JPS61112984A - Apparatus for examination of radioactive contamination - Google Patents

Abstract

PURPOSE:To perform not only work safely in an extremely efficient manner but also accurate measurement, by automatically performing the sampling of a specimen by using a turntable, a lift mechanism, a specimen sampling mechanism and tape like filter paper and measuring radioactive contamination by a radioactive contamination detector. CONSTITUTION:Tape like filter paper 21 passes along the outer periphery of a filter paper pressing roller 47 to receive the adhesion of a thin roll tape 51 and passes through the slit part of a shield body 29 to be successively wound up. A shaking arm 17 revolves toward an article 1 to be examined and the filter paper material part of the tape like filter paper 21 is pressed to the top surface or side surface of the article 1 to be examined under definite pressure by the filter paper pressing roller 47. Subsequently, a turntable 2 is rotated to rub the surface of the article 1 to be examined with the filter paper material 23 under definite pressure. The rotary angle of the turntable 2 is set so that a wipe-off area at every measuring surface becomes constant. The quantity of the radioactive substance adhered to the tape like filter paper is detected by a contamination density detector 28 but reflection type photoelectric switch 26, 30 are opened and contamination at the wiped-off part is detected accurately.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for extracting a sample from the outer surface of an object to be inspected for radioactive contamination.

[Conventional technology]

In general, most of the radioactive waste generated at nuclear power generation facilities, etc. is reduced in volume by appropriate means depending on the nature of the waste, and is then packed into drums as assimilated waste, and is treated as radioactive solid waste. It is stored in a storage facility within the power generation facility.

When carrying out this storage, it is necessary to measure the surface contamination density in order to transport and manage the radioactive solid waste. Uni, the Ministry of Construction is Sumya (+;I
ff(!l1r) Holding paper a in your hand, rub the surface of the object to be measured with smear filter paper a''C'', wipe off the radioactive material adhering to the surface of the object to be measured, and then use the smear filter. A measuring instrument (usually G
M￥! etc.) to measure the surface contamination density.

Note that this measurement is performed at a plurality of locations on one object to be measured.

[Problems that the invention attempts to solve]

In such work, workers are forced to work close to radioactive solid waste, and even though the radiation level of each individual radioactive solid waste is low, the cumulative radiation exposure during long-term work is In some cases, this cannot be ignored, and from the perspective of reducing radiation exposure, it is desired to make the above measurements remote or automated.

The present invention aims to meet these requirements, by making it possible to safely and reliably collect a sample from the external surface of an object to be inspected, and to detect radioactive contamination from the collected sample itself. The purpose of the present invention is to provide a radioactive contamination testing device that can be used appropriately.

[Means for solving problems]

Therefore, the radioactive contamination inspection device of the present invention has a turntable on which an object to be inspected is placed, and a turntable that is -1-
It is equipped with an elevating mechanism for lowering, and a sample collection mechanism provided near the elevating mechanism, and the sample collection mechanism includes a rotational drive device, a rotating arm driven by the rotational drive device,
It is composed of a swinging arm that is pivotably supported at the tip of the rotating arm, and the rotating arm is equipped with a tape-shaped filter paper feeding device, a tape-shaped filter paper winding device, and a tape-shaped filter paper feeding mechanism. , a radioactive contamination tester and a rocking device for rocking the rocking arm are attached, and the rocking arm is equipped with a tape-shaped filter paper fixing device, a tape-shaped filter paper pressing roller, and a covering tape. It is characterized by being equipped with a feeding device, a covering tape pressure welding device, and a balance weight.

[Effect]

In the radioactive contamination inspection apparatus of the present invention described above, a sample is collected from an object to be inspected by the turntable, column descending structure, and sample collection mechanism using a tape-shaped filter paper provided in the sample collection mechanism. This is carried out automatically and continuously, and radioactive contamination is measured using a radioactive contamination tester equipped in the sample collection mechanism.

Further, after the sample is collected, the surface of the tape-shaped filter paper is covered with a covering tape and sent to a radioactive contamination tester.

