JPH0616107B2 - Liquid scintillation counter - Google Patents
Liquid scintillation counterInfo
- Publication number
- JPH0616107B2 JPH0616107B2 JP19798686A JP19798686A JPH0616107B2 JP H0616107 B2 JPH0616107 B2 JP H0616107B2 JP 19798686 A JP19798686 A JP 19798686A JP 19798686 A JP19798686 A JP 19798686A JP H0616107 B2 JPH0616107 B2 JP H0616107B2
- Authority
- JP
- Japan
- Prior art keywords
- counting
- systems
- circuit
- chemiluminescence
- simultaneous
- 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 - Fee Related
Links
- 239000007788 liquid Substances 0.000 title claims description 10
- 229910052796 boron Inorganic materials 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 238000000354 decomposition reaction Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 description 16
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 description 10
- 238000005567 liquid scintillation counting Methods 0.000 description 8
- 230000005855 radiation Effects 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- YZCKVEUIGOORGS-NJFSPNSNSA-N Tritium Chemical compound [3H] YZCKVEUIGOORGS-NJFSPNSNSA-N 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000004020 luminiscence type Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XREXPQGDOPQPAH-QKUPJAQQSA-K trisodium;[(z)-18-[1,3-bis[[(z)-12-sulfonatooxyoctadec-9-enoyl]oxy]propan-2-yloxy]-18-oxooctadec-9-en-7-yl] sulfate Chemical compound [Na+].[Na+].[Na+].CCCCCCC(OS([O-])(=O)=O)C\C=C/CCCCCCCC(=O)OCC(OC(=O)CCCCCCC\C=C/CC(CCCCCC)OS([O-])(=O)=O)COC(=O)CCCCCCC\C=C/CC(CCCCCC)OS([O-])(=O)=O XREXPQGDOPQPAH-QKUPJAQQSA-K 0.000 description 2
- 229910052722 tritium Inorganic materials 0.000 description 2
- YZCKVEUIGOORGS-IGMARMGPSA-N Protium Chemical compound [1H] YZCKVEUIGOORGS-IGMARMGPSA-N 0.000 description 1
- XLYOFNOQVPJJNP-PWCQTSIFSA-N Tritiated water Chemical compound [3H]O[3H] XLYOFNOQVPJJNP-PWCQTSIFSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000005250 beta ray Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- QOSATHPSBFQAML-UHFFFAOYSA-N hydrogen peroxide;hydrate Chemical compound O.OO QOSATHPSBFQAML-UHFFFAOYSA-N 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 210000003813 thumb Anatomy 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Measurement Of Radiation (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は液体シンチレーション計数装置に関する。詳し
くは、本発明は、光電子増倍管の配置と電気回路に工夫
をこらすことにより、主として低エネルギーβ線放出放
射性核種・三重水素（トリチウム）の放射能測定におい
て、高効率測定と化学発光（ケミカルルミネッセンス）
除去測定ができて微量放射能を高精度測定するために利
用される液体シンチレーション計数装置に関する。TECHNICAL FIELD The present invention relates to a liquid scintillation counting device. More specifically, the present invention has been devised in the arrangement of the photomultiplier tube and the electric circuit so as to achieve high-efficiency measurement and chemiluminescence (mainly in the measurement of radioactivity of low-energy β-ray emitting radionuclide, tritium). Chemical luminescence)
The present invention relates to a liquid scintillation counting device which can be used for removal measurement and used for highly accurate measurement of trace radioactivity.
（従来の技術） 従来の液体シンチレーション計数装置においては、２本
の光電子増倍管をバイアル瓶に面するように180゜に対
向して配置し、各光電子増倍管からのタイミング信号を
２系統中２系統作動計数回路で計数する方法が採られて
来た。（参考文献：南山堂発行、石川寛昭著「液体シン
チレーション測定法」の第５章「計数装置の機構」） （発明が解決しようとする問題点） 本発明は次の３点を解決せんとするものである。(Prior Art) In a conventional liquid scintillation counter, two photomultiplier tubes are arranged facing each other at 180 ° so as to face a vial, and two timing signals from each photomultiplier tube are provided. The method of counting with the middle two-system operation counting circuit has been adopted. (Reference: Chapter 5 "Mechanism of counting device" in "Liquid scintillation measurement method" by Hiroshi Ishikawa, published by Nanzando) (Problems to be solved by the invention) The present invention is intended to solve the following three points. It is a thing.
