KR200350999Y1 - Light emitting film for the dectection of radioactive source position - Google Patents

Abstract

The present invention provides a radiation source detection device that visually indicates the position of a radiation source, the first layer comprising a flash material in the region of a flash material that emits light of the first wavelength band in response to incident radiation, and includes a fluorescent material in the region And a second layer for converting a wavelength of light incident from the first layer to convert light of the first wavelength band into light of a second wavelength band, and a third layer that reflects light. It provides a light emitting film for position detection.

Description

Light emitting film for radiation source position detection {LIGHT EMITTING FILM FOR THE DECTECTION OF RADIOACTIVE SOURCE POSITION}

Exposure to radiation continues to occur due to lack of safety awareness by employers, safety managers and workers, and regulatory policies that are different from the site. These radiation exposures not only result in economic losses, but also create social instability in society. Doing.

The equipment used to determine the presence of a radiation source and to warn workers in the radiation area includes a radiation meter, a radiation alarm, an alarm city meter and a pocket city meter.These devices measure radiation to inform the quantified value or to generate an alarm. Done.

Current radiation measuring devices have to be worn and managed by the worker at every operation, and the inconvenience of use has not been able to play a role of keeping the safety of the worker in combination with a poor working environment. The current equipment is therefore a burden on work rather than providing a convenience and safe environment for the workers. That is, personal storage and management of radiation measuring instruments, individual exposure dosimeters, alarm meters, etc. are a great burden for workers who suffer from excessive work. Of these, personal exposure dosimeters carry out work while the worker is carrying them on their body. However, when the work is finished, it is designed to connect to the dosimeter reader and transmit it directly. Therefore, even if there is an accident, the worker is aware of the exposure room already after the worker has been exposed. Having an alarm means that the radiation has entered the alarm that the worker possesses after the alarm has occurred, so that the fact that it has already been exposed has not changed, and the location of the radiation source is accurate except for the rough direction. Example of thinking with existing technology From the point of view of the room, the effect is vulnerable.

In addition, most instruments are not small enough to be carried by a general user and have a disadvantage in that the sensing performance of radiation varies depending on the direction when the size is small.

In addition, since the radiation detector used for radiation measurement has very different detection characteristics according to the physical quantity to be measured, it is very important to select a suitable radiation meter according to the working environment, and the detection principle, operation characteristics and The hassle of having to provide a suitable measuring instrument by understanding the reliability and stability of a measured value arises. In addition, most radiometers are expensive and difficult to handle, making it difficult for general workers to use.

However, from the point of view of the safety and ease of operation of the general worker rather than the precise measurement of radiation, rather than measurement of the intensity of the radiation, the presence or absence of a radiation source and location information is more important information if the radiation source is located somewhere. Conventional instruments and detectors, however, measure radiation to provide quantified values and trigger alarms, but do not provide information about location, and visually recognize information that humans perceive as hearing, such as alarms. Given that the quality of information is much lower than the information that is provided, it is difficult to secure the safety of workers because it is difficult to detect the location of the radiation source by the information provided by the auditory alone, and the existing ones mean that the worker should have a measuring instrument or detector. As a central alarm, this has a major weakness in the prevention of accidents since it is very likely that it has already been exposed by a radiation source at the time of measurement. Therefore, there is a need to shift the detection of radiation to the concept of radiation center.

In Korea, we have developed a remote automatic manipulator for gamma irradiator for industrial use, and developed a radiation detection system using GM tube, an automatic alarm device composed of alarm / light emitting device and circuit, but it is not competitive due to its bulky and expensive cost. However, we have conducted a design and test fabrication of a micro-source proximity survey device that can control the transfer and return of the dose rate source used for medical purposes to the affected area, but this is for the application in medical field for the treatment of patients. It is impossible to use it with a gamma ray irradiator.

The present invention to solve the problems as described above,

It is an object of the present invention to provide a device for giving visual information about the location of radiation.

In addition, it is an object of the present invention to provide a radiation source detection device that visually informs the position of the radiation source.

In addition, an object of the present invention is to provide a radiation source detection device that has a simple structure and is easy to use.

1 is a view showing an embodiment of a light emitting film for position detection according to the present invention.

Figure 2 is a view showing another embodiment of a light emitting film for position detection according to the present invention.

3 shows a radiation irradiator constructed using a film for radiation source position detection.

Figure 4 shows an embodiment of a conventional guide tube used in the irradiator and the guide tube according to the present invention.

<Explanation of symbols for the main parts of the drawings>

1: first layer 2: second layer

3: 3rd layer 4: light emitting layer

5: Reflective layer 11: Stainless steel layer

12: plastic hose layer 13: light emitting film layer

In order to solve the above problems, the present application provides a light emitting film for detecting the position of a radiation source visually indicating the position of the radiation source, the light emitting film is a flashing material that emits light of the first wavelength band in response to incident radiation A first layer made up of; A second layer attached to the first layer, the second layer including a fluorescent material in the region for converting a wavelength of light incident from the first layer to convert light of the first wavelength band into light of a second wavelength band; Can be.

The light emitting film may include a third layer that reflects light in the first wavelength band and the second wavelength band outside the first layer.

