JPS60108783A - Radiation monitor system - Google Patents

Abstract

PURPOSE:To elevate accuracy by a method wherein the radiation dose detected from a detector section and a environment condition data are processed to be sent to a transmission path, the radiation dose is corrected by the data with a measuring section to send a required data to the detector section while the output data is displayed. CONSTITUTION:Data on radiation, temperature and power source voltage obtained at a detector section 8 is memorized into a data processing circuit 7 while converted into a serial data and sent to a data processing circuit 14 of a measuring section 15 through a transmitter section 9. The circuit 14 also sends a temperature correction signal obtained after a temperature data is sent to a detector correction setter 10 to a high voltage generator 4 of the detector section 8 to correct temperature changes of the detector section 8 as a whole. In addition, the dose rate and integrated dose value are displayed at a data output section 11. Then, to confirm the characteristic of a radiation detector 1, a high voltage setter 12 is used to set the high voltage generator 4 while the drop in the counting level and abnormality of the power source are detected with a counting/ power source abnormality setter 13.

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention relates to a radiation detection unit and a measurement unit located at a remote location, which are connected through a transmission line to enable radiation measurement from a remote location. This relates to a monitor system.

[Prior art and its problems]

In such a conventional radiation monitoring system, only the signal extracted by the detection section, that is, the detected radiation data value, is transmitted to the measurement section in the form of a continuous signal consisting of direct current or pulses. For this reason, there were the following problems.

The first problem is temperature correction for detected data. This will be explained below.

If the detection unit has a built-in high-voltage power supply, a correction circuit is built into the high-voltage power supply circuit or the preamplifier circuit connected to the detector to compensate for the temperature characteristics of the detector in the detection unit. However, it is difficult to perform temperature correction with high accuracy over a wide range of temperature changes using these five means.

In addition, the data signal from the detection section is transmitted to the measurement section in the form of direct current or linear pulses, and the measurement section receives the transmitted signal and performs analog measurement. As for temperature characteristics,
In addition to the temperature characteristics at the detection section, the temperature characteristics at the measurement section must also be taken into account, but conventionally, as mentioned above, only the temperature characteristics were corrected at the detection section. Therefore, there is a problem that the temperature characteristics are not sufficiently corrected and the accuracy of the measured data is low.

The second problem is the problem of confirming whether or not the required high-voltage power source and low-voltage power source in the detection section are operating normally.

When supplying the required high-voltage power and low-voltage power to the detection unit from the measurement unit, it is not possible to accurately determine whether or not the detection unit is receiving normal power unless the detection unit constantly measures the power. However, in the past, radiation monitoring systems were only measured and confirmed when they were installed or inspected, so it was unclear whether power was always being supplied normally during the measurement period, and as a result, There is a problem that the reliability of measurement data is low.

Incorporating the necessary power supply into the detection section eliminates the need for a power supply cable from the measurement section to the detection section, increasing the reliability of the power supply, but on the other hand, the power supply voltage can be variably controlled from the measurement section side. This causes problems such as the inability to perform detector characteristic tests.

[Purpose of the invention]

The present invention has been made in order to solve the problems of the prior art as described above, and therefore, it is an object of the present invention to enable sufficient temperature correction for detected data and to improve the operation of the power supply during the measurement period. It is possible to check the state of radiation, thereby improving the accuracy and reliability of detected data, and also allowing variable control of the power supply voltage in the detection unit from the measurement unit side as necessary. Our goal is to provide a monitoring system.

[Key points of the invention]

The main point of this invention is to provide a radiation detector, a temperature detector, and a data processing circuit in the detection section, convert the detected radiation data, temperature data, power supply voltage data, etc. into digital codes, and transmit them to the measurement section via a transmission path. This enables mutual data communication, and the measurement unit processes the received data in a digital processing circuit to perform temperature correction,
The aim is to improve the accuracy and reliability of the monitor by obtaining radiation measurement data that has been subjected to necessary corrections such as power supply voltage correction.

