JPH0318914Y2 - - Google Patents
Info
- Publication number
- JPH0318914Y2 JPH0318914Y2 JP18793181U JP18793181U JPH0318914Y2 JP H0318914 Y2 JPH0318914 Y2 JP H0318914Y2 JP 18793181 U JP18793181 U JP 18793181U JP 18793181 U JP18793181 U JP 18793181U JP H0318914 Y2 JPH0318914 Y2 JP H0318914Y2
- Authority
- JP
- Japan
- Prior art keywords
- calibration
- hopper
- thermal
- proportional counter
- neutron
- 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
Links
- 239000006096 absorbing agent Substances 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims 1
- 239000000843 powder Substances 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 229910052793 cadmium Inorganic materials 0.000 description 2
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000011358 absorbing material Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001915 proofreading effect Effects 0.000 description 1
Landscapes
- Analysing Materials By The Use Of Radiation (AREA)
Description
【考案の詳細な説明】
本考案は、粉体等の被測定物の含水率を測定す
る中性子水分計に関する。[Detailed Description of the Invention] The present invention relates to a neutron moisture meter that measures the moisture content of a material to be measured such as powder.
中性子水分計の校正方法には、水分計ホツパー
内を空にして、かつ乾燥させてホツパー内の水分
を無くしてから一定の含水率相等の校正板をホツ
パー及びBF3比例計数管間に固定して校正する方
法、あるいはBF3比例計数管を所定の設置場所よ
り取り外してから校正する方法等があつた。しか
し、いずれも校正に多数の処理及び時間を必要と
していた。 To calibrate a neutron moisture meter, empty the moisture meter hopper, dry it to eliminate moisture in the hopper, and then fix a calibration plate for a certain moisture content phase between the hopper and the BF 3 proportional counter tube. There were two methods: calibrating the BF 3 proportional counter, or removing the BF 3 proportional counter from its designated installation location and calibrating it. However, all of these require a lot of processing and time for proofreading.
本考案の目的は、校正時にホツパー内の水分量
の有無に関係なく校正できるように、水分計ホツ
パーからの熱中性子を熱中性子吸収体で遮蔽し
て、校正時には、BF3比例計数管が計数する熱中
性子を校正板から反射して来るものだけに限定す
る事であり、校正を簡便にしかも精度良く行うこ
とができる。 The purpose of this invention is to shield thermal neutrons from the moisture meter hopper with a thermal neutron absorber so that calibration can be performed regardless of the presence or absence of moisture in the hopper. By limiting the thermal neutrons reflected from the calibration plate to those reflected from the calibration plate, calibration can be performed easily and with high accuracy.
本考案は、校正時に校正板以外から発生する熱
中性子を熱中性子吸収板（カドミウム等）で吸収
して、BF3比例計数管で測定する熱中性子を含水
率既知の校正板（アクリル板等）のみから発生す
るものに限定する。 This invention absorbs thermal neutrons generated from sources other than the calibration plate during calibration with a thermal neutron absorption plate (cadmium, etc.), and then absorbs the thermal neutrons measured with a BF 3 proportional counter using a calibration plate with a known water content (acrylic plate, etc.). limited to those that arise only from
本考案の具体的な実施例を第１図に示す。１は
水分計ホツパーであり、粉体等の被測定物が置か
れる。２は241Am−Be等の高速中性子源である。
ホツパー内の被測定物の含水率測定時には、高速
中性子がホツパー内の粉体中に含まれる水分によ
つて減速され熱中性子になる。熱中性子は３の
BF3比例計数管により計数される。BF3比例計数
管によつて計数された熱中性子の数から、信号処
理装置４によりホツパー内の被測定物の含水率を
算出する。５は校正部を示す。第２図はこの校正
部の構成を示す。７はカドミウム等の熱中性子吸
収材でホツパー側に置かれる。８は校正板でアク
リル板等含水率既知の物質であり、BF3カウンタ
側に置かれる。６は校正部駆動装置であり、中性
子水分計校正時に校正部５をホツパーとBF3比例
計数管間に挿入する。校正時には５が挿入されて
高速中性子は８の校正板と１のホツパー内の粉体
で熱中性子となるが、校正に対してホツパーから
の熱中性子は不必要なので、７の中性子吸収材で
吸収することによつて、中性子水分計の校正を行
うことができる。 A specific embodiment of the present invention is shown in FIG. Reference numeral 1 denotes a moisture meter hopper, on which an object to be measured such as powder is placed. 2 is a fast neutron source such as 241 Am-Be.
