JP2018077234A - Radio wave dosemeter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio wave dosemeter suitable for eliminating anxiety of a user.SOLUTION: A personal dosemeter 100 includes: a measurement part 10 for measuring a radiation dose; a noise detection part 12 for detecting electromagnetic noise; a calculation part 14 for calculating the radiation dose on the basis of the radiation dose measured by the measurement part 10 and a detection result of the noise detection part 12; and a display part 16 for displaying radiation dose information on the basis of the radiation dose acquired by calculation in the calculation part 14. The calculation part 14 counts up the number of integration pulses when a noise detection pulse is not input from the noise detection part 12 but a measurement pulse is input from the measurement part 10, and does not count up the number of the integration pulses when the measurement pulse and the noise detection pulse are input at the same timing from the measurement part 10 and the noise detection part 12.SELECTED DRAWING: Figure 1

Description

The present invention relates to a dosimeter for measuring a radiation dose, and more particularly to a radio dosimeter suitable for relieving a user's anxiety.

Due to the 2011 Fukushima Daiichi accident, there has been a widespread increase in radioactive contamination and the environmental air dose rate mainly in Fukushima Prefecture. Although the level of environmental pollution varies from region to region, the country recognizes that in order to investigate and explore the level of pollution and its impact on the human body, it is necessary to observe the health of residents over a long period of time.

Therefore, including the person who lived or stayed in an area or facility where there is a possibility of environmental pollution by radioactive material (hereinafter referred to as “radioactive pollution”), Those who wish to know the accumulation transition (hereinafter referred to as “subjects of radiation exposure assessment”) can carry their personal dosimeters from their necks with straps, etc., and carry them all the time to measure their own radiation exposure. Is managing.

As a conventional personal dosimeter, one that measures the radiation dose received by the personal dosimeter and displays the measured radiation dose is known. Moreover, when the measured radiation dose becomes more than a predetermined value, there is known one that notifies a warning (Patent Documents 1 and 2).

JP 2007-101467 A JP 2006-350236 A

However, in the conventional personal dosimeter and the dosimeters described in Patent Documents 1 and 2, it is assumed that the measurement value or display value of the dosimeter changes when external noise is received. There was a problem that the subject was anxious.

Therefore, the present invention has been made paying attention to such an unsolved problem of the conventional technology, and an object thereof is to provide a radio dosimeter suitable for resolving the user's anxiety. Yes.

[Invention 1] In order to achieve the above object, the dosimeter of Invention 1 includes measurement means for measuring radiation dose, and display means for displaying radiation dose information based on the radiation dose measured by the measurement means. The dosimeter is provided with noise detection means for detecting external noise, and notifies the radiation dose based on the radiation dose measured by the measurement means and the detection result of the noise detection means.

With such a configuration, the radiation dose is measured by the measurement means, and the radiation dose information is displayed by the display means based on the measured radiation dose. When the external noise is detected by the noise detection means, a notification regarding the radiation dose is made based on the radiation dose measured by the measurement means and the detection result of the noise detection means.

[Invention 2] Furthermore, the dosimeter of Invention 2 is the dosimeter of Invention 1, further comprising a calculation means for calculating the radiation dose based on the radiation dose measured by the measurement means and the detection result of the noise detection means, The display means displays the radiation dose information based on the radiation dose obtained by the calculation by the calculation means.

If it is such a structure, a radiation means will be calculated by the calculating means based on the radiation dose measured by the measuring means and the detection result of the noise detecting means, and based on the radiation dose obtained by the calculation by the display means. Radiation dose information is displayed.

[Invention 3] Further, the dosimeter of Invention 3 is the dosimeter of Invention 2, wherein the calculation means subtracts the radiation dose converted from the detection result of the noise detection means from the radiation dose measured by the measurement means. To do.

With such a configuration, the radiation amount converted from the detection result of the noise detection unit is subtracted from the radiation amount measured by the measurement unit by the calculation unit.

[Invention 4] Further, the dosimeter of Invention 4 is the dosimeter of Invention 3, wherein the measurement means outputs detection information indicating that radiation has been detected, and the noise detection means detects external noise. When the detection means inputs the detection information from the measurement means without inputting the detection information from the noise detection means, the detection information from the measurement means is used to measure the radiation dose. When the detection information is input at the same timing from the measurement unit and the noise detection unit, the detection information is not calculated as a measurement value of the radiation dose.

With this configuration, when detection information is not input from the noise detection means but detection information is input from the measurement means, the detection information from the measurement means is calculated as a measurement value of the radiation dose by the calculation means. . Further, when detection information is input from the measurement means and the noise detection means at the same timing, the detection information is not calculated as a measurement value of the radiation dose by the calculation means.

[Invention 5] Furthermore, the dosimeter of Invention 5 outputs detection information indicating that a natural phenomenon that suddenly changes a measured value or a display value of the dosimeter in the dosimeter of Invention 4 is detected. Natural phenomenon detection means for detecting the natural phenomenon, and when the calculation means inputs the detection information at the same timing from the measurement means, the noise detection means, and the natural phenomenon detection means, Calculated as a measurement of radiation dose.

