plural, for example, three, the first inspected object S reaches the position of the first side radioactivity measuring module 30a and the second inspected object S reaches the second side Reaches the radiation measurement module 30b, and the third inspection object S transports the conveyor 3 to reach the third side radiation measurement module 30c.

When the conveying step S100 of the inspected object S is completed, a step S110 of measuring the distance and the size with respect to the inspected object S proceeds.

In this step, the controller 11 drives the distance measuring instrument 24 by transmitting a signal to the distance measuring and measuring instrument moving module 36. When the distance measuring instrument 24 is driven, the distance measuring instrument 24 measures the height of the object S by irradiating the surface of the object S with infrared rays or a laser (S20).

The distance measuring device 24 continuously measures the height of the object S while moving in the conveying direction of the conveyor 3 so that the size of the object S can be finally measured.

When the distance measuring unit 24 measures the size and height of the object S (S110), the radiation measuring step S120 proceeds.

That is, in the radiation measurement step (S120), the measured height and size data are transmitted to the control unit (11). The control unit 11 calculates the forward distance of the side radiation measuring units 14 and 16 by calculating the input data (S30).

At this time, since there are a plurality of side activity measuring modules 30a, 30b and 30c, an appropriate distance is calculated according to each of the corresponding objects S to be inspected.

After calculating the advance distance, the control unit 11 advances by driving the motors of the first to third side radiation measurement modules 30a, 30b, and 30c by transmitting a signal to the radiation measurement module. And the first to third side radiation measurement modules 14 and 16) reach the target position.

In this state, the side radioactivity measuring units 14 and 16 measure the radiation generated from the object S to be inspected.

At this time, the first side radioactivity meter 17a to the third side radioactivity meter 17c simultaneously measure the radiation for each inspected object S (S40). Therefore, the radiation measurement time for the object S to be inspected can be shortened.

Since the measured radiation value is Roentgen, the radiation measuring module 38 converts the measured radiation intensity into a radiation intensity (Bq / kg) by the radiation analyzer 9.

When the radiation measurement step S120 is completed in this manner, the step of determining whether the object S to be inspected is contaminated is performed (S130).

That is, the control unit 11 determines whether the object S is contaminated by comparing the intensity of radiation input from the radiation measurement module 38 with a previously input reference value (S50).

For example, in the case of I-131, the intensity of the radiation is compared with a reference value (Bq / kg) of 100 or more, and in the case of Cs-134 and Cs-137, 50 or 100 or more.

When the step of determining whether the radiation intensity is at the contamination level (S130) is completed, (e) the step (S140) is performed.

That is, if it is determined that the radiation intensity is equal to or greater than the reference value, the control unit 11 further performs the inspection by the upper radiation measurement modules 7a, 7b, and 7c (S53).

That is, the control unit 11 measures the radiation generated from the object S by transmitting a signal to the upper radiation measuring unit 7. [

At this time, when there are a plurality of radiation measuring units 7, the radiation measuring unit 7 calculates an appropriate height according to each of the corresponding objects S to be inspected.

After calculating the descent height, the control unit 11 moves the motor of the radiation measuring unit 7 to descend by transmitting a signal to the radiation measuring module 38. When the radiation measuring unit 7 reaches the target height, it is stopped.

In this state, the radiation measuring section 7 measures the radiation generated from the object S to be inspected.

At this time, the first to third measuring instruments 15a to 15c simultaneously measure the radiation for each inspected object S (S40). Therefore, the radiation measurement time for the object S to be inspected can be shortened.

In this manner, the radiation measurement to the object S to be inspected is additionally performed, so that measurement can be performed more accurately and stably.

Since the measured radiation value is Roentgen, it is converted into the radiation intensity (Bq / kg) by the radiation analyzer 9.

When the inspection by the upper radioactivity measurement modules 7a, 7b, 7c is completed and it is determined that it is normal, the control unit 11 opens the door of the shielding unit and discharges the door to the outside.

Conversely, if it is determined that the inspection result is contaminated, the control unit 11 transmits a signal to the alarm unit to generate a warning sound (S52).

Through this process, the radiation measurement for the object S to be inspected can be performed in duplicate.

Claims (6)

A conveyor 3 for feeding and discharging the object S to be inspected;
A shielding part 5 for preventing radiation from being emitted to the outside during radiation measurement of the inspection object S conveyed by the conveyor 3;
A distance measuring device 24 disposed inside the shield 5 to measure the height and size of the object S;
The radiation shielding part 5 is provided on both inner sides of the shield 5 so as to be able to move forward and backward so that the radiation inspection of the object to be inspected is performed primarily, Measuring portions (14,16);
An upper radioactivity measuring unit 7 which is disposed on the inner upper portion of the shielding unit 5 so as to be able to ascend and descend and conducts the radioactivity test on the object to be inspected secondarily;
A radiation analyzer (9) for analyzing the radioactivity measured by the upper and lower radiation meters (7, 14, 16); And
And a control unit (11) for sequentially performing a radioactivity test by controlling the conveyor, the shielding unit, the distance measuring unit, the upper and side radiation measuring units (14, 16), and the radiation analyzer. The method according to claim 1,
The upper radioactivity measuring unit 7 includes radioactivity measuring modules 7a, 7b and 7c disposed on the inner upper portion of the shielding unit 5 and the radioactivity measuring modules 7a, 7b and 7c emit A first upper radiation gauge 15a for examining the radiation being emitted; And the elevation part (19) for raising and lowering the first upper radioactivity meter (15a), so that a plurality of inspection objects can be simultaneously inspected. The method according to claim 1,
The side radioactivity measuring units 14 and 16 include side radioactivity measuring modules 30a, 30b and 30c disposed on both inner sides of the shielding unit 5,
The side radioactivity measuring modules 30a, 30b and 30c include a first side radioactivity meter 17a for inspecting the radiation emitted from the inspected object S; And the forward and backward portions (18a) for causing the first side radioactivity meter (17a) to move back and forth, whereby a plurality of objects to be inspected can be simultaneously inspected. The method according to claim 1,
The control unit includes a conveyor, an upper radiation measurement unit, side radiation measurement units (14, 16), a shielding unit, an input / output module for inputting and outputting data from the radiation analyzer; A distance measuring and meter moving module; A radiation measurement module; A conveyor transfer module; A processor module for performing an inspection process in cooperation with each module; A radiation inspection system comprising a database. The method according to claim 1,
And a weight measuring sensor for measuring the weight of the object to be inspected and transmitting the measured weight to the control unit. (a) transferring the inspection object S to the shielding portion 5 (S100);
(b) measuring (S110) the size and the vertical distance of the inspected object S transferred;
(c) a step (S120) of measuring radiation of the object to be inspected S primarily by the side radiation measuring units 14 and 16;
(d) a step (S130) of judging whether or not the control unit 11 is contaminated by the measured radiation data;
(e) secondarily measuring the radioactivity of the object to be inspected S by the upper radioactivity measuring unit 7 (S140); And
(f) a step (S150) of discharging the control unit (11) to the outside of the shielding unit (5) when it is determined that the control unit (11) is normal.

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