JP3004610U - Radioactive dust monitoring system - Google Patents

Abstract

(57) [Summary] [Purpose] To construct a low-cost radiation dust monitoring system that can easily manage various data indicating measurement conditions. [Structure] A sampler identification code display portion is formed on the dust sampler 18, and a card identification code display portion 1 is provided on a filter paper card 10 housed in the dust sampler 18.
6 is formed. In the flow meter 20, a flow rate identification code display section 24 is formed corresponding to each scale. The first identification code reader 26 reads these identification codes and sends the data to the management device 34. The radiation detection device 32 is also provided with a detector identification code display section. Since the data can be input by optically reading the identification code with the second identification code reader 35, the data can be easily managed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a radioactive dust monitoring system that facilitates data management.

[0002]

[Prior art]

 At radiation-handling facilities such as nuclear power plants, it is necessary to measure the concentration of radioactive dust contained in the air in each room to control internal exposure. The radioactive dust monitoring system is a system for that purpose.

In the system, a dust sampler is installed at each monitor position in the facility, and a filter paper card is set on the dust sampler. Then, air is introduced into the dust sampler for a predetermined time. After that, the filter paper card is taken out, and the radiation detector detects the radiation from the dust on the filter paper card. As a result, the radioactivity concentration at each monitor position is calculated based on the detected data. The flow rate of air in the dust sampler can be confirmed by a float type flow meter connected to the dust sampler. By the way, there is a system in which a radiation detector is built in each dust sampler and the detection data is transmitted as an electric signal, but the system becomes expensive. On the other hand, using a filter paper card can reduce the system cost.

A large number of dust samplers are installed in the facility, and a large amount of filter paper cards are collected at one time. Therefore, it tends to be confused after collecting each filter paper card. Therefore, the conventional filter paper card is provided with a column for describing the measurement conditions, and the card is managed by entering necessary items in the column.

Further, conventionally, a filter paper card provided with a magnetic recording portion, a punched storage portion provided with perforations, and the like have been devised (for example, see Japanese Patent Application No. 54-074035).

[0006]

[Problems to be solved by the device]

 However, the method of providing the description fields on the filter paper card and entering the measurement conditions there is complicated by a lot of human work, and there is a risk of mistakes in the description. Further, the method of providing the magnetic recording unit, etc. reduces the complexity of such data management, but increases the system cost.

On the other hand, in the past, the flow rate was managed by direct reading by the administrator, which was complicated. Since a flow meter is installed for each dust sampler, the more monitors there are, the more complicated it becomes. Note that the method of electrically measuring the flow rate value and the like and transmitting it as an electric signal causes a system cost increase.

The present invention has been made in view of the above conventional problems, and an object thereof is to provide a low-cost radiation dust monitoring system capable of easily managing measurement condition data.

[0009]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, a device according to claim 1 is a filter for adhering radioactive dust, comprising a filter paper card on which a card identification code display portion is formed, and a dust collecting device for accommodating the filter paper card. There is a dust sampler having a sampler identification code display part, and a device for measuring the flow rate in the dust sampler, and a flow meter having a flow rate identification code display part corresponding to each flow rate value, It is characterized by including a card identification code, a sampler identification code, and an identification code reader for optically reading the flow rate identification code.

According to a second aspect of the present invention, there is provided a card tray on which the plurality of filter paper cards are placed at the same time, and a plurality of radiation detectors for detecting radiation with respect to the plurality of filter paper cards on the card tray. The present invention is characterized in that a detector identification code display portion is formed on the card tray in correspondence with the set position of the filter paper card.

According to a third aspect of the present invention, the identification code reader further optically reads the detector identification code.

According to a fourth aspect of the present invention, the management device includes a management device that manages the data read by the identification code reader and the detection data of each of the radiation detectors, and the management device includes a radioactivity concentration for each filter card. Is calculated.

The invention according to claim 5 is characterized in that each of the identification code display portions is a bar code display portion.

The invention according to claim 6 is characterized in that the card identification code display portion is exposed to the outside in a state where the filter paper card is accommodated in the dust sampler.

The invention according to claim 7 is characterized in that the plurality of flow rate identification code display portions are aligned and formed on both sides thereof in correspondence with the scale of the flow meter.

[0016]

[Action]

 According to the configuration of claim 1, an identification code (card identification code, sampler identification code, flow rate identification code) is assigned to each flow rate value of each filter paper card, each dust sampler, and flow meter. By optically reading the identification code with the identification code reader, the measurement condition can be easily and error-free converted into an electric signal without any special treatment. That is, simply by bringing the identification code reader close to the identification code display, data such as filter paper card number, measurement location, flow rate at measurement start (when card is set), flow rate at measurement end (when card is collected), etc. can be easily obtained. Can be obtained. In that case, data such as the measurement start date and time and the measurement end date and time may be input manually or automatically.

