JP3304566B2 - Radiation measurement device - Google Patents
Radiation measurement deviceInfo
- Publication number
- JP3304566B2 JP3304566B2 JP28258393A JP28258393A JP3304566B2 JP 3304566 B2 JP3304566 B2 JP 3304566B2 JP 28258393 A JP28258393 A JP 28258393A JP 28258393 A JP28258393 A JP 28258393A JP 3304566 B2 JP3304566 B2 JP 3304566B2
- Authority
- JP
- Japan
- Prior art keywords
- time
- value
- integration
- past
- added value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Measurement Of Radiation (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、放射線測定装置特にア
ベレージング期間を自動的に最適化できる放射線測定装
置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radiation measuring apparatus, and more particularly to a radiation measuring apparatus capable of automatically optimizing an averaging period.
【０００２】[0002]
【従来の技術】環境放射線等は、その線量率が経時的に
激しく変動しており、放射線測定装置にて測定された線
量率を仮にそのまま表示すると、その値を正確に読み取
ることができない。特に、デジタル表示ではその傾向が
強い。2. Description of the Related Art The dose rate of environmental radiation or the like fluctuates drastically with time, and if the dose rate measured by a radiation measuring device is displayed as it is, its value cannot be read accurately. In particular, the tendency is strong in digital display.
【０００３】そこで、従来の放射線測定装置において
は、アベレージング機能が付加されており、平滑化によ
って表示を見やすくしている。そして、一般的な装置に
おいては、時定数が切り換えられるようになっており、
放射線の線量率変動の激しさに応じて人為的にアベレー
ジング期間を切り換えることができる。なお、そのアベ
レージング（平滑化）には各種の方式が適用される。Therefore, in the conventional radiation measuring apparatus, an averaging function is added, and the display is made easier to see by smoothing. And in a general device, the time constant can be switched,
The averaging period can be artificially switched according to the intensity of the radiation dose rate fluctuation. Various methods are applied to the averaging (smoothing).
【０００４】[0004]
【発明が解決しようとする課題】従来の装置において、
アベレージングに係る期間が固定的の場合には、線量率
の変動に応じた適切な平滑化を行うことができない。ま
た、人為的に時定数を切り換える場合には、最適化され
ないことが多く、また煩雑である。特に、装置の操作に
熟知している者以外が操作した場合、時定数が大きすぎ
ると応答性が悪くなり、逆に時定数が小さすぎると変動
が急激すぎて値を読むのが困難となる。SUMMARY OF THE INVENTION In a conventional device,
If the averaging period is fixed, it is not possible to perform appropriate smoothing according to the variation of the dose rate. In addition, when the time constant is switched artificially, it is often not optimized and complicated. In particular, when operated by a person other than a person who is familiar with the operation of the apparatus, if the time constant is too large, the response becomes poor, and if the time constant is too small, the fluctuation is too rapid to read the value. .
【０００５】本発明は、上記従来の課題に鑑みなされた
ものであり、その目的は、線量率の変動に追従して自動
的に最適なアベレージング期間を設定できる放射線測定
装置を提供することにある。The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a radiation measuring apparatus capable of automatically setting an optimum averaging period in accordance with a change in a dose rate. is there.
【０００６】[0006]
【課題を解決するための手段】上記目的を達成するため
に、本発明は、放射線検出器と、各時刻で検出された放
射線の測定値を時系列順で格納する記憶手段と、各時刻
ごとに、その時刻の測定値を含めつつそこから過去に戻
って所定個数の測定値を加算し、これにより各時刻ごと
に加算値を求める手段と、現時点の加算値に基づいて、
過去の各時刻の加算値と比較される上下しきい値を設定
する手段と、過去の各時刻における加算値と前記上下し
きい値とを比較することにより、現時点から過去に戻っ
て最初に加算値が前記上下しきい値を越える判定時刻を
判定し、現時点から判定時刻までの期間を測定値の積算
を行う積算幅とする積算幅判定部と、前記積算幅内にお
ける現時点の測定値から判定時刻の測定値までを積算し
て積算値を求める積算部と、前記積算値から求められる
測定結果を表示する表示器と、を含むことを特徴とす
る。To achieve the above Symbol purposes SUMMARY OF THE INVENTION The present invention provides a radiation detector, memory means for storing in chronological order the detected measured values of the radiation at each time, each time Each time, including a measured value at that time, return to the past from there and add a predetermined number of measured values, thereby obtaining an added value for each time, based on the added value at the present time,
Means for setting an upper and lower threshold value to be compared with the added value at each past time, and comparing the added value at each past time with the upper and lower threshold value to add the first time from the present time to the past. An integration width determination unit that determines a determination time at which the value exceeds the upper and lower thresholds and determines a period from the current time to the determination time as an integration width for integrating measurement values; and a determination from a current measurement value within the integration width. It is characterized by including an integrating section for integrating up to a measured value at a time to obtain an integrated value, and a display for displaying a measurement result obtained from the integrated value.