Embodiment] Hereinafter, a radioactive contamination inspection device 6 as an embodiment of the present invention will be explained with reference to the drawings. FIG. 1 is a side view thereof;
Figure 12 is a plan view of the same, Figure 3 is a diagram of its top surface being wiped off, Figure vJ4 is a diagram of its bottom surface being wiped off, and Figure 5 (a).
(b) is a perspective view and an enlarged cross-sectional view of the tape-shaped filter paper [an enlarged cross-sectional view taken along the Vl-vb arrow in Fig. 5 (a)], Fig. 6 is a cross-sectional view of the contamination density detection part, and Fig. 7 The figure is an explanatory diagram showing the area to be wiped off.
(e) shows a modified example of the pressing roller and the idle roller, and FIG. (b) is an enlarged front view of the arm, and Fig. 8(c) shows the same pressing.
is an enlarged front view of the same guide roller, and FIG. 9 is a side view showing a modification of the tape-shaped filter paper feeding device.

As shown in FIGS. 1 and 2, a turntable 2 on which an object to be inspected 1 filled with assimilated radioactive waste is placed is rotatably supported by a pedestal 3. As shown in FIGS. An opening is provided in the center of the turntable 2, and a gear 2a is formed on the inner periphery of the opening.

The pedestal 3 that pivotally supports the turntable 2 has a guide rail 8
It is provided so that it can be raised and lowered along lines a and 8b, and an opening is also provided in its center.

Further, a turntable drive motor 4 is attached to the pedestal 3, and the rotational force of the motor 4 is transmitted to a gear 2a on the inner circumference of the turntable 2 via a pinion gear 5. can be rotated around a vertical axis.

Further, a rotation angle detector (not shown) is attached to the turntable drive motor 4, and the rotation angle of the turntable drive motor 4 is detected by this.

On the other hand, the cradle 7 has an idle rail 8a that guides the pedestal 3.
, 8b is installed, and this
In order to move the pedestal 3 up and down along the pedestals a and 8b, a ball screw 9 is rotatably supported on the pedestal 7 and is screwed onto the pedestal. 7. The pedestal 3 can be lowered by being rotated by a large lift drive motor 10 provided in the second part.

(1) The lowering drive motor 10 has a built-in rotation angle detector (not shown), which allows the pedestal 3 to be raised and lowered 4! position is detected.

This 4: sea urchin, pedestal 3. Guide rails 8a, 8b
, a ball screw 9 and a lift drive motor 10 constitute a lifting mechanism for lowering the turntable 2.

Next, a sample collection mechanism provided near the elevating mechanism connected to - will be described.

A support plate 1 is mounted on the pedestal 7 so as to face the object 1 to be inspected.
2 is fixedly installed, and a bearing 13a is fixedly installed on this support plate 12.
, 13b, the rotating shaft 14 is rotatably supported. One end of this rotary shaft 14 is connected to a rotary drive device 15 composed of a motor and a rotary rock. Further, a rotary arm 16 is attached to the other end of the rotary shaft 14, and the rotary arm 16 is rotatably driven around a horizontal axis by a rotary drive device 15 via the rotary shaft 14.

On the other hand, a swinging arm 17 is swingably supported at the tip of the rotating arm 16, and as shown in FIG. and the tip of a fluid pressure cylinder 19 whose one end is pivotally supported by the rotary arm 16 are rotatably connected. The swing arm 17 is made to swing by expanding and contracting the fluid pressure sill 19.

Note that a balance weight 20 suitable for the weight of the swing arm 17 is attached to the rod 18. The mounting position of this balance weight 20 can be adjusted in the axial direction of the rod 18.

Next, the tape-shaped filter paper 21 will be explained.

As shown in FIG. 5(a) and (+1), the tape-shaped filter paper 21 has a core material 22. as a filter support tape. It is composed of a filter paper material 23 as a sample collection filter paper and an auxiliary material 24.

The core material 22 is treated so that one side thereof has adhesive properties.
It is a tape-shaped material that has a tensile strength to obtain the necessary tension when fed to the tape-shaped filter paper 21, and its material is paper, vinyl, metal, etc. .

