JPH06180366A - Gate monitor - Google Patents

Abstract

PURPOSE:To allow the smooth measurement of contamination without requiring a long preparation time even for an untrained person, e.g. a visitor, by designating each operation mode for setting the arrangement of each radiation detector. CONSTITUTION:Operation mode, e.g. expert mode, visitor mode, hands/feet nonsetting mode, or unconditional mode, is set by an external setting means 10 when radioactive contamination is monitored and measurement starting conditions are modified according to the operation mode thus set and then contamination is measured by means of radiation detectors 4a-4j.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gate monitor used in, for example, a nuclear facility to monitor radioactive contamination on a body surface of a person to be measured.

[0002]

2. Description of the Related Art Such a gate monitor is installed at the entrance / exit of a nuclear facility building,
It is intended to detect the radioactive contamination on the human body surface of workers working in nuclear facilities and ensure the safety of workers.

Recently, as a nuclear power plant, the facility is becoming large-scale like a nuclear power plant, and the necessity of measuring and processing the radioactive contamination of the whole body of many workers who work there is increasing. And, the measurement is designed to be fully automatic.

The radioactive contamination monitor under such a situation is roughly divided into a series of operations, firstly, an operator enters the gate monitor, and secondly, the radioactive contamination is measured by the monitor. Third, the worker exits the gate monitor.

Further, in the gate monitor, when measuring radioactive contamination, each radiation detector is arranged around the operator's body, and each door at the entrance and exit of the gate monitor houses the radiation detector. These doors are structured to open and close when workers enter and leave.

The specific operation of the gate monitor operates according to the sequence shown in FIG. That is, when the worker of the facility enters the gate monitor in the standby state of step # 1, the worker's foot is detected by the foot detection switch in step # 2, and the entrance door of the gate monitor is closed.

Next, when the operator's hand is placed at a predetermined position in the gate monitor room, in step # 3, the head radiation detector and the temporal radiation detector provided on the gate monitor are lowered to the predetermined positions. Is located in.

Next, when the counting start condition is satisfied, that is, it is determined in step # 4 that the radiation detectors are arranged at the predetermined positions, and it is detected that the limbs of the worker are at the predetermined positions, In step # 5 of 1), counting by each radiation detector is started. If the counting start condition is not satisfied, counting by each radiation detector is not started.

Next, in step # 6, the contamination state of the worker is judged from the count value of each radiation detector, and if there is no contamination as a result of this judgment, the exit door is opened and closed in steps # 7 and # 8, and If it is contaminated, the operator cannot pass through the gate monitor with the entrance door opened and the exit door closed in step # 9.

However, in the gate monitor, if the counting start condition is not satisfied, each radiation detector does not proceed to the next sequence operation of starting counting.

For this reason, when a visitor of a nuclear facility or an escort to enter only a limited area, a person who uses the gate monitor for the first time does not have a perfect hand setting position or foot setting. Since the position is not perfect, it takes a long time to start measuring contamination.

[0012]

As described above, if the counting start condition is not satisfied, the sequence operation does not proceed to the next sequence operation. The setting position is not perfect and it takes a long time to start measuring contamination.

Therefore, according to the present invention, by instructing each operation mode in which the arrangement of each radiation detector is set, it is obvious that there is no possibility of contamination, and even a person who cannot be an observer can take a long time before starting the measurement of contamination. It is an object of the present invention to provide a gate monitor capable of smoothly measuring contamination without the need for a monitor.

[0014]

SUMMARY OF THE INVENTION The present invention provides a gate monitor in which a plurality of radiation detectors are arranged around a measurement target and the radiation detectors monitor radioactive contamination on the surface of the measurement target.

Driving means for arranging a predetermined radiation detector among the radiation detectors at a predetermined position with respect to the measurement target, detection means for detecting that a predetermined portion of the measurement target is set at the predetermined position, and radiation. The mode setting means for setting the operation mode of the active contamination monitor and the counting start condition of each radiation detector according to the operation mode set by the mode setting means are changed, and the driving means and detection are performed according to the counting start condition. And a control means for controlling the operation of the means to achieve the above object.

