JPS59154347A - Measuring method of water content - Google Patents
Measuring method of water contentInfo
- Publication number
- JPS59154347A JPS59154347A JP58030039A JP3003983A JPS59154347A JP S59154347 A JPS59154347 A JP S59154347A JP 58030039 A JP58030039 A JP 58030039A JP 3003983 A JP3003983 A JP 3003983A JP S59154347 A JPS59154347 A JP S59154347A
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- JP
- Japan
- Prior art keywords
- density
- neutron
- measured
- water content
- gamma
- Prior art date
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Analysing Materials By The Use Of Radiation (AREA)
Abstract
Description
【発明の詳細な説明】
（イ）発明の分野
この発明は、中性子線検出により被測定物中に含有する
水分量全測定する水分量測定方法に関する。DETAILED DESCRIPTION OF THE INVENTION (a) Field of the Invention The present invention relates to a method for measuring the total amount of water contained in an object to be measured using neutron beam detection.
（ロ）従来技術とその問題点
従来より、たとえば土中に含有する水分量を測定するの
に、中性子線を利用する方法がある。この中性子線を利
用する水分量測定方法は、中性子線源より被測定物に中
性子線を放射し、散乱あるいけ透過による熱中性子線量
あるいは高速中性子線量を予め既知の水分量に対して対
照校正しておき、この校正式（又は校正曲線）を用いて
被測定物に対する実測中性子線量から水分量を定量する
ものである。この種の水分量測定方法において。(b) Prior art and its problems Conventionally, there is a method that uses neutron beams to measure, for example, the amount of water contained in soil. This method of measuring moisture content using neutron beams involves emitting neutron beams from a neutron beam source to the object to be measured, and then comparing and calibrating the thermal neutron dose or fast neutron dose due to scattering or transmission against a known moisture content. Then, this calibration formula (or calibration curve) is used to quantify the moisture content from the actually measured neutron dose to the object to be measured. In this type of water content measurement method.
従来の校正式は中性子線量を決定するのに水分量を唯一
の変数として扱っていた。これは被測定物中での中性子
の減速及び拡４散の効果が主として水分量の多少によっ
て決まるものであるからである。Traditional calibration formulas treat water content as the only variable in determining neutron dose. This is because the effects of deceleration and diffusion of neutrons in the object to be measured are mainly determined by the amount of water.
しかしながら厳密には中性子の減速及び拡散の効果は水
分量のみならず被測定物質の密度によっても影響を受け
るものであり、そのため−に記従来の水分量測定方法で
は、たとえば土質材料に対する水分量測定の場合、同じ
材料でも締固められた密度によって中性子水分計によっ
て評価される水分量の１直が異るという不都合が生じ、
どうし７ても被測定物の密度を一定にしなければならな
いという制約があった。However, strictly speaking, the effects of neutron moderation and diffusion are affected not only by the moisture content but also by the density of the substance to be measured. In this case, there is an inconvenience that the moisture content evaluated by a neutron moisture meter differs depending on the compacted density even if the material is the same.
However, there was a constraint that the density of the object to be measured had to be constant.
しかしながら、一般に密度金−定にすることはきわめて
困難であり、実測定においては密度の影響を無視して測
定音せねばならず、そのため測定精度が粗くなるという
欠点があった。However, it is generally extremely difficult to make the density constant, and in actual measurements, the influence of density must be ignored when measuring the sound, which has the disadvantage of poor measurement accuracy.
（ハ）発明の目的
この発明の目的は、上記従来の中性子利用の水分量測定
方法の欠点を解消し、被測定物の密度が如何なる鎖であ
っても、その影響を受けることなく、精度の高い測定の
可能な水分量測定方法を提供するにある。(c) Purpose of the Invention The purpose of the present invention is to eliminate the drawbacks of the conventional water content measurement method using neutrons, and to improve accuracy regardless of the density of the chain of the object to be measured. The object of the present invention is to provide a method for measuring moisture content that can be highly measured.
