JPH02263189A - Radiation detector - Google Patents

Abstract

PURPOSE:To obtain information from the radiation detecting surface without using a display device, etc. by constituting this detector so that a light emitting element is provided jointly between plural radiation detecting elements, and the light emitting element can emit a light beam, on the basis of a radiation detecting signal or display information. CONSTITUTION:As for this radiation detector, a semiconductor detector is provided on a substrate, a radiation detecting medium 22 consisting of a semiconductor, etc. is formed on the substrate 21, and on the radiation detecting surface 22a of the radiation detecting medium 22, plural light emitting elements 25 are provided through an insulator 24. In this state, by fetching the charge generated at the time when a radiant ray is made incident on the radiation detecting medium 22 as a radiation detecting signal, the radiant ray is detected. By selecting an arbitrary light emitting element 25 by a controller 27, sending out a light emitting signal to its light emitting element 25, and allowing its light emitting element 25 to emit a light beam, desired information is displayed on the radiation detecting surface 22a. In such a way, the measurement accuracy of a radiant ray can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention (Field of Industrial Application) The present invention relates to a radiation detector used in a radiation monitoring device installed in a nuclear facility or the like.

(Prior Art) Conventionally, radiation detectors have been used in facilities that handle radioactive materials to monitor radiation around the facility and to monitor radiation contamination of workers working in the facility.

This radiation detector consists of a radiation detection element, which is made up of a radiation detection medium that generates an electric charge when radiation is incident on it, and an electrode provided thereon, fixed on a substrate, and a lead wire that connects the electric charge generated in the radiation detection medium to the electrode. The configuration is such that the data is taken out through the cable and output to various measurement circuits.

FIGS. 5(a) and 5(b) are diagrams showing a radiation gate monitor device to which a radiation detector having the above-described configuration is applied. For example, such a gate monitor device is installed at the exit of a facility that handles radioactive materials, and monitors the radiation contamination of workers who have worked inside the facility when they leave the facility. This get monitor device has radiation detectors 2 to 9 installed on the inner wall of a monitoring room 1 at positions corresponding to the face, torso, and front and back of the torso and 1 foot of the subject M, and at positions corresponding to the top of the head and the lower part of the foot. The display panel 1 installed on the inner wall of the monitor room 1 is displayed by the person M who enters the monitor room 1.
The configuration is such that radiation measurements are performed according to the measurement operation details displayed at 0. As shown in FIG. 6, the display panel 10 includes operation instruction display lamps 11, all
Remaining time indicator 12 for displaying the time required for adjustment. An alarm position indicator lamp 1B is provided to indicate the location where radiation has been detected.

In such a gate monitor device, when the person to be measured M is contaminated with radiation, the radiation emitted from the contaminated area is detected by a radiation detector installed at a position corresponding to that area. .

This detection signal is sent to a control device (not shown), and this control device sends a command signal to the display panel 10, which lights up the alarm position display lamp 13 corresponding to the contaminated location to notify the person M of the contaminated location. .

By the way, the general display panel 10 is installed at a position corresponding to the side surface of the face of the person M to be measured.

Originally, it is desirable to install the display panel 10 in front of the face, but since it is necessary to install the radiation detector 3 in front of the face to detect contamination of the face,
It is installed on the side of the face where it is relatively easy to see.

(Problem to be solved by the invention) However, all test subjects M must often look at the display panel 10 during measurement to confirm the operating procedure, etc., and remain in a stationary state while maintaining a correct posture. It was not possible to measure radiation. As a result, there is a possibility that the measured values will have errors due to changes in posture during measurement, which is extremely high, making it impossible to obtain highly reliable measurement results. In addition, as a solution to this problem, there is an idea of transmitting information such as measurement operation procedures to the person to be measured M by voice, or in the case of voice, no information is left, so the person to be measured M cannot remember it. There is a problem in that the amount of information that can be transmitted is limited and the amount of information that can be transmitted is smaller than when the display panel 10 is used.

The present invention has been made in view of the above-mentioned circumstances, and it can be used without using a display device or the like installed separately from the radiation detector.
An object of the present invention is to provide a radiation detector that can obtain information regarding radiation detection from a radiation detection surface.