[0016]

With the provision of such means, when the operation mode of the radioactive contamination monitor is set by the mode setting means, the operation mode of the radioactive contamination monitor on the surface to be measured is adjusted according to the set operation mode. Then, the counting start condition is changed and the operation of the drive means and the detection means is controlled by the control means.

Thereby, for example, the contamination measurement is started in an operation mode in which a predetermined radiation detector is arranged at a predetermined position with respect to the measurement object, or in addition to this, a predetermined portion of the measurement object is set at the predetermined position. The pollution measurement is started in the specified operation mode.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of the gate monitor as seen from the side, and FIG. 2 is a configuration diagram of the monitor as seen from above. An entrance door 2 and an exit door 3 are rotatably provided in the gate monitor body 1.

The gate monitor body 1 is provided with radiation detectors 4a to 4j. Of these, the radiation detector 4a is a head radiation detector, and the head radiation detector 4a has a right head radiation detector 4i as shown in FIG.
And the left head radiation detector 4j are drive units 5a, 5 respectively.
It is provided rotatably via b. Further, the head and left and right radiation detectors 4a, 4i, 4j are provided in a head detector driving mechanism 6 and can be moved up and down.

The radiation detector 4b provided in the lower part of the gate monitor body 1 is a foot radiation detector, and the radiation detectors 4c and 4d are arranged in front of the worker to be measured, The radiation detectors 4e and 4f are disposed behind the operator, the radiation detector 4g is provided on the entrance door 2, and the radiation detector 4h is provided on the exit door 3.
A hand insertion detection switch 7 is provided on the front side of the gate monitor body 1, and a foot detection switch 8 is provided on the lower side.

The gate monitor main body 1 is provided with a main body control device 9, to which the radiation detectors 4a to 4j, the head detector drive mechanism 6, the drive units 5a and 5b, the hand insertion detection switch 7, The foot detection switch 8 and the drive units of the doors 2 and 3 at the entrance / exit are connected.

On the other hand, an external setting device 10 is provided separately from the gate monitor body 1. This external setting device 10
Has a function of setting an operation mode of the radioactive contamination monitor and transmitting this operation mode to the main body control device 9.
Here, the operation mode can be set to a veteran mode, a visitor mode, a limb setting omission mode, and an unconditional mode.

Among them, the veteran mode is intended for workers (experienced persons) who enter a nuclear facility on a daily basis, and all the radiation detectors 4a to 4j are arranged at predetermined positions,
In addition, the contamination measurement mode is a mode in which the hand insertion detection switch 7 and the foot detection switch 8 detect a limb.

The visitor mode is intended for a person who temporarily enters the facility while visiting a nuclear facility. Since there is almost no possibility of contamination, the radiation detectors 4 on the head and the left and right sides are provided.
In this mode, contamination measurement is performed even when a, 4i, 4j are not lowered and the limbs are not detected by the hand insertion detection switch 7 and the foot detection switch 8.

The limb setting omission mode is intended for those who temporarily enter the facility such as a visit to a nuclear facility and only enter a very limited area. Since there is almost no possibility of contamination, the foot detection switch 8 Is a mode in which contamination measurement is performed in a state in which the operator's foot is detected.

The unconditional mode is intended for those who have no possibility of radioactive contamination due to a facility tour, etc. When the foot is detected by the foot detection switch 8, the entrance door 2 is closed and the exit door 3 is opened. It is open.

The main body control device 9 is an external setting device 10
The operation mode set in step 1 is received to determine its content, the detection states of the hand insertion detection switch 7 and the foot detection switch 8 are determined according to this operation mode, and each radiation detector 4
a to 4j, head detector drive mechanism 6, each drive unit 5a, 5
b, it has a function of controlling the operation of the drive units of the doors 2 and 3 at the entrance and exit. Next, the operation of the apparatus configured as described above will be described with reference to the contamination measurement flow chart shown in FIG.