When measuring the moisture content of the object to be measured in the hopper, fast neutrons are slowed down by the moisture contained in the powder in the hopper and become thermal neutrons. Thermal neutrons are 3
Counted by BF 3 proportional counter. The water content of the object to be measured in the hopper is calculated by the signal processing device 4 from the number of thermal neutrons counted by the BF 3 proportional counter. 5 indicates a calibration section. FIG. 2 shows the configuration of this calibration section. 7 is a thermal neutron absorbing material such as cadmium and is placed on the hopper side. Reference numeral 8 denotes a calibration plate, which is a material with a known moisture content such as an acrylic plate, and is placed on the BF 3 counter side. Reference numeral 6 denotes a calibration unit driving device, which inserts the calibration unit 5 between the hopper and the BF 3 proportional counter tube when calibrating the neutron moisture meter. During calibration, 5 is inserted and the fast neutrons become thermal neutrons with the calibration plate 8 and the powder in the hopper 1, but since the thermal neutrons from the hopper are unnecessary for calibration, they are absorbed by the neutron absorber 7. By doing this, the neutron moisture meter can be calibrated.
本考案を適用することにより、ホツパー内の状
態に左右されずに校正可能となるため、校正の手
順が簡単になる。又ホツパーの稼動率の向上が計
れる。 By applying the present invention, calibration can be performed without being affected by the state inside the hopper, and the calibration procedure becomes simple. Also, the operating rate of the hopper can be improved.
第１図は本考案の一実施例ブロツク図、第２図
は校正部説明図である。
１……水分計ホツパー、２……高速中性子源、
３……BF3比例計数管、４……信号処理装置、５
……校正部、６……校正部駆動装置、７……熱中
性子吸収板、８……校正板。
FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is an explanatory diagram of a calibration section. 1... Moisture meter hopper, 2... Fast neutron source,
3... BF3 proportional counter, 4...signal processing device, 5
... Calibration unit, 6... Calibration unit drive device, 7... Thermal neutron absorption plate, 8... Calibration plate.
Claims (1)
から高速中性子を照射し前記被測定物の水分によ
り減速散乱する熱中性子をBF3比例計数管で計数
するようにした中性子水分計において、既知の一
定の水分相当の熱中性子を減速散乱する校正板と
熱中性子吸収体を一体にした校正装置と、該校正
装置を駆動する駆動装置とを設け、前記BF3比例
計数管の校正時には前記校正装置の熱中性子吸収
体がホツパー側で前記校正板がBF3比例計数管側
になるように前記校正装置を前記ホツパとBF3比
例計数管の間に挿入し、前記被測定物から減速散
乱する熱中性子を前記熱中性子吸収体で吸収し、
前記校正板から減速散乱する熱中性子を前記BF3
比例計数管で計数するよう にしたことを特徴とする中性子水分計。[Claims for Utility Model Registration] Fast neutrons are irradiated from a fast neutron source to an object to be measured contained in a hopper, and thermal neutrons that are decelerated and scattered by moisture in the object to be measured are counted by a BF 3 proportional counter tube. A neutron moisture meter is provided with a calibration device that integrates a calibration plate and a thermal neutron absorber that decelerate and scatter thermal neutrons equivalent to a certain known moisture content, and a drive device that drives the calibration device, and performs the BF 3 proportional counter. When calibrating the tube, insert the calibration device between the hopper and the BF 3 proportional counter tube so that the thermal neutron absorber of the calibration device is on the hopper side and the calibration plate is on the BF 3 proportional counter tube side. Thermal neutrons decelerated and scattered from the measurement object are absorbed by the thermal neutron absorber,
Thermal neutrons decelerated and scattered from the calibration plate are transferred to the BF 3
A neutron moisture meter characterized by counting using a proportional counter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18793181U JPS5892654U (en) | 1981-12-18 | 1981-12-18 | neutron moisture meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18793181U JPS5892654U (en) | 1981-12-18 | 1981-12-18 | neutron moisture meter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5892654U JPS5892654U (en) | 1983-06-23 |
| JPH0318914Y2 true JPH0318914Y2 (en) | 1991-04-22 |
Family
ID=29991136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18793181U Granted JPS5892654U (en) | 1981-12-18 | 1981-12-18 | neutron moisture meter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5892654U (en) |
-
1981
- 1981-12-18 JP JP18793181U patent/JPS5892654U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5892654U (en) | 1983-06-23 |
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