JPH02285279A - Smear apparatus of radioactive waste drum, radioactive intensity measuring apparatus and inspection installation equipped with both apparatuses - Google Patents

Abstract

PURPOSE:To reduce the exposure of a worker and to enhance working efficiency by recovering the smear filter paper used in the wiping-off of the contaminant on the surface of a drum and inspecting the surface contamination density of the drum in a full-automatic manner. CONSTITUTION:A radioactive waste drum 1 is placed on a drum support apparatus to be rotated in the peripheral direction thereof. A smear head 56 is relatively moved in the axial direction of the drum 1 in a side surface wiping-off smear apparatus to smear the side surface of the drum 1 and, in respective upper and under surface wiping-off smear apparatuses, smear heads 56 are relatively moved in the diameter direction of the drum 1 to smear the upper and under surfaces of the drum 1. When smear work is completed, smear filter paper having contaminant collected thereby is recovered by a filter paper recovery apparatus to be sent to a contamination density measuring apparatus and new filter paper is supplied to the smear head by a filter paper supply apparatus. The supply and separation of the filter paper are simply performed by the suction and discharge of air and the inspection control of the drum is efficiently performed to make it possible to reduce the exposure of a worker.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a method for inspecting the soundness of a radioactive waste drum by measuring smear of surface contamination, measuring the surface dose rate, and measuring the amount of radioactivity contained in the drum. Related to equipment and facilities for

[Prior Art] Radioactive waste generated during the operation of nuclear power plants and the like is solidified with cement or the like in drums (generally 200Q drums). When such radioactive waste drums are subjected to final disposal, it is necessary to check the amount of radioactivity (or radioactivity concentration) contained in each nuclide in each drum and the presence or absence of surface contamination. This is because the amount of radioactivity (or radioactivity concentration) that can be disposed of at the final disposal site is specified for each nuclide, so it is necessary to specify the amount of radioactivity (or radioactivity concentration) of each nuclide contained in each waste drum. In addition, when transporting drums filled with waste, it is necessary that the surface of the drums is not contaminated with radioactive materials, and the surface contamination of the drums must be measured and confirmed before being transported off-site. This is because it is necessary.

It is difficult to estimate the amount of radioactivity for each radionuclide contained inside from the surface dose rate of solidified waste-filled drums. Currently, as a method for estimating the radioactivity amount of contained radionuclides, the radioactivity concentration (or radioactivity amount) of Go-60 and Cs-137 is measured, and the concentration of other radionuclides is calculated based on these Go-60, Cs-137. A method has been proposed for estimating from the abundance ratio (this should be investigated in advance). This is because only γ-rays can be measured from the surface of solidified radioactive waste drums (β-rays and γ-rays are shielded by the drum or solidification material and cannot be detected from the surface of the drum). As Co-60°C5-
137 was taken into consideration.

The surface dose rate is determined by the concentration of radioactivity contained in assimilates and waste materials.
This is obtained as a result of shielding of solidified material, and the shielding performance (specific gravity) of waste and assimilated materials is the same even if the concentration of radioactivity contained in ricin is the same.
It depends. Therefore, in order to know the radioactivity concentration contained, a measurement method is required that adds information on the specific gravity of the solidified body to information on the surface dose rate. This type of measurement method takes advantage of the fact that when gamma rays transmit through a substance, Compton scattering occurs and the spectrum of the gamma ray is distorted, and information on the density of the transmitting substance is extracted from the amount of distortion in this spectrum. A method for correcting the attenuation effect due to shielding (spectral correction method) has been proposed.

On the other hand, the smear method is widely used as a method for confirming the presence or absence of surface contamination. This method measures the radioactive contamination density (μCi/a#) on the surface of the drum by rubbing the surface of the drum with smear filter paper and fixing the amount of radioactivity on the filter paper.

