JP5373711B2 - Radiation monitoring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radiation monitor device with improved noise resistance, reliability and maintainability. <P>SOLUTION: A waveform analyzer 4 eliminates a noise waveform and outputs a digital pulse corresponding to a signal waveform. A counter 5 counts the digital pulse, and a calculator 6 calculates a counting ratio based on a counted value so as to improve noise resistance. The calculator 6 constantly updates a waveform data package stored in memory 7. A display 8 displays a signal counting ratio and a high-signal-counting ratio alarm when a high-signal-counting ratio is issued. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a radiation monitoring apparatus used for radioactive material release management or radiation management in a nuclear reactor facility, a spent fuel reprocessing facility, or the like.

  Conventional radiation monitoring devices used in nuclear reactor facilities, spent fuel reprocessing facilities, etc., detect radiation and output analog pulses, and input analog pulses to measure the count rate. When the count rate exceeds a predetermined level, it is equipped with a measurement unit that issues an alarm. The measurement unit measures the waveform of the analog pulse and analyzes the pulse waveform based on the waveform data, and the maximum peak value exceeds the measurement target upper limit level. If the pulse width is less than the specified value, the pulse height is excessive. Also has a noise identification means that regards it as a noise waveform. (For example, see Patent Document 1)

JP 2003-28963 A

  Since the conventional radiation monitoring apparatus is configured as described above, it is representative of (1) dark current discharge noise due to high-voltage line insulation failure, and (2) high-voltage line breakage due to typical radiation in the radiation detector. High voltage on / off continuous noise cannot be identified, and (3) the undershoot-free waveform peculiar to instantaneous charge transfer noise cannot be identified due to the separation of the signal core insulation between the radiation sensor and the preamplifier input. there were.

  Also, since the noise entry status cannot be confirmed in real time, it is not possible to quickly determine whether the cause of high alarm transmission is due to an increase in radiation dose or due to equipment failure including noise. There was a problem that it took time to investigate for carving.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a radiation monitoring apparatus with improved noise resistance, high reliability, and good maintainability.

A radiation detection apparatus according to the present invention includes a radiation detector that detects radiation or a radioactive substance and outputs an analog pulse, inputs the analog pulse, measures a voltage in a time division manner, and updates a predetermined number of voltage data. store Te, the case where the most recent voltage data is equal to or greater than the trigger level, then after the elapse the first predetermined time and a second predetermined time before the above said first predetermined time and the trigger level added and waveform measuring means for outputting a time series ordered voltage data as an analog pulse waveform data of the time, and inputs the analog pulse waveform data, and analyzed maximum crest value, minimum peak value, pulse width, the pulse width about what pulse width is out of the predetermined range abnormality, reverse polarity crest excessively about what the minimum peak value exceeds the reference level of the opposite polarity, Undershoot of the serial analog pulse waveform is determined as the crest excessively large for those undershoot shortages for those not reached the reference level, the upper Symbol maximum crest value exceeds the predetermined upper limit level, the corresponding noise skip subsequent noise determination if there, with both regarded as noise waveform, it considers also the signal waveform does not correspond to them, and outputs a digital pulse corresponding to the signal waveform, analysis time and the noise determination rationale Waveform analysis means for outputting waveform data of all input pulses, maximum peak value and minimum peak value as a waveform data package, and counting for inputting and counting digital pulses corresponding to the signal waveform and outputting signal count values Means, the waveform data package, and the signal count value are input, and the signal count is based on the signal count value. When the signal count rate exceeds a predetermined level, a high signal count rate alarm is issued, and the noise mixture rate is determined as a ratio of the number of noise waveforms to the total number of waveforms in the waveform data package. When the signal level exceeds a predetermined level, a noise approach alarm is transmitted under an AND condition with the signal count rate high alarm, and the signal count rate, the signal count rate high alarm, the noise mixing rate, the noise approach alarm, and An arithmetic means for outputting the arithmetic time as an arithmetic processing data package, a storage means for storing the arithmetic processing data package and the waveform data package, and the signal count rate are always displayed, and the signal counting rate is calculated from the arithmetic means. When the high alarm is sent, the signal count rate high warning is displayed together with the signal count rate, and when the noise approach warning is sent from the computing means Display means for displaying the noise approach alarm together with the noise mixing rate, and the computing means includes a predetermined number of the latest processing data packages stored in the storage means and a predetermined number of the waveform data packages. It is always up-to-date.