【０００７】[0007]
【作用】上記構成によれば、現時点の測定値を含む複数
の測定値を要素として、加算値が演算され、その加算値
に従ってアベレージングに係る期間（積算幅）が決定さ
れる。そして、その積算幅内の測定値が積算されて、そ
れに基づいて測定結果が演算され、最終的にその測定結
果が表示される。According to the above arrangement, an added value is calculated using a plurality of measured values including the current measured value as an element, and a period (accumulated width) related to averaging is determined according to the added value. Then, the measured values within the integrated width are integrated, the measured result is calculated based on the integrated value, and the measured result is finally displayed.
【０００８】[0008]
【０００９】[0009]
【実施例】以下、本発明の好適な実施例を図面に基づい
て説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings.
【００１０】図１には、本発明に係る放射線測定装置の
全体構成が示されている。また、図２には、本発明の原
理が示されており、まず、図２を用いて本発明の原理に
ついて説明する。FIG. 1 shows the overall configuration of a radiation measuring apparatus according to the present invention. FIG. 2 illustrates the principle of the present invention. First, the principle of the present invention will be described with reference to FIG.
【００１１】図２において、（Ａ）には、放射線の測定
値である計数率の変動が経時的に示されている。すなわ
ち、横軸は時間軸であり、縦軸は計数率である。ここ
で、ｔはＡ／Ｄ変換器（図示せず）のサンプリング期間
を示しており、Ｔは後述するように、分散値演算のため
の期間を示している。なお、Ｔは各時刻の計数率毎に設
定され、各期間Ｔは相互に重複している。In FIG. 2, (A) shows the variation of the counting rate, which is a measured value of radiation, with time. That is, the horizontal axis is the time axis, and the vertical axis is the count rate. Here, t indicates a sampling period of an A / D converter (not shown), and T indicates a period for calculating a variance value, as described later. Note that T is set for each count rate at each time , and the periods T overlap each other.
【００１２】（Ｂ）には、各期間Ｔについての加算値
（各時刻の加算値）を経時的にグラフ化したものが示さ
れている。FIG. 3B shows an added value for each period T.
(Addition value at each time) is shown as a graph over time.
【００１３】（Ａ）に示されるように、計数率は経時的
に変動しており、そのままの測定値を表示したのでは、
表示を読むことが困難である。As shown in (A), the counting rate fluctuates with time, and if the measured values are displayed as they are,
It is difficult to read the display.
【００１４】そこで、本発明では、計数率のばらつきの
大きさ（標準偏差）を求め、それに基づいてアベレージ
ング期間１００を設定する。すなわち、Ｔが仮に３（所
定個数に相当）であるとすると、現時点の加算値Ｎ
0 は、 Ｎ0 ＝ｎ0 ＋ｎ1 ＋ｎ2 となり、そのＮ0 を基準として、上下のしきい値とし
て、 （上）Ｎ0 ＋Ｋ√Ｎ0 （下）Ｎ0 −Ｋ√Ｎ0 を設定する。ただし、ｎi は計数率であり、Ｋは定数で
ある。Therefore, in the present invention, the magnitude (standard deviation) of the variation of the counting rate is obtained, and the averaging period 100 is set based on the obtained value. That is, if T is 3 (place
Is equivalent to the fixed number) , and the current addition value N
0, N 0 = n 0 + n 1 + n 2 , and the its N 0 as a reference, as the upper and lower thresholds, to set the (upper) N 0 + K√N 0 (bottom) N 0 -K√N 0 . Here, ni is a counting rate, and K is a constant.
【００１５】そして、（Ｂ）に示すように、現時点から
戻って、上方のしきい値又は下方のしきい値を最初に超
える時刻（判定時刻）までを積算幅１００とする。次
に、その積算幅内で計数率の積算が行われ、計数率の個
数で積算値を割れば、最終的に平均化された計数率を求
めることができる。Then, as shown in (B), the time from the present time to the time when the upper threshold value or the lower threshold value is exceeded for the first time (determination time) is defined as the integration width 100. Next, counting rate integration is performed within the integration width, and finally the averaged counting rate can be obtained by dividing the integrated value by the number of counting rates.
