JPS62245987A - Check system for counting function of radiation dosimeter - Google Patents

Abstract

PURPOSE:To secure the safety of a counting function check on a radiation dosimeter by measuring the dosage of natural radiation during the charging of a storage battery, and comparing the measured value with a specific value and thus checking the counting function. CONSTITUTION:When a connector 7 is connected to a charger, the storage battery 8 begins to be charged and a signal 7a is inputted from the connector 7 to an input circuit 6; and a CPU 5 judges that the storage battery is being charged from information on the circuit and then resets the contents of a counter 3 and also starts the clocking operation of specific time tau. The CPU 5 leaves the counter 3 in operation even after resetting the counter 3, so the counter 3 counts pulses based upon natural radiation inputted through a radiation detecting means 15. When a timer 4 sends out a time-up signal the time tau later, the CPU 5 reads the contents N of the counter 3 out and compares them with a set value N0 set in a ROM 9. Then, a warning indicating that the counting function of the dosimeter is abnormal is outputted 14 after the signal 7a is ceased unless N>=N0.

Description

[Detailed Description of the Invention] [Technical field to which the invention pertains] The present invention relates to a method for checking the counting function of a radiation dosimeter that measures radiation doses, and in particular to a method for checking the counting function of a radiation dosimeter that makes the checking operation safe, easy, and economical. Concerning methods that can be carried out for the whole.

[Prior art and its problems]

FIG. 3 is a block diagram of a conventional radiation ml nursery meter.

In the figure, at C, the radiation is converted by the radiation detection means 15 into an electric pulse signal 15a whose pulse frequency corresponds to m1 of the radiation. This signal 15a is then counted and integrated by the counter 3, and the result of this integration is displayed on the display 12 as a radiation dose. Also counter 3V
The integrated value according to c is compared with a preset value in the comparison means 17, and when the integrated value exceeds the set value, the buzzer 14 is activated to indicate that the radiation am has exceeded the specified value. It is designed to notify users of the

Now, when checking the counting function of such a radiation dosimeter, conventionally, a reference radiation source for checking is used,
This radiation #[is sometimes measured in the same way as above and compared with a reference value, but this checking method has the problem that the reference radiation source is generally expensive. Another problem is that sufficient consideration must be given to safety when handling the dam. koroO
Therefore, instead of the reference radiation source, a pseudo pulse generating means that is inexpensive and easy to handle is provided, and the electrical pulse signal output by this means is input to the counter 3 to check the counting function of the radiation dosimeter. (Special application Showa f'1
However, such a check method has a problem in that the function of the radiation detection means 15 cannot be checked.

[Purpose of the invention]

The present invention solves the problems of the conventional method as described above, and makes it possible to check the radiation dose extremely safely, easily, and economically for the entire radiation dosimeter including the radiation ejecting means. The purpose of this paper is to provide a method for checking the counting function of a meter.

[Key points of the invention]

In order to achieve the above object, the present invention provides a radiation #
In the iA information meter, natural radiation is measured while the storage battery is being charged, and the counting function rO is checked by comparing this measured value with a predetermined value. Safely, easily and economically without the use of special pulse generation means such as radiation detection means! This provides a radiation dosimeter counting function check method that can check the entire li1gt meter.

[Embodiments of the invention]

FIG. 1 is a 70-chart for detailed explanation of the present invention, and this figure shows the measurement operation and counting function check operation of the radiation dosimeter shown in FIG. 2 with the IC configuration. In Fig. 2, 1 is a radiation detector, 2 is an amplification-wave height discriminator, 3 is a counter, 4 is a timer, 5 is a central processing unit (CPU) in a microcomputer, 6 is an input circuit, and 7 is a A charging connector, 8 a storage battery, 9 a read-only memory (ROM), 10 a random access memory (RAM), 11 a display circuit, 12 a display, 13 an output circuit, and 14 a buzzer. The radiation detection means 15 is composed of a radiation detector 1 and an amplified threat wave height discriminator 2. 7a is a signal that is output when the connector 7 is connected to a charger (not shown), and 8a is a power supply line that supplies v1# from the storage battery 8 to each part shown.

First, the measurement operation of the radiation dosimeter shown in FIG. 2 will be explained. That is, the detector 1 detects radiation and outputs a minute pulse signal 1a. This pulse signal is converted into a countable bus JLt bus signal 15a by the amplification/wave height discriminator 2, and then integrated and counted by the counter 3. This count value N is read out from the CPU 5IC and sent to the display circuit 11 as display data, and this is Ifj! It is displayed on the display 12 as a quantity value. The CPU 5 outputs this count value N as RO.
Alarm setting value N preset in M9 or RAMl0.

The output circuit 13 is operated when the count value N, which is the content of the counter 3, is larger than the value N of the counter 3.