に）発明の構成
上記目的を達成するために、この発明の水分量測定方法
は、中性子線源及びガンマ線源を含む放射線源と中性子
検出器及びガンマ線検出器を含む放射線検出器との間に
被測定物を配し、前記中性子線源から前記被測定物を経
て前記放射線検出器に到達する中性子線量を前記中性子
検出器で検出し、前記ガンマ線源から前記被測定物を経
て前記放射線検出器に到達するガンマ線量全前記ガンマ
線検出器で検出し、検出された中姓子線量、ガンマ線世
に基づいて被測定物に含有する水分量を測定するように
している。すなわちこの発明の水分量測定方法は、実測
中性子線量とともにガンマ線量により被測定物の密度を
検出し、この密度により校正式を補正して水分量全測定
するものである・ここで、この発明の水分測定法の測定
原理を被測定物全透過してくる高速中性子線量から水分
量全測定する場合について概説すると。B) Structure of the Invention In order to achieve the above object, the moisture content measuring method of the present invention includes arranging an object to be measured, detecting a neutron dose reaching the radiation detector from the neutron source via the object to be measured, and detecting a neutron dose reaching the radiation detector from the gamma ray source via the object to be measured; The total amount of gamma rays that arrive is detected by the gamma ray detector, and the amount of water contained in the object to be measured is measured based on the detected middle dose and gamma rays. In other words, the moisture content measurement method of the present invention detects the density of the object to be measured using gamma rays as well as the measured neutron dose, and corrects the calibration formula using this density to measure the total moisture content. The following is an overview of the measurement principle of the moisture measurement method when measuring the total moisture content from the amount of fast neutron radiation that completely passes through the object to be measured.
中性子線源より放出され被測定物を経て中性子検出？ｊ
６で検出される中性子線量すなわち水分計数比率 ｗは
、乾燥密度１ｄ及び水分量ｗ Ｉ（全変数とする関数
Ｒ〜へ−ｆ（Ｙｄ、 ｗＨ） ・・・
■であり。Neutrons emitted from a neutron beam source and detected after passing through the measured object? j
The neutron dose detected in step 6, that is, the moisture counting ratio w, is the dry density 1d and the moisture content w I (to the function R with all variables - f (Yd, wH)...
■It is.
ここで、乾燥密度γｄを加味して補正された水分量を等
測水分量Ｗ Ｈとすると。Here, let us assume that the moisture content corrected by taking into account the dry density γd is the equal measured moisture content W H.
水分計数比率Ｒｗは
Ｒｗ＝ａｅ”晶 ・・・・・・■ただし
ａ、ｂ：定数
ｗ Ｈ＝ ｗ Ｈ＋ａ丁ｄ
α：定数
で表わせる。また乾燥密度γｄは
Ｙｄ ： ｒｔ −Ｗ ＩＴ −・・
■ただし、γＬ：湿潤密度
であるから９等価水分量ｗＩＩは
ｗＨ＝βＷＨ＋ ６丁も ・・
・ ・・■ただしβ、δ：定数
で表わせる。上記００式より。Moisture counting ratio Rw can be expressed as Rw = ae'' crystal...where a, b: constant w H = w H + a d α: constant. Also, dry density γd is Yd: rt - W IT -.・
■However, since γL is the wet density, the 9 equivalent water content wII is wH = βWH + 6 pieces...
・・・■However, β, δ: Can be expressed as constants. From the above formula 00.
Ｒｗ ＝ ｎｏ−ｂ（８ｗ１珪δγＬ）１．１．■この
０式を変形すると水分＠ ｗ Ｉ−１はｗＨ＝ Ｂｌｎ
（Ａ−Ｒｗ−１−Ｃｒｔ ） −・−・■ただ
し Ａ、Ｂ、Ｃ：定数
となる。Rw = no-b (8w1 silicon δγL) 1.1. ■If you transform this equation 0, water @ w I-1 is wH = Bln
(A-Rw-1-Crt) -・-・■ However, A, B, C: are constants.
この０式において水分計数率比ＲＷ ｊｉ中性子検出器
で、湿潤密度７ｔはガンマ線検出器で、それぞれ実測可
能であるから、予じめ既知の水分量および密度により、
十：°記■式の定数Ａ、Ｂ、Ｃｆｆ、決定しておき、と
の■式全校正式とし、水分Ｗｉ数比率Ｒｗと湿潤密度Ｔ
もの実測鎖から密度補正′ｆｆ：なした真の水分量ｗ
Ｈを演算することができる。In this equation 0, the moisture count rate ratio RW ji can be measured using a neutron detector and the wet density 7t can be measured using a gamma ray detector, so based on the previously known moisture content and density,
10: Determine the constants A, B, and Cff of the ■ formula in °, and make the entire calibration formula for the ■ formula, and the moisture Wi number ratio Rw and the wet density T.
Density correction from the actual measurement chain'ff: true water content w
H can be calculated.