[Structure of the Invention (Means for Solving the Problems) In order to solve the above problems, the present invention provides a radiation detector that extracts charges generated by radiation incident on a radiation detection element as a radiation detection signal. A light emitting element is provided between the radiation detection element or a plurality of adjacent radiation detection elements, and the light emitting element is configured to be able to emit light based on the radiation detection signal or display information.

(Function) By taking the above-described measures, the present invention allows the electric charge generated in the radiation detection element to be extracted as a radiation detection signal when radiation is incident on the radiation detection element, and inputted into the control device together with display information, for example. Ru. Then, predetermined transmission content according to this input information is displayed by causing the radiation detection element or any light emitting element provided between the plurality of radiation detection elements to emit light.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing the configuration of a radiation detector according to an embodiment. In this radiation detector, a radiation detection medium 22 made of a semiconductor or the like is formed on a substrate 21, and lead wires 23a and 23b are connected to each electrode of this radiation detection medium 22. These lid wires 23a and 23b are for extracting charges generated in the detection medium due to the incidence of radiation as radiation detection signals. Further, a plurality of light emitting elements 25 are provided on the radiation detection surface 22a of the radiation detection medium 22 with an insulator 24 in between. Lead wires 26a and 26b are connected to each light emitting element 25, and the radiation detection surface 22
It is pulled out from the opposite side of a. Lead wires 23a drawn out from the radiation detection medium 22 and each light emitting element 25
, 23b.

26a and 26b are each connected to a control device 27.

This control device 27 has a function of controlling light emission of the light emitting element 25.

The radiation detector configured in this manner can detect radiation by extracting charges generated when radiation is incident on the radiation detection medium 22 as a radiation detection signal. Moreover, desired information can be displayed on the radiation detection surface 22a by selecting an arbitrary light emitting element 25 with the control device 27 and sending a light emitting signal to the light emitting element 25 to cause the light emitting element 25 to emit light. It is possible to add a display function to the radiation detection surface 22a.

Next, the radiation detector equipped with the above display function is displayed on the display panel 1 of the radiation gate monitor device shown in FIGS. 5 and 6.
The case where it is used as 0 will be explained. Display panel 10
operation instruction indicator lamp 11, remaining time indicator 12. Information transmission elements such as the alarm position display lamp 13 are configured by using a single light emitting element 25 or a combination of a plurality of light emitting elements 25 on the radiation detection surface 22a. The display contents of the display panel 10 are then controlled by the control device 27.

For example, when instructing a measurement operation, the control device 27 selects a light emitting element 25 for displaying the details of the operation, and transmits a light emitting signal to the selected light emitting element 25.

Then, the light emitting element 25 is caused to emit light to display the operation details. When radiation is detected by the radiation detector, a radiation detection signal is sent from the radiation detection medium 22 on which the radiation has entered to the control device 27 via the lead wires 23a and 23b. The installation position of the detected radiation detector, that is, the contaminated spot of the person M to be measured is specified, and the alarm position indicator lamp] 3 (light emitting element 25) at the position corresponding to the contaminated spot is made to emit light. Further, the control device 27 measures the time from the start of the measurement, determines the remaining time until the end of the measurement, and selects the light emitting element 25 for displaying this determined time. Then, a light emitting signal is transmitted to the selected light emitting cord 25 to cause it to emit light and display the remaining time.

In this way, by installing a radiation detector with the same display function as the display panel 10 in front of the face,
The person to be measured M can obtain various information necessary for measurement while maintaining a correct posture and remaining stationary, so that accurate radiation 711 estimations can be made and highly reliable measurement values can be obtained. can. Moreover, since the display panel 10 provided on the side of the face in the conventional device can be removed, the number of parts can be reduced and the device can be made more compact.

Next, a modification of the radiation detector in which the radiation detector has a display function as an information transmission means will be described.

The radiation detector shown in FIGS. 2(a) and 2(b) has a light emitting element 3
1 is embedded in the radiation detection medium 22. This radiation detector includes a light emitting element 3° and a radiation detection medium 22.
The radiation detection surface 22a is made into a planar shape by embedding the radiation detection surface 22 therein with an insulator 24 interposed therebetween, and furthermore, as shown in FIG. There is.