(1)低効率 従来型の液体シンチレーション計数装置は三重水素（ト
リチウム）に対する計数効率が低い。(1) Low efficiency The conventional liquid scintillation counter has low counting efficiency for tritium.
（１０〜３０％） (2)化学発光（ケミカルルミネッセンス）による疑似計
数 化学発光とは液体シンチレーターと測定試料を混合した
時，化学的励起によって生じる発光のことで、アルカリ
性測定試料では、この化学発光が高頻度で長時間持続
し、誤差要因となる。(10-30%) (2) Pseudo-counting by chemiluminescence Chemiluminescence is the luminescence generated by chemical excitation when the liquid scintillator and the measurement sample are mixed. Frequently continues for a long time, which causes an error.
(3)測定モード選択の煩雑さ 化学発光のないサンプルは高効率だけ目標にした測定モ
ード、他方、化学発光のあるサンプル化学発光を除去す
る測定モードと言うように、サンプルの性質に応じて測
定モードを選ぶ必要がある。(3) Complexity of measurement mode selection A sample with no chemiluminescence is a measurement mode that targets only high efficiency, while a sample with chemiluminescence is a measurement mode that removes chemiluminescence. You need to choose a mode.
（問題点を解決するための手段） (1)効率について 本発明において、３本の光電子増倍管をバイアル瓶に面
するように配置し、２本を用いる従来型装置よりバイア
ル瓶を見込む立体角を大きくするとともに、３系統中２
系統作動同時計数回路を使用することによって、従来法
の２系統中２系統作動同時計数回路で落とされる事象も
観測でき、これにより従来型よりも高効率が得られる。
ここに、３系統中２系統差堂堂時計数回路とは、三つの
信号入力部（A,B,C）を有し、そのうちの少なくとも二
つの信号入力部（ＡとＢ，ＢとＣ，ＣとＡ，ＡとＢと
Ｃ）に決められた時間幅（分解時間）内にパルス入力が
起これば、同時計数信号パルスが出力するものである。
なおまた、２系統中２系統作動同時計数回路とは二つの
信号入力部を有し、二つの信号入力部全てにパルス入力
が分解時間内に起きれば同時計数信号パルスを出力する
ものである。これらにおける電気回路ほ既存の電子技術
で製作可能で、NIMモジュールとして市販されている。(Means for Solving Problems) (1) Regarding Efficiency In the present invention, three photomultiplier tubes are arranged so as to face the vial, and a three-dimensional view of the vial from a conventional apparatus using two photomultiplier tubes. 2 out of 3 lines with increasing angle
By using the system operation coincidence counting circuit, it is possible to observe the events dropped by the two systems operation coincidence counting circuit out of the two systems of the conventional method, and thus, higher efficiency than the conventional type can be obtained.
Here, the two-system Sandodo clock number circuit among three systems has three signal input sections (A, B, C), and at least two signal input sections (A and B, B and C, C) among them. And A, A, B and C), if a pulse input occurs within a time width (decomposition time) determined by A, A, B and C), a coincidence counting signal pulse is output.
In addition, the two-system operation simultaneous counting circuit of the two systems has two signal input sections, and outputs a simultaneous counting signal pulse if pulse input to all two signal input sections occurs within the decomposition time. The electric circuits in these can be manufactured using existing electronic technology, and are commercially available as NIM modules.
(2)化学発光による疑似計数について 化学発光は単一光子の偶発放出現象であるので、３個の
光電子増倍管へ同時に化学発光の光子が入射する確立
は、２個の光電子増倍管へ同時に入射する確立に比べて
格段に小さい。そこで、本発明においては、従来法より
光電子増倍管を増やして３本とし、３系統中３系統作動
同時計数回路を用いることにより化学発光除去測定がで
きるようにした。なお、放射線発光は複数個の光子が同
時に全方向に放出されるので、本発明の装置でも計数す
ることができ、実用的効率が得られる。(2) Pseudo-counting by chemiluminescence Since chemiluminescence is an accidental emission phenomenon of a single photon, establishment of simultaneous injection of chemiluminescence photons into three photomultiplier tubes is established in two photomultiplier tubes. It is much smaller than the probability of simultaneous incidence. Therefore, in the present invention, the number of photomultiplier tubes is increased from that of the conventional method, and the number of photomultiplier tubes is increased to three so that the chemiluminescence elimination measurement can be performed by using a three-system operation coincidence counting circuit. Since a plurality of photons are simultaneously emitted in all directions in radiation emission, the device of the present invention can be used for counting and practical efficiency can be obtained.