In addition, the filter paper material 23 is adhered to the adhesive surface of the core material 22 with a width narrower than that of the core material 22 and approximately in the center, and by pressing and rubbing this filter paper material against the surface of the object to be inspected 1 It is possible to wipe off radioactive substances attached to the surface of object 1.

The material is JISP3801. [Filter paper (for chemical analysis) No. 1, No. 004, No. 5 is suitable, but other materials such as cloth, leather, and appropriate chemical products may also be considered.

The auxiliary material 24 has approximately the same thickness as the filter paper material 23, and is spaced slightly wider than the width of the filter paper material 23 [111] on both left and right sides of the back side of the surface of the core material 22 to which the filter paper material 23 is adhered. It is glued. Possible materials include paper, rubber, and vinyl.

As in 1- below, the core material 22. [Paper material 23 and auxiliary material 2
4. The tape-shaped paper 21 can be wound into a roll. Also, tape-like tit
For the side of the paper 21 to which the auxiliary material 24 is glued, the auxiliary material 24
Alternatively, by marking an appropriate mark 25 on the core material 22 and detecting this mark 25 with a reflective photoelectric switch 26, the feeding position of the tape-shaped filter paper 21 can be detected.

The above-mentioned filter paper tape 21 is attached to a glue rule 27 as a tape filter paper feeding device rotatably supported by the rotary arm 16, as shown in FIG.

Furthermore, as shown in Fig. 3.4.6, the rotary arm 16 has a contamination density detector 2 as a radioactive contamination detector inside.
8 attached to the shield 29.1 Reflective charging switch for paper position detection 30. Filter paper feed motor 31. A reflective charging switch 32 for detecting the presence of filter paper and a filter paper winding motor 33 as a tape-shaped filter paper winding device are attached, and guide rollers 34, 35a, 35b, 36 .
Filter paper feed roller 37 as a tape filter paper feeding mechanism
A filter paper take-up reel 38 is rotatably supported.

The contamination density detector 28 counts the number of radiation emitted from the radioactive substances attached to the tape-shaped filter paper 21.
A GM tube or the like is usually used.

In order to improve the detection sensitivity of the contamination density detector 28 installed inside, the shield 29 shields one line from the outside.
(This is the L-th one that covers the breast. Also, this shield 29
is provided with a slit so that the tape-like filter paper 21 can pass along the detection surface of the contamination density detector 28.

The filter paper position detection reflective charging switch 30 detects the mark 25 marked on the back side of the tape filter paper 21, and detects the wiped portion of the tape filter paper 21 with the contamination density detector 28.
This is to stop the vehicle at a position opposite to the vehicle. As shown in FIG. 6, this is the distance r from the reflective charging switch 26 attached to the swinging arm 17 to the wiping part, and
This can be achieved by arranging the filters so that the distances W1i#E1' from the filter paper position detection reflective TV switch 30 to the contamination density detector 28 are equal.

) The filter paper feed motor 31 is for feeding the tape-shaped filter paper 21, and rotates a filter paper feed roller 37 attached to the output shaft of the filter paper feed motor 31. A 7-lead roller 42 is pressed against this filter paper feed roller 37, and the 717-roller 42 is pressed by a spring 4.
It is rotatably supported four times by a lever 41 which is biased by a force of 0. This prevents empty feeding of the tape-shaped filter paper 21 passing through the opening between the filter paper feed roller 37 and the seven-lead roller 42.

The reflective photoelectric switch 32 for detecting the presence of filter paper is used to detect the presence or absence of the tape-shaped filter paper 21 and to confirm whether the apparatus is operating normally.

The filter paper winding motor 33 is for applying rotational force to the filter paper winding reel 38, and sequentially winds up the used tape-shaped filter paper 21 on the m paper winding take-up reel 3B.

The guide rollers 34, 35a, 35t+, and 36 are all guides for maintaining the feeding path of the tape-shaped filter paper 21.

