JPH032585A - Fine particle capturing device with radioactivity detector - Google Patents

Abstract

PURPOSE:To surely remove fine particles having radioactivity by impressing a high voltage to the fine particles scattered in air to ionize the particles and capturing the fine particles while detecting and displaying the intensity of the radioactivity. CONSTITUTION:The fine particles which have the radioactivity and scatter in the air in a room are taken together with the air into a casing 1 from an air inlet 1a as a fan 4 revolves. The fine particles are impressed with the high voltage and are thereby ionized in an ionizing section 7. The ions are captured by an electrical capturing device 8. The radiation intensity in the capturing device 8 is detected and displayed by a detected 9. A cleaning liquid is supplied from a feed/drain pipe 14 into a cleaning tank 12 to wash away the captured fine particles when large amt. of the fine particles having the radioactivity are captured in the capturing device. 8. The cleaning liquid is thereafter dis charged from the pipe 14. The fine particles of radioisotope, etc., having the radioactivity are then electrically surely captured and removed and the immedi ate responding with the cleaning and exchanging of the capturing part 8 is possible by immediately detecting the capturing condition.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a particle collection device equipped with a radioactivity detector that collects radioactive particles such as radioisotopes used mainly in laboratories.

(Conventional technology) Generally, in laboratories that research biotechnology, etc.
Non-sealed radioisotopes such as iodine, carbon, or phosphorus are used, and radioactive radioisotope particles are scattered in the air, causing indoor contamination and having a negative impact on the human body. Scattered radioactive particles such as radioisotopes are discharged outdoors, but at night or when not in use,
Since the exhaust gas treatment equipment is shut down, there is a problem in that radioisotope particles gradually accumulate inside the room.

In addition, using high-performance Heba filters and activated carbon,
It is possible to collect and remove radioisotope particles, but these are all consumables and must be replaced, which increases running costs and poses various problems with post-processing when replacing them. It happens.

The present invention was developed in view of the following two problems, and its purpose is to eliminate radioactive particles such as radioisotopes at low running costs and without causing pollution problems. An object of the present invention is to provide a particulate collection device with a radioactivity detector that can reliably collect and remove particles.

(Means for Solving the Problems) A particle collection device with a radioactivity detector according to the present invention includes a casing (1) having an air inlet (1a) and an air outlet (1b). 1a) to the air outlet (1b
); a fan (4) that circulates air through the fan (4);
An ionization section (7) for ionizing fine particles scattered in the air by applying a high voltage across the inlet side passage (2) of the air flowing through the air, and an electric collection section (8) are installed therein; A radioactivity detector (9) for detecting the radiation intensity in the collecting section (8) is provided near the electric collecting section (8), while displaying the radiation intensity detected by the detector (9). The device is characterized in that it is provided with a display device (10).

A cleaning tank (12) is provided at the lower part of the casing (1), and one side of the cleaning tank (12) is provided with a cleaning tank (12).
) is provided with a partition wall (5) having a cylindrical portion (5a) that guides the inlet side passage (2) in the cleaning tank (12), and the cylindrical portion (5a) of this partition wall (5) 5a) internally so that its tip is located near the bottom of the cleaning tank (12),
An electric collection part (8) is attached to the tip of this cylindrical part (5a), and an outer surface of the cylindrical part (5a) and a cleaning tank (12) are attached.
) is formed with an outlet passageway (13) communicating with the outlet side of the electrical collection section (8).
) is connected to the air outlet (1b) of the casing (1), while a cleaning liquid supply/discharge pipe (14) is connected to the cleaning tank (12).
) may be connected.

Furthermore, a date and time display (16) may be provided with a resettable timer for measuring the display interval of the display (10).

