CN103675884B - A kind of method for judging that in G-M counter tube nuclear radiation detector, G-M counter tube is saturated - Google Patents
A kind of method for judging that in G-M counter tube nuclear radiation detector, G-M counter tube is saturated Download PDFInfo
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- CN103675884B CN103675884B CN201310668786.XA CN201310668786A CN103675884B CN 103675884 B CN103675884 B CN 103675884B CN 201310668786 A CN201310668786 A CN 201310668786A CN 103675884 B CN103675884 B CN 103675884B
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- 230000005855 radiation Effects 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 25
- 229920006395 saturated elastomer Polymers 0.000 title claims abstract description 23
- 230000010354 integration Effects 0.000 claims abstract description 24
- 238000002955 isolation Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N ferric oxide Chemical compound O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 239000003758 nuclear fuel Substances 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
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Abstract
The present invention relates to nuclear radiation monitoring field, a kind of method for judging that in G-M counter tube nuclear radiation detector, G-M counter tube is saturated is provided, the method adds integrating function after the cloudy pulse of counter tube exports, integration module exports as DC voltage, the follow-up processing of circuit display of direct current force feed, the output voltage V that record G-M counter tube is prescribed a time limit on it is measured
t, using it as judging the basis for estimation whether G-M counter tube is saturated, with the integration module output voltage V measured
dwith voltage V
trelatively, judge that whether counter tube is saturated, when output voltage is greater than voltage V
ttime, G-M counter tube is operated in state of saturation; When output voltage is less than voltage V
ttime, G-M counter tube is operated in normal condition.The inventive method effectively can avoid the erroneous judgement to radiation field measurement value.
Description
Technical field
The present invention relates to nuclear radiation monitoring field, specifically a kind of method for judging that in G-M counter tube nuclear radiation detector, G-M counter tube is saturated.
Background technology
It is large that G-M counter tube has amplitude output signal, the advantage such as low in energy consumption, suitable environment temperature range is wide, volume is little, simple and reliable for structure, cost is low, the life-span is long, is widely used in nuclear radiation monitoring fields such as nuclear fuel processing, reactor, accelerator, nuclear power station, environs radiation monitorings.
Use G-M counter tube as nuclear radiation detector, its signal acquisition circuit usually as shown in Figure 1, 2.The principle of work of this circuit is as follows: nuclear radiation ray enters in G-M counter tube sensitive volume, gas in sensitive volume is ionized, the electronics produced accelerates anode and drifts about and produce multiplied electron under accelerating field effect, near anodic wire, there is electron avalanche, thus produce pulse current between G-M counter tube negative and positive the two poles of the earth.Pulse current flows through resistance R2, produces potential pulse, send subsequent processes circuit through electric capacity C1 after straight process.General subsequent processes circuit comprises the processing capacity modules such as pulse examination, shaping, counting and counting rate-dose rate conversion.
The shortcoming of above circuit is, along with the increase of dose rate, the ray entered in unit interval in G-M counter tube sensitive volume increases, the pulse that the positive ion sheath produced around counter tube anodic wire produces when not disappearing completely increases, counter tube progresses into state of saturation, output pulse amplitude is more and more less, and wherein partial pulse amplitude drops to below follow-up discriminator circuit threshold value, and the umber of pulse causing secondary instrument to be recorded to is more and more less.Even after dose rate reaches certain magnitude, the counting rate of subsequent processes circuit record is on the contrary than little during LDR.This may cause the measured value of instrument reflexed when range is high-end, makes user produce erroneous judgement, causes Nuclear Accidents.
Summary of the invention
The present invention is exactly for the weak point in above-mentioned background technology, and provides a kind of method for judging that in G-M counter tube nuclear radiation detector, G-M counter tube is saturated, effectively can avoid the erroneous judgement to radiation field measurement value.
The object of the invention is to be achieved by the following technical measures.
For the method judging that in G-M counter tube nuclear radiation detector, G-M counter tube is saturated, the method comprises the following steps:
(1) after the pulse of G-M counter tube exports, arrange integration module and carry out integration to the output of G-M counter tube, integration module exports as DC voltage V
d;
(2) nuclear radiation detector is placed in Standard Ratio to calibrate after the match, the output voltage V that record G-M counter tube is prescribed a time limit on it is measured
t, using it as judging the basis for estimation whether G-M counter tube is saturated;
(3) with the integration module output voltage V that Real-time Collection arrives
dwith voltage V
trelatively, judge that whether counter tube is saturated, as output voltage V
dbe greater than voltage V
ttime, G-M counter tube is operated in state of saturation, as output voltage V
dbe less than voltage V
ttime, G-M counter tube is operated in normal condition.
