JPH06281745A - Device and method for sampling cassette type smear filtering paper sample - Google Patents

Abstract

PURPOSE:To improve handling without causing a worker to touch a contaminated material directly by forming smear filtering papers into a cassette and then sealing samples after they are sampled and then housing them in a cassette. CONSTITUTION:In a cassette 2, a feed roller 21 feeds out a sample tape 3 and then a take-up roller 22 winds it up. When rollers 21 and 22 are fitted to a feed shaft 211 and a take-up shaft 221 of a device 1, a head 11 protrudes toward the lower part and the tape 3 of a cut-out part 23 is located on the lower side of the head 11, thus enabling the tape 3 to come into contact with the head 11 positively. The move of the tape 3 is locked for enabling sampling, the device 1 is held for enabling the head 11 to be pressed against a surface to be measured, and then the device 1 is moved back and forth for wiping off the radiation on the target surface with the tape 3. After the sample is sampled, the lock is released 14 and a sampling position is marked 12 with a black point on the rear surface of the tape 3 and the part of the tape 3 whose sampling is completed, is sealed 4 when the tape 3 is wound up, thus preventing a radioactive substance from being peeled from the tape 3 and hence saving man-power for manual operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cassette type smear filter paper sampler and a cassette type smear filter paper sample collection method for use in a nuclear power plant or the like in a radiation controlled area to measure the radioactive contamination density.

[0002]

2. Description of the Related Art Conventionally, as a method for measuring the density of radioactive surface contamination, for example, a wiping-type radioactive surface contamination measuring method (J
IS Z 4504). This wiping-type radioactive surface contamination measuring method (hereinafter referred to as the Smear method) is generally composed of the following four steps. (1) Preparation process Prepare the required number of smear filter papers (such as tadpole-shaped filter papers specified in JIS Z 4504) in the holder, and write identification symbols such as N0 and mark on the back surface of the smear filter papers. (2) Sampling process A worker wearing protective clothing wears smear filter paper at the measurement point with the fingertips of protective gloves and wipes off a certain area. (JIS
Z 4504). (About 1 point Sumi filter paper 1
In this case, in this case, fine powder of radioactive pollutants adheres to the surface of the smear filter paper. (3) Sample preparation step Attach a sealer such as Reifan paper to the smear filter paper to prevent recontamination from the smear filter paper and preserve the sample. (4) Sample measurement process Set the sampling smear filter paper one by one in the measurement dish, measure the radioactivity, and calculate the surface contamination density. Since a series of these four-step Smear method work is conventionally performed manually, it requires a lot of work time, the amount of work is enormous, and it is not desirable for the health and safety of workers. Nakatsuta.

For this reason, there have been proposed several devices for automatically wiping a radioactively contaminated surface with a smear filter paper. For example, Japanese Unexamined Patent Publication No. 60-171477 is such an example. According to this, although the above drawbacks are solved,
However, the automatic wiping device can be used only when the target to be wiped is specified, such as the fuel rod, floor, wall surface, etc. I haven't.

[0004]

According to the present invention, the work time required for sampling can be greatly shortened, the operation is simple, the risk of radiation exposure to workers is extremely low, and it is safe and portable. A small cassette-type smear filter paper sampling device and a cassette-type smear filter paper sampling method that can be operated with only one hand during sampling are proposed.

[0005]

In order to solve the above-mentioned problems, the cassette type smear filter paper sampling device of the present invention comprises:
It has a feed roller for storing a continuous smear filter paper sample tape in a roll shape, and a take-up roller for winding the smear filter paper sample tape after it is sent out, and has a predetermined cutout portion. A cassette, a head at the tip of the cassette, which is located in the notch of the cassette and is in a state of protruding from the sampling device at the time of sampling, and a smear filter paper sample table after sampling.
Seal tape for sealing the collected surface of the tape, and tape feed roller for pressure-sealing the smear filter paper sample tape and seal tape after sampling. And a marking device for marking a sample point on a smear filter paper sample tape by keeping a certain distance from the head at the time of sampling, and a smear that has been sampled by driving the winding roller. The cassette-type smear filter paper sampling device comprises a winding device for winding the filter paper sample tape and has a notch corresponding to the lower surface of the notch of the cassette. -The structure is characterized in that the tape is arranged in the cassette. Further, the winding device can be either of a manual type or an electric type.

