KR101997409B1 - Experimental apparatus for radiation shield and the method thereof - Google Patents

Abstract

Provided are a radiation shield performance measurement apparatus and a measurement method using the same, which can accurately measure radiation transmission strength in real time in an allowable error range by variably changing a radiation irradiating position of a corresponding area of an object to be tested and a radiation source.

Description

TECHNICAL FIELD [0001] The present invention relates to a radiation shielding performance measuring apparatus and a measuring method using the radiation shielding performance measuring apparatus.

The present invention relates to a radiation shielding performance measuring apparatus and a measuring method using the same, and more particularly, to a radiation shielding performance measuring apparatus and a measuring method using the radiation shielding performance measuring apparatus. And a measurement method using the same.

Radiation refers to α-rays, β-rays, and γ-rays emitted by the collapse of radionuclides (nuclear species), but includes particle beams or electromagnetic waves (electromagnetic waves) generated by various reactions involving nuclei in a broad sense . Of these, α and β are particle beams directly related to the collapse of the nucleus due to radioactive decay. The main body of α ray is the nucleus of helium, and the main body of β ray is electron (electron).

On the other hand, the? -Ray is an electromagnetic wave having a short wavelength. Properties common to radiation include ionizing action, photographic action and fluorescence action. Radiation causes the material to ionize and lose its energy by its action with the substance.

On the other hand, the radiation shielding performance test is mainly performed at nuclear facilities, and it is used for the nuclear fuel handling facilities of nuclear power plants, X-ray imaging facilities at hospitals, shielding facilities such as radioisotope use facilities, This is a test to confirm that radiation can be safely performed.

In the inspection procedure, if the actual radiation source or radioactive material is placed inside the shield, or if it is impossible to inspect using the actual source or radioactive material, the radioactive isotope having such properties is placed in the shield, The amount of leakage radiation from the outside of the shielding body is measured by a radiation meter, a surveying instrument or the like, and the measurement of the radiation dose is recorded to confirm the expected performance of the shielding material.

Prior art relating to a radiation shielding measuring apparatus for measuring the shielding performance of a radiation shielding material is a technique of simply testing the shielding ability of the material under test using a general radiation measuring apparatus without using a radiation generating apparatus Japanese Patent Application Laid-Open No. 2015-227868 for a container and a plate used for the radiation shielding capability test method, a portable radiation measuring device which can easily check the operation state of the measuring instrument by incorporating a small amount of reference source, There is a Korean Registered Utility Model No. 20-0344802 on a radiation shielding apparatus capable of testing the radiation transmittance according to the type and thickness of the shielding plate and the attenuation according to the distance between the radiation source and the Geiger counter tube using a measuring instrument .

However, in the case of a measurement object made of the material to be tested disclosed in the above Japanese Unexamined Patent Publication, the radiation body is housed in the interior thereof. Accordingly, the distance between the object to be measured and the radiation body, The reliability of the data is reduced, and the measurement data has a large error range.

Therefore, there is a need for a research and development of a radiation shielding measurement that enables a more accurate measurement of a region corresponding to a subject and a radiation source.

Korean Registered Utility Model No. 20-0344802 (Mar. 3, 2004) Japanese Laid-Open Patent Application No. 2015-227868 (Dec. 17, 2015)

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art and the technical problems required from the past.

The inventors of the present application have conducted intensive research and various experiments and, as will be described later, by varying the position of the corresponding region of the test subject and the radiation source, the radiation transmittance is accurately measured in real time in the tolerance range And to provide a measurement method using the same.

It is another object of the present invention to provide a radiation shielding performance measuring apparatus and a measuring method using the same that can perform more accurate measurement by additionally performing a specific resistance measurement for compensating a radiation shielding performance according to a condition of a test object .

According to an aspect of the present invention, there is provided an apparatus for measuring a radiation shielding performance, comprising: a body having a predetermined inner space;

A support member rotatably seated on a test subject provided in the inner space;

A radiation source which is movably mounted to irradiate a predetermined portion of the object to be examined with radiation; And

And a radiation detector formed at a corresponding portion of the radiation source and operated in conjunction with the radiation source.