Ikki, rock! The JJ arm 17 has l shown in FIGS. 3 and 6.
Fluid pressure seal for fixing filter paper as a tape-like filter paper fixing device - 43, ID member 441 Reflective photoelectric switch 2
6. A reflective charging switch 45 for checking the supply of filter paper and a reflective light switch 46 for detecting thin film roll tape are installed, and a roller 47 is used to press the filter paper. 1 Lure for feeding out thin film roll tape as a covering tape feeding device 48. Bonding roller 4 as a covering tape pressure bonding device
9a, 49b and guide loaf 50a-50. ．． 5
2 is rotatably supported.

The fluid pressure cylinder 43 for fixing tti paper is extendable and retractable, and in a contracted state, there is a gap between the guide member 44 and the tape-shaped filter paper 21 passing through this gap, and in an extended state, a force is applied to the guide member 44. The tape-shaped filter paper 21 is sandwiched between the tape-shaped filter paper 21 and the tape-shaped filter paper 21 to be moved 11-times. For this reason,
As the material of the guide member 44, a comb material (for example, urethane rubber!!P) is used to prevent the tape-shaped filter paper 21 from slipping.

To press the filter paper, the roller 47 wraps its outer circumference in a tape-like manner w1 paper 2
1 is provided so that it passes through, and the hydraulic shilling-
When the filter paper 19 is extended and the swing arm 17 is rocked, the filter paper 21 is pressed against the surface of the object 1 to be inspected at the position of the roller 47.

'r# Membrane roll tape feeding reel 4.8 is for supporting a thin film roll tape 51 as a covering tape, and this thin film roll tape 51 is used to remove radioactive material attached to the filter paper material 23 of the tape-shaped filter paper 21. This covers the surface of the tape-shaped filter paper 21 to prevent substances from being dispersed elsewhere.

It should be noted that an extremely thin material is used for the thin film roll tape 51 so as not to reduce measurement accuracy when measuring the amount of radioactive substances attached to the filter paper material 23 later. One or both of the bonding rollers 49a and 49b rotatably supported by the swing arm 17 are covered with an elastic body on their outer peripheries, and a tape-shaped filter paper 21 and a thin film are connected between the bonding rollers 49a and 49b. The roll tape 51 passes through, - and 1:11, and both sides are pressed together,
The thin+IQ roll tape 51 is now adhered to the surface of the tape-shaped filter paper 21.

The idler roller 52 is rotatably supported by the central axis of the swinging arm 17, and since the tape-shaped filter paper 21 passes in contact with the idler roller 52, the swinging of the swinging arm 17 is prevented. 1: The length of the tape-like filter paper 21 hardly changes due to movement.

The idle rollers 50a to 50 (which are pivotally supported by the swing arm 17)
Reference numerals 18 and 52 are guides for maintaining the feeding path of the tape-shaped filter paper 21 or the thin film roll tape 51.

The reflective charging switch 26 is located on the back surface j of the tape-shaped filter paper 21,
: This is for detecting 11 lower mark 25.
l! 'The paper pressing roller 47 presses the filter paper material 23 against the surface of the object 1 to be inspected at a position separated by a distance r. In addition, as mentioned above, the contamination density detector 28 and the filter paper position detection reflection) 1 photoelectric switch 3
The distance l' from 0 is equal to e, and the pitch of the marks 25 marked on the back side of the tape-shaped filter paper 21 is also equal to l.

The reflective photoelectric switch 45 for filter paper supply confirmation is used to confirm that the tape-shaped filter paper 21 is being supplied normally, and the reflective charging switch 46 for thin film roll tape detection is for confirming that the thin film roll tape 51 is being supplied normally. This is to confirm that it is being supplied.

To explain the action of this book 8M to a dog, (1) The tape-shaped filter paper 21 and the thin-film roll tape 51 are pivoted on the setting reel 27, and the tape-shaped filter paper 21 is supported by the setting reel 27, passes through the guide roller 34, and is connected to the idle roller 50a. After passing between the idle roller 52 and reaching the swing arm 17 portion, it passes through the idle roller 50b and then passes in front of the reflective charging switch 45 for confirming filter paper supply. And the guide roller 5
0c, the filter paper fixing fluid pressure ring 43 and the opening of the id member 44, the filter paper is pressed through the outer periphery of the roller 47, and then the thin film roll tape 5 pivotally supported on the reel 48.
1, the thin film roll tape 5 is applied to the tape-shaped filter paper 21 by passing between the bonding rollers 4.9a and 491+.
1 is glued, then the idle rollers 50e and 5 (H
pass through.