Further, according to the cassette type smear filter paper sample collecting method of the present invention, the smear filter paper sample tape is housed in a cassette, the cassette is mounted on the sample collecting device, and the sample collecting tip in the sample collecting device is mounted. The smear filter paper sample tape is brought into contact with the head by projecting the head of the smear filter paper sample out of the sampling device, and the movement of the smear filter paper sample tape is locked, and the smear filter paper sample tape is collected on the surface to be sampled. It is characterized by rubbing, then marking this smear filter paper sample tape, adhering the seal tape on this collected smear filter paper sample tape, and winding it up in a cassette. It is a composition.

[0007]

Since the sampling device is constructed as described above, the preparation of a cassette of smear filter paper unifies the preparation of a plurality of samples, and the function of feeding the sample tape and the automatic seal function are The exchange and sample adjustment processes can be integrated and rationalized, and labor saving can be achieved compared to conventional manual work. Further, after the sample is collected, the sample is sealed and further stored in the cassette, so that the worker does not directly touch the contaminated sample and the handling property is improved.

Further, there is provided a small cassette type smear filter paper sampler and a cassette type smear filter paper sample collection method which is portable and can be operated with one hand to collect samples with good workability.

[0009]

EXAMPLE FIG. 4 shows an external view of a sampling operation using the cassette type smear filter paper sampling apparatus 1 according to the present invention. At the time of sampling, when the head 11 is projected downward from the cassette type smear filter paper sample collecting device 1 as shown in the figure, the smear filter paper sample tape 3 is pushed downward by the head 11. In this state, as shown in the figure, put one hand on the strap above the cassette-type smear filter paper sampling device 1 and hold the cassette-type smear filter paper sampling device 1 to lightly attach the sampling head 11 to the surface to be measured. The cassette-type smear filter paper sampler 1 is moved back and forth so as to press and scrape the surface, that is, in the length direction of the smear filter paper sample tape 3 (about 100 cm ^{2 in accordance} with the method of JIS Z 4504). The radioactivity on the surface is wiped on the smear filter paper sample tape 3. The wiped smear filter paper sample tape 3 is a marker for identifying its position on the back side.
It is wound after being king and sealed so that radioactivity does not go out. When it is wound up, the next unused portion of the smear filter paper sample tape 3 arrives on the head 11, and the next sampling of another surface to be sampled is similarly performed. The above is how to use the cassette type smear filter paper sampling device 1 according to the present invention. The configuration of the embodiment of the cassette type smear filter paper sampling device 1 is as follows.
After the continuous smear filter paper sample tape 3 is sent in the form of a roll, the smear filter paper sample tape is sent out.
A cassette 2 having a winding roller 22 for winding the tape 3 and having a predetermined notch 23, and a state of being located in the notch 23 of the cassette 2 and protruding from the sample collecting device at the time of sampling. A head 11 for collecting, which can be withdrawn and withdrawn,
Seal tape 4 for sealing the sampled surface of smear filter paper sample tape 3 after sampling, and smear filter paper sample tape 3 and seal tape 4 after sampling are crimped The seal tape feeding roller 13 for sealing and the head 11 at the time of sampling are placed at a constant distance from the smear filter paper sample tape 1
And a winding device 15 for driving the winding roller 22 to wind up the smear filter paper sample tape 3 which has been sampled. In addition, the cassette type smear filter paper sampling device 1 has a notch portion corresponding to the lower surface of the notch portion 23 of the cassette 2, and the seal tape 4 is arranged in the cassette 2. This is a characteristic configuration. Further, the winding device 15 has a configuration characterized in that it can be either a manual type or an electric type. 1, 2,
4 is a manual type, and FIG. 5 is an electric type.