（ホ）実施例の説明。(E) Description of Examples.
以下、実施例によりこの発明をさらに詳細に説明する。Hereinafter, this invention will be explained in more detail with reference to Examples.
第１図は、この発明が実施される水分・密度同時測定器
の構成全示す概略図である。同図において水分・密度同
時測定器１は、放射線源部２．被測定物３全収納する容
器４．放射線検出部５及び演算ユニット部５から構成さ
れている。FIG. 1 is a schematic diagram showing the entire configuration of a simultaneous moisture and density measuring device in which the present invention is implemented. In the figure, the simultaneous moisture/density measuring device 1 has a radiation source section 2. Container for storing all 3 objects to be measured 4. It is composed of a radiation detection section 5 and a calculation unit section 5.
８をシールドする鉛シールド９．アクリルシールド１０
とから構成されている。Lead shield shielding 89. acrylic shield 10
It is composed of.
放射線検出部５はガンマ線検出管１１と高速中性子検出
器１２とから構成されている。The radiation detection section 5 is composed of a gamma ray detection tube 11 and a fast neutron detector 12.
演算ユニット部６ば、放射線検出部５によυ検出される
高速中性子線量及びガンマ線量により。The calculation unit section 6 uses the fast neutron dose and gamma dose detected by the radiation detection section 5.
予じめ記１意する校Ｅ式により敲測定物の真の水分量全
演算するとともに、その水分酸を密度とともに表示記録
するように構成されている・Ｌ″ｌ上のように横殴され
ろ水分・密度同時測定器１により岐測定材斜の水分量全
測定する場合・には。It is configured to calculate the total true moisture content of the measured object using the calibration E formula described in advance, and to display and record the water acid content along with the density. When measuring the total amount of water in the slant of the material to be measured using the simultaneous filtrate and density measuring device 1.
彼測定旧判３を容゛尋４に入れ中性子禄源７及びガンマ
線源８より中性子線及びガンマ線全敲測定利寧・１３に
放射すると、彼測定材料６の水分量及び密度に応じて高
速中性子及びガンマ線が被測定物中を透過してくるので
、この透過してきた高速中性子線量を高速中性子検出器
１２でイ灸出し、力′ンマ緬）准をガンマイ１ｌｊｌ
検出管１１で検出する。このガンマ琲検出管１１で検出
されるガンマ線量は密度に対応するので、このガンマ線
ト改により先ず敲叫定物の密度が検出される。丑だ高速
中性子検出器１２で検出をねる高速中性子線量は従来の
測定法におりる水分量に対応するので、この高速中性子
点景により１次的な水分酸が得られる。演算ユニット部
６では検出された密度及び１次水分量を、予じめ記憶す
る密度補正頃を含む 正式に数１直代入して真の水分量
を演算する。この真の水分量は密度補正されたものなの
で、密度の＋１１禅による影１イを受けないものが得ら
れる。この真の水分量は密度とともに表示される。When the old measurement material 3 is placed in the chamber 4 and neutron and gamma rays are emitted from the neutron source 7 and the gamma ray source 8 to the measurement material 13, fast neutrons are generated depending on the moisture content and density of the measurement material 6. Since the gamma rays and gamma rays pass through the object to be measured, the fast neutron detector 12 moxibusters the transmitted fast neutron dose and converts the force to gamma rays.
It is detected by the detection tube 11. Since the gamma ray dose detected by this gamma ray detection tube 11 corresponds to the density, the density of the screaming object is first detected by this gamma ray detection tube. Since the fast neutron dose detected by the fast neutron detector 12 corresponds to the amount of water in the conventional measurement method, primary water acid can be obtained from this fast neutron sight. The arithmetic unit 6 calculates the true moisture content by formally directly substituting the detected density and primary moisture content into Equation 1, including the density correction data stored in advance. Since this true water content is density-corrected, it is obtained without being affected by the +11 density effect. This true moisture content is displayed along with the density.
第２図は密度補正を無視した従来の水分校正式すなわち
水分量と中性子線量（水分ｔＩ数率比）の関係と校正試
験の実測点（水分酸１托知のザングルに対する中性子ｌ
涙斌の測定（直）の分布を示す図でを）る。この図Ｖこ
よれば、校正曲線Ａからの実測点のバフツキが大きく、
この水分校正式（重用による従来の水分微測５？方法は
、水分４４１１定り度が低いものであることがよくわか
る。Figure 2 shows the conventional moisture calibration formula that ignores density correction, that is, the relationship between moisture content and neutron dose (moisture tI number rate ratio), and the actual measurement points of the calibration test (neutron l
Figure 1 shows the distribution of lacrimal lacrimal measurements. According to this figure V, the buffiness of the actual measurement points from the calibration curve A is large.
