JPH06102354A - Display of radiation intensity - Google Patents

Abstract

PURPOSE:To save labor for radiation measurement and clearly display radiation intensity distribution by automatizing measurement and display of the radiation intensity. CONSTITUTION:Radiation generating sources A, B, a radiation measuring means 2, a position detecting means 3, a moving means 4, a computing means 5 and a display means 6 are provided. The radiation measuring means 2 and the position detecting means 3 constitute a measuring part 9, where a transmitter is provided to transmit a positional signal and a radiation detection signal. The measuring part 9 can be moved to any direction or to any position in a preset area by the moving means. The computing means 5 computes the radiation intensity at such a position in accordance with the positional signal from the position detecting means 3 mounted in the measuring part 9 and a measurement signal from the radiation measuring means 2. The result of computation is displayed on a display means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiation intensity (or a radiation dose rate representing a radiation dose per unit time; Sv (sievert) / H (hour), mSv (millisievert) measured by radiation measuring means. ) / H (time)) is digitally processed using a microcomputer or the like to display the average value or the maximum value of the radiation intensity within a predetermined time.

[0002]

2. Description of the Related Art Generally, in a nuclear power plant or the like, the radiation direction, intensity, dose equivalent rate, etc. of radiation (especially γ-rays) emitted from equipment or piping etc. are detected, and a dose equivalent rate map etc. Therefore, it is necessary to manage the exposure of workers.

Conventionally, this kind of exposure control is performed by artificially measuring the radiation intensity line atmosphere in the work area and plotting or displaying it, so that there is a major problem of exposure of the measurement operator. However, there is a drawback that the work is complicated and takes a long time. Since it is dangerous for an operator to enter a place with a certain radiation intensity or more, it is possible to measure and display the radiation intensity at any position within the prescribed area and notify the operator of the range of the dangerous area in advance. It would be convenient if possible.

[0004]

SUMMARY OF THE INVENTION The present invention has been made based on such a point of view. The labor of radiation measurement work is reduced by automating the work of measuring and displaying radiation intensity and the like, and The purpose is to clearly display the intensity distribution.

[0005]

A radiation intensity display device of the present invention is a radiation measuring means for measuring the radiation intensity generated from a radiation source disposed in a predetermined area such as a nuclear power plant, and the like. A moving means that is equipped with a radiation measuring means and is movable in at least one of the X-axis direction and the Y-axis direction horizontal to the floor plane and the Z-axis direction perpendicular to the floor plane, and the moving means. Position detecting means for detecting the position of the radiation detecting means, calculating means for calculating the radiation intensity near a predetermined point in a predetermined area obtained by the position detecting means and the radiation measuring means, and display means for displaying the result of the calculation processing. It is characterized by comprising and.

Here, the radiation intensity in the vicinity of a predetermined point means a representative value such as an average value or a maximum value of the radiation intensity of a predetermined point and a straight line, a plane or a three-dimensional surface including the predetermined point.

[0007]

According to the radiation intensity display device of the present invention, since the representative value of the radiation intensity at any point is displayed on the display means,
It is easy to determine whether the worker is at risk and whether the equipment is operating normally.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a block diagram showing a first embodiment of the present invention, FIG. 2 is a schematic side view showing a measuring unit of a ceiling suspension system according to the first embodiment of the present invention, and FIG. 3 is a ceiling suspension system. FIG. 4 is a schematic plan view showing the measuring unit, FIG. 4 is a perspective view showing the measuring position, and FIG. 5 is a sectional view showing the radiation detecting unit of the measuring unit.

In FIG. 1, A and B are radiation sources, and 2
Is radiation measuring means, 3 is position detecting means, 4 is moving means,
Reference numeral 5 is a calculation means, and 6 is a display means. As the position detecting means 3 used here, a stepping motor or the like attached to the moving means 4 can be used, and as the radiation measuring means 2, a counting rate meter (rate meter) can be used. The radiation detecting unit of the radiation measuring unit 2 is N
A radiation detector 22 such as an al (Tl) scintillation detector or SSD (semiconductor detector) is provided. The radiation detector 22 is shielded by the container 20 made of lead or the like in order to effectively introduce only the radiation from a predetermined direction. The container 20 can be moved up and down and left and right in order to expand the radiation angle range detected by the radiation detector 22. Reference numeral 23 is an output signal line of the radiation detector 22.

A measuring section 9 is formed by the radiation measuring means 2 and the position detecting means 3, and a transmitter for transmitting a position signal and a radiation detecting signal is provided on the measuring side portion 9. In addition, as shown in FIGS. 2 and 3, the measuring side portion 9 can be moved in a predetermined area by a moving means 25 in an arbitrary direction or an arbitrary place.

The moving means 25 is provided with an X-axis direction rail 10 fixed to a ceiling portion in a region where the radiation sources A and B are located in parallel with the floor surface, and a Y-axis direction rail 11 orthogonal to the X-direction rail 10. The Y-axis rail 11 is X relative to the axial rail 10.
The movable Y-axis rail 11 is provided with a transfer device 26 that can be moved to any position in the Y-rail axial direction, and can be moved up and down. Rail 12 is provided, and the measuring unit 9 is attached to the lower end of the rail 12. The measuring unit 9 can be adjusted by the vertically movable rail 12 so as to be installed at an arbitrary vertical height position in the Z-axis direction below the transport device 26.

A receiver for receiving a signal from the transmitter is provided in a monitoring room provided outside the area where the radiation sources A and B are located. In the computer installed in the monitoring room, the radiation intensity signal and the position signal received by the receiver are input to the calculation means 5 in the form of pulse signals, and the calculation means 5 is input.
Calculates the radiation intensity at that position based on the position signal from the position detection unit 3 mounted on the measurement unit 9 and the measurement signal from the radiation measurement unit 2.