  According to the radiation monitoring apparatus according to the present invention, the noise waveform accumulated through experience is identified, the signal waveform and the noise waveform are identified, and the noise resistance is improved by removing the noise and measuring the radiation dose. By making it possible to confirm the synchrony between the increase in radiation dose and the approach of noise, and by visualizing the noise intrusion status in real time, it is possible to determine whether the cause of the high radiation dose warning is due to the increase in radiation dose In addition, it is possible to confirm in a short time whether the failure is caused by equipment failure, and it is possible to provide a radiation monitoring apparatus with high reliability and good maintainability.

It is a figure which shows the structure of the radiation monitoring apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the example of a waveform display by the radiation monitoring apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the structure of the radiation monitoring apparatus which concerns on Embodiment 2 of this invention. It is a figure which shows the structure of the radiation monitoring apparatus which concerns on Embodiment 3 of this invention. It is a figure which shows the example of a waveform display by the radiation monitoring apparatus which concerns on Embodiment 4 of this invention. It is a figure which shows the example of a waveform display by the radiation monitoring apparatus which concerns on Embodiment 5 of this invention. It is a figure which shows the example of a waveform display by the radiation monitoring apparatus which concerns on Embodiment 6 of this invention.

  Preferred embodiments of a radiation monitoring apparatus according to the present invention will be described below with reference to the accompanying drawings. Note that the present invention is not limited to this embodiment, and includes various design changes.

Embodiment 1 FIG.
FIG. 1 is a block diagram showing a configuration of a radiation monitoring apparatus according to Embodiment 1, in which a radiation detector 1 detects radiation and outputs an analog pulse, and a pulse amplifier 2 outputs from the radiation detector 1. is the waveform measuring means amplifies the height of the analog pulse and outputs (hereinafter, referred to. ADC) 3. The ADC 3 receives the amplified analog pulse output from the pulse amplifier 2 and measures the voltage in a time division manner, and always updates a predetermined number of voltage data and stores them as a package. When the latest voltage data reaches or exceeds the trigger level, the voltage data arranged in a time series for a predetermined time together with the predetermined time before the trigger level is collected as analog pulse waveform data after the predetermined time has elapsed. Output. The trigger level of the ADC 3 is set to a lower limit level as a signal waveform, for example.

  The waveform analyzer 4 which is a waveform analysis means inputs and analyzes the waveform data output from the ADC 3, obtains the maximum peak value and the minimum peak value as shown in FIG. When the maximum peak value as shown in (b) exceeds the upper limit level of the signal waveform with respect to the signal waveform, the peak value is excessive, and the minimum peak values as shown in (c) and (d) are of opposite polarity. If the reference level is exceeded, the reverse polarity wave height is excessive, if the undershoot as shown in (e) does not reach the reference level or less, the undershoot is insufficient, and the pulse width as shown in (f) For those that deviate below the predetermined range and those whose pulse width deviates beyond the predetermined range as shown in (g), the pulse width is abnormal, the reverse polarity wave height is excessive, the undershoot Lack It is determined in the order of wave height excessive. All of them are regarded as noise waveforms, and those that do not fall under those conditions that satisfy the predetermined wave height condition (a) are regarded as signal waveforms, and digital pulses are output corresponding to the signal waveforms and analyzed. The waveform data, maximum peak value, and minimum peak value of all the input pulses are output as a waveform data package together with the time and noise determination basis. The counter 5 which is a coefficient means inputs a digital pulse corresponding to a signal waveform and measures a signal count value at a constant period.