【００１６】すなわち、本発明では、測定値のばらつき
の大きさを積算幅の大きさに連動することによって、最
適な平滑化期間を自動的に設定するものである。That is, in the present invention, the optimal smoothing period is automatically set by linking the magnitude of the variation of the measured value with the magnitude of the integration width.
【００１７】図１に戻って、放射線検出器１０からの検
出信号は、アンプやスケーラなどを通過した後、メモリ
１２に格納される。ここで、その格納は図２（Ａ）に示
したように、時系列的に行われ、常に現在の時刻から一
定時間内の計数率が保持される。すなわち、メモリ１２
は例えばリングバッファなどで構成される。なお、図１
においては、現在測定された計数率がｎ0 で示され、そ
れより前の計数率がｎ1 、ｎ2 …で示されている。Returning to FIG. 1, the detection signal from the radiation detector 10 is stored in the memory 12 after passing through an amplifier, a scaler and the like. Here, the storage is performed in chronological order as shown in FIG. 2A, and the count rate within a certain time from the current time is always held. That is, the memory 12
Is composed of, for example, a ring buffer. FIG.
In, the currently measured count rate is indicated by n 0 , and the count rate before that is indicated by n 1 , n 2 .
【００１８】メモリ１２の出力は、積算部１４に出力さ
れると共に、加算部１６に出力されている。The output of the memory 12 is output to the accumulator 14 and also to the adder 16.
【００１９】加算部１６では、図２（Ａ）から（Ｂ）へ
の変換、すなわち、各期間Ｔでの加算を行う。図では説
明のためＴ＝３としているが、Ｔは例えば５〜２０程度
が適当である。なお、加算部１６は、入力の切換えと出
力の切換えとを行うことにより、基本的に１つの加算器
で構成できる。The adder 16 performs the conversion from FIG. 2A to FIG. 2B, that is, the addition in each period T. In the figure, T = 3 for the sake of explanation, but T is suitably, for example, about 5 to 20. The addition unit 16 can be basically configured by one adder by switching between input and output.
【００２０】メモリ１８には、図２（Ｂ）で示した各加
算値が経時的に格納される。そして、積算幅判定部２０
は、加算値Ｎ0 を基準として、しきい値Ｎ0 ＋Ｋ√Ｎ0
及びＮ0 −Ｋ√Ｎ0 を設定し、現時点から戻って最初に
いずれかのしきい値を超える加算値を判定する。そし
て、その加算値までの期間を積算幅１００として積算部
１４へ出力する。Each of the added values shown in FIG. 2B is stored in the memory 18 over time. Then, the accumulated width determination unit 20
, Based on the addition value N 0, the threshold N 0 + K√N 0
And N 0 −K√N 0 are set, and an added value exceeding one of the thresholds is determined first from the current time. Then, the period up to the added value is output to the integrating unit 14 as the integrated width 100.
【００２１】一方、積算部１４では、積算幅１００内の
計数率をすべて積算し、その積算値を表示演算部２２へ
出力する。On the other hand, the integrating section 14 integrates all the counting rates within the integration width 100 and outputs the integrated value to the display calculating section 22.
【００２２】表示演算部２２では、その積算値を積算個
数で割ることによって平均化を行う。そして、その平均
値に対して所定の係数を乗算することにより、線量率が
演算され、それが表示器２４にて測定値として表示され
る。The display calculation unit 22 performs averaging by dividing the integrated value by the integrated number. Then, the dose rate is calculated by multiplying the average value by a predetermined coefficient, and the calculated dose rate is displayed on the display 24 as a measured value.
【００２３】ちなみに、測定値の表示は、デジタル表示
及びアナログ表示のいずれでも可能であるが、特にデジ
タル表示の場合には平滑化の自動設定の意義が大きい。
そのデジタル表示においては、統計的に有意な有効桁の
部分とそれ以外の桁の部分を識別できるようにしてもよ
い。また、標準偏差の大きさを併せて表示するように構
成してもよい。そのための表示形態は各種の方式を適用
できる。By the way, the display of the measured value can be either digital display or analog display, but in the case of digital display in particular, the automatic setting of smoothing is significant.