With such a configuration, when detection information is input from the measurement means, the noise detection means, and the natural phenomenon detection means at the same timing, the detection information is calculated as a radiation dose measurement value by the calculation means. .

[Invention 6] Further, in the dosimeter of Invention 6, in the dosimeter of Invention 1, the display means performs display relating to the correlation between the radiation dose measured by the measurement means and the detection result of the noise detection means.

If it is such a structure, the display regarding the correlation with the radiation amount measured with the measurement means and the detection result of a noise detection means will be performed by a display means.

[Invention 7] The dosimeter according to Invention 7 is the dosimeter according to any one of Inventions 1 to 6, further comprising a plurality of measurement means or a plurality of noise detection means.

[Invention 8] Further, in the dosimeter of Invention 8, in the dosimeter of any one of Inventions 1 to 7, the external noise is caused by a natural phenomenon that suddenly changes a measured value or a display value of the dosimeter. It is an external noise.

With such a configuration, when external noise caused by a natural phenomenon that suddenly changes the measured value or display value of the dosimeter is detected by the noise detecting means, the radiation dose and noise detected by the measuring means are detected. A notification regarding the radiation dose is made based on the detection result of the means.

[Invention 9] Further, the dosimeter of Invention 9 is the dosimeter of Invention 8, wherein the natural phenomenon is a solar activity phenomenon.

With such a configuration, when the external noise caused by the solar activity phenomenon is detected by the noise detection means, a notification regarding the radiation dose is made based on the radiation dose measured by the measurement means and the detection result of the noise detection means. Done.

[Invention 10] Further, the dosimeter of Invention 10 is the dosimeter of Invention 9, wherein the solar activity phenomenon is high energy particles, protons, electrons, gamma rays, X-rays, radio waves or the like caused by solar flare phenomenon and sunspot activity. It is a phenomenon that an electromagnetic wave arrives, or an aurora.

[Invention 11] The dosimeter of Invention 11 is the dosimeter of any one of Inventions 8 to 10, wherein the natural phenomenon is lightning, thundercloud, in-cloud discharge or inter-cloud discharge.

With such a configuration, when external noise caused by lightning, thunderclouds, in-cloud discharge or inter-cloud discharge is detected by the noise detection means, it is based on the radiation dose measured by the measurement means and the detection result of the noise detection means. Notification of radiation dose is made.

[Invention 12] The dosimeter of Invention 12 is a dosimeter comprising first measurement means for measuring radiation dose and display means for displaying radiation dose information based on the radiation dose measured by the measurement means. And a second measurement means for measuring the radiation dose, and performing notification regarding the radiation dose based on the measurement result of the first measurement means and the measurement result of the second measurement means.

With such a configuration, the radiation dose is measured by the first measurement means, and the radiation dose information is displayed by the display means based on the measured radiation dose. Then, when the radiation dose is measured by the second measurement means, a notification regarding the radiation dose is made based on the measurement result of the first measurement means and the measurement means of the second measurement means.

As described above, according to the dosimeter of the invention 1, the user can be notified of the radiation dose in consideration of the detection result of the external noise that affects the measurement value or display value of the dosimeter. The effect that the user's anxiety when viewing radiation dose information affected by external noise can be reduced is obtained.

Furthermore, according to the dosimeter of the invention 2, the user can grasp relatively accurate radiation dose information based on the radiation dose measured by the measurement means and the detection result of the noise detection means, so that the influence of external noise Even if it receives, the effect that a user's anxiety can be reduced is acquired.

Furthermore, according to the dosimeter of the invention 3, since the radiation dose converted from the detection result of the noise detection means is subtracted from the radiation dose measured by the measurement means, the user grasps more accurate radiation dose information. The effect that it can do is acquired.

Furthermore, according to the dosimeter of the invention 5, it is possible to grasp relatively accurate radiation dose information even under the influence of external noise caused by a natural phenomenon that suddenly changes the measured value or display value of the dosimeter. The effect of being able to be obtained.

Furthermore, according to the dosimeter of the invention 6, since the user can grasp the correlation between the radiation dose measured by the measuring means and the detection result of the noise detecting means from the display on the display means, the influence of external noise Even if it receives, the effect that a user's anxiety can be reduced is acquired.

Furthermore, according to the dosimeter of the invention 7, since a plurality of measuring means or a plurality of noise detecting means are provided, there is an effect that the reliability can be improved.

Furthermore, according to the dosimeter of the invention 8, the user's anxiety can be reduced even under the influence of external noise caused by a natural phenomenon that suddenly changes the measured value or display value of the dosimeter. Is obtained.

Furthermore, according to the dosimeter of the ninth aspect of the present invention, it is possible to reduce the user's anxiety even under the influence of external noise caused by the solar activity phenomenon.

Furthermore, according to the dosimeter of the eleventh aspect, it is possible to reduce the user's anxiety even under the influence of external noise caused by lightning, thunderclouds, in-cloud discharge or inter-cloud discharge.

Furthermore, according to the dosimeter of the twelfth aspect of the invention, the user can be notified of the radiation dose in consideration of the measurement result of the first measurement means and the measurement means of the second measurement means. The effect that quantity information can be grasped is obtained.