Accordingly, the apparatus for measuring a radiation shielding performance according to the present invention is a device for measuring radiation shielding performance according to the present invention, in which a region to which a test subject and a radiation source correspond corresponds to each other as the test object for shielding radiation emitted from a radiation source rotates in the lateral direction, The transmission strength can be measured.

In one preferred embodiment of the present invention, the DUT is formed in a circular or elliptical shape, and the radiation source may be configured to be movable in the center direction of the DUT.

In one preferred embodiment of the present invention, the support member includes: a loading portion that supports the surface of the object to be tested;

A rotating part provided so that the loading part is rotatable;

A mounter for supporting the rotating portion; And

And a lift unit provided to enable the rotation unit to move up and down.

Here, in one preferred example of the present invention, the radiation detecting portion is formed on the upper surface of the mounter, and may be formed at a portion facing the radiation source.

In one preferred embodiment of the present invention, the shielding block may further include a shielding block for selectively exposing and sealing the radiation source.

In one preferred embodiment of the present invention, the radiation detector may be configured to operate and move simultaneously with the radiation source.

According to another aspect of the present invention, there is provided a method of measuring a radiation shielding performance using the apparatus for measuring a radiation shielding capability, the method comprising: measuring a radiation shielding performance of a subject using a radiation source,

(1) measuring a specific resistance of the test object;

(2) controlling the movement of the radiation source according to a resistivity result of the test object;

(3) loading the DUT;

(4) rotating the loading part on which the DUT is mounted;

(5) measuring the radiation intensity of the test object; And

(6) detecting the intensity of the radiation transmitted through the test object in real time.

In one preferred embodiment of the present invention, after the step (4) or step (5), the step of vertically moving the lifting unit on which the DUT is mounted may be further included.

As described above, the radiation shielding performance measuring apparatus according to the present invention can vary the position of the corresponding region of the object to be measured and the radiation source so that the radiation transmittance can be accurately measured in real time in the tolerance range, It is possible to improve the reliability of the system.

In addition, the radiation shielding performance measuring apparatus according to the present invention further has a specific resistance measurement for preventing an error in the measurement of the radiation shielding performance according to the condition of the object to be tested, thereby achieving more accurate measurement.

1 is a configuration diagram of a radiation shielding performance measuring apparatus according to an embodiment of the present invention;
2 is an operational state diagram of a radiation shielding performance measuring apparatus according to an embodiment of the present invention;
3 is a conceptual diagram illustrating a positional change according to movement of a radiation source according to another embodiment of the present invention;
4 is a flowchart illustrating a process of measuring a radiation shielding performance according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It should be understood, however, that the embodiments are not intended to limit the scope of the present invention, which should be construed to facilitate understanding of the present invention.

The terms used in the examples are used only to illustrate specific embodiments and are not intended to limit the embodiments. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings in order to facilitate a person skilled in the art to which the present invention pertains.

As described above, since the conventional radiation shielding measuring apparatus uniformly measures the fixed region such as the same position or region, there is a problem that the evaluation of the radiation shielding performance with respect to the measurement target can not be accurately measured.

Accordingly, in the present invention, the position of the corresponding region between the test object and the radiation source is variably changed so that the radiation transmittance can be accurately measured in real time in the tolerance range, thereby solving the above-mentioned problem.

FIG. 1 schematically shows a configuration diagram of a radiation shielding performance measuring apparatus according to an embodiment of the present invention.

1, an apparatus 100 for measuring a radiation shielding performance according to the present invention includes a main body 110 having an internal space C isolated from the outside, a main body 110 rotatably disposed on the internal space C, (S), a radiation source (P) for irradiating the upper part of the test object (S) with radiation, a radiation detecting part (160) formed at a corresponding part of the radiation source (P) And a support member 150 for supporting the lower portion.

The support member 150 includes a loading unit 151 for supporting the surface of the object to be tested, a rotation unit 152 formed on the central axis for rotating the loading unit 151, a mounter 153 and a rotation part 152 that is vertically movable.

The main body 110 is formed with an internal space C that is hermetically sealed from the outside. Here, the main body 110 may be provided with a door that can be opened or closed in order to easily replace the object S to be tested.