(3)測定モード選択の煩雑さについて 前項(1)及び(2)において注意すべきことは、高効率化と
化学発光除去測定が同時に行い得ないことである。すな
わち、前項(1)において示された手段は化学発光に関し
ては改善策にはならないし、また前項(2)においては示
された手段は効率の改善策とはならない。従って、サン
プルの性質に応じて、化学発光のないものは前項(1)の
手段で、化学発光のあるものは前項(2)の手段と言うよ
うに測定手法を適宜選択する必要がある。(3) Complexity of measurement mode selection It is important to note in the previous sections (1) and (2) that high efficiency and chemiluminescence elimination measurement cannot be performed simultaneously. That is, the means shown in the preceding paragraph (1) does not become an improvement measure for chemiluminescence, and the means shown in the preceding paragraph (2) does not become an improvement measure for efficiency. Therefore, depending on the properties of the sample, it is necessary to appropriately select the measurement method such as the method described in (1) above for those that do not emit chemiluminescence and the method described in (2) above for those that emit chemiluminescence.
本発明においては、３本の光電子増倍管が、どの場合で
も、共用できることに着目し、１台の液体シンチレーシ
ョン計数装置に３本の光電子増倍管、３系統中２系統作
動同時計数回路及び３系統中３系統作動同時計数回路を
具備させることによって、１台で２種の機能を備えた液
体シンチレーション計数装置を立接することができた。In the present invention, paying attention to the fact that three photomultiplier tubes can be shared in any case, one photomultiplier tube for one liquid scintillation counting device, three simultaneous photomultipliers in three systems, and a simultaneous counting circuit for two systems. By providing the three-system operation simultaneous counting circuit among the three systems, one liquid scintillation counting device having two kinds of functions could be erected.
本発明の液体シンチレーション計数装置は、３本の光電
子増倍管を共用し、１台の装置で、化学発光のないサン
プルに対しては、３系統中２系統作動同時計数回路で高
効率測定が、また化学発光のあるサンプリングに対して
は、３系統中２系統作動同時計数回路で化学発光除去測
定が極めて簡便に行うことができる。The liquid scintillation counting device of the present invention shares three photomultiplier tubes, and one device can perform high-efficiency measurement with a simultaneous counting circuit for two systems out of three systems for samples without chemiluminescence. Further, for sampling with chemiluminescence, the chemiluminescence removal measurement can be performed very easily by a simultaneous counting circuit for two systems out of three systems.
（実施例） 本発明の液体シンチレーション計数装置の作用効果を検
証するために、実施例１（第１図）及び実施例２（第２
図）で示される本発明の２形式の液体シンチレーション
計数装置を市販の従来型の装置と比較実験を行った。(Example) In order to verify the operation effect of the liquid scintillation counting device of the present invention, Example 1 (Fig. 1) and Example 2 (second).
The two types of liquid scintillation counting device of the present invention shown in the figure) were compared with a commercially available conventional device.
１）実験装置概要 実施例１、実施例２とも、100mlバイアル３を測定対象
とし、内径50mmφの反射筒２（内面に反射材として酸化
マグネシウム粉を塗布した）に光電子増倍管結合用貫通
孔を設けた口径46mmφの石英窓光電子増倍管１をバイア
ル瓶３に面するように水平に120゜間隔で３本配置し
た。1) Outline of experimental apparatus In both Example 1 and Example 2, a 100 ml vial 3 was used as a measurement target, and a reflecting tube 2 having an inner diameter of 50 mmφ (magnesium oxide powder coated as a reflecting material on the inner surface) was formed in a through hole for coupling a photomultiplier tube. Three quartz window photomultipliers 1 each having a diameter of 46 mm were provided horizontally facing the vial 3 at 120 ° intervals.