(Function) Radioactive particles such as radioisotopes scattered in the indoor air are taken in with the air from the air inlet (1a) into the casing (1) as the fan (4) rotates, and are ionized. A high voltage is applied in the section (7) to ionize the particles, and the ionized particles are reliably collected in the electric collection section (8) to purify the indoor air. Also, at this time, the radiation intensity at the collection section (8) is detected by a detector (9) near the collection section (8) and displayed on the display (10), Therefore,
By checking the display value of this indicator (10), it is possible to immediately know the collection state (A-line state) of radioactive particles in the collection section (8), and the collection section (
8) can be quickly cleaned or replaced, and operation can be stopped if the displayed value does not increase.

Further, a cleaning tank (12) is provided at the bottom of the casing (1), and the cleaning tank (12) is provided with a cleaning tank (12) on three sides of the casing (1).
1) is provided with a partition wall (5) having a cylindrical portion (5a) that guides the inlet side passage (2) into the washing tank (12), and the cylindrical portion of this partition wall (5) (5a) is installed inside the cleaning tank (12) so that its tip is located near the bottom of the cleaning tank (12), and the electric collection part (8) is installed at the tip of this cylindrical part (5a). At the same time, the outer surface of the cylindrical part (5a) and the cleaning tank (
An outlet passage (13) communicating with the outlet side of the electrical collection section (8) is formed between the inner surface of the electric collecting section (8) and the inner surface of the
13) is connected to the air outlet (1b) of the casing (1), while a cleaning liquid supply/discharge pipe (
14), if a large amount of radioactive particles are collected in the collection section (8), the cleaning liquid is discharged from the supply/discharge pipe (14) into the cleaning tank (8). The cleaning liquid is supplied to the collection part (8) to wash away the fine particles collected in the collection part (8), and the cleaning liquid after cleaning is taken out to the outside through the supply/discharge pipe (14). You can easily play it while it is in place without having to remove it.

Furthermore, when a date and time display (16) equipped with a resettable timer for adjusting the display interval of the display (1o) is provided, the amount of radioactive particles per certain period of time can be measured, and radiation control can be carried out. It becomes easier.

(Example) The particle collection device with a radioactivity detector shown in FIGS. 1 and 2 has a cylindrical casing body (IA) that is long in the vertical direction.
and a lid (IB) attached to the upper side of the main body (IA) to constitute a casing (1), and a plurality of air inlets (1a) are opened in the lower peripheral wall of the lid (IB), Further, an air outlet (1b) is provided on the lower side of the main body (IA), and indoor air flows inside the casing (1) between the air inlet (1a) and the air outlet (1b). In addition to forming two downward inlet side passages (2) and an outlet passage (13) to be described later, a suction filter (3) is disposed inside and above the main body (IA), and a suction filter (3) is disposed below the filter (3). A fan (4) having a fan motor (4a) is provided at the part, and the air inlet (1) is rotated by driving the fan (4).
Indoor air taken in from a) is discharged to the air outlet (1b) via the inlet passageway (2) and the outlet passageway (13).

Further, inside the casing main body (IA), air taken in by the fan (4) flows to the lower side of the fan (4), and a partition wall ( 5) is arranged on the inner upper side of this cylindrical part (5a),
A dust removal filter (6) made of wire mesh or the like is provided in a transverse manner, and the filter (6) removes dust in the air from the inlet side passageway (2) to the inside of the cylindrical part (5a). At the same time, an ionization section (7) consisting of a large number of ionization lines is disposed in a transverse manner in the inner middle part of the cylindrical section (5a), and a high voltage is applied to the ionization section (7). This ionizes fine particles scattered in the intake air, and at the same time, an electric conductor consisting of a plurality of dust collecting electrodes is installed on the inner lower side of the cylindrical part (5a), facing the ionizing part (7). A collection section (8) is provided, and the particulates ionized by the ionization section (7) are collected in the collection section (8).

The collecting part ( A radioactivity detector (9) for detecting the radiation intensity in step 8) is attached, and the detector (9) is attached to the outer wall surface of the casing (1).
A display device (10) was installed to display the intensity of the radiation detected.