The thin film roll tape 51 is unwound from the reel 48 and passes in front of the idle roller 50d and the reflective charging switch 46 for detecting the thin film roll tape before reaching the joining rollers 49a and 49b. After that, it passes between the idle roller 52 and the idle roller 50g while being adhered to the tape-shaped filter paper 21, and reaches the rotating arm 16.
Since the idle roller 52 is provided at the swing axis fulcrum of the swing arm 17, even when the swing arm 17 swings,
The change in the path of the tape-shaped filter paper 21 can be made by an amount of I.

Then, after the tape-shaped filter paper 21 passes in front of the reflective charging switch 30 for checking the filter paper position,
a, 351+, passes through the slit portion of the shield 29, and reaches the filter paper feed flow 237 section. At the filter paper feed roller 37 section, the lever 41 is moved by the action of the spring 40.
The filter paper feed motor 31 is operated to feed the filter paper to the filter paper. After passing through the filter paper feed roller 37, the tape-shaped filter paper 21 passes in front of a reflective photoelectric switch 32 for detecting the presence of filter paper, passes through an idle roller 36, and then passes through a filter paper take-up reel 38 rotated by a filter paper take-up motor 33. is wound up sequentially.

(2) Wiping the surface of the object 1 to be inspected When cleaning the surface of the object 1 to be inspected, first, move the swinging arm 17 to the state shown by the imaginary line in FIG. 19 is operated in the direction of contracting the filter paper, and the roller 47 is moved away from the surface of the object 1 to be inspected.

Next, the filter paper feeding motor 31 is activated to feed the tape-shaped filter paper 21, and when the reflection type Biden switch 26 detects the marker 225 marked on the tape-shaped filter paper 21,
The feeding of the tape-shaped filter paper 21 is stopped (1-). Then, the fluid pressure cylinder 43 for fixing the filter paper is operated in the direction of stretching,
The tape-shaped filter paper 21 is sandwiched and fixed between the fluid pressure sill 43 and the id member 44.

In this state, if the fluid pressure cylinder 19 is operated and the swing arm 17 continues to rotate in the direction of the object to be inspected 1, the third
As shown by the solid line in the figure, the filter paper material 23 of the tape-shaped filter paper 21
The filter paper is continuously pressed against the top surface of the object 1 to be inspected 1 by the roller 47 at a constant pressure.

Next, when the turntable drive motor 4 is activated and the turntable 2 is rotated, the object 1 to be inspected rotates, so the top surface - L surface of the object 1 to be inspected is held at a constant pressure by the paper material 23. It means you've rubbed it off.

After wiping a certain area of the top surface of the object to be inspected 1, the turntable drive motor 4 is stopped 1- and the turntable rotation is 11 degrees to reduce the fluid pressure 19 degrees.
The swinging arm 17 is moved in the direction away from the surface of the object to be inspected 1 to return to the state shown by the imaginary line in FIG. to release the tape-like filter paper. Then, the filter paper feed motor 31 is operated, and the tape-shaped filter paper 21 is
to the next mark 2 marked on the tape-shaped filter paper 21.
5 is detected by the reflective charging switch 26, the feeding of the tape-shaped filter paper 21 is stopped.

At this time, the filter paper material 23 of the tape-shaped filter paper 21 is
Joining rollers 49a, 49
Since the thin film roll tape 51 is adhered by b, the contaminants attached to the filter paper material 23 will not spread to other parts.

(3) After wiping the side surface of the object 1 to be inspected and wiping the top surface of the object 1 to be inspected, the rotation drive device 15 is operated, and the H-rotation arm 16 is moved to the rotation shaft 14.
Rotate around the tA2 diagram as shown by imaginary line (7
It is in a busy state and stops. After 1 and -, (2) A (the theory is 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, and 19), the sides are wiped off.