実施例 １ 光電子増倍管１からの出力をプリアンプ（図では省略）
で増幅後、コンスタントフラクションディスクリシネー
ター回路（図では省略）でパルス巾を15ナノ秒に成形し
たタイミング信号４を、３系統中２系統作動同時計数回
路１１と３系統中３系統作動同時計数回路１２の動作選
択が切替スイッチ１４によって行える同時計数回路１３
に導いた。一方、スペクトル分析（波高分析）を行うた
め、各光電子増倍管１からの波形（リニア）信号５をサ
ムアンプで加え、リニアアンプ（図では省略）で増幅
後、リニアゲート回路７のリニア信号入力部９に入力し
た。同時計数回路１３からの出力信号をタイミング調整
用ゲートアンドディレー回路（図では省略）を介してリ
ニアゲート回路７のゲート信号入力部８に入力し、それ
と同調した放射線信号のみを多重波高分析器（マルチチ
ャンネンルアナライザー）１０に入力した。Example 1 The output from the photomultiplier tube 1 is a preamplifier (not shown in the figure)
After being amplified by, the timing signal 4 whose pulse width is shaped to 15 nanoseconds by a constant fraction discriminator circuit (not shown) is used to count 2 lines in 3 systems and 3 lines in 3 systems. Simultaneous counting circuit 13 in which 12 operation selections can be performed by the changeover switch 14
Led to. On the other hand, in order to perform spectrum analysis (wave height analysis), a waveform (linear) signal 5 from each photomultiplier tube 1 is added by a thumb amplifier, amplified by a linear amplifier (not shown), and then input to a linear signal of a linear gate circuit 7. Input to Part 9. The output signal from the coincidence counting circuit 13 is input to the gate signal input section 8 of the linear gate circuit 7 via a timing adjustment gate and delay circuit (not shown), and only the radiation signal synchronized with it is input to the multiple wave height analyzer ( Multi-channel analyzer) 10.
実施例 ２ ３系統中２系統作動同時計数回路１１と３系統中３系統
作動同時計数回路１２を同時に作動させるために、分岐
回路１３でタイミング信号４を分岐して両回路１１、１
２に入力した。その他の回路系は実施例１と同じであ
る。Example 2 In order to simultaneously operate the two-system operating simultaneous counting circuit 11 of the three systems and the three-system operating simultaneous counting circuit 12 of the three systems, the timing signal 4 is branched by the branching circuit 13 to both circuits 11, 1.
Typed in 2. The other circuit system is the same as that of the first embodiment.
２）実験及び結果 (1)効率の比較 バイアル瓶に市販の液体シンチレーター（アクアゾルI
I）100ml、標準トリチウム水1ml及び微量の四塩化炭素
を加えた試料７本を作った。この際、四塩化炭素の量を
増減し、それぞれに効率の異なる液体シンチレーション
サンプルとした。これらのサンプルを用いて、従来型と
の比較を行った。結果は第３図に示す。2) Experiments and results (1) Comparison of efficiency Commercially available liquid scintillator (Aquasol I
I) Seven samples were prepared by adding 100 ml, standard tritiated water 1 ml and a trace amount of carbon tetrachloride. At this time, the amount of carbon tetrachloride was increased or decreased to obtain liquid scintillation samples with different efficiencies. These samples were used for comparison with the conventional type. Results are shown in FIG.
第３図において、横軸は四塩化炭素の量に関係する外部
標準線源比、縦軸は効率である。In FIG. 3, the horizontal axis represents the external standard radiation source ratio related to the amount of carbon tetrachloride, and the vertical axis represents the efficiency.
この結果より、例えば外部標準線源比が最小のサンプル
（四塩化炭素含有量が最大のもの）の効率は、従来型で
は１０％で、本発明では１５％と１．５倍に改善され、
また、外部標準線源比が最大のサンプル（四塩化炭素含
有量が最小のもの）でも、効率は、従来型では３５％、
本発明では４６％と１．３倍に改善されており、本発明
が、効率の点において、従来型より優れていることが実
証された。From this result, for example, the efficiency of the sample with the minimum external standard source ratio (the one with the highest carbon tetrachloride content) is 10% in the conventional type, and is 15% in the present invention, which is 1.5 times higher.
Even for the sample with the highest external standard source ratio (with the lowest carbon tetrachloride content), the efficiency is 35% for the conventional type,
In the present invention, the improvement is 46%, which is 1.3 times, which proves that the present invention is superior to the conventional type in terms of efficiency.
なお、実施例１と実施例２の効率には、優劣は見られな
かった。The efficiency of Examples 1 and 2 was not superior or inferior.
(2)化学発光除去性能の比較 市販の液体シンチレーター（アクアゾルII）、過酸化水
素水1ml、水酸化ナトリウム20％水1mlをバイアル瓶にて
混合し、放射能を含有しない化学発光サンプルを調整し
た。この化学発光サンプルを市販の従来型装置と本実施
例の装置で測定した。結果を第４図に示す。(2) Comparison of chemiluminescence removal performance A commercially available liquid scintillator (Aquasol II), 1 ml of hydrogen peroxide water, and 1 ml of 20% sodium hydroxide water were mixed in a vial to prepare a chemiluminescence sample containing no radioactivity. . This chemiluminescent sample was measured with a commercially available conventional device and the device of this example. Results are shown in FIG.