2 is a block diagram showing a configuration of a personal dosimeter 100. FIG. 4 is a flowchart showing a pulse calculation process executed by a calculation unit 14. It is a flowchart which shows the radiation dose calculation process performed by the calculating part. 6 is a graph showing temporal changes in measurement pulses, noise detection pulses, and measurement pulse waveforms on the display unit 16; 3 is a display screen of the display unit 16. 2 is a block diagram showing a configuration of a personal dosimeter 110. FIG. 4 is a flowchart showing a pulse calculation process executed by a calculation unit 14. 5 is a graph showing temporal changes in a measurement pulse, a noise detection pulse, a lightning detection pulse, and a measurement pulse waveform of the display unit 16; It is a figure which shows other embodiment of this invention. 10 is a flowchart illustrating an operation according to the configuration of FIG. 9.

First Embodiment Hereinafter, a first embodiment of the present invention will be described. First, an outline of the present embodiment will be described.

The person to be evaluated for radiation exposure doses the personal dosimeter according to the present embodiment from the neck with a strap or the like and always carries it. Here, the radiation dose assessment target person refers to a person who lives or stays in an area or facility where there is a possibility of radioactive contamination in a narrow sense, but the radiation dose assessment target person possesses an identification card, etc. In order to prevent discrimination, etc., and to function as a control group, residents in areas where there is no possibility of radioactive contamination may be included in the subjects. The personal dosimeter measures the radiation dose received by the personal dosimeter, and the radiation dose measured by the personal dosimeter is based on the radiation dose assessment because the person to be evaluated for radiation dose is closely carrying. It can be considered that it is equivalent to the radiation dose to which the subject has been exposed. The personal dosimeter may be of any system and structure as long as it can measure the radiation dose. For example, a known personal dosimeter can be adopted.

When the external noise is received, the measured value or the display value of the personal dosimeter may change due to a sudden increase in the surrounding radiation dose or the influence of the circuit of the personal dosimeter. One example of external noise is electromagnetic noise. Electromagnetic noise occurs in medical equipment, electrical appliances, accelerators, and plant plants, so if you bring a personal dosimeter near it, the measured or displayed value of the personal dosimeter changes due to the influence of electromagnetic noise. There are things to do.

In addition, electromagnetic noise also occurs when a natural phenomenon (hereinafter referred to as “specific natural phenomenon”) that suddenly changes the measured value or display value of the personal dosimeter occurs. Alternatively, the display value may change. Among the specific natural phenomena, the natural phenomenon that suddenly changes the measured value of the personal dosimeter is a natural phenomenon in which the surrounding radiation dose suddenly increases or decreases. On the other hand, a natural phenomenon that suddenly changes the displayed value of a personal dosimeter among specific natural phenomena does not change the surrounding radiation dose so much, but for example, the circuit of the personal dosimeter is affected by an electron beam or the like. This is a natural phenomenon in which the displayed value of a personal dosimeter changes due to malfunction. Examples of specific natural phenomena include solar activity phenomena (solar flare phenomenon, sunspot number change, corona gas ejection phenomenon, solar radio wave burst phenomenon, Dellinger phenomenon), lightning, and aurora.

According to a press release dated February 16, 2011 by the National Institute of Information and Communications Technology (hereinafter referred to as “NICT”), the solar activity phenomenon is predicted as follows.

“NICT confirmed a large-scale solar flare phenomenon on Tuesday, February 15, 2011 at 10:44 (Japan time). The X-ray intensity associated with this solar flare is more than 100 times the normal ( This is the first solar flare occurrence since December 2006.

In general, when a large-scale solar flare occurs, various environmental changes accompanying it occur in outer space near the earth. These changes in the space environment include changes that are confirmed immediately after the occurrence of a flare (a few minutes), and changes that are confirmed after coming to the earth over several days. As for the former, we confirmed the solar radio wave burst phenomenon caused by solar flare, ionosphere and geomagnetic fluctuations by NICT observation. The latter is expected to arrive on Earth around February 17 (Thursday) to 18 (Friday).

1) Phenomenon confirmed to date and solar radio wave burst phenomenon due to solar flare Large solar flare phenomenon was confirmed by NICT's solar monitoring telescope. In addition, the radio wave telescope of NICT observed the corona mass emission phenomenon associated with solar flare and the radio wave that was thought to be generated from the shock wave in front of it.

・ Ionospheric phenomenon (Derringer phenomenon) due to solar flare 2) Phenomenon that is expected to occur in the future due to this solar flare ・ Magnetic storm phenomenon The space environment around the earth fluctuates on a large scale, resulting in geomagnetic disturbances and the Earth The arrival of high-energy particles in the surrounding area may cause damage to satellites such as communication satellites and broadcast satellites. In addition, aurora activity may become active.

・ Ionospheric storm phenomenon The state of the ionosphere fluctuates, which may cause problems with short-wave communication and other wireless communications, as well as phenomena that temporarily degrade the accuracy of high-precision positioning using GPS (Global Positioning System). There is.