In the digital display, a portion of a significant digit that is statistically significant and a portion of other digits may be identified. Also, the size of the standard deviation may be displayed together. Various forms can be applied to the display form for that.
【００２４】[0024]
【発明の効果】以上説明したように、本発明によれば、
線量率の変動に追従して自動的に最適なアベレージング
期間を設定できる。As described above, according to the present invention,
The optimum averaging period can be automatically set according to the variation of the dose rate.
【図１】本発明に係る放射線測定装置の全体構成を示す
図である。FIG. 1 is a diagram showing an overall configuration of a radiation measuring apparatus according to the present invention.
【図２】本発明の原理を示す図である。FIG. 2 is a diagram showing the principle of the present invention.
１２ メモリ １４ 積算部 １６ 加算部 １８ メモリ ２０ 積算幅判定部 １００ 積算幅 12 Memory 14 Integrator 16 Adder 18 Memory 20 Integral width determiner 100 Integral width
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) G01T 1/17 ──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. 7 , DB name) G01T 1/17
Claims (1)
る記憶手段と、 各時刻ごとに、その時刻の測定値を含めつつそこから過
去に戻って所定個数の測定値を加算し、これにより各時
刻ごとに加算値を求める手段と、 現時点の加算値に基づいて、過去の各時刻の加算値と比
較される上下しきい値を設定する手段と、 過去の各時刻における加算値と前記上下しきい値とを比
較することにより、現時点から過去に戻って最初に加算
値が前記上下しきい値を越える判定時刻を判定し、現時
点から判定時刻までの期間を測定値の積算を行う積算幅
とする積算幅判定部と、 前記積算幅内における現時点の測定値から判定時刻の測
定値までを積算して積算値を求める積算部と、 前記積算値から求められる測定結果を表示する表示器
と、 を含むことを特徴とする放射線測定装置。1. A radiation detector, storage means for storing, in chronological order, measured values of radiation detected at each time, and for each time, the measured value at that time is returned to the past while including the measured value at that time. Means for adding a predetermined number of measured values, thereby obtaining an added value for each time; and means for setting upper and lower thresholds to be compared with the added value at each past time based on the current added value. By comparing the added value at each time in the past with the upper and lower thresholds, it is possible to determine a determination time at which the added value exceeds the upper and lower thresholds from the present time and return to the past, and from the current time to the determination time. An integration width determining unit that sets the period of the integration as an integration width for integrating measurement values; an integration unit that integrates from a current measurement value within the integration width to a measurement value at a determination time to obtain an integration value; Displays measurement results required from A radiation measuring apparatus, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28258393A JP3304566B2 (en) | 1993-11-11 | 1993-11-11 | Radiation measurement device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28258393A JP3304566B2 (en) | 1993-11-11 | 1993-11-11 | Radiation measurement device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07134180A JPH07134180A (en) | 1995-05-23 |
| JP3304566B2 true JP3304566B2 (en) | 2002-07-22 |
Family
ID=17654391
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP28258393A Expired - Lifetime JP3304566B2 (en) | 1993-11-11 | 1993-11-11 | Radiation measurement device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3304566B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012158106A1 (en) * | 2011-05-13 | 2012-11-22 | Unfors Raysafe Ab | Radiation meter and method |
| US9029769B2 (en) | 2012-04-26 | 2015-05-12 | Mitsubishi Electric Corporation | Dose rate measuring apparatus |
| US11049625B2 (en) | 2016-11-25 | 2021-06-29 | Korea Advanced Institute Of Science And Technology | Nuclear fuel pellet with central burnable absorber |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4627650B2 (en) * | 2004-09-28 | 2011-02-09 | アロカ株式会社 | Radiation measuring instrument |
-
1993
- 1993-11-11 JP JP28258393A patent/JP3304566B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012158106A1 (en) * | 2011-05-13 | 2012-11-22 | Unfors Raysafe Ab | Radiation meter and method |
| US9470799B2 (en) | 2011-05-13 | 2016-10-18 | Unfors Raysafe Ab | Radiation meter and method |
| US9029769B2 (en) | 2012-04-26 | 2015-05-12 | Mitsubishi Electric Corporation | Dose rate measuring apparatus |
| US11049625B2 (en) | 2016-11-25 | 2021-06-29 | Korea Advanced Institute Of Science And Technology | Nuclear fuel pellet with central burnable absorber |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07134180A (en) | 1995-05-23 |
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