第４図において、横軸はサンプル調整後の経過時間、縦
軸は化学発光計数率である。In FIG. 4, the horizontal axis is the elapsed time after sample preparation, and the vertical axis is the chemiluminescence counting rate.
サンプル調整５分後における化学発光計数率が従来型で
は2000cpm（counts per minute、毎分当りのカウント
数）以上であるのに対して、本発明の装置では０cpmで
あった。この結果から本発明の装置は、化学発光除去性
能の点において従来型よりも格段に優れていることが判
明した。The chemiluminescence count rate after 5 minutes of sample preparation was 2000 cpm (counts per minute, counts per minute) or more in the conventional type, whereas it was 0 cpm in the apparatus of the present invention. From this result, it was found that the device of the present invention is significantly superior to the conventional device in terms of chemiluminescence removal performance.
なお、実施例１と実施例２の化学発光除去性能には、優
劣は見られなかった。No superiority or inferiority was observed in the chemiluminescence removal performance of Examples 1 and 2.
(3)測定モード選択の煩雑さ 実施例１、実施例２とも、化学発光のあるサンプルも、
化学発光のないサンプルも一台の装置で計数できるの
で、測定モード選択の煩雑さはなかった。実施例２では
回路選択スイッチ切替えの手間が省け、より便利であっ
た。(3) Complexity of measurement mode selection In both Example 1 and Example 2, chemiluminescent samples were
Samples without chemiluminescence can be counted with one device, so there was no complexity in selecting the measurement mode. In the second embodiment, it is more convenient because the trouble of switching the circuit selection switch is saved.
第１図は、本発明の液体シンチレーション計数装置の一
具体例（実施例１）の構造回路図である。 図において、 １……光電子増倍管、２……反射筒 ３……バイアル瓶、４……タイミング信号 ５……波形（リニア信号）、６……サムアンプ ７……リニアゲート回路 ８……ゲート信号入力部 ９……リニア信号入力部 １０……多重波高分析器（マルチチャンネルアナライザ
ー） １１……３系統中２系統作動同時計数回路 １２……３系統中３系統作動同時計数回路 １３……同時計数回路 １４……切替スイッチ 第２図は、本発明の液体シンチレーション計数装置の他
の具体例（実施例２）の構造回路図である。 図において、 １……光電子増倍管、２……反射筒 ３……バイアル瓶、４……タイミング信号 ５……波形（リニア信号）、６……サムアンプ ７……リニアゲート回路 ８……ゲート信号入力部 ９……リニア信号入力部 １０……多重波高分析器（マルチチャンネルアナライザ
ー） １１……３系統中２系統作動同時計数回路 １２……３系統中３系統作動同時計数回路 １３……分岐回路 第３図は、従来型と本発明の装置の効率を比較した実験
結果を示すグラフである。 図において、 横軸は外部標準線源比、縦軸は効率で、線１は従来型、
線２は本発明の装置の結果を示す。 第４図は、従来型と本発明の装置の化学発光除去性能を
比較した実験結果を示すグラフである。 図において、 横軸は経過時間（分）、縦軸は化学発光計数率で、線１
は従来型、線２は本発明の装置の結果を示す。FIG. 1 is a structural circuit diagram of a specific example (Example 1) of the liquid scintillation counter of the present invention. In the figure, 1 ... Photomultiplier tube, 2 ... Reflector tube, 3 ... Vial bottle, 4 ... Timing signal, 5 ... Waveform (linear signal), 6 ... Sum amplifier, 7 ... Linear gate circuit, 8 ... Gate Signal input section 9 …… Linear signal input section 10 …… Multiple wave height analyzer (multi-channel analyzer) 11 …… 2 systems out of 3 systems simultaneous counting circuit 12 …… 3 systems out of 3 systems simultaneous counting circuit 13 …… Simultaneous Counting circuit 14 ... Changeover switch Fig. 2 is a structural circuit diagram of another specific example (Example 2) of the liquid scintillation counting apparatus of the present invention. In the figure, 1 ... Photomultiplier tube, 2 ... Reflector tube, 3 ... Vial bottle, 4 ... Timing signal, 5 ... Waveform (linear signal), 6 ... Sum amplifier, 7 ... Linear gate circuit, 8 ... Gate Signal input section 9 …… Linear signal input section 10 …… Multiple wave height analyzer (multi-channel analyzer) 11 …… 2 systems out of 3 systems simultaneous counting circuit 12 …… 3 systems out of 3 systems simultaneous counting circuit 13 …… Branch Circuit FIG. 3 is a graph showing experimental results comparing the efficiency of the conventional device and the device of the present invention. In the figure, the horizontal axis is the external standard radiation source ratio, the vertical axis is the efficiency, line 1 is the conventional type,
Line 2 shows the result of the device of the invention. FIG. 4 is a graph showing the experimental results comparing the chemiluminescence removal performances of the conventional type and the device of the present invention. In the figure, the horizontal axis is elapsed time (minutes), and the vertical axis is chemiluminescence count rate.