NICT has been providing information on solar activity and changes in the space environment for many years. The 24th solar activity cycle, which started around January 2008, was quieter than the previous solar cycle, but we believe that future solar activity will be activated by this phenomenon. We think that the space environment like this phenomenon will be more likely to occur with the activation. Therefore, an object of the present embodiment is to reduce the influence of electromagnetic noise including a specific natural phenomenon.

Next, the configuration of the personal dosimeter will be described. FIG. 1 is a block diagram showing the configuration of the personal dosimeter 100.

As shown in FIG. 1, the personal dosimeter 100 includes a measurement unit 10 that measures radiation dose, a noise detection unit 12 that detects electromagnetic noise, and a radiation dose measured by the measurement unit 10 and a detection result of the noise detection unit 12. And a display unit 16 for displaying radiation dose information based on the radiation dose obtained by the computation in the computation unit.

The measurement unit 10 can be configured as a survey meter including, for example, a pin photodiode, and when receiving radiation, outputs a pulse indicating that the radiation has been detected (hereinafter referred to as “measurement pulse”).

The noise detection unit 12 can be configured as an AM radio, for example, and outputs a pulse (hereinafter referred to as “noise detection pulse”) indicating that the electromagnetic noise has been detected when receiving the electromagnetic noise.

The calculation unit 14 can be configured as a microprocessing unit. When the measurement pulse is input from the measurement unit 10 without inputting the noise detection pulse from the noise detection unit 12, the number of integrated pulses is counted up. When the measurement pulse and the noise detection pulse are input from 10 and the noise detection unit 12 at the same timing, the number of integrated pulses is not counted up.

The calculation unit 14 has setting information that can be set by operating means (not shown) for operation by the radiation dose evaluation target person, and can switch the measurement pulse processing method according to the setting information. The setting information includes information for determining whether to refer to a noise detection pulse, whether to display a warning on the display unit 16, and whether to count as a valid pulse when electromagnetic noise is detected.

The display unit 16 can be configured as an LCD (Liquid Crystal Display), for example.

Next, the process of the calculating part 14 is demonstrated. FIG. 2 is a flowchart showing a pulse calculation process executed by the calculation unit 14.

When the power is turned on, the calculation unit 14 initializes the value of the first integration counter for storing the number of integrated pulses and the value of the second integration counter for storing the integration time. For example, the pulse calculation process shown in the flowchart of FIG. 2 is executed every 200 [ms]).

In the calculation unit 14, when the pulse calculation process is executed, the process first proceeds to step S100 as shown in FIG.

In step S100, it is determined whether or not a measurement pulse is input from the measurement unit 10, and when it is determined that a measurement pulse is input (YES), the process proceeds to step S102, and based on the setting information of the calculation unit 14 It is determined whether or not to refer to the noise detection pulse. When it is determined to refer to the noise detection pulse (YES), the process proceeds to step S104.

In step S104, it is determined whether or not a noise detection pulse has been input from the noise detection unit 12, and when it is determined that a noise detection pulse has been input (YES), the process proceeds to step S106 and setting information of the calculation unit 14 is set. Whether or not to display a warning on the display unit 16 is determined based on the above, and when it is determined to display the warning (YES), the process proceeds to step S108.

In step S108, a warning is displayed on the display unit 16, and the process proceeds to step S110, where it is determined whether to count as a valid pulse based on the setting information of the calculation unit 14, and it is determined to count as a valid pulse. If (YES), the process proceeds to step S112.

In step S112, the number of accumulated pulses is incremented by “1” by counting up the value of the first accumulation counter, the process proceeds to step S114, the measurement pulse waveform is displayed on the display unit 16, and the process proceeds to step S116. Then, the number of integrated pulses is displayed on the display unit 16 based on the value of the first integration counter, the process proceeds to step S118, the integration time is displayed on the display unit 16 based on the value of the second integration counter, and a series of The process ends. Note that the value of the second integration counter is counted up every predetermined period (for example, 1 [s]).

On the other hand, when it is determined in step S110 that it is not counted as a valid pulse (NO) and when it is determined in step S100 that a measurement pulse is not input (NO), the series of processing ends.

On the other hand, when it is determined in step S106 that no warning is displayed (NO), the process proceeds to step S110.

On the other hand, when it is determined in step S104 that a noise detection pulse is not input (NO), and when it is determined in step S102 that a noise detection pulse is not referred to (NO), the process proceeds to step S112.

FIG. 3 is a flowchart showing the radiation dose calculation process executed by the calculation unit 14. The calculation unit 14 executes the radiation dose calculation process shown in the flowchart of FIG. 3 at predetermined intervals (for example, 1 [s]) in parallel with the pulse calculation process shown in the flowchart of FIG.

In the calculation unit 14, when the radiation dose calculation process is executed, the process proceeds to step S200 as shown in FIG.

In step S200, the number of accumulated pulses per unit time (for example, from the present to one minute before) [cpm] is acquired, the process proceeds to step S202, and the acquired accumulated number of pulses per unit time is multiplied by a predetermined coefficient. Then, the radiation dose per unit time [mSv / h] is calculated, the process proceeds to step S204, the calculated radiation dose per unit time is displayed on the display unit 16, and the series of processing ends.