As a conventional technique related to the smear method, a method using a tape-shaped smear filter paper (Japanese Patent Application Laid-open No. 143707-1983;
-126381), one that uses a smear pad provided on a radial arm (Japanese Patent Application Laid-Open No. 62-888), and one that fits a circular smear filter paper into a smear head and heats a fixing ring to fuse it to the smear head (Japanese Patent Application Laid-Open No. 62-1988). 1843
83) etc. have been proposed.

[The issue that the issue is trying to solve] To provide disposal of radioactive waste drums.

It is necessary to confirm the presence or absence of surface contamination and measure the amount of radioactivity contained in each nuclide (radioactivity concentration), but with conventional technology, some of these tasks are performed manually by a single worker. Due to the proximity to drums filled with radioactive waste, there is a risk of high radiation exposure. Further, when the number of drums to be measured and inspected is large, high work efficiency cannot be obtained with conventional equipment.

An object of the present invention is to provide an automatic radioactive waste drum detection device that enables remote automation of the above-mentioned work, reduces radiation exposure to workers, and significantly improves the efficiency of one work.

[Means for Solving the Problems] The gist of the present invention for achieving the above object is as set forth in each claim.

[Function] In the smearing device for wiping the side surface of a drum according to the present invention, the smear head moves relative to the circumferentially rotating drum in the axial direction of the drum to perform side smearing, and also has a smear head for wiping the top surface and a bottom surface. In each smear device, a smear head moves in the diametrical direction of the drum to smear the upper and lower surfaces of the drum, respectively.

In the smear head of the present invention, when the case cavity on the back side of the breathable porous pad is evacuated, air is sucked through the pad, thereby suctioning and holding the smear filter paper on the pad surface, and conversely drawing air into the case cavity. When supplied, air flows out through the pad, causing the smear filter paper to separate and be discharged from the pad.

In the smear filter paper supply device of the present invention, the stacked smear filter papers in the cylindrical cartridge are pushed by a pusher plate, and the pad of the smear head is brought into contact with the outermost filter paper, thereby sucking the filter paper into the smear head. . In the smear filter paper collection device of the present invention, the smear filter paper is discharged from the pad of the smear head brought to the opening and collected into a tray that is stopped at an opening midway through a tubular passage and is waiting. This tray is transported to a radiation detection device for measuring surface contamination.

When the surface of the drum can is smeared by each of the above-mentioned smear devices, the smear heads are separated from the drum.
The filter paper is sequentially brought to the smear filter paper collection device and the smear filter paper supply device, and smeared filter paper is discharged and new filter paper is sucked and held.

At this time, the orientation of the smear head is changed to a direction suitable for this filter paper replacement work. During this time, the drum on the drum support device is replaced with the next drum.

In the device for measuring the amount of radioactivity contained in the drum, the drum is rotated in the circumferential direction and raised and lowered in steps in the axial direction, and the amount of radioactivity of each type of liquid contained in the drum is measured by a known method using the output of the gamma ray detector. but.

In this case, depending on the separately measured drum surface dose rate,
By selecting multiple distances between the gamma ray detector and the drum and simultaneously setting the collimator window accordingly, the amount of radioactivity contained can be accurately measured regardless of the magnitude of the surface dose rate.

In the drum can inspection equipment according to claim 9 of the present invention, one station of the drum conveyor performs the smearing operations on the side, top, and bottom surfaces of the drum as described above, and another station performs the smearing operation as described above to radiate the content of the drum. Measure the capacity. Against this.

In the drum inspection equipment according to claim 10, all of the above-mentioned operations are performed at one station of the drum conveyor.

[Implementation example] An embodiment of the present invention will be described below.