Further, in the embodiment of the cassette type smear filter paper sample collecting method of the present invention, the smear filter paper sample tape 3 is housed in the cassette 2, and the cassette 2 is mounted in the sample collecting device. Head 1 for Sampling Samples
The smear filter paper sample tape 3 is brought into contact with the head by projecting 1 out of the sampling device, and the movement of the smear filter paper sample tape 3 is locked.
The tape 3 is rubbed against the surface to be sampled, then the smear filter paper sample tape 3 is marked, and the seal tape 4 is adhered onto the sampled smear filter paper sample tape 3 and then placed in the cassette 2. The configuration is characterized by being wound up.

The structure of the cassette type smear filter paper sampling device 1 will be shown below to explain the detailed operation. FIG. 1 is a perspective conceptual view of a cassette type smear filter paper sampling device 1 of the present invention, showing a state with a lid removed. FIG. 2 is a conceptual view of the back side of the cassette type smear filter paper sampling device 1, and FIG. 3 shows a cassette 2 according to the present invention mounted in the cassette type smear filter paper sampling device 1. .

The sample tape mounted in the cassette 2 is a tape-shaped smear filter paper standardized by JIS Z 4504, which is wound on the feed roller 21 in a roll shape. Has been done. The sample tape sent from the feed roller 21
The inner left side of the cassette 2 (see FIG. 3)
(See) and then horizontally to the right and then to the upper right to be wound up on the winding roller 22.

Further, the smear filter paper sample tape 3 itself is displayed so that the start position and the END position can be discriminated from each other and the unused portion is displayed in red. It is easy to see the toe position and the END position. This is a cassette type smear filter paper sampler 1
Then, the smear filter paper sample tape 3 on the head 11 may be turned upside down. A seal tape 4 is provided in the cassette 2 so as to seal the sample collecting surface of the smear filter paper sample tape 3 which has been sampled. As a result, radioactive materials are peeled off from the sample tape 3 of sampled smear filter paper, thereby eliminating the risk of internal exposure of workers and recontamination of other areas and protecting the sample. Although the seal tape 4 is provided in the cassette as an example, the seal tape 4 does not necessarily have to be inside the cassette 2 and may be placed outside the cassette 2.

The cassette 2 also has a predetermined cutout 2
3 and has a head 1 which will be described later from the cutout 23.
1, marking device 12, seal tape feed roller 13
Access to the inside of the cassette 2.

As a method of mounting such a cassette 2 on the cassette type smear filter paper sampling device 1, a method similar to that of mounting an audio cassette tape on a cassette deck may be selected. That is, the cassette 2 feed roll
When the la 21 and the take-up roller 22 are fitted into the feed shaft 211 and the take-up shaft 221 of the cassette-type smear filter paper sampling device 1, respectively, the smear filter paper sample tape 3 in the notch 23 of the cassette 2 becomes The cassette type smear filter paper sampling device 1 comes under the head 11 at the tip. The head 11 projects downward when the sample is taken, but when the cassette is mounted, it is in the retracted position as shown in FIG. 1, so that the smear filter paper sample tape 3 is not obstructed by the head 11. After mounting the cassette 2, the head 11 is operated by operating a lever (not shown) so that the cassette-type smear filter paper sampler 1
Projects downward from. At this time, the smear filter paper sample tape 3 surely comes into contact with the head 11 and the movement of the smear filter paper sample tape 3 is also locked so that the sample can be collected. The method of sampling is described above.

After the sample is taken once, the lock is released by pressing the release button 14, the smear filter paper sample tape 3 can be moved, and the marking device is used to record the sampled position at that time. 12 operates to print black marks or punch holes on the back surface of the smear filter paper sample tape 3. Since the marking is always performed at a fixed distance from the corresponding sampling position on the smear filter paper sample tape 3, even if the feeding amount of the smear filter paper sample tape 3 is different, the sampling position is concerned. You can know exactly. Whether or not the marking device 12 functions normally can be confirmed from the peep holes (24 in FIG. 3) provided in the cassette type smear filter paper sampling device 1 and the cassette 2. ．

Further, when the smear filter paper sample tape 3 moves by pulling up the take-up lever 15, the smear filter paper sample tape 3 part which has been sampled is sealed by the seal tape 4. It is sealed on the tape feed roller 13. This prevents the radioactive material from peeling from the smear filter paper sample tape 3 and protects the sample. It is desirable that the seal tape 4 has a thin dead layer so as not to reduce the sensitivity when measuring radioactivity.