Next, the operation of the present embodiment will be described. FIG. 4 is a graph showing temporal changes in the measurement pulse, the noise detection pulse, and the measurement pulse waveform of the display unit 16.

FIG. 5 is a display screen of the display unit 16. In personal dosimeter 100, when receiving radiation, measurement unit 10 outputs a measurement pulse. In the calculation unit 14, when the measurement pulse is input without inputting the noise detection pulse, the number of integrated pulses is counted up and the measurement pulse waveform is displayed on the display unit 16 as shown in FIG. In FIG. 4, the measurement pulse waveform is displayed when only the measurement pulse is detected. In addition to the measurement pulse waveform, the display unit 16 displays the number of accumulated pulses, the accumulated time, and the like as shown in FIG.

On the other hand, in the personal dosimeter 100, when it receives electromagnetic noise, a noise detection pulse is output by the noise detector 12. At this time, it is assumed that measurement pulses are simultaneously output by the measurement unit 10 under the influence of electromagnetic noise. In the calculation unit 14, when the measurement pulse and the noise detection pulse are input from the measurement unit 10 and the noise detection unit 12 at the same timing, as shown in FIG. 4, the measurement pulse waveform is not counted up. It is not displayed on the display unit 16. However, as shown in FIG. 5, a warning (for example, a frog mark) is displayed on the display unit 16 so that it can be seen that the display unit 16 has been affected by electromagnetic noise.

Thus, in this embodiment, the personal dosimeter 100 includes the measurement unit 10 that measures the radiation dose, the noise detection unit 12 that detects electromagnetic noise, and the radiation dose and noise detection unit that are measured by the measurement unit 10. 12 includes a calculation unit 14 that calculates the radiation dose based on the detection results of 12, and a display unit 16 that displays the radiation dose information based on the radiation dose obtained by the calculation in the calculation unit 14, When a noise detection pulse is not input from the noise detection unit 12 and a measurement pulse is input from the measurement unit 10, the number of integrated pulses is counted up, but the measurement pulse and noise are counted at the same timing from the measurement unit 10 and the noise detection unit 12. When the detection pulse is input, the total number of pulses is not counted up.

As a result, the radiation dose evaluation target person can grasp relatively accurate radiation dose information based on the radiation dose measured by the measurement unit 10 and the detection result of the noise detection unit 12. However, it is possible to reduce the anxiety of the radiation dose evaluation target person.

Further, in the present embodiment, the calculation unit 14 displays a warning on the display unit 16 when the measurement pulse and the noise detection pulse are input from the measurement unit 10 and the noise detection unit 12 at the same timing.

Accordingly, the radiation dose evaluation target person can grasp the correlation between the radiation dose measured by the measurement unit 10 and the detection result of the noise detection unit 12 from the warning displayed on the display unit 16. It is possible to reduce the anxiety of the radiation dose evaluation subject even under the influence of.

In the present embodiment, the measurement unit 10 corresponds to the measurement unit of the invention 1 to 4 or 6, the noise detection unit 12 corresponds to the noise detection unit of the invention 1 to 4 or 6, and the calculation unit 14 is the invention. The display unit 16 corresponds to the display means of the first, second, or sixth aspects, corresponding to the calculation means of 2 to 4. The pulse corresponds to the detection information of aspect 4.

[Second Embodiment] Next, a second embodiment of the present invention will be described. Hereinafter, only the parts different from the first embodiment will be described, and the same parts as those in the first embodiment will be denoted by the same reference numerals and the description thereof will be omitted.

In the first embodiment, the influence of electromagnetic noise caused by a specific natural phenomenon is also reduced. However, in this embodiment, the surrounding radiation dose suddenly increases or decreases. In the case of a specific natural phenomenon, it may be possible to measure accurately including the radiation dose due to the specific natural phenomenon, so the ambient radiation dose suddenly increases while reducing the effects of electromagnetic noise from medical devices, etc. The objective is to take into account the effects of certain natural phenomena that may be reduced or reduced. An example of such a specific natural phenomenon is lightning.

First, the configuration of the personal dosimeter will be described. FIG. 6 is a block diagram showing the configuration of the personal dosimeter 110.

As shown in FIG. 6, the personal dosimeter 110 includes a lightning detection unit 18 that detects lightning in addition to the measurement unit 10, the noise detection unit 12, the calculation unit 14, and the display unit 16.

The lightning detection unit 18 can be configured as, for example, a lightning information reception unit that receives lightning information from a lightning discharge position locating system disclosed in Japanese Patent Application Laid-Open No. 2007-121127. When lightning information is received, it indicates that a lightning has been detected. A pulse (hereinafter referred to as “lightning detection pulse”) is output.