The drum inspection equipment of this embodiment includes a drum support device on which a radioactive waste gas drum is placed and rotated in the circumferential direction or raised and lowered in the vertical direction, and a drum transfer device that carries the drum into and out of the drum support device. A smear filter paper is pressed against the outer surface of the drum that is placed on the apparatus and the drum support device and rotates in the circumferential direction, and is moved along the outer surface of the drum to collect (wipe off) contaminants on the outer surface of the drum. A smear device, a filter paper recovery device that collects the smear filter paper that has been wiped off, a contamination density measuring device that measures the contamination density of contaminants collected by the smear filter paper, and supplies new smear filter paper to the smear device. a filter paper feeding device placed on the drum support device, a device for measuring the amount of contained nuclide radioactivity equipped with a gamma ray detector facing the drum placed on the drum support device; It consists of a surface dose measuring device that measures the drum surface dose rate using a detector that moves along the surface in the axial direction of the drum and a detector that is fixed at a position 1 m from the drum.

First, the drum support device will be explained with reference to FIG. 1. Figure (a) is a plan view, and figure (b) is an elevational view. This drum support device (the whole is indicated by the reference numeral 2) supports the drum 1 with three rollers: two guided idle rollers 21 and one guided drive roller 22. Reference numeral 22 is a driving device [23] which rotates the drum 1 at a constant speed in the circumferential direction. The drum holder 24 on which these rollers and the drive device 23 are installed can be raised and lowered by a ball screw 25 operated by the drive device 26. still,
Regarding the rise of the drum, it rises continuously during side smearing, and rises in steps when measuring the amount of contained nuclide radioactivity.

Next, the drum transfer device will be explained with reference to FIG. 2. The drum transfer device (whole number 3) is
The drum 1 is loaded into and taken out from the drum support device 2, and a movable cart 31 is capable of reciprocating at a constant speed on two rails 32a and 32b. Mobile trolley 3
1 is adapted to move by driving wheels 34 operated by a traveling drive device 33, and anti-float wheels 35 are attached to prevent the wheels 34 from floating off the rails. Further, a lifting device 36 is installed on the moving cart 31, and an openable/closable drum holding section 37 at the end holds the drum 1, and is lifted and lowered when a person carries out the drum from the drum conveyor to the drum supporting device 2. The structure is as follows.

Next, the smear device will be explained with reference to FIGS. 3 to 5. Figure 3 shows a smear device 5 for wiping the side surface.
An arm holding stand 58 to which one end of the arm 53a is hinged is rotatably hinged 57' to an arm moving stand 57, and this arm moving stand 57 is operated by a drive device 51. 2, which is the ball screw 52a
It is held by book rails 52a and 52b, and can be raised and lowered by a drive device 51. Arm 53 connected to arm 53a via air actuator 55
A smear head 56 is attached to the tip of b, and an air actuator 55 rotates the arm 53b (therefore, the head 56) by 90 degrees relative to the arm 53a so that the smear filter paper can be easily attached to and removed from the head 56. It has become. A push spring mechanism 54 that presses the arm 53a toward the arm holder 58 is provided on the arm holder 58, thereby making it possible to press the smear head 56 against the side surface of the drum 1 with a constant pressure. ing.

This smearing device is installed near the drum support device 2 described above, and while the drum support device 2 rotates the drum in the circumferential direction and moves the arm moving table 57 up and down,
The smear head 56 holding the smear filter paper is pressed against the side surface of the drum 1 as described above to wipe off surface contaminants. Note that the hinge portion 5 is moved by an actuator (not shown).
7' as the center, the arm holding base 58 is moved to the arm moving base 57.
It can be rotated outward relative to the

Next, a smear device for wiping the top surface is shown in FIG. Third
Structural parts similar to those in the figures are designated by the same reference numerals.

However, this top surface wiping smear device does not have an actuator 55, and an arm moving table 57 is supported on the top surface of a base 59 so as to be moved in the horizontal direction as shown by an arrow by a drive device (not shown). This smear device for wiping the top surface is also installed near the drum can device, and the arm 53a attached to the arm holder 58 is
It is pressed with a constant pressure by a pressing spring mechanism 54, and presses the smear head 56 attached to its tip against the upper surface of the drum can 1. The smear head 56 is pressed against the center of the drum rotating in the circumferential direction on the drum support device 2, and smeared continuously from there toward the end of the drum 1 by rightward movement of the arm moving table 57.