At this time, the turntable drive motor 4 is operated,
The turntable 2 is rotated and the side surface of the object 1 to be inspected is rubbed with a filter paper material 23 at a constant pressure.

By performing the same operation while appropriately changing the height of the pedestal 3 (☆16) by operating the lowering drive motor 10,
It becomes possible to wipe any position on all sides of the object to be inspected 1.

(4) Wiping the bottom surface of the object 1 to be inspected After wiping the side surface of the object 1 to be inspected is completed, operate the lift drive motor 10 to raise the height of the pedestal 3 to the maximum level.
Raise by 1 to 1 point.

In this state, the rotation drive device 15 is operated to rotate the rotation arm 1.
6 is rotated around the rotation axis 14 and stopped in a vertical position as shown in FIG.

Thereafter, the bottom surface can be wiped off by performing the operations described in section (2).

(5) Effect of limiting the wiped area The wipe-type surface contamination density measuring means measures the total amount of radioactivity in the wiped area and converts it to the contamination density per 1 cn+2. need to know.

Generally, one sheet of smear paper is about 1000I112
I try to wipe it off.

In the device of the present invention, when the turntable 2 is continuously rotated with the tape-shaped filter paper 21 being pressed, the wiping area is cylindrical with the width of the filter paper material 23 in the case of the side surface, and in the case of the top surface and the bottom surface. In this case, it becomes annular with the width of the filter paper material 23,
The outside area will change. Therefore, when converting to the contamination density per 1 cm2, it is necessary to change the wiping area for each wiping location. Since wiping is performed by rotating the turntable 2, the rotation angle of the turntable 2 is detected by an H rotation angle detector (not shown), and the wiping I is performed for each measurement surface.
If the rotation angle is determined so that the O2 concentration is constant, then it is possible.

That is, as shown in FIG. 7, the wiping area can be arbitrarily set by rotating the inspected object 1 within the range of angle .theta.1 for the bottom and top surfaces and within the range of angle .theta.2 for the side surfaces.

(6) Detection of measurement location In the device of the present invention, a tape-shaped filter paper is used to detect the measurement location.
By wiping the surface of the filter paper, radioactive substances are attached to the tape-shaped filter paper, and the attached part is sent to the installation location of the contamination density detector 28 to detect the amount of attached radioactive substances. It is necessary to know the part of the tape-shaped filter paper where the radioactive substance is attached.

In this device, a mark 2 marked on the back side of the tape-shaped filter paper 21 is used.
5 using the reflective photoelectric switch 26, 30, the position of the tape-shaped filter paper 21 can be detected. That is, to explain with reference to FIG. 6, when performing the wiping operation, the tape-shaped filter paper 21 is fed and the reflective photoelectric switch 26 moves the mark 2 marked on the back side of the tape-shaped filter paper 21.
When 5 is detected, the feed is stopped. At this time, the distance from the reflective photoelectric switch 26 to the wiped portion is ρ.

Next, when detecting the wiped part, use tape-shaped filter paper 2
1, and when the reflective charging switch 30 detects the mark 25 on the back side of the tape-shaped filter #v21, the feeding is stopped.

At this time, the distance from the reflective photoelectric switch 30 for confirming the filter paper position to the contamination density detector 28 is l'. In this device, the distance ρ from the reflective charging switch 26 to the wiping part is equal to the distance Hp' from the reflective photoelectric switch 30 for filter paper position confirmation to the contamination density detector 28. It is possible to accurately detect contamination at the wiped area.

Note that the mark 25 marked on the back side of the tape-shaped filter paper 21 is
As a bar food with various kinds of information, the reflective photoelectric switch is replaced with a bar food reader.
2 and 1 magnetic tape. -B, -magnetic tape (,24
It is also possible to manually send the /f report to 111 (.).

(7) Effect of keeping the pressing force constant during wiping In the wiping type surface contamination density measuring means, since the contamination density is determined from the total radioactivity that has been wiped off, it is necessary to keep the wiping efficiency constant.