The buzzer 14 is activated to issue an alarm.

Next, the checking operation of the counting function of the radiation dosimeter shown in FIG. 2 will be explained with reference to FIG. 1 as well. ■ in Figure 1
shows the series of measurement operations described above.

When the charging connector 7 is not connected to a charger (not shown), the signal 7a is not output.

The radiation dosimeter is performing the measurement operation shown in (Fig. 1).
reference). Now, when the connector 7 is connected to the charger,
Charging of the storage VIL battery 8 is started, and a signal 7a indicating that charging is in progress is input from the connector 7 to the input circuit 6. Then, the CPU 5 determines that charging is in progress based on the information from the input circuit 6 (see Figure 1 ■), and resets the contents of the counter 3 (the CPU 5 keeps the counter in the operating state even after resetting the counter 3 in ■). Therefore, the counter 3 then counts the pulses due to natural radiation inputted via the radiation detection means 15 (see 2).When the time τ ends and the timer 4 outputs a time-up signal (see 2) ), the CPU 5 reads the content N of the counter 3F1 and sets it to the preset value N in R, OM 9.
(See the same ■) Then, here NΣN. If not, the process branches to step (2), waits for the charging signal 7a to disappear, and outputs an alarm indicating that there is an abnormality in the counting function of the dosimeter (see step (2), [phase]). The set value N0 of the number of pulses is usually set to about several pulses when the above-mentioned time τ is one hour. N Engineering N. The reason for outputting an alarm when the failure occurs in radiation dosimeters is that when a failure occurs in a radiation dosimeter, the count value N generally tends to become small. This is because such a dosimeter is a practically safe dosimeter even if it occurs in the dosimeter.The setting of the above set value N0 is as follows.
It also means that the sensitivity of the dosimeter is set so that if the dosimeter has no abnormality in its counting function, it can count more than IcNo pulses of natural radiation in one hour.

Now, as described above, the CPU 5 outputs an alarm in step [phase]. In other words, at the same time that the wire ii+tt is removed from the charger and the charging signal 7a disappears, the buzzer 14 is activated via the output circuit 13 to notify that there is an abnormality before starting to use the dosimeter. It is something. Of course, it is also possible to sound the buzzer 14 during charging, and depending on the situation, it is also possible to display an abnormality on the display L2. Usually, multiple dosimeters (50
~100) Since both are performed at the same time, it is easier and more practical to sound the buzzer when the dosimeter is removed from the charger, making it easier to identify the abnormal dosimeter.

In Figure 1 ■, N and No are compared, and this σ] result N
: 4N, the dosimeter is judged to be normal for the above-mentioned reason. Therefore, in this case, the CPU 5 resets the contents of the counter 3 (see Figure 1 ■) and waits until the charging signal 7a disappears (see Figure 1), in other words, the photoelectric connector 7 and the charger are disconnected. Wait until then and move on to Moe's measurement operation (see ■).

In the IT meter of FIG. 2, its counting function is checked using natural radiation as described above.

Therefore, such a checking method does not use a special radiation source, so it is extremely safe and economical, and the checking work is easy. According to such a method, the counting function of the entire radiation dosimeter including the radiation detection means 15 is checked.

〔Effect of the invention〕

As mentioned above, in the present invention, 1RLT in the storage battery
) The radiation dosimeter measures natural radiation while the storage battery is being charged, and the counting function is checked by comparing this measured value with a predetermined value. Therefore, according to such a checking method, there is no need to use a special pulse generating means such as a reference radiation source or a pseudo pulse generating means, so that the counting function of the radiation dosimeter can be checked safely, easily, and economically. effective. Further, in the present invention, since natural radiation is measured via the radiation detection means in the radiation dosimeter, there is an effect that the counting function of the entire radiation dosimeter including the detection means can be checked. Further, according to the present invention, a counting function check is performed before using the #I quantity magnetic needle r'J, so such a check method has the effect of eliminating the need to use the dosimeter in a malfunctioning state.

[Brief explanation of drawings]

Figure 1 is a 70-chart for detailed explanation of the invention;
The figure shows radiation #a operating according to the 70-chart in Figure 1.
Coulometer Configuration Diagram, FIG. 3 is a configuration diagram of a conventional radiation dosimeter. 8...Storage battery, 15...Radiation detection means, L5a...Pulse signal.礪 1 目′＠ 2 口gun 3 Figure

Claims (1)

[Claims] In a radiation dosimeter with a built-in storage battery that measures the radiation dose by counting pulse signals from a radiation detection means, by measuring the dose of natural radiation while the storage battery is being charged, and comparing this measured value with a predetermined value. A radiation dosimeter counting function check method characterized by checking the counting function.