JPH0321885A - Radiation measuring instrument - Google Patents

Abstract

PURPOSE:To obtain high reliability by updating a display value at specific intervals of time according to the value of a measurement signal unless a warning signal is outputted, and updating the display value immediately when the warning signal is outputted and updating a fixed-state display value again thereafter. CONSTITUTION:When a warning circuit 5 outputs no warning signal and an output binary signal 5a is at L level, a timer 14 performs fixed-state repetitive clocking operation and an OR circuit 15 outputs a display value update command signal 15a by the output of a signal 14a from the timer 14 at time intervals, so that the display value A of the dosage rate of radiation 2 on a display device 10 is updated. When a warning signal 5a1 is inputted to a detecting circuit 13, the display value A is updated. When a warning part 7 outputs a warning signal, the display value on the display part 17 is updated immediately to a value corresponding to the current value of a measurement signal. Therefore, the display part displays a value larger than a display value As corresponding to a warning set value B and the warning part 7 never outputs the warning signal unless the display part A on the display part exceeds the display value As, so that the radiation measuring instrument with high reliability is obtained.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a radiation measuring device that measures the dose rate of radiation and performs display and alarm operations, and particularly relates to a measuring device that provides highly reliable dose rate display values.

[Conventional technology]

Figure 3 shows the configuration of a conventional radiation measuring device. In the figure, 1 is a radiation detection unit that detects incident radiation wA2 and outputs a detection signal 1a in the form of an analog signal or pulse train signal according to the detection result, and 3 is a predetermined signal for the manually input detection signal 1a. A signal processing section that performs processing and outputs a measurement signal 3a which is an analog voltage signal corresponding to the dose rate of the radiation 2; 4 is a measurement section consisting of a detection section 1 and a signal processing section 3; 5 is an alarm setting device 6 When the alarm setting signal 6a outputted by the alarm setting signal 6a and the above-mentioned measurement signal 3a are input, and the value of the signal 3a exceeds the value B of the signal 6a, the binary signal 5 becomes H level.
an alarm circuit that outputs a, 7 is an alarm circuit 5 and an alarm setting device 6
This is an alarm unit consisting of. Since the alarm section 7 is configured as described above, when the value of the measurement signal 3a exceeds the predetermined alarm setting value B, the alarm section 7 sends the H level signal 5a to the alarm signal 5a.
It can be said that it is an alarm unit that outputs as l. 8
9 is a timer configured to output a pulse-like display value update command signal 8a every time a predetermined time τ elapses, and 9 is a timer that constantly inputs the measurement signal 3a and holds the value of the signal 3a when the command signal 8a is input manually. A display control circuit outputs a digital code signal 9a according to the held value, 10 is a display device that displays a display according to the manually input digital code signal 9a, and 11 is a timer 8, a control circuit 9, and a display 10. This is a display section consisting of. In the display unit 11, a control circuit is provided so that the dose rate of the radiation 2 represented by the measurement signal 3a is displayed on the display IO, and the display value A of the display device 0 is updated every time the signal 8a is output from the timer 8. 9 are configured. Reference numeral 12 denotes a radiation measuring instrument consisting of the various parts shown in the figure. Since the measuring device 12 is configured as described above, the alarm signal 5al indicates that the dose rate of the radiation 2 detected by the detector 1 has become equal to or higher than the dose rate corresponding to the set value B indicated by the alarm setting signal 6a. In addition, in the measuring instrument engineer 2, the time interval τ of the timer output signal 8a is set to 1 second, so even if the value of the measurement signal 3a fluctuates drastically, the radiation 2 displayed on the display 10 will not change. It is clear that the dose rate display value A can be read satisfactorily by humans.