The wiping efficiency depends on the material of the filter paper and the test object.

The wiping speed and the pressure applied during wiping depend on the force, so it is necessary to keep these constant.

In the device 6 of the present invention, in order to keep the pressing force constant especially during wiping, the swing arm 17 and the swing arm 17
A balance weight 20 corresponding to the total weight of the parts attached to the swing arm 17 is provided on a rod 18 mounted at a position facing the swing arm 17 with the swing center of the swing arm 17 as a fulcrum. The weight of the entire swing arm 17 is balanced by this balance weight 20.

This is because the weight of the entire swinging arm 17 acts in opposite directions when wiping off the top surface and when wiping the bottom surface of the object 1 to be inspected, and the force on the push button 24 during wiping changes. This is to avoid doing so.

Note that the weight of the thin film roll tape 51 changes as it is used (7ti) from its initial state, but this value is small and does not pose a problem.

Further, the mounting position of the balance weight 20 is movable in the axial direction with respect to the rod 18, and can be finely adjusted.

By the way, a modification of the pressing roller 47 will be explained with reference to FIGS. 8(a) to 8(c).

Since an elastic body such as urethane rubber is usually used for the pressing roller 47, when it is pressed against the surface of the object to be inspected 1, the pressing roller 47 deforms to some extent. At this time, if the filter paper material 23 is thin, the core +422, which is the rubbing surface on the left side i of the filter paper material 23, touches the surface of the object to be inspected 1, and t
1. Place the IJ dyeing material on the surface of the object to be inspected. 4. It may also make it impossible to wipe off properly and smoothly.

Therefore, as shown in FIGS. 8(,) to (c), the pushing roller 47 is connected to the central bulge-shaped roller 12.
, a recessed roller 52a at the center on the left and right sides thereof.

5211 may be set so that the core material 22 does not come into contact with the surface of the object 1 to be inspected.

Note that the rollers 52a and 52b having a concave shape at the center are provided along the path K between the center and end portions of the tape-shaped filter paper 21.
This is to prevent the tape-shaped filter paper 21 from being undesirably deformed.

Next, a modified example of a tape-shaped filter paper and its feeding device will be explained with reference to FIG.

The tape-shaped filter paper 21 of this embodiment has a core material 22. It is composed of a lji paper material 23 and an auxiliary material 24, and is attached to a reel 27, but as shown in FIG. ．． l
f attached to the paper material reel 54, and bonding rollers 55a, 55
They may be joined at b and then fed out to the swinging arm via 71. In this way), the auxiliary material 24 becomes unnecessary.

〔Effect of the invention〕

As detailed in 1j--, the radioactive contamination inspection apparatus of the present invention includes a turntable on which an object to be inspected is placed, an elevating mechanism for lowering the turntable by 1, and an elevating mechanism for lowering the turntable. a sample collection mechanism provided near the rotary drive device, a rotary arm driven by the rotary drive device, and a rotary arm pivotably supported at the tip of the rotary arm. The rotary arm is equipped with a tape-like filter paper feeding device, a tape-like filter paper winding device, a tape-like filter paper feeding mechanism, a radioactive contamination tester, and a swinging arm. A swing device for swinging the arm is attached, and the swing arm is provided with a tape-shaped filter paper fixing device, a tape-shaped filter paper pusher, and a roller.
With a compact structure equipped with a covering tape feeding device, a covering tape pressing device, and a balance weight, the following effects and advantages can be obtained.

(a) Even without the operator getting close to the object to be inspected, the sides and bottom of the object to be inspected can be wiped, making it possible to automatically and continuously measure the surface contamination density. The radiation exposure of workers can be reduced, and work can be done extremely efficiently.

(11) Tape-like paper) The paper is made up of a filter paper supported by a core material and an auxiliary material, and is also provided with a covering tape that covers the filter paper, so that only the filter paper comes into contact with the object to be inspected. While preventing radioactive substances from adhering to anything other than the filter paper, it becomes possible to wind and shape the tape-shaped filter paper.