It is clear that the conventional moisture micromeasurement method using this moisture calibration formula (5?) has a low moisture content 4411 consistency.
第６図はこの発明の−に記実施例の水分４父止式（密Ｗ
Ｙｉ ｊＴＥ頃を含む）と佼正試ｊ倹の実損１１点の
分布を示す図である。なおこの図で（車用した密度Ｍ１
正係数は２７へ２図に示した校正データを用いて水分酸
上密度の要因について統計分析全行った結果に基いて定
めている。この図によれば、第２図に示す場合と比較し
て明かなように１校正曲腺Ｂからの実測点のバフツキが
小さく、冒度顛正を尋人することによって、水分測定精
度が著しく改善されることがわかる。Figure 6 shows the moisture 4-stop type (dense W) of the embodiment described in - of this invention.
It is a diagram showing the distribution of 11 points of actual loss of Yi (including around TE) and Kaya test. In addition, in this figure (density M1 for cars)
The positive coefficient is determined based on the results of a complete statistical analysis of the factors of water-acid density using the calibration data shown in Figure 27. According to this figure, compared to the case shown in Fig. 2, it is clear that the buffiness of the actual measurement point from the first calibration curve B is small, and the accuracy of moisture measurement is significantly improved by performing the first calibration. I can see that it will be improved.
なお、上記実施例においては、被測定物を透過してくる
高速中性子線量を検出して水分量全測定する場合につい
て説明したが、この発明はこれに限ることなく、高速中
性子線量の・演出に代えて熱中性子線量を検出する場合
にも適用される。In the above embodiment, a case has been described in which the total water content is measured by detecting the fast neutron dose that passes through the object to be measured, but the present invention is not limited to this, and can be applied to the production of fast neutron doses. Alternatively, it is also applied when detecting thermal neutron dose.
また」上記実施例において中性子線量検出とガンマ線量
検出を同時になす場合について説明したが。Furthermore, in the above embodiment, a case was described in which neutron dose detection and gamma ray dose detection were performed simultaneously.
これら中性子線量検出とガンマ線量検出は時間音ずらし
て行なうものであってもよい。These neutron dose detection and gamma dose detection may be performed with a time shift.
さらにまた」−記実施例において被測定物は容器に収納
しているが、この発明はこれに限ることなく、直接地表
層十の水分量・密度測定にも適用できるものであること
はいうまでもない。Furthermore, although the object to be measured is housed in a container in the embodiment described above, the present invention is not limited to this, and it goes without saying that this invention can also be applied to directly measuring the moisture content and density of the earth's surface layer. Nor.
（へ）発明の効果
以上のようにこの発明によれば、中性イ検出による水分
量の検出のみならず、ガンマ線検出による密度測定全行
ない、この密度測定値によυ中性子検出による水分量を
補正するものであるから。(F) Effects of the Invention As described above, according to the present invention, not only the moisture content is detected by neutral i detection, but also the density is measured by gamma ray detection, and the moisture content by υ neutron detection is determined by this density measurement value. Because it is a correction.
密度の相違によるバラツキ導気にする必要がなく精度の
高い水分量測定を行なうことができる。しかも、中性子
線量とガンマ線量とは同時に検出することもできるから
測定時間をかけることなく。There is no need to vary the air conductivity due to differences in density, and moisture content can be measured with high accuracy. Moreover, the neutron dose and gamma ray dose can be detected at the same time, so there is no need to waste time on measurement.
水分量のほかに密度も測定できるという利点もある。Another advantage is that it can measure density as well as moisture content.