  The computing unit 6 as a computing means inputs the waveform data package and the signal count value, obtains the signal count rate based on the signal count value, and when the signal count rate exceeds a predetermined level, the signal count rate high alarm The signal count rate, the signal count rate high alarm, the noise mixture rate described later, and the calculation time are output as the calculation processing data package.

The relationship between the signal integrated value M, the signal count value m, the standard deviation σ, the time constant τ, the constant γ, the constant λ, and the constant α is expressed by the equations (1) to (5). Note that these equations are described in Japanese Patent Laid-Open No. 11-326523, although the symbols are different, and can be referred to.
σ = 1 / (2 mτ) ^1/2 (1)
τ = 1 / (2mσ ² ) (2)
m = e ^γM = 2 ^{γM / ln2} (3)
γ = 2σ ² = 1 / (mτ) = 2− ^λ ln2 (4)
α = 11−λ (5)

Therefore, assuming that the current count value is ΔN (current), the current signal integrated value is M (current), the previous signal integrated value is M (previous), and the fixed cycle time is ΔT, the following (6 ) (7) can be calculated to obtain the current count value m (current). Α is a weighting constant for integration. For example, α = 0 when σ = 0.013, α = 2 when σ = 0.026, and α = 4 when σ = 0.052. When σ = 0.104, α = 6.
M (current) = M (previous) +2 ^α × {ΔN (current) −m (previous) × ΔT} (6)
m (current) = e ^{γM (current)} = 2e ^{γM (current) / ln2} (7)

  The memory 7 as the storage means stores the arithmetic processing data package and the waveform data package, and the indicator 8 as the display means always displays the signal count rate, and together with the signal count rate when the signal count rate high alarm is transmitted. Displays a high signal count rate alarm. For example, a noise mixture rate and a waveform sequence arranged in time series with respect to a request are displayed.

  The computing unit 6 always updates and stores the latest predetermined number of arithmetic processing data packages in the memory 7 at regular intervals, and constantly updates and stores the latest predetermined number of waveform data packages. The ratio of the number of noise waveforms to the number is obtained to obtain the noise mixing rate. The memory 7 is provided with a spare area, and the arithmetic unit 6 stores necessary data in the spare area of the memory 7 for a predetermined calculation period so that the data at the time of transmitting the signal count rate high alarm to be displayed is not overwritten. Move and store only.

  As described above, according to the radiation monitoring apparatus according to the first embodiment, the waveform analyzer 4 removes the noise waveform and outputs a digital pulse corresponding to the signal waveform, and the counter 5 counts the digital pulse. The noise resistance is improved by obtaining the count rate by the arithmetic unit 6 based on the count value. Further, the computing unit 6 constantly updates the waveform data package stored in the memory 7 and displays the signal count rate and the signal count rate high alarm on the display unit 8 when the signal count rate high alarm is transmitted. The noise mixing rate is displayed so that it can be confirmed whether the increase in the signal count rate is synchronized with the noise mixing rate. Furthermore, by displaying the waveform at the time of signal count rate high alarm transmission by request in time series, it was made possible to check the noise intrusion status, so the signal waveforms covering the empirically accumulated noise waveforms and By automatically identifying the noise waveform and visualizing it in real time, it is possible to instantly check whether the signal count rate high alarm transmission is due to an increase in the count rate or due to equipment failure including the effect of noise. .

Embodiment 2. FIG.
Next, a radiation monitoring apparatus according to Embodiment 2 will be described. FIG. 3 is a block diagram showing the configuration of the radiation monitoring apparatus according to the second embodiment. The counter 5 described in the first embodiment is replaced with a first counter 9, and a second counter is connected in parallel to the first counter 9. A counter 10 is provided. In addition, about another structure, it is the same as that of Embodiment 1, The description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  The radiation monitoring apparatus according to the second embodiment is configured as described above, and the waveform analyzer 4 outputs a digital pulse corresponding to the signal waveform when the input analog pulse is a signal waveform. When the analog pulse is a noise waveform, a digital pulse corresponding to the noise waveform is output.