(c) The balance weight maintains a constant force against the object to be inspected during wiping with the tape-shaped filter paper, so the wiping efficiency remains constant and accurate measurements can be made.

[Brief explanation of drawings]

Figures 1 to 9 show a radioactive contamination inspection device as an embodiment of the present invention. Figure 1 is a side view, Figure @2 is a plan view, and Figure #S3 is a diagram of the top surface wiped off. , FIG. 4 is a diagram of the bottom surface removed, and FIGS. 5(n) and 5(b) are a perspective view 19 and an enlarged cross-sectional view of the tape-shaped filter paper [viewed from the vb-vb arrow in FIG. 5(a)]. Enlarged cross-sectional views 1 and 6 are cross-sectional views of the contamination density detection section, and FIG. 7 is an explanatory view showing the wiping area. This shows a modified example of the idle roller, and FIG. 8(a) is a sectional view of a swinging arm equipped with a roller and an idle roller, and FIG. 8(b) is an enlarged front view of the arm. , FIG. 8(c) is an enlarged front view of the same idle roller, FIG. 9 is a side view showing a modified example of the tape-shaped filter paper feeding device, and FIG. 10 is a conventional radioactive filter using smear filter paper. It is an explanatory view showing a contamination inspection means. 1...Object to be inspected, 2...Turntable, 2a...Gear, 3...Base, 4...Turntable drive motor, 5...
- Pinion gear, 7... Frame, 8a. 8b... Guide rail, 9... Ball screw, 10... Lifting drive motor, 12... Support plate, 13a, 13b... Bearing, 14... Rotating shaft, 15... Rotating drive device, 16...
Rotating arm, 17... Swinging arm, 18... Rod, 1
9...Fluid pressure cylinder, 20...Balance weight,
21... Tape filter paper, 22... Core material, 23... Filter paper material, 24... Auxiliary material, 25... Mark, 26... Reflective charging switch, ? 7. Reel as a tape-like paper feeding device, 28. Contamination density detector as a radioactive contamination tester, 2. Shielding body, 30. Reflective photoelectric switch for confirming filter paper position, 31.・Tape-shaped filter paper feeding lPi structure and 1. ) Paper feed motor, 32... Reflective charging switch for filter paper presence detection, 33... Filter paper winding motor as tape-shaped filter paper winding device r6, 34, 35
a, 35+1, 36...Guide roller, 37...Filter paper feed roller, 38...Filter paper take-up reel, 40...
Spring, 41...Lever, /12...717-Roller, 4
3...Fluid pressure cylinder for fixing filter paper as a tape-shaped filter paper fixing device, 44...Guide member, 45...Reflective charging switch for confirming filter paper supply, 46...Reflective bar 1L power switch for detecting thin film roll tape , 47... A roller for pressing the filter paper, 48... A reel for feeding out a thin film roll tape as a covering tape feeding device, 49a. 4911...Joining roller as a covering tape pressure welding device,
50a to 50g...Guide roller, 51...Thin film roll tape as a covering tape, 52.52a. 521)...Guide roller, 53...Reel for core],
54... Reel for filter paper material, 55a, 55b... Joining rollers. Sub-Agent Patent Attorney Yoshi Iinuma 4 Figure 1 Figure 2 r"-11] Figure 8 (b) (C) Figure 9 Figure 109

Claims (1)

[Claims] A turntable on which an object to be inspected is placed, an elevating mechanism for raising and lowering the turntable, and a sample collection mechanism provided near the elevating mechanism, the sample collection mechanism including a rotation drive device, It is composed of a rotary arm driven by the rotary drive device, and a swinging arm that is swingably supported at the tip of the rotary arm. A winding device, a tape filter paper feeding mechanism, a radioactive contamination tester, and a swinging device for swinging the swinging arm are attached, and a tape filter paper fixing device is attached to the swinging arm, A radioactive contamination inspection device characterized by being equipped with a tape-shaped filter paper pressing roller, a covered tape feeding device, a covered tape pressing device, and a balance weight.