When the lock is released, the take-up lever 15 on the rear surface of the cassette type smear filter paper sampler 1 shown in FIG.
The winding operation is completed by pulling up. When the winding is completed, the movement of the smear filter paper sample tape 3 is locked, and the next sample can be collected. By repeating this, it is possible to sample about 40 points with one cassette 2. It is also possible to use a cassette that can collect more samples than that.

With the above apparatus, the smear filter paper preparation process, the filter paper replacement process at the time of sampling, and the sample adjustment process, which required much time and amount of work by the conventional Smear method, can be integrated and rationalized at the time of sampling. As a result, labor saving in manual work can be obtained, and the size and size are portable. Table 1
The results of comparison between the current working process of the conventional smear method and that of the cassette type smear filter paper sampling device of the present invention are shown in FIG. The circles are the areas where the functions are improved by the present invention.

[0020]

[Table 1]

The movement of the smear filter paper sample tape 3 is carried out by pulling up the take-up lever 15, but it is also possible to electrify it as shown in FIG. 5, the same parts as those in FIGS. 1 to 4 are designated by the same reference numerals. The drive motor 61 starts to rotate by pressing the drive button for sampling motor once (not shown), and the winding roller 2 starts rotating.
Rotate 2. When the smear filter paper sample tape 3 moves by a predetermined amount, it automatically stops. Optical sensor to control this
62 and an optical sensor amplifier 63 are used. In this case, by lowering the head 11, the seal tape 4 is pulled out, and the guide roller G ₁ and the seal tape feed roller 13 are drawn.
Then, the surface of the smear filter paper sample tape 3 is sealed on the seal tape feed roller 13.

When the sampling of a predetermined number of points is completed, the cassette 2 is detached from the cassette type smear filter paper sampling device 1 like an audio cassette in the same procedure as when the cassette 2 is mounted, and a new cassette 2 is newly installed. Is again attached to the cassette type smear filter paper sampling device 1 by the above-mentioned procedure.

Next, the method of measuring the radioactivity on the smear filter paper sample tape 3 collected by the cassette type smear filter paper sample collecting device 1 of the present invention will be described. FIG. 6 shows a basic block diagram of a cassette type smear filter sample measuring device 71 which is an automatic measuring device for radioactivity measurement.

FIG. 7 is a flow chart showing the operation of the cassette type smear filter sample measuring device 71 which is the automatic measuring device of FIG. The flow chart of FIG. 7 will be described with reference to the basic block diagram of FIG. (1) First, the cassette type smear filter sample measuring device 71, which is an automatic measuring device, is turned on. Since this device has a changeover switch for manual measurement and auto measurement, in this case, it is set to auto. (2) Insert the sampled cassette 2 into the cassette type smear filter sample measuring device 71. (3) Push the cassette 2 pressing door by hand and fix the door with the nail latch. (4) When the start button on the operation panel is pressed, the motor is driven and the smear filter paper sample tape 3 in the cassette 2 that has been sampled is fed from the winding roller 22 to the feeding roller 21. Rewind to. (5) When the position detection sensor-74 does not work for a certain period of time, it is determined that the rewinding is completed, the driving of the smear filter paper sample tape 3 is stopped, and a rewinding completion signal is output. (6) Smear filter paper sample tape 3 Upon receiving the rewinding completion signal, the eccentric cam is rotated and the smear filter paper sample tape 3 is pulled out from the cassette 2. (7) Smear filter paper sample tape 3 The motor is driven by the rewinding completion signal, and the smear filter paper sample tape 3 is wound up. (8) The black dots marked on the smear filter paper sample tape 3 are read by the position detection sensor 74, and the motor is stopped. When the position detection sensor-74 does not work for a certain period of time, the process proceeds to (14). As the position detection sensor 74, an optical sensor, an optical reader or the like can be applied. (9) With the stop signal of the smear filter paper sample tape 3, the scaler 73 measures the sampling surface of the predetermined smear filter paper sample tape 3 from above the seal tape 4. (10) The measurement is completed. (11) The number of the cassette 2 is read by, for example, a cassette number sensor (for example, bar code reader) 75. (12) The cassette 2 number, the point number, and the measured value are printed on the printer 77 and / or stored in the storage device 78. (13) After printing and / or storing in the storage device 78, the motor is driven to wind up the smear filter paper sample tape 3,
Move to (8). (14) If the position detection sensor 74 does not work for a certain period of time, it is judged that all the winding is completed, the motor is stopped, and the end is displayed. The above is the operation of the cassette-type smear filter paper sample measuring device 71 for one smear filter paper sample tape 3 cassette 2. Do the same for the second cassette 2 (1)
You can repeat from. In FIG. 7, a known cassette type automatic sample exchange device 79 for automatically exchanging a plurality of cassettes 2 is provided below the automatic measuring device 71. According to this, the cassette 2 can be automatically replaced.