(1) Step # for the external setting device 10
At 20, an operator sets an operation mode, for example, one of a veteran mode, a visitor mode, a limb setting omission mode, or an unconditional mode according to the measurement target person. When this operation mode is set, in the next step # 21, the external setting device 10 transmits the operation mode to the main body control device 9 of the gate monitor main body 1. On the other hand, the main body control device 9 receives the operation mode and stores it in the internal memory in step # 30.

When a person to be measured enters the gate monitor main body 1 in this state, the main body control device 9 judges the contents of the operation mode in step # 31, and if it is the veteran mode from this judgment result, it goes to step # 40. In the visitor mode, the process proceeds to step # 50, in the limb setting omitting mode, the process proceeds to step # 60, and in the unconditional mode, the process proceeds to step # 70. (2) Next, the operation of each operation mode will be described. First,
The veteran mode will be described with reference to the flowchart shown in FIG.

When a veteran worker enters the gate monitor main body 1, the main body controller 9 closes the door 2 at the step # 41 by judging that the foot of the worker is detected by the foot detecting switch 8. .

Next, when the main body control device 9 determines that the hand of the operator has been inserted and the hand insertion detection switch 7 has detected the hand, in step # 42, the head detector drive unit 6 is driven to drive the head. The partial radiation detector 4a and the radiation detectors 5a and 5b on the left and right sides are lowered and placed at predetermined positions.

Next, the main body control device 9 determines in step # 43 whether or not the counting start condition is satisfied. In this case, the counting start condition is that the head radiation detector 4a and the left and right radiation detectors 5a and 5b are arranged at predetermined positions,
Moreover, the operator's hand is placed at a predetermined position by the detection of the hand insertion detection switch 7, and the operator's foot is at the predetermined position by the detection of the foot detection switch 8.

When it is determined that the counting start condition is satisfied, the main body control device 9 moves to step # 44 to count the radiation dose by the radiation detectors 4a to 4j. During the counting, if either the hand or the foot of the operator is displaced from the predetermined position and the hand insertion detection switch 7 or the foot detection switch 8 stops detecting, the main body control device 9
Clears the counting of the radiation dose by each of the radiation detectors 4a to 4j and restarts the counting of the radiation dose from the beginning.

Next, when the counting of the radiation dose is completed, the main body control unit 9 judges the radioactive contamination based on the counted value of the radiation in step # 45. If the result of this judgment is that there is no contamination, step # 45 At 46, the exit door 3 is opened, and if it is contaminated, the exit door 3 is closed and the entrance door 2 is opened at step # 47. Therefore, if there is contamination, the worker cannot pass through the gate monitor. (3) Next, the visitor mode will be described with reference to the flowchart shown in FIG.

When an observer enters the gate monitor main body 1, the main body controller 9 closes the entrance door 2 in step # 51 when it is determined that the visitor's foot is detected by the foot detection switch 8.

Next, when the main body control device 9 judges that the hand of the visitor is inserted and the hand insertion detection switch 7 detects the hand, it moves to step # 43 and judges whether the counting start condition is satisfied. To do.

In this case, the observing mode counting start condition is that the hand of the observing person is placed in a predetermined position by the detection of the hand insertion detecting switch 7, and the observing person's foot is in the predetermined position by detecting the foot detecting switch 8. Is it there?

When it is determined that the counting start condition is satisfied, the main body control unit 9 proceeds to step # 53 to count the radiation dose by the radiation detectors 4a to 4j. During this counting, the observer's hands and feet are displaced from predetermined positions, and the hand insertion detection switch 7 or the foot detection switch 8
Even if the limbs are no longer detected by the
The radiation detectors 4a to 4j continue counting without clearing the counting of the radiation dose. Next, when the counting of the radiation dose is completed, the main body control device 9 moves to step # 45 shown in FIG. 5 and determines the radioactive contamination based on the counted value of the radiation. (4) Next, the limb setting omission mode will be described with reference to the flowchart shown in FIG.

When an observer or the like enters the gate monitor main body 1, the main body controller 9 closes the entrance door 2 in step # 61, judging that the visitor's foot is detected by the foot detection switch 8.