In the light emitting film, the second layer may include a coating film layer for increasing visibility to the outside thereof.

In the light emitting film, the first wavelength band may be a region of 250 to 450 nm.

In the light emitting film, the second wavelength band may be in a range of 400 to 700 nm.

In the light emitting film, the second layer may include a photochromic material.

Solvent materials constituting the first layer and the second layer are polyvinyl benzene (polyvinyl benzene), polyvinyl toluene (PVT), polystyrene (PS), polyvinyl chloride (PVC), polymethathymethacrylate (PMMA), and polypropylene (PP). It can be one.

The solutes constituting the first layer are p-terphenyl (p-terphenyl), DPO (Diphenyl oxamide), PBD ((2-phenyl) -5- (4-biphenylyl) -1,3,4-oxadiazole), PBBO It may be one of (2- (4-biphenyl) -6-phenylbenzoxazole).

The solutes constituting the second layer are POPOP (1,4-bis (5-phenyloxazol-2-yl) benzene), TBP (tributyl phosphate), BBO (2,5-di (4-biphenylyl) oxazole), DPS ( diphenylstilbene), PBBO (2- (4-biphenyl) -6-phenylbenzoxazole).

The light emitting film for detecting the position of the radiation source may include a light emitting layer including a flash material emitting light of a first wavelength band in response to incident radiation and a fluorescent material converting light of the first wavelength band to light of a second wavelength band in a region. .

The light emitting layer may further include a reflective layer reflecting light of the first wavelength band and the second wavelength band on at least one outer surface, wherein the first wavelength band is an area of 250 to 450 nm, and the second wavelength band is 400 to 450 nm. It may be an area of 700 nm. In addition, the light emitting layer may include a photochromic material.

Hereinafter, with reference to the accompanying drawings will be described in detail the invention.

1 is a view showing an embodiment of a light emitting film for position detection according to the present invention. Arrows in the figure indicate the incidence of radiation. The first layer 1 is a material containing a flash material and reacts with radiation to emit light which is insensitive to the human eye in the 250 to 450 nm region (blue). The decay time is very fast, such as nano seconds.

The second layer 2 serves as a wavelength shifter as a material containing a fluorescent material. It absorbs light in the 250-450 nm region and emits light sensitive to the human eye in the 400-700 nm region (green / yellow). Fluorescent dyes can emit a variety of light, including green, yellow, and red, depending on the type.

The third layer 3 is a reflective paint layer applied to the outside of the first layer 1 and serves to reflect light having a wavelength in the range of 250 to 700 nm. It is also possible to use a reflective material such as a reflective coating or an aluminum film in place of the reflective paint for the third layer 3.

It is also possible to further provide a coating film layer outside the second layer (2) to increase visibility.

When radiation passes through the third layer 3 and enters the first layer 1 and reacts with the plastic scintillation material of the first layer 1, short-wavelength flashes are generated. This light enters the second layer 1 again and interacts with the wavelength shifter or fluorescent material to generate light having a wavelength sensitive to the human eye. The incident radiation may be gamma rays, X-rays or charged particle beams. The thickness of the film may vary from several millimeters to nanometers depending on the type and intensity of the radiation source.

The flash material of the first layer 1 emits light in the range of 250 to 450 nm in response to incident radiation, and the light enters the second layer 2 and reacts with the fluorescent material to emit light in the region of 400 to 700 nm. Done. The third layer 3 serves to reflect the light emitted from the first layer 1 to be incident on the second layer 2 without being emitted to the outside.

It is also possible to use a photochromic material instead of adding a fluorescent die to the second layer 2. A photochromic substance is a substance whose color is changed by absorbing light in the ultraviolet region and changing its absorption wavelength band. When the light in the ultraviolet region no longer enters, it returns to its original color. Accordingly, the incident radiation generates light in the ultraviolet region of the first layer 1 and then the ultraviolet rays are incident on the second layer 2 to react with the photochromic material to change the color of the film itself.

2 is a view showing another embodiment of a light emitting film for position detection according to the present invention. The light emitting film for detecting the position of the radiation source illustrated in FIG. 2 is composed of only one light emitting layer 4, and the light emitting layer 4 includes both a flash material and a fluorescent material. The flash material included in the light emitting layer 4 generates light in the wavelength band of 250 to 450 nm in response to incident radiation, and the fluorescent material included in the light emitting layer 4 emits light in the wavelength range of 250 to 450 nm. It converts wavelengths in the 400-700nm range that are sensitive to the eye.

Light generated by radiation is attached to both surfaces of the light emitting layer 4 by attaching a reflective paint that reflects light having a wavelength of 250 to 700 nm or a reflective layer 5 made of a reflective material such as a reflective coated aluminum film. It is possible to further increase the utilization efficiency of the flash by preventing it from being scattered to the outside. The reflective layer 5 may be attached to one or both sides of the light emitting layer 4.

In addition, by using or using a photochromic material instead of a fluorescent material, the incident radiation is shifted to the ultraviolet region, and then the photochromic material absorbs light in the ultraviolet region, thereby changing the absorption wavelength of light of the photochromic material itself. You can also change the color as you enter.

