JPS62263487A - Apparatus for measuring radiation dose - Google Patents

Abstract

PURPOSE:To eliminate a measuring error, by automatically measuring the distance from a probe to an article to be measured by a transmitting-receiving means and a distance calculation means. CONSTITUTION:An ultrasonic transmitter-receiver 7 is mounted to a probe 1 in a freely rotatable manner and emits a signal wave to an article to be measured and receives the reflected wave thereof. This receiving signal is inputted to a distance measuring circuit 8 and the distance up to the article to be measured is calculated to be informed to a measuring person by a distance display device 14 and an alarm buzzer 16. An mentioned above, a distance can be measured automatically without measuring the distance by a measure and, because the transmitter-receiver 7 can be turned to the same direction and the measuring direction of the probe 1, a measuring error generated by the measuring direction of the probe 1 is eliminated, and the reliability and accuracy to a measuring result are enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a radiation measuring device having a function of automatically measuring the distance of an object to be measured.

(Prior art) Currently, when transporting radioactive materials, safety is ensured by measuring the radiation i*m generated by the transported object and checking whether the radiation dose is within the value specified by law.゛After confirmation, transportation will be carried out. In this test, the measurement distance is 1m.
and radiation 11ffi must be measured at that distance.

FIG. 3 is a perspective view showing the appearance of a conventional radiation dose measuring device. In this figure, numeral 1 indicates a GM tube (Geiger Muller tube) that detects radiation. 2 is the main body of the radiation dose measuring device, which includes a meter 3 that displays the radiation SaW, a calibration knob 4, a switch 5 that turns on/off the jab sound that sounds every time a count is made, and a switch that resets the indicated value of the meter 3. It has a reset button 6 and the like.

In the radiation dose measurement method, first, a distance of 1 TrL from a container containing a radioactive substance (object to be measured) is measured using a measuring tape or a 1 m rod. Next, at that position, the length direction of the probe 1 is oriented perpendicularly or parallel to the measurement surface of the object to be measured, and the radiation Ii9 generated from the object to be measured is measured.

[Problem that the invention seeks to solve]

By the way, the above-mentioned measuring device has the following problems.

(2) Before measuring the radiation dose, the distance between the probe 1 and the object to be measured must be measured using a 1TrL rod or a tape measure, which is time-consuming.

■As shown in Figure 4, if probe 1 is facing diagonally towards object A, even if it measures a distance of 11L perpendicularly from the object to be measured, it will actually be the length of probe 0 - probe 1. This means that the radiation dose is being measured at a distance of Xm, which is better than 1 m, resulting in measurement errors and reducing the reliability and accuracy of the measurement results.

This invention was made in view of the above-mentioned circumstances, and its purpose is to be able to automatically measure the distance from the bulb 0-71 to the object to be measured, and to further improve the measurement error caused by the measurement direction of the bulb 0-71. The object of the present invention is to provide a radiation dose measuring device that is free from radiation.

[Means for solving problems]

This invention includes a transmitting/receiving means that is rotatably attached to a probe and emits a signal wave to an object to be measured and receives a reflected wave of the signal wave; A radiation I11 measuring device comprising a distance output means for calculating the distance to the object to be measured based on the reflected wave reflected from the object, and a notification means for notifying the measurer of the distance calculated by the distance calculation means. It is.

(Function) According to the present invention, the distance from the probe to the object to be measured is automatically measured by the transmitting/receiving means and the distance outputting means, and the measuring position is notified to the measuring person by the notifying means. This allows the release of tJ4Iffl in the correct position.
Il determination can be performed.

〔Example〕

FIG. 1 is a perspective view showing the appearance of one embodiment of the present invention, and FIG.
The figure is a block diagram showing the circuit configuration of the same embodiment. In these figures, 7 is an ffl sound wave transducer rotatably attached to the probe 1, and can be semi-fixed in the length direction of the probe 1 and in a direction rotated 90 degrees from this direction in the direction of arrow Y. It looks like this. 8 is a distance measuring circuit. In this distance measuring circuit 8, reference numeral 9 denotes a four-way transmission/reception switching circuit for switching transmission and reception of the ultrasonic transducer 7;
0 is a transmitting circuit that supplies an ultrasonic signal to the ultrasonic transducer 7 via the transmitting/receiving switching four-way 9. This transmitting circuit 10 is C
When the transmission signal P1 is supplied from the PU 13, an ultrasonic signal is output. A receiving circuit 11 is supplied with received waves from the ultrasonic transducer 7 via the transmission/reception switching circuit 8, and upon receiving the received waves, outputs a received signal P2 to the CPU 13 and the distance counting circuit 12. The distance counting circuit 12 is composed of a pulse generator that generates clock pulses and a counter.
Upon receiving the transmission signal P1 output from the CPU 13, it starts counting clock pulses output from the pulse generator. Furthermore, upon receiving the reception signal P2, it stops counting and supplies this count data to CPtJ13. The CPU 13 performs υltE on each part of the circuit, and outputs the transmission signal P1 at a period of 1 second. 14 is a distance indicator that digitally displays the distance measured by the distance measuring circuit 8;
15 is a distance setting unit for setting a distance between 0 and 2 m. 16 is a notification pad, which is an output signal P3 of the CPU 13.
It rings when received. 16 is a power switch. Further, reference numeral 18 denotes an emission measurement circuit, and 1 to 6 are the same as those shown in FIG. 3, and the explanation thereof will be omitted.