When the calculation unit 14 does not input the lightning detection pulse from the lightning detection unit 18 and inputs the measurement pulse and the noise detection pulse from the measurement unit 10 and the noise detection unit 12 at the same timing, the calculation unit 14 does not count up the number of integrated pulses. When the measurement pulse is input from the measurement unit 10 without inputting the noise detection pulse from the noise detection unit 12, and from the measurement unit 10, the noise detection unit 12 and the lightning detection unit 18, the measurement pulse and the noise detection pulse are transmitted at the same timing. When a lightning detection pulse is input, the accumulated pulse number is counted up.

Next, the process of the calculating part 14 is demonstrated. FIG. 7 is a flowchart showing a pulse calculation process executed by the calculation unit 14.

The calculation unit 14 executes the pulse calculation process shown in the flowchart of FIG. 7 at predetermined intervals (for example, 200 [ms]) instead of the pulse calculation process shown in the flowchart of FIG. The pulse calculation process of FIG. 7 differs from the pulse calculation process of FIG. 2 in that the process of step S105 is added between step S104 and step S106.

In step S104, it is determined whether or not a noise detection pulse has been input from the noise detection unit 12. If it is determined that a noise detection pulse has been input (YES), the process proceeds to step S105, and the lightning detection unit 18 receives a lightning pulse. It is determined whether a detection pulse has been input. When it is determined that a lightning detection pulse has been input (YES), the process proceeds to step S112.

On the other hand, when it is determined in step S105 that no lightning detection pulse is input (NO), the process proceeds to step S106.

Next, the operation of the present embodiment will be described. FIG. 8 is a graph showing temporal changes in the measurement pulse, noise detection pulse, lightning detection pulse, and measurement pulse waveform of the display unit 16.

In personal dosimeter 110, when receiving radiation, measurement unit 10 outputs a measurement pulse. In the calculation unit 14, when the measurement pulse is input without inputting the noise detection pulse, the number of integrated pulses is counted up, and the measurement pulse waveform is displayed on the display unit 16 as shown in FIG. 8.

On the other hand, when the personal dosimeter 110 receives electromagnetic noise from a medical device or the like, a noise detection pulse is output by the noise detection unit 12. At this time, it is assumed that measurement pulses are simultaneously output by the measurement unit 10 under the influence of electromagnetic noise. In the calculation unit 14, when the measurement pulse and the noise detection pulse are input from the measurement unit 10 and the noise detection unit 12 at the same timing, the measurement pulse waveform is not counted up as shown in FIG. It is not displayed on the display unit 16.

On the other hand, when the personal dosimeter 110 receives electromagnetic noise due to lightning, the noise detection unit 12 outputs a noise detection pulse and the lightning detection unit 18 outputs a lightning detection pulse. At this time, measurement pulses are simultaneously output by the measurement unit 10. In the calculation unit 14, when the measurement pulse, the noise detection pulse, and the lightning detection pulse are input from the measurement unit 10, the noise detection unit 12, and the lightning detection unit 18 at the same timing, the number of integrated pulses is counted up, and FIG. As shown, the measurement pulse waveform is displayed on the display unit 16.

In this way, in the present embodiment, the calculation unit 14 does not input the lightning detection pulse from the lightning detection unit 18 and inputs the measurement pulse and the noise detection pulse from the measurement unit 10 and the noise detection unit 12 at the same timing. When the number of accumulated pulses is not counted up, but the noise detection pulse is not input from the noise detection unit 12 and the measurement pulse is input from the measurement unit 10, and the measurement unit 10, the noise detection unit 12, and the lightning detection unit 18 When the measurement pulse, noise detection pulse, and lightning detection pulse are input at the same timing, the number of accumulated pulses is counted up.

Thereby, even if it receives the influence of the electromagnetic noise resulting from a lightning, comparatively accurate radiation dose information can be grasped | ascertained.

In the present embodiment, the measurement unit 10 corresponds to the measurement means of the inventions 1 to 6, the noise detection unit 12 corresponds to the noise detection means of the inventions 1 to 6, and the calculation unit 14 corresponds to the inventions 2 to 5. Corresponding to the calculation means, the display unit 16 corresponds to the display means of the invention 1, 2 or 6. The lightning detection unit 18 corresponds to the natural phenomenon detection means of the invention 5, and the pulse corresponds to the detection information of the invention 4 or 5.

Other Embodiments In the first and second embodiments, when the noise detection pulse is not input from the noise detection unit 12 and the measurement pulse is input from the measurement unit 10, the number of integrated pulses is calculated. Count up, but when the measurement pulse and noise detection pulse are input from the measurement unit 10 and the noise detection unit 12 at the same timing, it is configured not to count up the number of integrated pulses. Such a configuration can also be adopted.

FIG. 9 is a diagram showing another embodiment of the present invention. In FIG. 9, two measuring units 10 are provided, and the sensor system of the first measuring unit 10 is an A system, and the sensor system of the second measuring unit 10 is a B system. According to FIG. 6A, when a pulse is input from the A system without inputting a pulse from the B system, it is determined that radiation has been detected, and the cumulative number of pulses is counted up. According to FIG. 5B, when no pulse is input from the A system and a pulse is input from the B system, it is determined that radiation has been detected, and the number of integrated pulses is counted up. According to FIG. 5C, when pulses are input from the A system and the B system at the same timing, it is determined that mechanical shock, external noise, etc. are detected, and the accumulated pulse number is not counted up.