[Question B that the invention attempts to solve]

Since the measuring device 12 operates as described above, now at time t1
The signal 8a is input to the display control circuit 9 and the display value A of the display 10 is updated to A1, but at time 10, before the time τ11 seconds has elapsed, the value of the signal 3a exceeds the value B of the signal 6a. Then, a signal 5al is output from the alarm circuit 5, but the displayed value A when this signal 5al is output is A, which corresponds to the value of the signal 3a at time t1.
, is a value lower than the dose rate display value As corresponding to the value B of the setting signal 6a. Therefore, the value of the signal 3a, which became equal to or higher than B at time 10, becomes smaller after time 10, and at time tl
If the value becomes lower than B again at time t2 when time τ has passed since then, the displayed value A at time t2 becomes
It is clear that this A2 is a displayed value that is lower than As. In other words, in the measuring instrument 12, the display value A on the display 1o
is updated every 1 second, so the value of signal 3a changes to alarm set value B within 1 second after display value A is updated.
If a phenomenon occurs in which the value exceeds B and then falls below B again, an alarm signal 5al will be output from the circuit 5 even though the displayed value A does not exceed the alarm setting dose rate display value As, and therefore the radiation The measuring device 12 has a problem in that the reliability of the displayed value A is low. An object of the present invention is to update the displayed value A of the display 10 immediately when the value of the signal 3a exceeds the value B of the signal 6a and the signal 5al is output from the alarm circuit 5, thereby achieving high reliability. The purpose is to enable display value A to be obtained.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a measurement unit that measures the dose rate of radiation and outputs a measurement signal according to the result, and a measurement unit that measures the radiation dose rate and outputs a measurement signal according to the result, and when the value of the measurement signal exceeds a predetermined alarm setting value. an alarm unit that outputs an alarm signal; and a constant display value update operation that updates a display value at predetermined time intervals to a value corresponding to the value of the measurement signal if the alarm signal is not output from the alarm unit; a display section that immediately updates the display value to a value corresponding to the value of the measurement signal when the alarm signal is output from the alarm section, and then performs the operation of updating the steady-state display value again, The radiation measuring device is arranged to measure the dose rate based on the above.

[For use]

If you take precautions as described above, when the alarm signal is output from the alarm section, the displayed value on the display section will be immediately updated to a value corresponding to the value of the measurement signal at that time, so at this time, the display section will display the above alarm settings. Since a value greater than or equal to the display value As corresponding to value B is displayed, the alarm signal is almost never output from the alarm section even though the display value A on the display section does not exceed As. A radiation measuring instrument with highly reliable values can be obtained.

【Example】

FIG. 1 is a composition diagram of an embodiment of the present invention. The difference between this diagram and FIG. When reaching the H level, the first signal 13a and the second signal 13a, both of which are pulse-like, are
The alarm signal detection circuit 13 outputs a signal 13b, and normally performs a regular repeating timekeeping operation that outputs a pulse-like signal 14a every time a predetermined time τ elapses, and when the signal 13b is input manually, it measures the time at that time. A timer 14 corresponding to the above-mentioned timer 8, whose contents are reset and restarts the above-mentioned regular repeating timekeeping operation, and a signal 13
an OR circuit 15 which receives input signals 14a and 14a and outputs a pulsed signal 15a corresponding to the logical sum of these human input signals as a display value update command signal, and a constant measurement signal 3a.
is input and command signal 15a is input, signal 3a
The above-mentioned code signal 9 is held in accordance with this held value.
By providing a display control circuit 16 corresponding to the above-mentioned display control circuit 9, which outputs 17
is a display section consisting of the above-mentioned display 10, the above-mentioned alarm signal circuit 13, timer 14, OR circuit 15, and display control circuit 16. Further, 18 is a radiation measuring device consisting of the various parts shown in the figure. Next, the operation of the radiation measuring device 18 will be explained with reference to the main waveform diagram shown in FIG. 2. That is, Figures 1 and 2
In the figure, when the alarm signal 5al is not output from the alarm circuit 5 and the output value signal 5a is at the L level, the timer 14 is performing a steady-state repetitive timing operation, and therefore the time τ has elapsed. For example, when the signal 14a is output from the timer 14 at each time such as t3 and t4, the display value update command signal 15a is output from the OR circuit 15, and the display value of the dose rate of the radiation 2 on the display 10 is changed. A is at time t3. Although it is updated every t4, for example, if the value of the measurement signal 3a crosses the value B of the alarm setting signal 6a upward at time t5, when time τ has not elapsed since time t4, at this time, the alarm signal from the circuit 5 is 5al is output, the detection circuit 13 outputs the signal 13a, and as a result, the signal 15a is input to the detection circuit 16, and the display value A3 on the display 10 becomes the signal 3a at the time when the signal 15a was input to the circuit 16. Display value A corresponding to the value of
Updated to 4. In this case, the so-called delay time T from when the signal 5al is output from the alarm circuit 5 until the value of the signal 3a is held in the control circuit 16 is 10 [
This is an extremely short time compared to the time of τ-1 [S] on the order of μS]. Therefore, in the radiation measuring device 18,
Immediately after the signal 5al is output from the alarm unit 7, the display I
It can be said that the displayed value A at O is updated to a value corresponding to the value of the signal 3a at that time. Now, in the radiation measuring instrument 18, when the alarm signal 5al is input to the detection circuit l3, the display value A is updated as described above, but at this time, the signal 13b is manually input to the timer 14, so at this signal input time. As a result of the timing contents of the timer 14 being remoted and the steady-state repeating timing operation of the timer 14 being restarted, from time t5 onwards, t6. The display value A is updated every time a time τ such as t7 has elapsed, and the timer 14 is updated at time t8, which is a time between time L5 and time t6 and after a time τ has elapsed from time t4.
The signal 14a is not applied. therefore,
Now, if we refer to the updating operation of the display value A based on the steady state repeated time counting operation of the timer 14 as the steady state display value updating operation, the display section 17 will display the displayed value when the alarm signal 5al is not output from the alarm section 7. A is measured as signal 3 every predetermined time τ.
A constant display value updating operation is performed to update the value according to the value of a, and when the signal 5al is output from the alarm unit 7, the display value A is immediately updated to the value corresponding to the value of the signal 3a at that time. It can be said that the regular display value updating operation is performed again. Since the configuration and operation of the radiation measuring device 18 are as described above, the above-mentioned emergency starts from time t5 in FIG. 2 when the value of the measurement signal 3a crosses the value B of the setting signal 6a upward Unless the value of the signal 3a falls below B before the short delay time T elapses, the display 10 will display the display value A corresponding to the value of the signal 3a immediately after time t5, and this display It is clear that the value A is greater than the display value As corresponding to the value B of the signal 6a. Therefore, according to the radiation measuring device 18, the displayed value A
Alarm signal 5al is issued from alarm unit 7 even though the value does not exceed As.
Since there are almost no cases where the value A is output, a highly reliable display value A can be obtained.