Specifically, as shown in Figure 2, a display panel (11) equipped with various sign lamps (L) for operation, cleaning, etc. is attached to the upper outer wall surface of the casing body (IA). The panel (11) is provided with the display (10), and the display (10) displays the radiation intensity of the collection section (8).

By arranging the collection device configured as described above in a corner of a laboratory, etc., the indoor air of the laboratory will flow as indicated by the arrow in FIG. 1 as the fan (4) rotates. The fine particles in the air that circulate through such a route are ionized by the ionization section (7) and reliably collected by the electric collection section (8), thereby purifying the indoor air. It will be done. Also, at this time, the radiation intensity of the particles collected by the collecting section (8) is detected by the detector (9) and displayed on the display (10). By checking the displayed value on the display (10), it is possible to immediately know the state of collection of radioactive particles such as radioisotopes in the collection section (8). ) can be quickly cleaned or replaced. In addition, by checking the displayed value on an hourly basis, it is possible to know the level of radioactive contamination in the laboratory, so if the increase in the displayed value within a predetermined period of time is small, operation can be stopped. Therefore, unnecessary operation can be avoided and running costs can be reduced.

Furthermore, a cleaning tank (12) is disposed at a predetermined gap on the outer periphery of the cylindrical portion (5a) of the partition wall (5) inside the caning main body (1A), and (5a) is installed inside the cleaning tank (12) so that its tip is located near the bottom of the cleaning tank (12), and the outer surface of the cylindrical part (5a) and the cleaning tank (
An outlet passage (13) communicating with the outlet side of the electrical collection section (8) is formed between the inner surface of the electric collecting section (8) and the inner surface of the
A flexible supply/drain pipe (13) is connected to the air outlet (1b) of the casing (1), and a flexible supply/drain pipe ( 14)
At the same time, a storage space (1c) for storing the supply/discharge pipe (14) is formed on the outer wall surface of the main body (IA) at the lower side of the panel (11), and under normal conditions, the space (1c) is The supply/discharge pipe (14) is housed in the housing. In addition, as the collection unit (8) collects radioactive particles such as radioisotopes, the display unit (8)
When the radiation intensity of the collection part (8) indicated in 10) reaches a predetermined value or more, the supply/discharge pipe (14) is taken out from the space (1c), and the supply/discharge pipe (14) is A cleaning liquid is supplied to the washing tank (12) through the washing tank (12), and the collection part (8) is washed with this cleaning liquid, thereby regenerating the particulate collection ability of the collection part (8).

An ultrasonic oscillator (
15) is installed, and the oscillator (15) oscillates ultrasonic waves when cleaning the collection part (8), so that the cleaning work of the collection part (8) can be performed well.

Furthermore, the panel (11) on which the display device (10) is provided.
is provided with a date and time display (16) having a timer for measuring the display interval of the display (10) and a reset button (B) for the timer.
) by measuring the display interval of the display (10), that is, the time taken to collect radioactive particles by the electric collection unit (8), the radioactivity per certain period of time can be measured. By measuring the amount of particulate matter, in other words, estimating the amount of radiation that people in the laboratory will be exposed to, radiation management is facilitated.

In addition, in the embodiments in each figure, the casing (1)
The internal space of the lid body (IB) constituting the is used as an electrical box, and a recess (1d) is formed in the upper side of this lid body (IB) to mount an experimental instrument (F) such as a flask. There is.