In particular, when an inexpensive float type flow meter that cannot electrically read the flow value is used because the identification code is assigned to the indicated value of the flow meter, after reading the flow value, The complexity of data management can be eliminated.

According to the configurations of claims 2 and 3, since the detector identification code display portion is formed on the card tray, after the filter paper card is set, the detector identification associated with the filter identification card is set. By reading the code with an identification code reader, the filter paper card and the radiation detector (detection data) can be associated with each other in terms of data management. In other words, it is not necessary to separately enter the information on the position where the filter paper card is set using a keyboard or the like.

That is, according to the present invention, each data is input in the form of reading the identification code, and the data that needs to be input are collectively managed by the identification code. This eliminates the conventional complications and input mistakes.

According to the configuration of claim 4, the management device manages various data input as the identification code, and collates with the detection data of the radiation detector to automatically calculate the radioactivity concentration.

According to the fifth aspect of the invention, since each identification code is a so-called bar code, an existing bar code printer or bar code reader can be used.

According to the configuration of claim 6, since the card identification code display portion is exposed to the outside in the housed state of the dust sampler, the card identification code can be read using the identification code reader even in the housed state. It will be possible.

According to the configuration of claim 7, the flow rate identification code display portion is arranged on both sides of the flow rate scale, and the administrator directly reads the flow rate and displays the flow rate identification code display portion corresponding to the flow rate. Read the flow rate by bringing the identification code reader close to it.

[0024]

【Example】

 Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows the overall configuration of the radioactive dust monitoring system according to the present invention. In this system, a filter paper card 10 for adhering radioactive dust is used. The filter paper card 10 is composed of a circular filter paper 12 and a mount 14 that forms the frame of the filter paper 12, and a card identification code display portion 16 is formed at the edge of the mount 14.

In the present embodiment, the card identification code display section 16 is composed of a bar code composed of a card number for identifying each filter paper card 10. That is, a sticker having a bar code printed by a bar code printer (laser printer) not shown is attached to the filter paper card 10. The filter paper card 10 is set on the dust sampler 18 installed at each monitor position of the radiation handling facility.

The system of this embodiment includes, for example, 30 dust samplers 18, and the filter paper card 10 is set in each dust sampler 18. The dust sampler 18 is a device for sucking indoor air and adsorbing radioactive dust to the filter paper 12 of the filter paper card 10 which is a filter. The dust sampler 18 has a flow rate for measuring the flow rate of air in the dust sampler 18. A total of 20 are provided.

In this embodiment, a so-called float type flow meter is used as the flow meter 20 and is directly read by an administrator. On both sides of the scale 22 in the flow meter 20, a plurality of flow rate identification code display portions 24 are arranged in alignment with the left side and the right side slightly offset. Similar to the card identification code display section 16 described above, the flow rate identification code display section 24 is formed by printing a barcode, and the flow rate identification code display section 24 is formed corresponding to each flow rate value. Of course, since the reading resolution is determined by the number of flow rate identification code display portions 24, the number of flow rate identification display portions 24 may be determined according to the required reading accuracy.

Since the flow meter 20 is configured as described above, the administrator confirms the floats on the scale 22, and the flow rate identification code display portion 24 corresponding to the scale indicated by the float or a value near the scale. Is identified and the identification code is read using the first identification code reader 26.

The first identification code reader 26 is a device for optically reading a card identification code, a flow rate identification code, and a sampler identification code and a detector identification code which will be described later. For example, an existing bar code reader is used. Can be used. The first identification code reader 26 is provided with various input keys 28, such as a reading start key.

The first identification code reader 26 has a memory (not shown) for storing the measurement condition data, and as described later, the filter paper number, sampler number, start date and time, collection date and time. The measurement condition data such as the flow rate at the start and the flow rate at the time of recovery are stored. These data are read when the first identification code reader 26 is mounted on the rack 30 and transferred to the management device 34 described later via the signal line 100. The rack 30 thus reads and transfers data and charges the first identification code reader 26.

The radiation detection device 32 has ten radiation detectors in this embodiment. That is, ten filter paper cards 10 can be measured at the same time, and ten card holders are formed in the card tray 33 for this purpose. In the state where the card tray 33 is housed inside the radiation detecting device 32, each radiation detector faces the filter paper 12 of each filter paper card 10.

The second identification code reader 35 has no memory function or is an apparatus for optically reading the detector identification code, and is connected to the radiation detection apparatus 32 by the cable 104. The radiation detection device 32 is connected to the management device 34 by the cable 102, and the data read by the second identification code reader 35 and the detection data of each radiation detector are transmitted to the management device 34.