Next, the smear device for wiping the bottom surface is shown in Figure 5.
Structural parts similar to those in the figures are designated by the same reference numerals.

In this device, the arm moving table 57 is supported on the lower surface of the base 60 so as to be moved in the horizontal direction as indicated by the arrow in the figure by a drive device (not shown). This smear device for wiping the bottom surface is also located near the drum support device 2 mentioned above,
Drum 1 rotated in the circumferential direction on drum support device 2
By pressing the smear head 56 against the center of the lower surface of the drum can by means of the spring mechanism 54 (at this time, the arm 53b is located between the rollers 21 and 22) and moving the arm moving table 57 horizontally to the right, the lower surface of the drum can 1 is pressed. Smear.

After smearing the bottom surface of the drum 1 from the center to the edge, the drum rim 11 is also smeared (at this time, the arm holding table 58 is rotated slightly downward with respect to the arm moving table 57), and supplying smear filter paper to the head 56;
The air actuator 55 is configured to rotate the arm 53b (and thus the head 56) by 180 degrees for easy ejection.

Next, a filter paper supply device 8 for supplying new filter paper to the smear head 56 is shown as a sectional view in FIG. As shown in the figure, a cylindrical filter paper cartridge 8 stores a large number of filter papers 4.
1 is installed in the cartridge 81, and a push-up plate 82 is provided inside the cartridge 81, which can be raised and lowered by air introduced from an air supply pipe 84. The push-up plate 82 pushes up the filter paper by air, and the smear head 5 moves one sheet of filter paper at a time from the topmost filter paper.
Supply to 6. Incidentally, an exhaust port 83 is provided in the cartridge 81 in order to keep the push-up pressure constant. The uppermost filter paper is held by the smear head 56 by the suction force of the smear head 56. The smear head 56 includes a cup-shaped case 56d and an air-permeable porous pad 56a, and connects an intake/exhaust port 56c provided in the case 56 to a blower to exhaust the inside of the case 56d. Outside air is sucked into the case 56d through the pad 56d, thereby sucking and holding the uppermost filter paper to the pad 56a. As described above, since the filter paper is held by suction, the pad 56a is made of a material with good air permeability, the smear filter paper 4 is made of a material with poor air permeability, and the wire mesh 56b is used to press down the pad 56a.

FIG. 7 shows a filter paper recovery device for recovering smeared filter paper from a smear head. A recovery port 65 is provided in a tube 64 surrounding a roller conveyor 63. The smear head 56 holding the smear filter paper 4 after wiping the drum is brought to the collection port 65, and when air is sent to the smear head 56 by a compressor from the intake/exhaust port 56c, the filter paper 4 is separated from the pad 56a of the smear head.

The separated filter paper is placed on a roller conveyor 63 by a stopper 6.
Then, the stopper 61 is removed, and the tray 62 is sent all the way down a pre-sloped path to a contamination density measuring device g1 (not shown).

FIG. 8 shows the intake and exhaust system to the smear head 56.
When suctioning and holding smear filter paper, the suction/exhaust port 56c is connected to a blower.
The switching valve is controlled so as to be connected to the compressor when the smear filter paper is separated and collected.

The arm movement for supplying and discharging filter paper of the smear device for wiping the side surface (FIG. 3) is shown in FIG. 9. The side surface of the drum can 1 is wiped at the angular position shown in FIG. At this point, the head 56 is brought to the collection port 65 of the filter paper collection device 9, and the filter paper is discharged from the head 56.
At the angular position C), the head 56 is brought to the filter paper supply device 8, and new filter paper is supplied and held under suction. Furthermore, (a
When moving from position ) to position (b), the air actuator 55 rotates the head 56 by 90 degrees so that it faces downward so that filter paper can be easily supplied and discharged.