FIG. 8 illustrates the cassette type smear filter paper sample collecting apparatus according to the present invention and the cassette type smear filter paper sample collecting method and measuring method as an example.

The upper dotted line frame is 1) a preliminary preparation step before going to the sampling site. The middle dotted frame is 2) the on-site sampling process. The lower dotted line frame is 3) an automatic measuring process of the sample smear filter paper sample tape 3. These will be described below.

1) Advance preparation step. (1) Prepare the cassette 2 according to the present invention. Prepare the required number of cassettes (about 40 points can be sampled per cassette) from the planned number of sampling points, and attach the serial number and its bar code to the cassette 2. (Cassette 2 with the number of points that can be sampled as required
Can be used. (2) Mount the cassette 2 to the device. The first cassette 2 is attached to the cassette type smear filter paper material collecting device 1. (3) Prepare a layout drawing of the sampling area. Prepare a layout of the planned sampling location (eg floor / wall of the sampling room).

2) Sampling step. (1) Sampling. A) Push down the head for sampling. As a result, the smear filter paper sample tape 3 is attached to the head 1 at the tip.
It contacts 1 and is locked. B) Sampling. The head 11 at the tip is rubbed against the sampled surface to attach the stain to the smear filter paper sample tape 3. C) Feeding of the smear filter paper sample tape 3 and marking of the sampling position. When the release button 14 is pressed, the smear filter paper sample tape 3 is marked so that the sampling position can be seen, and the lock is released so that the manual lever is raised, or the smear filter paper sample tape is electrically driven for a predetermined distance. Send a 3rd page. D) Record the cassette number and sample number in the above layout diagram. E) ・ Go to f) when all scheduled sampling is completed.・ If it is not finished yet, go to (a) b) if the sampling is less than 40 points. (B) If sampling exceeds 40 points (2) -a)
What. F) After performing only (2) -a) and b), go to 3). (2) Replacement of the sample cassette 2. A) Pushing up the head 11 at the tip for sampling. As a result, the contact with the smear filter paper sample tape 3 is released, and the cassette 2 is ready to be taken out. B) Take out the cassette 2. C) Install the new cassette 2 with the next number. D) Return to (1) -a). 3) Automatic measurement of the collected smear filter paper sample tape 3. (1) Insert and set the cassette 2 into the measuring instrument. (2) Measure and print out the result, and
Stored in storage device. (3) Go to (1) to replace cassette 2. If there is no more cassette 2 to replace, go to (4). (4) File and organize.

[0029]

As shown in Table 1, when the cassette-type smear filter paper sampling device and the cassette-type smear filter paper sampling method of the present invention are used, the working time and amount of work are large in the conventional smear method. The preparation process of smear filter paper, the replacement of smear filter paper at the time of sampling, the sample adjustment process are integrated at the time of sample collection,
By rationalization, labor saving of manual work can be obtained, and it becomes small and portable and safe. Correspondingly, labor can be saved at the time of measurement by making a smear filter paper sample tape into a cassette.