第１図はこの発明が実施される水分量・密度同時測定器
の構成を示す概略図、第２図は従来方法による水分校正
式及び校正試験の実…１ｊ点分布を示す図、第３図はこ
の発明の実施例による水分校正式及び校ＩＦ試験の実測
点分布を示す図である。
２：放射線源部、乙：被測定物、 ５：放射線検出部
、 ６：演算ユニット部。
７：中性子線源、 ８：ガンマ線源、 １１：ガン
マ線検出管、 １２：高速中性子検出器。
Ｗ 許出ｔｎ 人 ソイルアンドロックエンジニ
アリング株式会社
代理人 弁卯士 中 村 茂 信
第１図
水令量 ＷＨFig. 1 is a schematic diagram showing the configuration of a simultaneous water content/density measuring device in which the present invention is implemented, Fig. 2 is a diagram showing the moisture calibration formula and the actual calibration test result by the conventional method, and Fig. 3 is a diagram showing the 1j point distribution. FIG. 2 is a diagram showing the actual measurement point distribution of a moisture calibration formula and a calibration IF test according to an embodiment of the present invention. 2: Radiation source section, B: Object to be measured, 5: Radiation detection section, 6: Computation unit section. 7: Neutron source, 8: Gamma ray source, 11: Gamma ray detection tube, 12: Fast neutron detector. W Authorization Person Soil and Rock Engineering Co., Ltd. Agent Attorney Shigeru Nakamura Figure 1 Water Order WH
Claims (1)
子検出器及びガンマ線検出器を含む放射線検出器との間
に被測定物を配し、前記中性子線源から前記被測定物を
経て前記放射線検出器に到達する中性子線量を前記中性
子検出器で検出し、前記ガンマ線源から前記被測定物を
経て前記放射線検出器に到達するガンマ線量を前記ガン
マ線検出器で検出し、検出された中性子線量。 ガンマ線量に基づいて、被測定物に含有する水分量を測
定することを特徴とする水分量測定方法。(1) An object to be measured is arranged between a radiation source including a neutron beam source and a gamma ray source and a radiation detector including a neutron detector and a gamma ray detector, and the radiation is transmitted from the neutron beam source through the object to be measured. A neutron dose that reaches the detector is detected by the neutron detector, a gamma ray dose that reaches the radiation detector from the gamma ray source via the object to be measured is detected by the gamma ray detector, and the detected neutron dose is detected. A moisture content measuring method characterized by measuring the moisture content in a measured object based on gamma ray dose.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58030039A JPS59154347A (en) | 1983-02-23 | 1983-02-23 | Measuring method of water content |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58030039A JPS59154347A (en) | 1983-02-23 | 1983-02-23 | Measuring method of water content |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59154347A true JPS59154347A (en) | 1984-09-03 |
Family
ID=12292676
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58030039A Pending JPS59154347A (en) | 1983-02-23 | 1983-02-23 | Measuring method of water content |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59154347A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4884288A (en) * | 1985-12-31 | 1989-11-28 | Commonwealth Scientific And Industrial Research Organization | Neutron and gamma-ray moisture assay |
| WO2004057318A1 (en) * | 2002-12-20 | 2004-07-08 | Force Technology | An apparatus and a mehtod of deteting hydrogen by use of a newtron source |
| JP2005030974A (en) * | 2003-07-09 | 2005-02-03 | Japan Highway Public Corp | Method of measuring moisture content in fresh concrete, and moisture content measuring apparatus used for same |
| JP2018128372A (en) * | 2017-02-09 | 2018-08-16 | 株式会社安藤・間 | Measuring method of bentonite mixed soil and measuring device of bentonite mixed soil |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS527645U (en) * | 1975-07-03 | 1977-01-19 | ||
| JPS5763440A (en) * | 1980-10-03 | 1982-04-16 | Japan Atom Energy Res Inst | Moisture measuring method |
-
1983
- 1983-02-23 JP JP58030039A patent/JPS59154347A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS527645U (en) * | 1975-07-03 | 1977-01-19 | ||
| JPS5763440A (en) * | 1980-10-03 | 1982-04-16 | Japan Atom Energy Res Inst | Moisture measuring method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4884288A (en) * | 1985-12-31 | 1989-11-28 | Commonwealth Scientific And Industrial Research Organization | Neutron and gamma-ray moisture assay |
| WO2004057318A1 (en) * | 2002-12-20 | 2004-07-08 | Force Technology | An apparatus and a mehtod of deteting hydrogen by use of a newtron source |
| US7294846B2 (en) | 2002-12-20 | 2007-11-13 | Force Technology | Apparatus and a method of detecting hydrogen in an object by use of a neutron |
| JP2005030974A (en) * | 2003-07-09 | 2005-02-03 | Japan Highway Public Corp | Method of measuring moisture content in fresh concrete, and moisture content measuring apparatus used for same |
| JP2018128372A (en) * | 2017-02-09 | 2018-08-16 | 株式会社安藤・間 | Measuring method of bentonite mixed soil and measuring device of bentonite mixed soil |
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