Smear device i for wiping the top surface! ! The arm movement for supplying and discharging the filter paper in (Figure 4) is shown in Figure 10 (G).
Wipe the top surface of the drum can 1 at the angular position (
At the angular position b), the filter paper is discharged from the head 56 and the filter paper is supplied to the head 56. In the position shown in (b), the head 56 is connected to the collection port 65 of the filter paper collection device 9. And filter paper supply equipment! Arm moving table 57 to be brought to 18
is horizontally moved and positioned along the base 59.

FIG. 11 shows the arm movement for supplying and discharging filter paper of the smear device for wiping the bottom surface (FIG. 5). The bottom surface of the drum is wiped off at the angular position shown in FIG. The filter paper is discharged from the head 56 at the angular position of (c) and the head 5
6. Supply filter paper to 6. At this time, the head 56 is operated by an air actuator to facilitate supply and discharge of filter paper.
Rotate it 180 degrees and point it downward. In addition, in the position (C), the arm moving stage 57 is moved so as to bring the head S6 to the collection port 65 of the filter paper collection device 9 and then to the filter paper supply device 8.
is horizontally moved and positioned along the base 60.

As described above, in this example, a total of three smear filter papers (one smear filter paper each for wiping the side, top, and bottom surfaces of one drum) are used to remove surface contamination from the drum. The loading of the drum into the drum support device 2 by the drum transfer device 3 and the removal of the drum from the drum support device 2 are carried out as described above for the side, top and bottom smear devices. This shall be done during the smear filter paper discharge and supply process.

Next, the apparatus for measuring the amount of radioactivity of contained nuclide will be explained with reference to FIG. This device for measuring the amount of nuclide radioactivity contained is the first
It has the structure shown in FIG. 2, and the drum support device 222 described above is
The drum 1 is installed near the drum support device! raised in steps by 12,
At each step, gamma rays from the drum are measured to measure the amount of radioactivity (or radioactivity concentration) contained in each nuclide. (The drum can is placed on the right side in FIGS. 12(a) and 12(b).) A stand 92 installed on a movable trolley 94 supported on a rail by wheels 98 has a γ A line detector 90, a lead box 96 for shielding the detector, and a collimator 95 are installed.

The collimator 95 has two types of collimators, one for short distance and one for long distance, which have different viewing angles of the drum can, 1g95'
, 95', and by sliding a collimator 95 on one unit 92, either window 95' or 95' can be selected for gamma ray detection.

91 is a tank containing liquid helium for cooling the γ-ray detector 9o.

Although not shown, there is a detector located near the surface of the drum placed on the drum support device that moves along the drum surface in the axial direction of the drum to measure the dose rate, and a detector located 1 m from the drum surface. A surface line measurement device is separately provided that measures the surface dose rate of the drum using a fixed detector that measures the dose rate.Depending on the magnitude of the drum surface dose rate measured by this surface dose rate measurement device, By moving the mobile cart 94 using the moving device 93, the distance of the gamma ray detector 90 from the drum can 1 can be changed in two ways, near and far, and the collimator 95 can also be moved through the window 95' accordingly.
, 95' is slid to select.

In this way, by selectively setting the distance from the drum can 1 to the detection lm90 and the corresponding collimator 95, it is possible to selectively set the distance from the drum can 1 to the detection lm90 and the collimator 95 corresponding thereto. ) can be measured accurately.

FIG. 13 shows an example of the layout of the device described above.

Station 1 and station 2 each have a drum support device 2 and a drum transfer device 3 as described above! !
2 are placed. Drum support device i at station 1
! In the vicinity of t2, the smear devices for side wiping, top surface wiping, and bottom surface wiping, the smear filter paper supply: iVa, and the smear filter paper recovery device are installed. Further, in the vicinity of the drum support device 2 of the station 2, the above-mentioned device for measuring the amount of contained nuclide radioactivity and the device for measuring the surface g rate are installed. The successive drums 1 sent on the conveyor are transferred to the drum support device 2 of the station 1 where they are side-loaded as described above.