The inner space C is a space for measuring the shielding performance of the radiation shielding material, that is, the test object S, and a plurality of means for measuring the shielding performance of the test object S are mounted inside.

The radiation source P is formed on the inner upper surface of the main body 110 so as to emit radiation for measuring the radiation intensity and emit downward. At this time, the radiation source P is accommodated in the rectangular shielding block 120 and the opening / closing part 121 is slidable so that the radiation emitted from the radiation source P is released and blocked into the inner space C. Respectively. Accordingly, when the radiation measurement is performed, the opening and closing part 121 is slid to one side.

Here, the radiation source P is not particularly limited, and for example, a substance or apparatus that emits radiation such as a radioactive isotope, a radiation generating apparatus, or the like can be used.

The support member 150 includes a loading unit 151 to which the object S can be loaded by means of supporting the object to be tested S, a rotary shaft 152 that is rotatable about the central axis of the loading unit 151 A mounter 153 fixed to the lower surface of the rotary shaft 152 and a lift 154 formed to allow the mounter 153 to move up and down.

The loading unit 151 may be integrally formed with a rotating shaft 152 formed at a central portion and is rotated in the lateral direction by an external power to rotate the test subject S. At this time, the loading unit 151, on which the test object S is placed by the elevating unit 154, can be moved up and down as necessary.

The elevating portion 154 may be a lifting means such as a hydraulic cylinder, an air cylinder, a conveying screw, or the like as a means for moving the loading portion 151 up and down.

The radiation detector 160 is formed on the upper surface of the mounter 153 and is formed on the facing surface of the radiation source P. Here, the radiation detector 160 is not particularly limited, and for example, a radiation detector such as a GM coefficient tube applying a ionization action, a semiconductor type, or a scintillation coefficient tube employing a fluorescence action can be used.

Hereinafter, a specific operation of the radiation shielding performance measuring apparatus 100 according to the present invention will be described.

FIG. 2 is a diagram illustrating an operation state of a radiation shielding performance measuring apparatus according to an embodiment of the present invention. FIG. 3 is a conceptual diagram illustrating a positional change according to a movement of a radiation source according to another embodiment of the present invention And FIG. 4 is a flowchart illustrating a process of measuring a radiation shielding performance according to an embodiment of the present invention.

2 to 4, a method for measuring a radiation shielding performance according to the present invention includes the steps of: (S10) measuring a resistivity of a subject S, (S30) of rotating the loading part on which the DUT is mounted (S40), measuring the radiation intensity of the DUT (S50), and controlling the movement of the DUT (S60) of detecting the intensity of the radiation transmitted through the test object in real time.

First, in the method of measuring a shielding line shielding performance according to the present invention, a step S10 of measuring a resistivity through an electrode (not shown) attached to a subject S is further performed before measurement of the radiation intensity of the subject S do.

A known technique can be used for measuring the resistivity of the test object S. For example, the electrodes are attached at predetermined positions randomly at predetermined intervals in a state of being connected via a cable. This makes it possible to more accurately measure the radiation shielding performance by identifying the internal structure of the test object (S).

The measuring apparatus and the analyzing apparatus for measuring the resistivity are not particularly limited. For example, the resistivity values measured in real time may be stored in real time as data and displayed visually through the external display unit.

The plurality of non-destructive electrodes are connected to each other through a cable. By applying a current through the electrodes, the resistivity of the test object (S) is measured, The error range of the resultant value of the radiation shielding performance before the radiation intensity measurement can be minimized.

Thereafter, a process of controlling the movement of the radiation source P is performed according to a resistivity result of the test object S (S20).

That is, the test object S is formed in the shape of a circular plate composed of the virtual first region G1 and the second region G2. In the case where the measured value of the resistivity is uniform, the radiation source P is irradiated with the radiation S from the radiation source P, The process of controlling the movement of the object S is omitted and the process of loading the object S is performed (S30).

Specifically, as shown in FIG. 3, when the measured value of the resistivity of the test object S uniformly appears in the entire region, the radiation source P is measured in a state fixed to the first region G1 without moving do. That is, the radiation source P irradiates only the first area G1 to which the first to eighth parts belong, by the rotation of the subject S to be measured.