The management device 34 is composed of a computer system, and is composed of a main body 36, a display 38, and a keyboard 40. The management device 34 has a function of managing each input data and a function of calculating a radioactivity concentration.

FIG. 2 shows a perspective view of the dust sampler 18 and the flow meter 20. The dust sampler 18 and the flow meter 20 are mounted on a plate 50 fixed to a wall surface, and the plate 50 is provided with a sampler identification code display portion 52 for identifying the dust sampler 18. The sampler identification code display section 52 is composed of a sticker on which a barcode is printed, like the card identification code display section 16 and the like described above.

Further, FIG. 3 shows a top view of the card tray 33 housed in the radiation detection device 32, and the detector identification code display portion 54 is provided near the card holder position holding the filter paper card 10. Has been formed. The detector identification code display unit 54 represents the number of the radiation detector in charge of detecting the radiation of each filter paper card 10, and is for associating each filter paper card 10 with each detector in a one-to-one correspondence. is there.

FIG. 4 shows a specific structure of the measurement condition data table formed on the memory of the management device 34. This table shows the sample number corresponding to the card identification code, the dust sampler number corresponding to the sampler identification code, the start date and time indicating the date and time when the filter paper card was set, the collection date and time indicating the date and time when the filter paper card was collected, and the filter paper card. It is composed of various data such as the flow rate at the start when the is set and the flow rate at the time of recovery when the filter paper card is collected. That is, these data are obtained as a result of reading the card identification code display unit 16, the sampler identification code display unit 52, and the flow rate identification code display unit 24 by the first identification code reader 26. Yes, the start date and time and the collection date and time are automatically specified by the first identification code reader 26 at the time of reading.

FIG. 5 shows a detection data management table formed on the memory of the management device 34. This table includes each data of the radiation detector number in the radiation detection device 32, the sample number indicating the filter paper card number, and the radiation detector count value indicating the count value of each radiation detector.

FIG. 6 shows the relationship between the sample number displayed on the display 38 and the radioactivity concentration.

Next, the operation of the radioactive dust monitoring system according to the present invention will be described with reference to the drawings.

First, a method of manufacturing the filter paper card 10 will be described. The filter paper card 10 is formed by attaching a circular filter paper 12 to a mount 14 having a circular opening, and further attaching a bar code sticker created by a bar code printer. In the present embodiment, the bar code is used as the identification code in order to reduce the cost, but it goes without saying that other forms of code can be used as long as the identification code can be optically read.

The filter paper card 10 manufactured as described above is inserted into the dust sampler 18 by a manager through a slit formed in the upper part of the dust sampler 18. In this embodiment, in the inserted state, the upper part of the filter paper card 10, that is, the card identification code display portion 16 is exposed to the outside. This allows the card identification code to be read even after the filter paper card 10 is set on the dust sampler 18. It should be noted that after the filter paper card 10 is inserted, the gap is closed by a not-shown crimping mechanism, and the radioactive dust is efficiently adsorbed.

As described above, after the filter paper card setting is completed, the pump (not shown) is driven to suck the indoor air. At that time, the administrator uses the first identification code reader 26 to first read the sampler identification code display section 52 shown in FIG. That is, the sampler identification code display section 52 is read to specify the monitor position. After that, the card identification code display section 16 formed on the filter paper card 10 is read, and the correspondence relationship between the dust sampler 18 and the filter paper card 10 is established. Along with this, the administrator reads the scale of the flowmeter 20, and the first identification code reader 26 reads the flow rate identification code display portion 24 corresponding to the scale. This makes it possible to easily read the starting flow rate as an electrical signal without using a keyboard or the like.

When reading the sampler identification code display section 52 or other reading, the measurement start date and time is automatically stored in the memory in the first identification code reader 26.

The processing at the start of measurement as described above is performed for each dust sampler 18. When the administrator subsequently mounts the first identification code reader 26 on the rack 30, each data stored therein is automatically transferred to the management device 34 via the signal line 100. Of course, each data may be collectively transmitted to the management device 34 at the end of the measurement. After the radioactive dust is monitored for a predetermined time, the manager collects the filter paper card 10. At the time of collection, first, the identification code is read by the first identification code reader 26 on the sampler identification code display section 52 (or the card identification code display section 16) to identify the filter paper card 10 to be started. To do. Then, the flow rate value of the flow meter 20 is read while the pump is activated, and the identification code is read on the flow rate identification code display section 24 corresponding to the indicated value. As a result, the flow rate data at the time of recovery will be captured. Even during this collection, the date and time data is automatically stored in the memory in the first identification code reader 26 when reading the sampler identification code display section 52, for example.