[Embodiments of the invention]

The present invention will now be described in detail with reference to the drawings.

Figure wc1 is a block diagram showing an embodiment of the present invention.

In the figure, 1 is a radiation detector, 2 is an amplifier, 3 is a temperature detector, 4 is a high voltage generator, 5 is a voltage divider, 6 is a low voltage power supply output, 7 is a data processing circuit, 8 is a detection section, 9 1 is a transmission section, 10 is a detector correction setting device, 11 is a data output section, 1
2 is a high voltage setting device, 13 is a counter, a power supply abnormality setting device, 14 is a data processing circuit, 15 is a measuring section, 16 is an abnormal level detection display, and 17 is a voltage monitoring line.

Please refer to FIG. This monitor system can be roughly divided into a detection section 8 and a measurement section 15, and is composed of both of them. In the detection unit 8, the radiation detector 1 converts the detected radiation into an electrical signal, which is amplified by the amplifier 2, and then sent as a pulse signal to a microcomputer built in the data processing circuit 7.

The temperature inside the detection unit 8 is detected by the temperature detector 3, and after being converted into a digital value by an A/D converter (not shown) provided outside the microcomputer or an A/D converter inside the microcomputer, the temperature is converted into a digital value. Make me remember.

The high-voltage power supply applied to the detector 1 is generated by the high-voltage generating circuit 4, and this is supplied to the detector 1 as a constant voltage. It can be changed by. The output of the high voltage generation circuit 4 is supplied to the radiation detector 1, and at the same time is divided by the voltage divider 5 and converted into a low voltage output. Or, after being converted into a digital value by an A/D converter inside the microcomputer, it is stored in the data processing circuit 7.

Further, the output 6 of the low voltage power supply supplied to the detection section 8 is also stored as a digital value in the data processing circuit 7 in the same manner as described above.

The data regarding radiation, temperature, and power supply voltage obtained in this way by the detection unit 8 is stored in the data processing circuit 7,
The data is converted into serial output data and transmitted to the measurement section 15 via the transmission section 9 by wire, optical transmission, or wirelessly.

Further, the transmitting section 9 is constituted by a reciprocating transmission means so that the control signal can be transmitted from the measuring section 15 to the detecting section 8 by the above-mentioned transmitting section 9.

The measuring section 15 receives serial signal data from the detecting section 8, and the data processing circuit 14 performs the following processing by a microcomputer.

(b) The temperature data in the detection unit 8 is transferred to the data processing circuit 1
4 and has the same temperature characteristics as the radiation detector 1! A temperature correction signal obtained by passing temperature data through a detector correction setting device 10 having RF characteristics is sent to the detection section 8 via a data processing circuit 14 and a transmission section 9, and a high voltage signal is sent from the data processing circuit 7 to the detection section 8. By sending a correction signal to the generator 4 and controlling the high-pressure generator 4, the high-voltage output supplied to the radiation detector 1 is varied, responding to temperature changes in the entire detection section 8 including the detector 1. Supplementary information can be implemented.

(b) The radiation output data from the detection unit 8 is processed by the data processing circuit 14 in the measurement unit 15, and the dose rate and integrated dose value are digitally displayed in the data output unit 11,
(c) Generator 4 in the detection unit 8 The high voltage setting device 12 in the measuring section 15 can be used to freely set the high voltage power generated from the high voltage power supply according to the voltage setting during normal measurement, special variable voltage setting for checking the characteristics of the detector 1, etc. It can be applied to the high voltage generator 4 via the data processing circuit 14, transmission section 9, and data processing circuit 7.

(d) Radiation count value in the detection unit 8, high voltage power supply output,
Since the low-voltage power supply output etc. can be obtained as a digital value in the data output unit 11 of the measurement unit 15, the counting and power supply abnormality setting device 13
Using this method, when the counting level decreases, if the high or low voltage power source is higher or lower than the predetermined set value, it can be detected as an abnormal output.