Smear wiping is performed on the top and bottom surfaces (in this case, for each drum, smear filter paper is supplied to each smear head, suction held, and discharged and collected).
After that, the drums are transferred again to the conveyor 1, transported to the station 2, and transferred to the drum support device 2 there, where the surface dose rate and the amount of contained nuclide radioactivity are measured as described above. It is returned to the conveyor and sent out.

FIG. 14 shows an example of another layout. In this example, each of the above devices is installed in one station's drum support g1.
All are installed near 2. The successive drums 1 on the conveyor are transferred to the drum support device, where the smear measurements on the side, top, and bottom surfaces as well as the surface dose rate and amount of contained nuclide radioactivity are all performed, and then returned to the conveyor. and sent out.

Although the example shown in FIG. 13 requires more equipment and space than the example shown in FIG. 14, it is possible to process more drums in the same amount of time.

As described above, the surface contamination density, the amount of radioactivity contained on the nuclide side (or radioactivity concentration), and the surface dose of the drum 1 are measured. Each device/facility with the above configuration is easy to automate and is fully automatically controlled by a computer.

[Effects of the Invention] As explained above, in the present invention, a drum of radioactive waste is transferred onto a drum support and closing device using a drum transfer device, and is held in a smear head of a smear device while rotating in the circumferential direction. The contaminants on the outside surface of the drum can are wiped off and collected using a smear filter paper, and the collected smear filter paper is collected by a filter paper recovery device and sent to a contamination density measuring device.
The smear filter paper is supplied to the smear head by the filter paper supply device, and the supply and removal of the smear filter paper to and from the smear head is very easily carried out by suction and exhaust, making it possible to fully automatically inspect the surface contamination density of the drum. inspection management can be done efficiently, leading to reduced radiation exposure for workers. In addition, when measuring the amount of radioactivity contained in drums, the surface dose rate of the drums is measured, and depending on the results,
Since the distance between the drum and the gamma ray detector and the collimator aperture corresponding to the distance are automatically adjusted, the amount of radioactivity of each nuclide contained in the drum can be appropriately and accurately measured.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1(a),
(b) is a side view and a plan view of the drum support device. FIG. 2 is a schematic elevation view of the drum transfer device, FIG. 3 is a schematic perspective view of the side smear device, FIG. 4 is a schematic side view of the top smear device, and FIG. 5 is a schematic side view of the bottom smear device. 6th
FIG. 7 is a side sectional view of the smear filter paper supply device, FIG. 8 is a schematic diagram of the air system for the smear head. Figures 9(a), (b), and (C) are for the side smearing device, and Figures 10(a) and (b) are for the top smearing device.
In addition, FIGS. 11(a), (b), and (C) are explanatory diagrams of each operation of the bottom smear device, and FIGS. 12(a), (b),
(c) is a side view, a top view, and a front view of the device for measuring the amount of radioactivity of contained nuclide, and FIGS. 13 and 14 are illustrations of the device layout. 1... Drum 2... Drum support device', 3... Drum transfer device 4... Smear filter paper,
8... Smear filter paper supply device 9... Smear filter paper recovery device 56... Smear head 56a... Breathable porous pad 56c... Suction/exhaust port 62... Receiving tray 82...
Push-up plate 95...Collimator 90...γ-ray detector

Claims (1)