  The first counter 9 counts digital pulses corresponding to the signal waveform at a fixed period and outputs a signal count value ΔN1, and the second counter 10 counts digital pulses corresponding to the noise waveform at a fixed period. The noise count value ΔN2 is output.

The computing unit 6 receives the signal count value ΔN1 and the noise count value ΔN2, obtains the signal count rate in the same manner as in the first embodiment, and obtains ΣΔN1, Σ as the movement integrated values of ΔN1 and ΔN2, respectively. ΔN2 is obtained, and ΣΔN2 / ( ΣΔN1 + ΣΔN2 ) is obtained as the noise mixing rate. Therefore, since the number of waveforms increases compared to the case where the noise mixing rate is obtained from a predetermined number of waveform data stored in the memory 8, there is an effect that it is possible to suppress a reduction in accuracy of the noise mixing rate when the amount of noise mixing is large. .

Embodiment 3 FIG.
Next, a radiation monitoring apparatus according to Embodiment 3 will be described. FIG. 4 is a block diagram showing the configuration of the radiation monitoring apparatus according to the third embodiment, in which an up / down counter 11, a frequency synthesis circuit 12, and an integration control circuit 13 are added to the radiation monitoring apparatus described in the second embodiment. It is what. In addition, about another structure, it is the same as that of Embodiment 2, and the description is abbreviate | omitted by attaching | subjecting the same code | symbol.

  The radiation monitoring apparatus according to the third embodiment is configured as described above, and the up / down counter 11 inputs a digital pulse output from the waveform analyzer 4 to the addition input unit 11a and inputs a feedback pulse described later as a subtraction. An integrated value M, which is input to the unit 11b and integrated with the difference between the two, is output to the computing unit 6. At this time, the frequency synthesizing circuit 12 receives the integrated value M and generates a feedback pulse by dividing and synthesizing the clock pulse of the computing unit 6 based on the integrated value M.

Further, when the up / down counter 11 counts based on the equation (5) described in the first embodiment, for example, when σ = 0.026, the integration control circuit 13 weights 2 ^α = 2 ² = 4. When σ = 0.052, weighting of 2 ^α = 2 ⁴ = 16 is performed. The arithmetic unit 6 receives the integrated value M, and obtains the signal count rate m by the equation (3) described in the first embodiment based on the integrated value M.

  As described above, according to the radiation monitoring apparatus according to the third embodiment, the circuit that operates so that the signal count rate m and the integrated value M are balanced in the relationship of M = (1 / γ) ln (m). Since the integrated value M is continuously measured without being affected by the computation time of the computing unit 6 by providing, it responds to a high count rate at a high speed and suppresses counting off to a high count rate. It can be measured with high accuracy.

Embodiment 4 FIG.
Next, a radiation monitoring apparatus according to Embodiment 4 will be described. FIG. 5 is a diagram showing a waveform display example on the display. In the radiation monitoring apparatus according to any one of the first to third embodiments, the display unit 8 simplifies the waveform output from the computing unit 6 with a perpendicular line connecting the maximum peak value and the minimum peak value, as shown in FIG. Display with reference level, signal level, upper limit level as signal waveform, reverse polarity determination level, undershoot determination level. Also, abnormal pulse widths are identified by the width of the vertical line, for example, those with a pulse width deviating below a predetermined range are indicated by a thin line, and those having a pulse width deviating beyond a predetermined range are indicated by a thick line. . Therefore, the visibility of the signal waveform and the noise waveform can be dramatically improved.

  The waveform analyzer 4 deletes the waveform data of all input pulses from the waveform data package composed of the analysis time, noise determination grounds, waveform data of all input pulses, maximum peak value, and minimum peak value. The amount may be reduced.