3 shows a radiation irradiator constructed using a film for detecting the position of a radiation source. The irradiator typically consists of a container, a remote control and a guide tube. The dual guide tube is the source of radiation and is usually made of plastic material over a rigid stainless corrugated tube. Such a conventional guide tube generates only the information and the alarm sound that it is simply located in the guide tube, even if the radiation source is fixed therein. However, the radiation source position detecting film may be attached to the outside of the guide tube as shown in FIG. 3, or may be used instead of the radiation source position detecting film instead of the plastic material of the existing guide tube. In this case, as the radiation source moves through the guide tube, the light emitting film at the corresponding position may emit light to indicate the position of the radiation source. Therefore, it is possible to prevent an accident in which an operator performs an inspection in a state where the radiation source is not safely returned to the storage container due to a mechanical defect or a user mistake. In addition, it provides very effective information even when the radiation source is stuck in the middle of the guide tube due to mechanical damage. The existing measuring instrument emits only the alarm sound, and thus the light emitting film informs the position of the radiation source in the guide, thereby enabling safe and rapid recovery of the source, thereby improving worker safety.

4 is a view showing an embodiment of a conventional guide tube used in the irradiator and a guide tube according to the present invention. Figure 4a is made of a conventional guide tube coated with a plastic material on a rigid stainless corrugated tube. Figure 4b is made of a light emitting film in the form of a tape on the outside of the conventional guide tube and attached to the outside. Figure 4c is produced by replacing the plastic hose material of the guide tube with a light emitting film material. In the guide tube having such a configuration, as the radiation source moves the guide tube, the light emitting film at the corresponding position emits light to indicate the position of the radiation source.

When the light emitting film as described above is used in the industrial field as a guide tube of a gamma ray irradiator, unlike a conventional radiation measuring instrument or alarm using expensive and bulky equipment such as a GM tube, it is possible to visually inform a worker of the position of a radiation source. Effective radiation detection and alarming is possible.

In addition, since the light emitting film has a simple structure and is very convenient to use, it can be used in radioisotope companies, power plants, industries, research institutes, military units, medical sites, etc. It can be used anywhere and its scope of application is very wide.

In addition, soldiers as well as civilians have been reported to be heavily affected by radiation exposure in battlefields and areas where nuclear tests have been conducted. Therefore, the market is expected to expand significantly if the radiation detection and alarm that can be used not only for the industry but also for military or civil use using the light emitting film.

In addition to the above examples, since the light emitting film for detecting the radiation source position is attached to a place where the radiation is exposed or a high exposure risk, the application of the radiation can be easily recognized.

On the other hand, the present invention is not limited to the above-described embodiment and can be carried out by modifying and modifying within the scope not departing from the gist of the present invention, the technical idea that such modifications and variations are also to be regarded as belonging to the following claims.

Claims (13)

A first layer made of a flash material emitting light of a first wavelength band in response to incident radiation; A second layer attached to the first layer and converting a wavelength of light incident from the first layer to convert a light of the first wavelength band into a light of a second wavelength band; Light emitting film for position detection, comprising. The light emitting film of claim 1, further comprising a third layer reflecting light in the first wavelength band and the second wavelength band outside the first layer. The light emitting film of claim 1, wherein the second layer comprises a coating film layer for increasing visibility to the outside thereof. The light emitting film of claim 1, wherein the first wavelength band is in a region of 250 to 450 nm. The light emitting film of claim 1, wherein the second wavelength band is in a range of 400 to 700 nm. The light emitting film of claim 1, wherein the second layer comprises a photochromic material, According to any one of claims 1 to 6, wherein the solvent layer constituting the first layer and the second layer is polyvinyl benzene (polyvinyl benzene), PVT (polyvinyl toluene), PS (polystyrene), PVC (polyvinyl) chloride), PMMA (polymethathymethacrylate), PP (polypropylene) The solute constituting the first layer is p-terphenyl (P-terphenyl), Diphenyl oxamide (DPO), PBD ((2-phenyl) -5- (4). -biphenylyl) -1,3,4-oxadiazole), PBBO (2- (4-biphenyl) -6-phenylbenzoxazole), one of the light emitting film for position detection The solute constituting the second layer is POPOP (1,4-bis (5-phenyloxazol-2-yl) benzene), TBP (tributyl phosphate), BBO (2). Light emitting film for position detection of one of -5-di (4-biphenylyl) oxazole), DPS (diphenylstilbene) and PBBO (2- (4-biphenyl) -6-phenylbenzoxazole) A light emitting film for detecting a position of a radiation source, comprising a light emitting layer including a flash material reacting with incident radiation to emit light of a first wavelength band and a fluorescent material converting light of the first wavelength band to light of a second wavelength band in a region. The light emitting film of claim 10, wherein the light emitting layer further comprises a reflecting layer reflecting light on the first wavelength band and the second wavelength band on at least one outer surface. The light emitting film of claim 10, wherein the first wavelength band is in a region of 250 to 450 nm, and the second wavelength band is in a region of 400 to 700 nm. The light emitting film of claim 10, wherein the light emitting layer comprises a photochromic material.