In the above configuration, the measurer first sets the set distance to 1 m in the distance 11iQ constant section. Next, for example, the length direction of the probe 1 is directed toward the object to be measured, the ultrasonic transducer 7 is semi-fixed in parallel to the length direction of the probe 1, and the power switch 17 is turned on. W1′I! When the A switch 17 is turned on, the CPU 13 sends signals to the transmitting circuit 10 and the distance counting circuit 12.
A transmission signal P1 is supplied to the terminal every second. When the transmission signal P1 is supplied to the transmission circuit 10, the transmission circuit 10 supplies the ultrasound signal to the ultrasound transducer 7 via the transmission/reception switching port ff19.

When the ultrasonic transducer 7 receives the la sound wave signal, it emits ultrasonic waves to the outside. At this time, the distance counting circuit 12 starts counting. The ultrasonic wave emitted from the ultrasonic transducer 7 is reflected by the object to be measured, and this reflected wave is received by the ultrasonic transducer 7 again. The ultrasonic transducer 7 that has received this reflected wave transmits the signal via the transmission/reception switching circuit 9.
A received wave is supplied to the receiving circuit 11. The receiving circuit 11 receives the received wave and supplies a received signal P2 to the distance counting circuit 12 and cpul 3. When the distance counting circuit 12 receives the reception signal P2, it stops counting. The count data at this time is data corresponding to the distance from the ultrasonic transducer 7 to the object to be measured, and this count data is supplied to the CPU 13. When the CPLJ 13 receives the count data, it displays this count data on the distance display 14, and also compares the set distance set in the distance setting section 15 with the count data, and if both data match, ,
A signal P3 is supplied to the notification buzzer 16. This causes the notification buzzer 16 to sound. If both data do not match, the CPU 13 does not output the signal P3 and the notification buzzer 1 is activated.
6 does not ring.

Thus, the above-described operation is repeated every second. That is, the distance between the object to be measured and the probe 1 is automatically measured every second, and the measurement result is displayed on the distance display 14. Then, when the measurer moves and the distance reaches the set distance, the notification buzzer 16 sounds. Further, in the radiation i measurement circuit 18, the radiation dose detected by the probe 1 is constantly measured. As a result, the emitted onam from the object to be measured is displayed on the meter 3 at a position im from the object to be measured where the notification buzzer 16 has sounded.

In the above embodiment, the radiation dose of the object to be measured in the length direction of the probes 0-11 is measured, but the probe 1 is oriented parallel to the object to be measured, and the ultrasonic transducer 7 is The radiation dose may be measured by rotating it in the direction of the arrow Y in the figure and semi-fixing it at right angles to the probe 1 to measure the distance to the object to be measured.

According to this embodiment, the distance measurement is automatically performed, and at the same time, the radiation I1m can be measured in the same direction in which the distance measurement was performed. Further, according to this embodiment, not only the measurement staff who performs the measurement but also the inspectors present can be alerted by the alarm buzzer 16 to
It is possible to tell the distance of the test and make it clear that there is no fraud in the test.

In the above embodiment, an ultrasonic sensor is used for distance measurement, but a photoelectric sensor such as an automatic focus sensor used in a camera or the like may also be used.

〔Effect of the invention〕

As explained above, according to the present invention, the transmitting/receiving means is rotatably attached to the plow 7 and emits a signal wave to the object to be measured and receives a reflected wave of the signal wave; a distance calculating means for driving the means and calculating the distance to the object to be measured based on the reflected wave detected by the transmitting/receiving means; and a notifying means for notifying the measurer of the distance calculated by the distance calculating means. Since it is equipped with this, it is possible to automatically measure the distance without measuring the distance with a measuring tape or a 1m stick, etc. Also, according to the present invention, since the transmitting and receiving means can be oriented in the same direction as the measuring direction of the prog 1, Measurement errors caused by the measurement direction of the probe 0-71 are eliminated, and as a result, the reliability and accuracy of radiation dose measurement results are improved.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the appearance of one embodiment of the present invention, and FIG.
FIG. 3 is a block diagram showing the circuit configuration of the same embodiment, FIG. 3 is a perspective view showing the configuration of a conventional radiation measuring device, and FIG. 4 is a diagram showing an example of measurement in the conventional radiation measuring device. 1...Probe, 7...Ultrasonic transducer, 8...Distance measurement circuit, 14...Distance indicator, 16...・Notification buzzer. Applicant Mitsubishi Nuclear Fuel Co., Ltd. Figure 4

Claims (1)

[Scope of Claims] A radiation dose measuring device having a probe for detecting radiation, which is rotatably attached to the probe, emits a signal wave to an object to be measured, and receives a reflected wave of the signal wave. a transmitting/receiving means; a distance calculating means for driving the transmitting/receiving means and calculating a distance to a measured object based on a reflected wave detected by the transmitting/receiving means; A radiation dose measuring device comprising: a notification means for notifying.