[Brief description of drawings]

FIG. 1 is a schematic front perspective view of an embodiment of a cassette-type smear filter paper sampling device of the present invention.

FIG. 2 is a schematic perspective view of the back side of the same.

FIG. 3 is an assembly explanatory view showing an embodiment of a cassette mounted in the cassette type smear filter paper sampling device of the present invention.

FIG. 4 is a schematic perspective view showing a usage state of the cassette type smear filter paper sampling device of the present invention.

FIG. 5 is a conceptual explanatory view showing a relationship between an electric cassette type smear filter paper sampling device of the present invention and a cassette.

FIG. 6 is a basic block diagram of an automatic measuring device for smear filter paper sample tapes sampled by the electric cassette type smear filter paper sample collecting device of the present invention.

FIG. 7 is a diagram showing a flow of the automatic operation.

FIG. 8 is an explanatory diagram showing an example of a method for collecting and measuring a cassette-type smear filter paper sample according to the present invention.

[Explanation of symbols]

1 ... Cassette type smear filter paper sampling device 2 ... Cassette 21 ... Feed roller 211 ... Feed shaft 22 ... Winding roller 221 ... Winding shaft 23 ... Notch 24 ... Peep hole for checking the function of the marking device 3 ... Smear filter paper material tape 4 ... Seal tape 11 ... Head 12 ... Marking device 13・ ・ ・ Seal tape feed roller 14 ・ ・ ・ Release button 15 ・ ・ ・ Winding lever 16 ・ ・ ・ Head pushing down door 17 ・ ・ ・ Cutout 61 ・ ・ ・ Driving mode 62 ... Optical sensor 63 ... Amplifier for optical sensor 71 ... Cassette type smear filter sample measuring device 72 ... Detector 73 ... Scaler 74 ... which is an automatic measuring device Position detection sensor-75 ... Cassette number sensor-76 ... Interface - scan 77 ... printer 78 ... storage device 79 ... a cassette-type automatic sample changer G ₁ ... Gaidoro - La

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Eiji Yoshimura 3-5 Kasumigaseki, Chiyoda-ku, Tokyo Toyo Engineering Co., Ltd. (72) Inventor Kisuke Nakajima 3-5-5 Kasumigaseki, Chiyoda-ku, Tokyo Toyo Engineering Co., Ltd. (72) Inventor Koichi Endo 3-5 Kasumigaseki, Chiyoda-ku, Tokyo Toyo Engineering Co., Ltd.

Claims (4)

[Claims] 1. A predetermined roll is provided with a feed roller for accommodating a continuous smear filter paper sample tape in a roll shape and a winding roller for winding the smear filter paper sample tape after being sent out. A cassette with a notch, a head at the tip of the cassette that is located in the notch of this cassette and that protrudes from the sampling device at the time of sampling, and a smear filter sample after sampling A seal tape for sealing the collected surface of the tape, and a tape feed roll for pressure-sealing the smear filter paper sample tape and the seal tape after sampling. -La, a marking device that is placed at a certain distance from the head at the time of sampling to clearly indicate the sample point on the smear filter paper sample tape, and the take-up roller is driven to obtain the sample. And a winding device for winding the smear filter paper sample tape of Cassette type smear filter paper sampling device with a notch corresponding to the lower surface of the notch. 2. The cassette type smear filter paper sampling device according to claim 1, wherein the seal tape is provided in the cassette. 3. The cassette-type smear filter paper sampling device according to claim 1, wherein the winding device is electrically operated. 4. A smear filter paper sample tape is housed in a cassette, the cassette is attached to a sampling device, and a head for sampling in the sampling device is projected outside the sampling device. The smear filter paper sample tape is brought into contact with the head, and the movement of the smear filter paper sample tape is locked, the smear filter paper sample tape is rubbed on the sample surface, and then the smear filter paper sample tape is attached to the smear filter paper sample tape. A cassette-type smear filter paper collecting method, characterized in that the tape is wound on a cassette after the seal tape is adhered on the collected smear filter paper sample tape by marking.