Next, the main body control device 9 counts the radiation dose by each of the radiation detectors 4a to 4j without judging the counting start condition. Even if the observer's hands and feet are displaced from predetermined positions during this counting and the hand insertion detection switch 7 or foot detection switch 8 is no longer detected, the main body control device 9
The radiation detectors 4a to 4j continue counting without clearing the counting of the radiation dose. Next, when the counting of the radiation dose is completed, the main body control device 9 moves to step # 45 shown in FIG. 5 and determines the radioactive contamination based on the counted value of the radiation. (5) Next, the unconditional mode will be described with reference to the flowchart shown in FIG.

When an observer or the like enters the gate monitor main body 1, the main body control device 9 closes the entrance door 2 in step # 71, judging that the visitor's foot has been detected by the foot detection switch 8.

Next, the main body control device 9 does not judge the counting start condition, and does not count the radiation dose by the radiation detectors 4a to 4j, and opens the exit door 3 in step # 72.

As described above, in the above embodiment, the operation mode of the radioactive contamination monitor is set by the external setting means 10, the measurement start condition is changed according to this operation mode, and the contamination is measured by the radiation detectors 4a-4j. Since this is performed, even an unfamiliar person such as a visitor can smoothly measure contamination without requiring a long time before starting the measurement of contamination. For example, a visitor who temporarily enters during a visit to a nuclear facility, a visitor during a visit to a nuclear facility, and a visit to a very limited area, a visit to a nuclear facility, etc. Even visitors who have no possibility can smoothly measure contamination. The present invention is not limited to the above-described embodiment, and may be modified within the scope of the invention.

For example, the external setting device 10 may be replaced with the external setting switch 11 as shown in FIG. The external setting switch 11 has each contact in each operation mode, and has a function of transmitting a signal according to the operation mode to the main body control device 9 by selectively switching the contact.

The external setting device 10 and the external setting switch 11 may be housed inside the gate monitor main body 1 or may be detachably attached to the gate monitor main body 1 to change the operation mode. Sometimes the gate monitor body 1
It may be attached to the. Further, the external setting device 10 and the external setting switch 11 may perform signal transmission with the main body control device 9 through a cable, optical transmission, radio waves, or the like.

[0046]

As described in detail above, according to the present invention, even if a person such as an observer can not wait for a long time before starting the measurement of contamination, by instructing each operation mode in which the arrangement of each radiation detector is set. It is possible to provide a gate monitor that can smoothly measure contamination without requiring time.

[Brief description of drawings]

FIG. 1 is a side view showing a configuration of an embodiment of a gate monitor according to the present invention.

FIG. 2 is a configuration diagram of the gate monitor viewed from above.

FIG. 3 is a configuration diagram of a head radiation detector in the gate monitor.

FIG. 4 is a flow chart of contamination measurement in the gate monitor.

FIG. 5 is a flow chart of contamination measurement in the expert mode in the gate monitor.

FIG. 6 is a flowchart of contamination measurement in a visitor mode in the gate monitor.

FIG. 7 is a flow chart of contamination measurement in a limb setting omission mode in the gate monitor.

FIG. 8 is a flow chart of contamination measurement in an unconditional mode in the gate monitor.

FIG. 9 is a configuration diagram showing a modified example of the gate monitor.

FIG. 10 is a flow chart of contamination measurement in a conventional gate monitor.

[Explanation of symbols]

1 ... Gate monitor main body, 2 ... Entrance door, 3 ... Exit door, 4a
... 4j ... Radiation detector, 5a, 5b ... Drive part, 6 ... Head detector drive mechanism, 7 ... Hand insertion detection switch, 8 ... Foot detection switch, 9 ... Main body control device, 10 ... External setting device.

Claims (1)

[Claims] 1. A gate monitor in which a plurality of radiation detectors are arranged around a measurement target, and these radiation detectors monitor radioactive contamination on the surface of the measurement target. Means for arranging a container at a predetermined position with respect to the measurement target, detection means for detecting that a predetermined portion of the measurement target has been set at the predetermined position, and mode for setting an operation mode of the radioactive contamination monitor Setting means and control means for changing the counting start condition of each radiation detector according to the operation mode set by the mode setting means, and controlling the operation of the driving means and the detection means according to the counting start condition. And a gate monitor.