【Effect of the invention】

As mentioned above, in the present invention, radiation! A measuring section that measures the S amount rate and outputs a measurement signal according to the result; an alarm section that outputs an alarm signal when the value of this measurement signal exceeds a predetermined alarm setting value; and an alarm section that outputs an alarm signal. If the display value is not output, the display value is updated at predetermined time intervals to a value corresponding to the value of the measurement signal.The display value is updated to the value of the measurement signal as soon as the alarm signal is output from the alarm unit. The radiation measuring device is equipped with a display section that updates the display value to a value corresponding to the display value and then performs the operation of updating the steady state display value again thereafter, and the radiation measuring instrument is configured to measure the radiation dose rate based on the display value. Therefore, with the above configuration, when the alarm signal is output from the alarm section, the displayed value on the display section is immediately updated to a value corresponding to the value of the measurement signal at that time, so that the display section at this time is updated to the value corresponding to the value of the measurement signal at that time. The alarm signal is almost no longer output from the alarm unit even though the display value A on the display unit does not exceed As when the display value A corresponding to the alarm set value B of the display unit is displayed. Therefore, the present invention has the effect of providing a radiation measuring device with highly reliable displayed values.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of an embodiment of the present invention, FIG. 2 is a diagram illustrating waveforms of the main parts in FIG. 1, and FIG. 3 is a diagram showing the configuration of a conventional radiation measuring instrument.

Claims (1)

[Claims] 1) A measurement unit that measures the dose rate of radiation and outputs a measurement signal according to the result, an alarm unit that outputs an alarm signal when the value of the measurement signal exceeds a predetermined alarm setting value, and the alarm unit If the alarm signal is not output from the alarm unit, a constant display value updating operation is performed to update the display value to a value corresponding to the value of the measurement signal at predetermined time intervals, and when the alarm signal is output from the alarm unit. and a display unit that immediately updates the displayed value to a value corresponding to the value of the measurement signal and thereafter performs the steady-state display value updating operation again, and measures the dose rate based on the displayed value. A radiation measuring device.