On the other hand, when the measured value of the resistivity of the test object S shows a significant difference in the entire region, the radiation source P measures the radiation intensity while moving to the second region G2. That is, the radiation source P irradiates the second area G2 to which the ⑨ to ⑫ part belongs by the rotation and the movement of the subject S to be measured. At this time, the radiation detector 160 moves in conjunction with the movement of the radiation source P.

Here, according to the present invention, the radiation source P can reciprocate the first region G1 and the second region G2 at a predetermined speed and time.

Then, in order to perform the radiation shielding performance measurement, the subject S is attached to the loading unit 151 of the radiation shielding performance measuring apparatus 100 (S30). Thereafter, as the opening and closing part 121 of the shielding block 120 slides to one side, the radiation from the radiation source P is emitted into the inner space C of the main body 110.

At this time, the radiation is partially reflected according to the shielding performance of the test object S, a part of the radiation is transmitted and detected through the radiation detecting part 160 formed on the corresponding part of the radiation source P.

Thereafter, as the radiation of the radiation source P is released, the loading unit 151 on which the test object S is placed is rotated around the rotation axis 152 (S40). Here, since the mounter 153 equipped with the radiation detector 160 is formed in a fixed state, the radiation measurement sites are variably moved according to the rotation of the subject S, and the radiation intensities at different portions are measured S50). According to the present invention, the rotational speed of the rotating shaft 152 is preferably within a range in which the same intensity with respect to the irradiated portion of the test subject S irradiated with the radiation of the radiation source P can be maintained. For example, And may be configured to rotate 1 to 5 times during the measurement time.

Then, if necessary, a process of measuring the radiation intensity while raising and lowering the test object S in the vertical direction of the elevation portion 154 of the radiation shielding performance measuring apparatus 100 is performed in order to reduce the radiation shielding performance measurement error (S70).

Finally, the radiation shielding performance of the test object S can be measured by measuring the intensity of the radiation transmitted from the radiation source P through the subject S to the radiation detecting section 160 in real time (S60) .

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood. It is therefore to be understood that the above-described embodiments are illustrative and not restrictive in every respect.

Accordingly, the spirit of the present invention should not be construed as being limited to the above-described embodiments, and all of the equivalents or equivalents of the claims are included in the scope of the present invention will be.

100: radiation shielding degree measuring apparatus 110:
120: shielding block 121: opening /
150: support member 151:
152: rotating part 153:
154: elevating part 160: radiation detecting part
200: electrode C: inner space
P: radiation source S: subject
G1: first region G2: second region

Claims (4)

A main body having an internal space of a predetermined size;
A loading unit for supporting one surface of the object to be tested so that the object to be tested provided in the inner space is rotatably seated, a rotating unit for allowing the loading unit to rotate, a mounter for supporting the rotating unit, A support member including a lift portion formed;
A radiation source which is movably mounted to irradiate a predetermined portion of the object to be examined with radiation;
A shield block selectively exposing and sealing the radiation source; And
And a radiation detector formed at a corresponding portion of the radiation source,
Wherein the radiation source is formed in a circular or elliptical shape so that the radiation source is movable in a virtual first region and a second region with respect to the center of rotation of the support member in accordance with a measured value of resistivity of the subject, As a method using a performance measuring device,
(1) measuring a specific resistance of the test object;
(2) When the measured value of the resistivity of the object to be tested equally appears in the entire region, the radiation source is not moved but is fixed to the first region, and the measured value of the resistivity of the object undergoes a difference Controlling the movement of the radiation source to measure the radiation intensity while moving to the second region if present;
(3) loading the DUT;
(4) rotating the loading part on which the DUT is mounted;
(5) measuring the radiation intensity of the test object; And
(6) detecting, in real time, the intensity of the radiation transmitted through the test object,
The method of claim 1, further comprising the step of: moving the elevation part on which the object to be measured is mounted in a vertical direction to reduce a radiation shielding performance measurement error after step (4) or step (5).
The method according to claim 1,
Wherein the radiation source is operatively associated with the radiation detector and is movably mounted.

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