(Advantageous Effect) As explained above, in the particulate collector with radioactivity detector of the present invention, the air inlet (1a) and the air outlet (1b) are provided in the casing (1). A fan (4) that circulates air from (1a) to the air outlet (1b), and an inlet side passage (
2) and an ionization section (7) that ionizes fine particles scattered in the air by applying a high voltage, and an electric collection section (8).
At the same time, a radioactivity detector (9) for detecting the radiation intensity in the collecting part (8) is provided near the electric collecting part (8), while a radioactivity detector (9) for detecting the radiation intensity in the collecting part (8) Since a display (10) is provided to display the radiation intensity, it is possible to electrically capture radioactive particles such as radioisotopes without causing pollution problems and with low running costs. Furthermore, by checking the displayed value on the display (10), the state of collection of radioactive particles in the collection section (8) can be immediately known; This made it possible to immediately respond to cleaning and replacement of the collection section (8). In addition, by checking the displayed value on an hourly basis, it is possible to know the level of radioactive contamination in the laboratory, so if the increase in the displayed value within a predetermined period of time is small, operation can be stopped. Therefore, unnecessary operation can be avoided and running costs can be reduced.

Further, a cleaning tank (12) is provided at the lower part of the casing (1), and an inlet side passage (2) in the casing (1) is connected to the inside of the cleaning tank (12) above the cleaning tank (12). A partition wall (5) having a cylindrical portion (5a) leading to The electric collection part (8) is attached to the tip of this cylindrical part (5a), and the outer surface of the cylindrical part (5a) and the cleaning tank (1
An outlet passage (13) communicating with the outlet side of the electrical collection section (8) is formed between the inner surface of the electric collecting section (8) and the inner surface of the
3) is connected to the air outlet (1b) of the casing (1), while a cleaning liquid supply/discharge pipe (1) is connected to the cleaning tank (12).
4), do not remove the collection part (8) in case a large amount of radioactive particles such as radioisotopes are collected in the collection part (8). (It is possible to easily play back the screen while it is still set.

Furthermore, when a date and time display (16) is provided with a resettable timer for measuring the display interval of the display (10), it is possible to measure the amount of radioactive particles such as radioisotopes per certain period of time, Management is easy.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a particulate collection device with a radioactivity detector according to the present invention, and FIG. 2 is a perspective view showing the overall structure of the collection device. (1) - Casing (1a) Air inlet (1b) Air outlet (2) Inlet side passage (4) ・ (5) ・ (5a) ) Urn (9)・・Fan number partition wall・Cylinder part Ionization part・Electric collection part・Detector・Display device・Cleaning tank exit passage Φ Supply/drain pipe・Date and time display Fig. 2

Claims (1)

[Claims] 1) A fan (4) for circulating air from the air inlet (1a) to the air outlet (1b) in a casing (1) having an air inlet (1a) and an air outlet (1b). ), an ionization section (7) that crosses the inlet side passage (2) of the air circulated by the fan (4) and ionizes fine particles scattered in the air by applying a high voltage, and an electric collection section ( 8) is installed internally, and a collection section (8) is installed near this electrical collection section (8).
Radioactivity detector (9) for detecting radiation intensity in 8)
What is claimed is: 1. A particulate collection device with a radioactivity detector, characterized in that a display device (10) is provided to display the intensity of radiation detected by the detector (9). 2) A cleaning tank (12) is provided at the bottom of the casing (1), and above the cleaning tank (12), the casing (1)
A partition wall (5) having a cylindrical portion (5a) that guides the inlet side passage (2) into the cleaning tank (12) is provided, and the cylindrical portion (5a) of this partition wall (5) ) is installed so that its tip is located near the bottom of the cleaning tank (12), and the electric collection part (8) is attached to the tip of the cylindrical part (5a). External surface of section (5a) and cleaning tank (12)
An outlet passageway (13) communicating with the outlet side of the electrical collection section (8) is formed between the inner surface of the
is connected to the air outlet (1b) of the casing (1), while a cleaning liquid supply/discharge pipe (14) is connected to the cleaning tank (12).
2. The particulate collection device with a radioactivity detector according to claim 1, further comprising a radioactivity detector. 3) The particulate collection device with a radioactivity detector according to claim 1, further comprising a date and time indicator (16) equipped with a resettable timer for measuring the display interval of the indicator (10).