As mentioned above, all the data obtained by the detection unit 8 is transferred to the measurement unit 1.
5 and can be monitored and controlled by the measuring section 15. In addition, the control signal from the measuring section 15 is fed back to the detecting section 8.
It is possible to stabilize the monitor. Furthermore, the power supply check of the detection section 8 can also be monitored from the measurement section 15 side, and if an abnormality occurs, the abnormality level detection display 16 can be operated and displayed.

FIG. 2 is a flowchart showing the flow of processing operations by the data processing circuit 7 on the detecting section 8 side.

FIG. 3 is a flowchart showing the flow of processing operations by the data processing circuit 14 on the measuring section 15 side.

There is no need to explain these flowcharts again. Figure 4 is a flowchart showing the flow of operations during data transmission between the detection section 8 and the measurement section 15.
The figure is also a timing chart of the operation.

Each step A-D in FIG. 4 corresponds to a timing period A-D in FIG. 4A, respectively. There is no need to explain these figures again.

FIG. 5(a) is an explanatory diagram showing the transmission format of serial data from the measuring section 15 to the detecting section 8, and FIG. 5(b) is an explanatory diagram showing the transmitting format of serial data from the detecting section 8 to the measuring section 15. It is a diagram.

In these figures, 2 is a start bit, b is a machine number bit, C is a dose data bit, company d temperature data bit, C is a power supply data bit, f is a setting data bit, and g is an end bit.

〔Effect of the invention〕

According to this invention, the detection section is equipped with a radiation detector, a temperature detector, a high voltage power supply, etc., the data obtained by these is digitized and sent to the measurement section, and the measurement section also sends necessary data to the detection section. This has the advantage that the accuracy and reliability of the detected data can be improved because the measuring section performs temperature correction of radiation detection data, power supply abnormality monitoring, etc. in the measuring section.

[Brief explanation of the drawing]

1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a flowchart showing the flow of the operation on the detecting section 8 side in FIG. 1, and FIG. Flowchart showing the flow of the operation, FIG. 4 is a flowchart showing the flow of the operation during data transmission between the detection section 8 and the measurement section 15, FIG. 4A is a timing chart of the operation, and FIG. FIG. 5(B) is an explanatory diagram showing a data transmission format from the detection part to the measurement part. Code explanation 1...Radiation detector, 2...Amplifier,
3...Temperature detector, 4...High voltage generator, Voltage divider, 6...Low voltage power supply output, 7... Data processing circuit, 8...detection section, 9...transmission section, 10...detector correction setting device, 11...data output section, 12.・
-...High voltage setting device, 13...Counting, power supply abnormality setting device, 14...Data processing circuit, 11...
Measuring section, 16...- Abnormal level detection indicator, 17
・・・・・・Voltage monitoring line agent Patent attorney Akira Namiki
Husband's agent: Kiyoshi Matsuzaki, patent attorney

Claims (1)

[Claims] 1) In a radiation monitoring system in which a radiation detection section and a measurement section are connected by a transmission line, the detection section includes a radiation detector and detection environment conditions that may affect the detection results. first data that processes and encodes the radiation dose detected by the sensor and the environmental condition data detected by the sensor and sends it to a transmission path, and also receives and processes data from the measurement unit; A processing circuit is provided, and the measurement unit decodes the encoded data transmitted from the detection unit via the transmission line, performs correction on the detected radiation dose based on environmental condition data, and outputs the result. A radiation monitoring system comprising: a second data processing circuit capable of sending required data to a detection section; and means for displaying output data from the second processing circuit. 2. The monitor system according to claim 1, wherein the environmental conditions include ambient temperature and power supply voltage. 3) In the monitor system according to claim 2, the measuring section is provided with means for specifying and encoding the power supply voltage for the radiation detector and sending it out to the transmission path, and the detecting section receives it. A monitor system characterized by having a means for decoding and setting a power supply voltage to a specified voltage.