Since the flow rate changes according to the amount of radioactive dust accumulated on the filter paper 12 of the filter paper card 10, the flow rate at the time of collection is measured in addition to the flow rate at the start in this embodiment. In the management device 34, the difference between the flow rate at the start and the flow rate at the time of recovery is calculated, and the radioactivity concentration is calculated by assuming that the flow rate has changed linearly.

As described above, each identification code is read by the first identification code reader 26, and each data is transmitted to the management device 34 via the rack 30. Further, the detector identification code is read by the second identification code reader 35, and the data is directly transmitted to the management device 34 without passing through the rack 30. The management device 34 creates the measurement condition data table shown in FIG. 4 using each data.

On the other hand, after the measurement is completed, the filter paper card 10 is taken out from the dust sampler 18 and collected. Then, as shown in FIG. 1, each filter paper card 10 is set in each card holder of the card tray 33. The state is shown in FIG.

When each filter paper card 10 is set, the card identification code display portion 16 on each filter paper card and the detector identification code display portion 54 formed on the card tray 33 are in close proximity to each other. The identification code pairs are sequentially read using the first identification code reader 26. That is, for example, after reading the first detector identification code display portion 54, the card identification code display portion 16 of the filter paper 10 set in the first card holder is read, and this is repeated up to the tenth.

Then, the card tray 33 is housed in the radiation detection device 32, and radiation detection is executed for a predetermined time. The data indicating the correspondence between the detector number and the sample number and the detection data of each radiation detector are automatically sent to the management device 34 via the signal line 102. The detection data management table shown in is created.

Based on the contents of the measurement condition data table and the detection data management table described above, the management device 34 calculates the radioactivity concentration for each sample (filter paper card), which is shown in FIG. The display format is displayed on the display 38.

As described above, according to the present embodiment, by using the identification code (bar code), various data can be input to the management device 34 easily and without error. In particular, in this embodiment, since the data of the flow rate value in the flow meter 20 can be converted into an electric signal in the form of reading the identification code, there is an advantage that the system can be configured without using an expensive flow meter. Furthermore, since the filter paper 10 and the detector can be surely associated with each other on the card tray 33, it is possible to solve the problem that the detection data is erroneously associated with another sample.

[0053]

[Effect of device]

 As described above, according to the present invention, various data can be easily and surely input, and the system can be configured at low cost. Therefore, the complexity of data management can be eliminated.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an overall configuration of a radioactive dust monitoring system according to the present invention.

FIG. 2 is a perspective view of a dust sampler and a flow meter.

FIG. 3 is a top view of a card tray.

FIG. 4 is an explanatory diagram showing a measurement condition data table.

FIG. 5 is an explanatory diagram showing a detection data management table.

FIG. 6 is a diagram showing a display example.

[Explanation of symbols]

 10 Filter paper card 16 Card identification code display section 18 Dust sampler 20 Flow meter 24 Flow rate identification code display section 26 First identification code reader 32 Radiation detection apparatus 34 Management apparatus 35 Second identification code reader 52 Sampler identification code display section 54 Detection Vessel identification code display

Claims (7)

[Scope of utility model registration request] 1. A filter for adhering radioactive dust, comprising a filter paper card on which a card identification code display section is formed, and a dust collector which houses the filter paper card, wherein a sampler identification code display section is formed. A dust sampler and a device for measuring the flow rate in the dust sampler,
Radioactivity characterized by including a flow meter with a flow rate identification code display corresponding to each flow rate value, a card identification code, a sampler identification code, and an identification code reader for optically reading the flow rate identification code. Dust monitoring system. 2. The system according to claim 1, wherein a card tray on which the plurality of filter paper cards are placed at the same time, and a plurality of radiation detectors for performing radiation detection on the plurality of filter paper cards on the card tray, A radioactive dust monitoring system, comprising: a radiation detection device having a detector identification code display portion formed on the card tray corresponding to a set position of a filter paper card. 3. The radioactive dust monitoring system according to claim 2, wherein the identification code reader further optically reads the detector identification code. 4. The system according to claim 3, further comprising a management device that manages the data read by the identification code reader and the detection data of each of the radiation detectors, wherein the management device has a radioactivity for each filter paper card. Radioactive dust monitoring system characterized by calculating concentration. 5. The radioactive dust monitoring system according to claim 4, wherein each identification code display section is a bar code display section. 6. The radioactive dust monitoring system according to claim 5, wherein the card identification code display portion is exposed to the outside in a state where the filter paper card is accommodated in the dust sampler. 7. The radioactive dust monitoring system according to claim 5, wherein the plurality of flow rate identification code display portions are aligned and formed on both sides of the flow rate meter corresponding to the scales.