[Scope of Claims] 1. A movable device that is provided near a drum support device on which a radioactive waste drum is placed and rotates it in the circumferential direction, and that is movable in the axial direction of the drum relative to the drum support device. a stand, an arm rotatably connected to the moving stand and having a smear head at its tip that holds the smear filter paper against the side of the drum; a mechanism that applies force to the arm to press the smear head against the side of the drum; and a smear head. A device for wiping the side surface of a radioactive waste drum, comprising a mechanism for rotating the arm relative to the moving table so as to separate the arm from the side surface of the drum, and a mechanism for directing the smear head in the direction of feeding and discharging smear filter paper. Smear device. 2. A movable stage that is provided near a drum support device on which a radioactive waste drum is placed and rotates it in the circumferential direction, and that is movable in the diametrical direction of the drum relative to the drum support device; an arm having a smear head at its tip that is rotatably connected to and holds the smear filter paper against the top surface of the drum, a mechanism that applies a force to the arm to press the smear head against the top surface of the drum, and a mechanism that releases the smear head from the top surface of the drum. A smearing device for wiping the top surface of a radioactive waste drum, comprising a mechanism for rotating the arm relative to the moving table. 3. A movable stage that is provided near a drum support device on which a radioactive waste drum is placed and rotates it in the circumferential direction, and that is movable in the diametrical direction of the drum relative to the drum support device; and the movable base. an arm having a smear head at its tip that is rotatably connected to the drum and holds the smear filter paper against the bottom surface of the drum; a mechanism that applies a force to the arm to press the smear head against the bottom surface of the drum; A smear device for wiping the underside of a radioactive waste drum, comprising: a mechanism for rotating the arm relative to the moving table; and a mechanism for directing a smear head in the direction of feeding and discharging smear filter paper. 4 a cup-shaped case, a breathable porous pad fixed to the case so as to cover the open end of the case;
A radioactive waste drum, characterized in that the cavity formed by the pad and the case is provided with an intake and exhaust port for intake and exhaust, and is configured to suction and hold smear filter paper on the outer surface of the pad. Smear head for surface smearing. 5. A cylindrical cartridge for storing stacked smear filter papers, a smear filter paper pushing plate movable in the axial direction within the cartridge, and means for applying a pushing force to the pushing plate, and the above-mentioned cart A smear filter paper supply for a smear head for smearing the surface of a radioactive waste drum, characterized in that the pad of the smear head according to claim 4 is brought to the open end of the ridge opposite to the push plate. Device. 6. A tube-shaped passage, a smear filter paper tray that moves within the passage, an opening provided at the upper part of the passage, and a means for stopping the smear filter paper tray below the opening, A smear filter paper recovery device from a smear head for smearing the surface of a radioactive waste drum, characterized in that the pad of the smear head according to claim 4 is carried out. 7. A smear device for wiping the side, top, or bottom of a radioactive waste drum according to each of claims 1, 2, or 3, using the smear head according to claim 4 as the smear head. 8. A movable stage provided near a drum support device on which a radioactive waste drum is placed and rotated in the circumferential direction and moved up and down, and whose distance from the drum support device is variable, and a γ installed on the movable base. a collimator installed on the movable table and capable of setting collimator windows corresponding to a plurality of distances between the gamma ray detector and the drum on the drum support device; and a drum surface separately arranged. Based on the measurement results of the dose rate measuring device, the movable table is moved so that the distance between the drum on the drum support device and the gamma ray detector is selected from one of the plurality of distances, and the moving table is adapted accordingly. and means for setting the collimator window. 9. A conveyor for transporting radioactive waste drums, a first drum support device installed at one station of the conveyor, and a first drum support device for transferring the drums from the conveyor to the first drum support device and vice versa. Claim 5: A smear device having a drum transfer device and a smear head as described in Claims 1, 2, and 3, respectively, and as a smear head, installed near the first drum support device. The smear filter paper feeding device and the smear filter paper recovery device according to claim 6, a second drum support device installed at another station of the conveyor, and from the conveyor to the second drum support device and vice versa. 9. A radioactive waste drum inspection facility comprising: a second drum transfer device for transferring the drum; and a content measuring device for the amount of radioactivity according to claim 8, which is installed near the second drum support device. 10. A conveyor for transporting radioactive waste drums, a drum support device installed at one station of the conveyor, a drum transfer device for transferring drums from the conveyor to the drum support device and vice versa; Claims 1, 2 and 3 installed near the drum support device.
and a smearing device each having a smear head according to claim 4 as a smear head, a smear filter paper supply device according to claim 5, a smear filter paper recovery device according to claim 6, and a contained radioactivity amount measuring device according to claim 8. Radioactive waste drum inspection equipment consisting of .