The result of the calculation is displayed on the display means. The display mode of this display means includes, for example, a two-dimensional display and a three-dimensional display. , The plane coordinates parallel to the floor plane are taken, and the radiation intensity within the plane coordinates is displayed. As a display method, numerical values may be simply described, or dangerous states may be colored and displayed. It may be displayed in a shaded color corresponding to the radiation intensity level. You may display by drawing on a contour line.

Then, plane coordinates perpendicular to the floor plane are taken, and the radiation intensity within the plane coordinates is displayed. As a display method, numerical values may be simply described, or dangerous states may be colored and displayed. It may be displayed in a shaded color corresponding to the radiation intensity level. You may display by drawing on a contour line. Alternatively, the radiation intensity may be displayed three-dimensionally (horizontally and vertically). In this case, a computer graphic may be displayed in three-dimensional shades and colored.
Next, the operation will be described.

The radiation intensity detected by the radiation measuring means 2 provided in the measuring section 9 is transmitted from the transmitter in the form of radio waves. The position detecting means 3 includes X-axis, Y-axis, and Z-axis shown in FIG.
The current position in the coordinate of the axis is detected, and this detected position signal is transmitted from the transmitter. The radiation intensity signal and the position signal received by the receiver are given from the receiver to the calculating means 5 in the form of a pulse signal, and the calculating means 5 measures the position signal from the position detecting means 3 and the radiation measuring means 2. The radiation intensity is calculated based on the signal. As a result of the arithmetic processing by the arithmetic means 5, a radiation intensity signal per unit time at that position is obtained. It should be noted that the radiation intensity measurement at the current position is not sufficient if the sampling is performed only once, so that the average value or the maximum value is obtained by performing the sampling a plurality of times. The radiation intensity information obtained in this way is given to the display means 6 and displayed. Here, as shown in FIG. 4, assuming that the radiation source: A, the radiation source: B, and the coordinates of points P (X2, Y3, Z1), all the three-dimensional portions are displayed. Although it is the best, if the radiation intensity of the plane parallel to the floor plane of P point or the vertical plane is always shown, it is better, even if the radiation intensity of P point with the highest radiation intensity is shown. Good. If there is a specific passage or place where maintenance personnel enter to inspect equipment, piping, etc., the radiation intensity at that position will always be displayed for that specific passage or place, and an alarm will be issued if this place is dangerous. You may install an alarm that sounds.

According to the above-mentioned embodiment, since the radiation intensity at any position in the predetermined area is measured and displayed, the operator is informed in advance of the existence of the dangerous area, and when the dangerous area is present, the area range is notified. To do. As a result, the work of measuring and displaying the radiation intensity and the like is automated, so that the labor of the radiation measurement work is reduced and the distribution of the radiation intensity is clearly displayed.

Next, FIGS. 6 and 7 show a self-propelled robot type measuring unit according to a second embodiment of the present invention. In the self-propelled robot 20, a cart 31 is provided with a rod 32 that can extend and contract in the vertical direction, and a measuring unit 32 is attached to the top of the rod 32. The measuring side portion 32 includes a radiation detecting portion 34 and an extendable rod 33 that supports the radiation detecting portion 34. The rod 33 is rotatable in any rotation direction of 360 ° with respect to the carriage 31 as shown by the arrow in FIG. 7.

In the second embodiment, the trolley 31 travels to a predetermined position on the floor, the rod 32 is expanded and contracted at that position to adjust the height, and the rod 33 is rotated in an arbitrary rotation direction. The radiation detector 34 can be oriented in any direction of the X axis, Y axis, and Z axis. Therefore, it is possible to measure the radiation intensity from that direction at that position.

[0019]

As described above, according to the present invention,
In order to automatically measure and display the radiation intensity at a specific point in a specific area where the radiation source is located, the radiation intensity at the place where the worker enters is always displayed, and if it is dangerous, it is displayed. There is an effect. Therefore, there is an effect that the radiation intensity distribution can be managed. Also,
If the radiation intensity at any point in the area where the radiation source is located can be detected, there is also an effect that an abnormality of the device can be detected.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of the present invention.

FIG. 2 is a schematic side view showing a radiation intensity display device having a ceiling suspension type measurement unit according to the first embodiment of the present invention.

FIG. 3 is a schematic plan view of FIG.

FIG. 4 is an explanatory diagram showing a position of a measuring unit.

FIG. 5 is a cross-sectional view showing the structure of a radiation detection unit of the measurement unit.

FIG. 6 is a schematic side view showing a radiation intensity display device having a self-propelled robot type measurement unit according to the second embodiment of the present invention.

FIG. 7 is a schematic plan view of FIG.

[Explanation of symbols]

 1 Radiation Source 2 Radiation Measuring Means 3 Position Detection Means 4 Moving Means 5 Computing Means 6 Display Means

Claims (1)

[Claims] 1. A radiation measuring means for measuring the radiation intensity generated from a radiation source arranged in a predetermined area such as a nuclear power plant, and the radiation measuring means is mounted and is horizontal to a floor plane. X
A moving unit that is movable in at least one of the axial direction, the Y-axis direction, and the Z-axis direction perpendicular to the floor plane, a position detecting unit that detects the position of the moving unit, and a position detecting unit. A radiation intensity display device comprising: a computation unit that computes the radiation intensity near a predetermined point within a predetermined area obtained by the radiation measurement unit; and a display unit that displays the result of the computation process. .