Embodiment 5 FIG.
Next, a radiation monitoring apparatus according to Embodiment 5 will be described. FIG. 6 is a diagram showing a waveform display example in the display of the radiation monitoring apparatus according to the fifth embodiment. Instead of displaying with the width of the perpendicular line connecting the maximum peak value and the minimum peak value in the fourth embodiment, the display device 8 has a pulse width deviating below a predetermined range, for example, as shown in FIG. A blue line whose pulse width deviates beyond a predetermined range is displayed as a red line, and the others are displayed as a black line. The configuration of the radiation monitoring apparatus is the same as that of the fourth embodiment, and the radiation monitoring apparatus according to any one of the first to third embodiments is used. Further, in the waveform analyzer 4, the waveform data of all input pulses are deleted from the waveform data package composed of the analysis time, noise determination grounds, waveform data of all input pulses, maximum peak value, and minimum peak value. The amount may be reduced as in the fourth embodiment.

  As described above, the radiation monitoring apparatus according to the fifth embodiment is configured to identify and display different types of noise with different colors of perpendicular lines, and thus has an effect of further improving the visibility.

Embodiment 6 FIG.
Next, a radiation monitoring apparatus according to Embodiment 6 will be described. FIG. 7 is a diagram showing a waveform display example in the display of the radiation monitoring apparatus according to the sixth embodiment. As shown in FIG. 7, the display 8 fills and displays the time when the waveform data is not extracted (the period in which there is no pulse satisfying the waveform extraction condition, that is, the period in which there is no signal and noise) with the reference level, Visualize the density of perpendiculars. That is, the random pulses are displayed by being connected by a reference level 0 V horizontal line, and the perpendicular density is visualized as indicated by an arrow A in the figure. Therefore, the visibility is greatly improved with respect to the noise approaching condition, particularly the transient noise approaching. Note that the portion indicated by the arrow A in FIG. 7 may be displayed by color, such as a red line, as described in the fifth embodiment.

1 Radiation detector 2 Pulse amplifier 3 ADC
4 Waveform Analyzer 5 Counter 6 Arithmetic Unit 7 Memory 8 Display 9 First Counter 10 Second Counter 11 Up / Down Counter 11a Addition Input Unit 11b Subtraction Input Unit 12 Frequency Synthesis Circuit 13 Integration Control Circuit

Claims (7)