FIG. 10 is a flowchart showing the operation of the configuration of FIG. In the calculation unit 14, as shown in FIG. 10, first, the process proceeds to step S300.

In step S300, it is determined whether or not a pulse is input from the A system. When it is determined that a pulse is input from the A system (YES), the process proceeds to step S302, and whether or not a pulse is input from the B system. When it is determined that no pulse is input from the B system (NO), the process proceeds to step S304.

In step S304, it is determined that radiation has been detected, the number of integrated pulses is counted up, and a series of processes is terminated.

On the other hand, when it is determined in step S302 that a pulse has been input from the B system (YES), the process proceeds to step S306, where it is determined that a mechanical shock, external noise, or the like has been detected, and the cumulative number of pulses is counted up. First, a series of processing ends.

On the other hand, when it is determined in step S300 that no pulse is input from the A system (NO), the process proceeds to step S308, where it is determined whether a pulse is input from the B system, and a pulse is input from the B system. (YES), the process proceeds to step S304.

On the other hand, when it is determined in step S308 that no pulse is input from the B system (NO), the process proceeds to step S306.

The configuration is not limited to using two measuring units 10, and can be configured using three or more measuring units 10.

In the first and second embodiments and modifications thereof, when the measurement pulse and the noise detection pulse are input from the measurement unit 10 and the noise detection unit 12 at the same timing, the number of integrated pulses is counted up. However, the present invention is not limited to this, and when the measurement pulse and the noise detection pulse are input from the measurement unit 10 and the noise detection unit 12 at the same timing, the integrated pulse number may be counted up. it can.

Moreover, in the said 1st and 2nd embodiment and its modification, although the case where a pulse is input simultaneously is assumed with the same timing, not only this but the output signal from the measurement part 10 is assumed. When the output signal from the noise detection unit 12 overlaps on the time axis, the overlapping part or a series of output signals (from rising to falling) including the overlapping part is referred to. Can be determined based on the waveform shape of the output signal or the waveform shape of the output signal from the noise detector 12.

Moreover, in the said 1st and 2nd embodiment and its modification, although electromagnetic noise was made into object as external noise, not only this but vibration can be made into object as external noise. When a personal dosimeter is held near the vibration source or when the personal dosimeter is vibrated, the measurement value or display value of the personal dosimeter may change due to the influence of the vibration. In this case, the noise detection unit 12 can be configured as, for example, a vibration sensor, and outputs a pulse (hereinafter referred to as “vibration detection pulse”) indicating that vibration has been detected.

The modification of the first embodiment has the following configuration, for example. The calculation unit 14 counts up the number of integrated pulses when the vibration detection pulse is not input from the noise detection unit 12 and the measurement pulse is input from the measurement unit 10, but the same timing is obtained from the measurement unit 10 and the noise detection unit 12. When the measurement pulse and vibration detection pulse are input at, the number of accumulated pulses is not counted up.

A modification of the second embodiment has the following configuration, for example. When the calculation unit 14 does not input the lightning detection pulse from the lightning detection unit 18 and inputs the measurement pulse and the vibration detection pulse at the same timing from the measurement unit 10 and the noise detection unit 12, the calculation unit 14 does not count up the number of integrated pulses. When the measurement pulse is input from the measurement unit 10 without inputting the vibration detection pulse from the noise detection unit 12, and from the measurement unit 10, the noise detection unit 12, and the lightning detection unit 18, the measurement pulse and the vibration detection pulse are transmitted at the same timing. When a lightning detection pulse is input, the accumulated pulse number is counted up.

The personal dosimeters in these modified examples are assumed to be incorporated in, for example, a mobile phone or a mobile terminal having a vibration function.

In the first and second embodiments and modifications thereof, the noise detection unit 12 is configured to detect electromagnetic noise. However, the waveform shape of the output signal from the noise detection unit 12 is subjected to pattern matching. For example, it is also possible to distinguish between electromagnetic noise caused by lightning or unnecessary radiation noise from medical equipment or the like. When discriminating in this way, the measurement pulse is counted as an effective pulse when it is determined as electromagnetic noise due to lightning, but the measurement pulse is not counted as an effective pulse when it is determined as unnecessary radiation noise.

Moreover, in the said 1st and 2nd embodiment and its modification, although only the noise detection part 12 was provided and comprised, it is not restricted to this, A structure provided with two or more noise detection parts 12 is provided. You can also The same applies to the measurement unit 10.

Thereby, reliability can be improved. In the first and second embodiments and the modifications thereof, the calculation unit 14 is provided with setting information. However, the present invention is not limited to this, and settings to be performed based on the setting information are performed using a dip switch or the like. It can also be configured as follows.

In the second embodiment and its modification, lightning is targeted as a specific natural phenomenon in which the surrounding radiation dose suddenly increases or decreases. It is also possible to target specific natural phenomena such as in-cloud discharge or inter-cloud discharge.

In the second embodiment and the modification thereof, the occurrence of the specific natural phenomenon is observed. However, the present invention is not limited to this, and the occurrence of the specific natural phenomenon can be predicted. .