Shows the result of the conventional device, and line 2 shows the result of the device of the present invention.
フロントページの続き (72)発明者 御座 精二 東京都福生市熊川1642番地26 応用光研工 業株式会社内Front page continuation (72) Inventor Seiji Goza 1642, Kumakawa, Fussa, Tokyo 26
Claims (1)
の光電子増倍管（ａ）、各光電子増倍管の三つのタイミ
ング信号を同時計数するための３系統中２系統作動同時
計数回路（ｂ）及び各光電子増倍管の三つのタイミング
信号を同時計数するための３系統中３系統作動同時計数
回路（ｃ）から成る液体シンチレーション計数装置（こ
こに、３系統中２系統作動同時計数回路とは、三つの信
号入力部（Ａ，Ｂ，Ｃ）を有し、そのうちの少なくとも
二つの信号入力部（ＡとＢ，ＢとＣ，ＣとＡ，ＡとＢと
Ｃ）に決められた時間幅（分解時間）内にパルス入力が
起これば、同時計数信号パルスが出力するものであり、
３系統中３系統作動同時計数回路とは、三つの信号入力
部を有し、三つの信号入力部全てにパルス入力が分解時
間内に起きれば、同時計数信号パルスが出力するもので
ある。1. Three photomultiplier tubes (a) arranged so as to face a vial, and two-system operation simultaneous counting among three systems for simultaneously counting three timing signals of each photomultiplier tube. A liquid scintillation counter comprising three (3) system simultaneous coincidence counting circuits (c) for simultaneously counting three timing signals of the circuit (b) and each photomultiplier (here, two of three systems are simultaneously operated). The counting circuit has three signal input sections (A, B, C), and at least two of the signal input sections (A and B, B and C, C and A, A and B and C) are determined. If a pulse input occurs within the specified time width (decomposition time), a coincidence counting signal pulse is output,
The three-system operation simultaneous counting circuit out of three systems has three signal input sections, and outputs a simultaneous counting signal pulse when pulse input to all three signal input sections occurs within the decomposition time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19798686A JPH0616107B2 (en) | 1986-08-26 | 1986-08-26 | Liquid scintillation counter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19798686A JPH0616107B2 (en) | 1986-08-26 | 1986-08-26 | Liquid scintillation counter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6355485A JPS6355485A (en) | 1988-03-09 |
| JPH0616107B2 true JPH0616107B2 (en) | 1994-03-02 |
Family
ID=16383609
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19798686A Expired - Fee Related JPH0616107B2 (en) | 1986-08-26 | 1986-08-26 | Liquid scintillation counter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0616107B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005108623A (en) | 2003-09-30 | 2005-04-21 | Jst Mfg Co Ltd | High-speed transmission connector |
| JP4659612B2 (en) * | 2005-12-28 | 2011-03-30 | 三菱電機株式会社 | Water monitor |
| JP4933484B2 (en) * | 2008-05-19 | 2012-05-16 | 日立アロカメディカル株式会社 | Liquid scintillation counter |
| JP5736566B2 (en) * | 2010-08-25 | 2015-06-17 | 国立研究開発法人産業技術総合研究所 | Radioactivity absolute measurement method by liquid scintillation and calibration method of radioactivity measurement device |
| CN107894606B (en) * | 2017-11-20 | 2019-07-02 | 浙江大学 | Carbon-14 test bottle, test device and method, sampling system and calculation method |
-
1986
- 1986-08-26 JP JP19798686A patent/JPH0616107B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6355485A (en) | 1988-03-09 |
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