A radiation detector that detects radiation or radioactive material and outputs an analog pulse;
Input the analog pulse, measure the voltage in a time-sharing manner, update and store a predetermined number of voltage data, and if the latest voltage data is equal to or higher than the trigger level, then after the elapse of the first predetermined time, and waveform measuring means for outputting said first predetermined time and sequential manner ordered voltage data when the second time plus the predetermined time before the above the trigger level as analog pulse waveform data,
Input the analog pulse waveform data, analyze the maximum peak value, minimum peak value, and pulse width. If the pulse width deviates from the predetermined range, the pulse width is abnormal, and the minimum peak value is reverse polarity. reverse polarity crest excessively about what exceeds the reference level, undershoot of the analog pulse waveform for those not reached the reference level undershoot shortage, the upper Symbol maximum crest value exceeds a predetermined upper limit level and determining a pulse height excessively about what is to skip the noise determination later if there is a corresponding noise, both with regarded as noise waveform, considers also the signal waveform does not correspond to them, corresponding to the signal waveform Digital pulse output, along with analysis time and noise judgment basis, waveform data, maximum peak value, minimum peak value of all input pulses Waveform analyzing means for outputting in the form data package,
Counting means for inputting and counting digital pulses corresponding to the signal waveform and outputting a signal count value;
The waveform data package and the signal count value are input, a signal count rate is obtained based on the signal count value, and when the signal count rate exceeds a predetermined level, a high signal count rate alarm is transmitted, Obtain the noise mixing rate as the ratio of the number of noise waveforms to the total number of waveforms in the waveform data package, and when the noise mixing rate exceeds a predetermined level, issue a noise entry alarm under the AND condition with the above signal count rate high alarm Calculating means for outputting the signal count rate, the signal count rate high alarm, the noise mixing rate, the noise approach alarm, and the calculation time as an arithmetic processing data package;
Storage means for storing the arithmetic processing data package and the waveform data package;
Always displayed the signal count rate, when the signal count rate high warning from the calculating means is transmitted displays the signal count rate high warning together with the signal count rate, the noise enters the alarm from the arithmetic means Display means for displaying the noise approach alarm together with the noise mixing rate when transmitted ,
The radiation monitoring apparatus according to claim 1, wherein the calculation means constantly updates the latest predetermined number of calculation processing data packages and the latest predetermined number of waveform data packages stored in the storage means. A radiation detector that detects radiation or radioactive material and outputs an analog pulse;
Input the analog pulse, measure the voltage in a time-sharing manner, update and store a predetermined number of voltage data, and if the latest voltage data is equal to or higher than the trigger level, then after the elapse of the first predetermined time, Waveform measuring means for outputting, as analog pulse waveform data, voltage data arranged in a time series of a time obtained by adding the first predetermined time and the second predetermined time before the trigger level or higher;
Input the analog pulse waveform data, analyze the maximum peak value, minimum peak value, and pulse width. If the pulse width deviates from the predetermined range, the pulse width is abnormal, and the minimum peak value is reverse polarity. Reverse polarity wave height is excessive for those exceeding the reference level, undershoot is insufficient for the analog pulse waveform undershoot not reaching the reference level, and the maximum peak value exceeds the predetermined upper limit level Judgment is made as an excessive wave height, and if there is a corresponding noise, the subsequent noise determination is skipped, all are regarded as noise waveforms, and those not corresponding to them are regarded as signal waveforms, and each of the above signal waveforms and the above noise waveforms Digital pulse is output corresponding to, waveform data of all input pulses along with analysis time and noise judgment grounds Waveform analyzing means for outputting a maximum peak value, minimum peak value as the waveform data package,
First counting means for inputting and counting digital pulses output corresponding to the signal waveform and outputting a signal count value;
A second counting means for inputting and counting a digital pulse output corresponding to the noise waveform and outputting a noise count value;
The waveform data package, the signal count value, and the noise count value are input, a signal count rate is obtained based on the signal count value, and when the signal count rate exceeds a predetermined level, the signal count rate high alarm The noise count rate is calculated as a ratio of the number of noise waveforms to the total number of waveforms based on the signal count value and the noise count value, and the signal count rate high alarm is detected when the noise mix rate exceeds a predetermined level. And a calculation means for outputting a noise entry alarm under an AND condition, and outputting the signal count rate, the signal count rate high alarm, the noise mixing rate, the noise entry alarm, and the calculation time as a calculation processing data package,
Storage means for storing the arithmetic processing data package and the waveform data package;
The signal count rate is always displayed, and when the signal count rate high alarm is transmitted from the arithmetic means, the signal count rate high alarm is displayed together with the signal count rate, and the noise approach alarm is transmitted from the arithmetic means. Display means for displaying the noise approach alarm together with the noise mixing rate,