In the first and second embodiments and the modifications thereof, the measurement pulse is calculated based on the noise detection pulse. However, the present invention is not limited to this, and it may be configured to display only a warning. it can. On the contrary, it is also possible to adopt a configuration in which only the measurement pulse is calculated without displaying the warning.

In the first and second embodiments and modifications thereof, no warning or the like is given even if the measured radiation dose increases. However, the present invention is not limited to this, and per unit time measured by the measurement unit 10. A warning may be notified when the radiation dose exceeds a predetermined value. In addition, when the integrated value of the radiation dose per unit time measured by the measurement unit 10 is equal to or greater than a predetermined value, a warning can be notified. The integrated value is a value obtained by integrating the radiation doses measured in a predetermined period. For example, a value obtained by integrating the radiation doses measured from a predetermined measurement start time to the present time can be adopted.

In the first and second embodiments and modifications thereof, a warning (for example, a frog mark) regarding the correlation between the radiation dose measured by the measurement unit 10 and the detection result of the noise detection unit 12 is displayed on the LCD. However, the present invention is not limited to this, but the LED is turned on and blinking, a warning sound is output from the speaker, the vibrator is vibrated, the heating element is heated, and other radiation dose evaluation targets The warning can be configured to be notified by any method that can be perceived by a person. The same applies to other warnings.

Moreover, in the said 1st and 2nd embodiment and its modification, although the solar flare phenomenon etc. were illustrated as a solar activity phenomenon, more specifically, the high energy particle produced by a solar flare phenomenon and a sunspot activity A phenomenon in which protons, electrons, gamma rays, X-rays, radio waves or electromagnetic waves arrive is also conceivable.

Moreover, in the said 1st and 2nd embodiment and its modification, although this invention was applied to the personal dosimeters 100 and 110, it is not limited to this, but in other cases within the range which does not deviate from the main point of this invention It is also applicable to. For example, the present invention can be applied to dosimeters other than the personal dosimeters 100 and 110.

DESCRIPTION OF SYMBOLS 100,110 ... Personal dosimeter, 10 ... Measurement part, 12 ... Noise detection part, 14 ... Calculation part, 16 ... Display part, 18 ... Lightning detection part

Claims (12)

A dosimeter comprising a measurement means for measuring a radiation dose and a display means for displaying radiation dose information based on the radiation dose measured by the measurement means, comprising a noise detection means for detecting external noise, the measurement A dosimeter characterized by notifying the radiation dose based on the radiation dose measured by the means and the detection result of the noise detection means. In Claim 1, Comprising: The calculating means which calculates a radiation dose based on the radiation dose measured with the said measurement means, and the detection result of the said noise detection means, The said display means is the radiation obtained by the calculation in the said calculation means A dosimeter characterized by displaying radiation dose information based on the dose. The dosimeter according to claim 2, wherein the calculation unit subtracts a radiation dose converted from a detection result of the noise detection unit from a radiation dose measured by the measurement unit. In Claim 3, The said measurement means outputs the detection information which shows having detected the radiation, The said noise detection means outputs the detection information which has detected the external noise, The said calculation means has said noise When the detection information is input from the measurement means without inputting the detection information from the detection means, the detection information from the measurement means is calculated as a measurement value of the radiation dose, and is the same from the measurement means and the noise detection means. When the detection information is input at the timing, the dosimeter does not calculate the detection information as a measurement value of the radiation dose. The natural phenomenon detecting means according to claim 4, further comprising a natural phenomenon detecting means for detecting the natural phenomenon by outputting detection information indicating that a natural phenomenon that suddenly changes a measured value or a display value of the dosimeter is detected. When the detection information is input from the measurement unit, the noise detection unit, and the natural phenomenon detection unit at the same timing, the unit calculates the detection information as a measurement value of the radiation dose. . The dosimeter according to claim 1, wherein the display unit performs display related to a correlation between a radiation dose measured by the measurement unit and a detection result of the noise detection unit. The dosimeter according to any one of claims 1 to 6, comprising a plurality of the measurement units or a plurality of the noise detection units. The dosimeter according to any one of claims 1 to 7, wherein the external noise is external noise caused by a natural phenomenon that suddenly changes a measurement value or a display value of the dosimeter. The dosimeter according to claim 8, wherein the natural phenomenon is a solar activity phenomenon. The solar activity phenomenon according to claim 9, wherein the solar activity phenomenon is a phenomenon in which high energy particles, protons, electrons, gamma rays, X-rays, radio waves or electromagnetic waves arrive due to solar flare phenomenon and sunspot activity, or an aurora. Dosimeter. The dosimeter according to any one of claims 8 to 10, wherein the natural phenomenon is lightning, thundercloud, in-cloud discharge, or inter-cloud discharge. A dosimeter comprising a first measuring means for measuring a radiation dose and a display means for displaying radiation dose information based on the radiation dose measured by the measuring means, comprising a second measuring means for measuring the radiation dose. A dosimeter for notifying the radiation dose based on the measurement result of the first measurement means and the measurement result of the second measurement means.