In this radiation detector, radiation is detected by extracting the charge generated when radiation is incident on the radiation detection medium 22 as a radiation detection signal. Lead wire 23a.

A control device (not shown) connected to 23b, 26a, and 26b controls the light emission of the light emitting element 31 to display desired information on the radiation detection surface 22a.

Note that although the above modification shows an example in which the light emitting elements 31 are formed in a lattice shape, they may have any shape as long as they can display desired information, such as a round shape.

FIGS. 3(a) and 3(b) are diagrams showing other modified examples, and show modified examples of a radiation detector in which a light emitting element 41 is provided on the back surface of a substrate 21 on which a radiation detection medium 22 is formed. .

That is, this radiation detector is provided with a light guide through hole 42 that penetrates the radiation detection medium 22 and the substrate 21,
The substrate 4 is arranged so as to close this light guide through hole 42.
3 is attached to the back surface of the substrate 21.

Lead wires 23a and 23b are drawn out from the radiation detection medium 221 and the light emitting element 31.

26a and 26b are connected to a control device (not shown) that controls the light emission of the light emitting element 31, so that the radiation detector has a display function.

Note that in this modification, the light guide through hole 42 has a round shape.
Although an example in which light guide grooves are provided has been shown, for example, a grid-like light guide groove as shown in FIG. 2(b) may be provided, and light emitting elements may be formed along this light guide groove.

FIGS. 4(a) and 4(b) are diagrams showing still another modification, and show a radiation detector in which a thin film on which various information is written is covered on a radiation detection surface equipped with a display function. . In addition,
In this modification, the radiation detector shown in FIGS. 2(a) and 2(b) is used as a radiation detector provided with a display function. The thin film 51 covering the radiation detection surface 22a has a thickness through which radiation can easily pass through, and the information to be displayed is written in the form of letters or pictures. Such a thin film 51 is divided into information units and arranged, for example, in each lattice area on the radiation detection surface 22a. Then, the control device 27 determines the information to be displayed, and transmits the information by causing the light emitting elements forming the grid area where the thin film 5 on which the display content is written to emit light.

According to such a radiation detector, radiation detection 1] A light emitting element 25 that covers the surface 22a with a thin film 51 written with various information and displays the thin film 51 written with desired information.
Since the information is transmitted by emitting light, more information can be displayed using a smaller number of light emitting elements than when information is displayed using the light emitting elements themselves. Furthermore, since the number of light emitting elements 25 can be reduced, the area occupied by the light emitting elements 25 on the radiation detection surface 22a can be reduced, and radiation detection efficiency can be improved.

[Effects of the Invention] As detailed above, according to the present invention, in addition to the original function of a radiation detector, a display function can be added to the radiation detection surface, and the accuracy of radiation measurement can be improved and an appropriate It is possible to provide a radiation detector that can perform monitoring and can be easily miniaturized.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the configuration of a radiation detector according to the present invention, and FIGS. 2(a) and 2(b) are views showing modified examples of the radiation detector, and FIG. ), FIG. 2(b) is a plan view as seen from the radiation detection surface side, and FIGS. 3(a) and (b) are other modified examples of the radiation detector. Fig. 3(a) is a sectional view taken along the line A-A shown in Fig. 3(b), Fig. 3(b) is a plan view seen from the radiation detection surface side, and Fig. 4 is a radiation It is a figure showing still another modification of a detector, and the same figure (a) is the same figure (
4(b) is a plan view seen from the radiation detection surface side; FIGS. 5(a) and 5(b) are schematic configuration diagrams of the radiation gate monitor device; FIG. 6 is a plan view of the display panel. 2]... Substrate, 22... Radiation detection medium, 22a.
... Radiation detection surface, 25, 31, 4] ... Light emitting element,
27...Control device, 51...Thin film. Applicant's representative Patent attorney Takehiko Suzue Figure 4 (a) (b) Funeral map

Claims (1)

[Claims] In a radiation detector that extracts a charge generated by radiation incident on a radiation detection element as a radiation detection signal, a light emitting element is provided between the radiation detection element or a plurality of adjacent radiation detection elements, and the radiation detection signal or display is A radiation detector characterized in that the light emitting element is enabled to emit light based on information.