The computing means always updates the latest predetermined number of processing data packages and the latest predetermined number of waveform data packages stored in the storage means, and has a predetermined number of calculation cycles for the noise count value and the signal count value. The signal movement integrated value obtained by integrating the signal count value and the noise movement integrated value obtained by integrating the noise count value are obtained, and the noise movement integrated value / (signal movement integrated value) is obtained from the signal movement integrated value and the noise movement integrated value. Value + noise movement integrated value) and obtaining the noise mixing rate. A radiation detector that detects radiation or radioactive material and outputs an analog pulse;
Input the analog pulse, measure the voltage in a time-sharing manner, update and store a predetermined number of voltage data, and if the latest voltage data is equal to or higher than the trigger level, then after the elapse of the first predetermined time, Waveform measuring means for outputting, as analog pulse waveform data, voltage data arranged in a time series of a time obtained by adding the first predetermined time and the second predetermined time before the trigger level or higher;
Input the analog pulse waveform data, analyze the maximum peak value, minimum peak value, and pulse width. If the pulse width deviates from the predetermined range, the pulse width is abnormal, and the minimum peak value is reverse polarity. Reverse polarity wave height is excessive for those exceeding the reference level, undershoot is insufficient for the analog pulse waveform undershoot not reaching the reference level, and the maximum peak value exceeds the predetermined upper limit level Judgment is made as an excessive wave height, and if there is a corresponding noise, the subsequent noise determination is skipped, all are regarded as noise waveforms, and those not corresponding to them are regarded as signal waveforms, and each of the above signal waveforms and the above noise waveforms Digital pulse is output corresponding to, waveform data of all input pulses along with analysis time and noise judgment grounds Waveform analyzing means for outputting a maximum peak value, minimum peak value as the waveform data package,
First counting means for inputting and counting digital pulses output corresponding to the signal waveform and outputting a signal count value;
A second counting means for inputting and counting a digital pulse output corresponding to the noise waveform and outputting a noise count value;
Input the digital pulse output corresponding to the above signal waveform, perform the predetermined weighting and add, and input the negative feedback pulse of the repetition frequency corresponding to the signal integrated value, perform the predetermined weighting and subtract Signal integrating means for outputting a signal integrated value of signal integrated value = (1 / constant) 1n (signal count rate);
The waveform data package, the signal count value, and the noise count value are input, a signal count rate is obtained based on the signal integrated value, and the signal count rate high alarm is detected when the signal count rate exceeds a predetermined level. The noise count rate is calculated as a ratio of the number of noise waveforms to the total number of waveforms based on the signal count value and the noise count value, and the signal count rate high alarm is detected when the noise mix rate exceeds a predetermined level. And a calculation means for outputting a noise entry alarm under an AND condition, and outputting the signal count rate, the signal count rate high alarm, the noise mixing rate, the noise entry alarm, and the calculation time as a calculation processing data package,
Storage means for storing the arithmetic processing data package and the waveform data package;
The signal count rate is always displayed, and when the signal count rate high alarm is transmitted from the arithmetic means, the signal count rate high alarm is displayed together with the signal count rate, and the noise approach alarm is transmitted from the arithmetic means. Display means for displaying the noise approach alarm together with the noise mixing rate,
The computing means always updates the latest predetermined number of processing data packages and the latest predetermined number of waveform data packages stored in the storage means, and has a predetermined number of calculation cycles for the noise count value and the signal count value. The signal movement integrated value obtained by integrating the signal count value and the noise movement integrated value obtained by integrating the noise count value are obtained, and the noise movement integrated value / (signal movement integrated value) is obtained from the signal movement integrated value and the noise movement integrated value. (+ Noise movement integrated value) is obtained, and the above-mentioned noise mixing rate is obtained.   The radiation monitoring apparatus according to claim 1, wherein the trigger level of the waveform measuring unit is set to a signal waveform lower limit level.   The display means displays a waveform with a perpendicular line connecting the maximum peak value and the minimum peak value, displays the pulse width abnormality with the thickness of the perpendicular line, and displays a reference level, a wave height excess threshold level, a reverse polarity wave height over threshold value. The radiation monitoring apparatus according to claim 1, wherein a level and an undershoot shortage threshold level are displayed.   6. The radiation monitoring apparatus according to claim 5, wherein the display means identifies and displays the type of noise waveform by changing the color of the perpendicular line.   7. The radiation monitoring apparatus according to claim 5, wherein the display means visualizes and displays the perpendicular density by filling a time when waveform data is not extracted as a reference level.

Images