In technique scheme, the integration module described in step (1), according to the difference of counter tube signal acquisition circuit and subsequent processes circuit, is selected to adopt passive integration or active integrating circuit.
A kind of method for judging that in G-M counter tube nuclear radiation detector, G-M counter tube is saturated provided by the invention, accurately can judge that whether G-M counter tube is saturated, avoid exceeding in measurement the measured value problem that may cause Nuclear Accidents less than normal in limited time because G-M counts tubular type instrument in dose rate.
Accompanying drawing explanation
Fig. 1 G-M counts cast nuclear radiation detector signal acquisition circuit schematic diagram one.
Fig. 2 G-M counts cast nuclear radiation detector signal acquisition circuit schematic diagram two.
The embodiment one of integration module in Fig. 3 the present invention.
The embodiment two of integration module in Fig. 4 the present invention.
Output voltage V in Fig. 5 the present invention
dwith the changing trend diagram that dose rate increases.
Wherein: R1 is anode resistance, R2, R3 are sample resistance, and C1 is capacitance, and C2 is integrating capacitor, V
pfor exporting pulse, V
dfor integration module exports DC voltage, V
tfor integration module is in the output DC voltage of G-M counter tube under nuclear radiation radionetric survey upper dosage limit rate, A1 is amplifier.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The invention provides a kind of for judging the method whether G-M counter tube is saturated.The method adds integrating function after counter tube pulse exports, and integration module exports as DC voltage, the follow-up processing of circuit display of direct current force feed.Its principle as shown in Figure 3,4.
As shown in Figure 3,4, be two kinds of embodiments of the present invention.Wherein, Fig. 3 is that G-M counter tube is operated in negative electrode sampling mode and judges the circuit theory diagrams whether G-M counter tube is saturated; Fig. 4 be G-M counter tube be operated in anode sampling judge the circuit theory diagrams whether counter tube saturated; Integration module is made up of R3 resistance and C2 electric capacity, and integration time constant should be 3 times to 5 times or larger of counter dead time; A1 amplifier plays isolation and buffer action.As shown in Figure 3, G-M counter tube negative electrode is connected with amplifier A1 input end, and amplifier A1 output terminal is ground connection after resistance R3 and electric capacity C2 parallel circuit.As shown in Figure 4, G-M counter tube negative electrode is connected with amplifier A1 input end, and G-M counter tube negative electrode is ground connection after resistance R3 and electric capacity C2 parallel circuit.
By utilizing Fig. 3, the nuclear radiation detector of 4 principle designs is connected with secondary instrument, and secondary instrument should be able to record and process and export pulse V
pwith output voltage V
d.The DC voltage V that integrating circuit exports
dvariation tendency as shown in Figure 5.When dose rate is measured in limited time upper close to G-M counter tube, the change of integrating circuit output level slowly; After dose rate measures the upper limit more than G-M counter tube, the change of integrating circuit output level is very little.
Nuclear radiation detector is placed in Standard Ratio calibrate after the match.The output voltage V that record G-M counter tube is prescribed a time limit on it is measured
t, using it as judging the basis for estimation whether G-M counter tube is saturated.With the integration module output voltage V measured
dwith voltage V
trelatively, judge that whether counter tube is saturated.When output voltage is greater than voltage V
ttime, G-M counter tube is operated in state of saturation; When output voltage is less than voltage V
ttime, G-M counter tube is operated in normal condition.
Claims (4)
1. the method for judging that in G-M counter tube nuclear radiation detector, G-M counter tube is saturated, is characterized in that the method comprises the following steps:
(1) after the pulse of G-M counter tube exports, arrange integration module and carry out integration to the output of G-M counter tube, integration module exports as DC voltage V
d;
(2) nuclear radiation detector is placed in Standard Ratio to calibrate after the match, the output voltage V that record G-M counter tube is prescribed a time limit on it is measured
t, using it as judging the basis for estimation whether G-M counter tube is saturated;
(3) with the integration module output voltage V that Real-time Collection arrives
dwith voltage V
trelatively, judge that whether counter tube is saturated, as output voltage V
dbe greater than voltage V
ttime, G-M counter tube is operated in state of saturation, as output voltage V
dbe less than voltage V
ttime, G-M counter tube is operated in normal condition.
2. the method for judging that in G-M counter tube nuclear radiation detector, G-M counter tube is saturated according to claim 1, it is characterized in that: the integration module described in step (1), according to the difference of counter tube signal acquisition circuit and subsequent processes circuit, is selected to adopt passive integration or active integrating circuit.
3. the method for judging that in G-M counter tube nuclear radiation detector, G-M counter tube is saturated according to claim 1, is characterized in that: the integration module described in step (1) is composed in parallel by resistance R3 and electric capacity C2, and amplifier A1 plays isolation and buffer action; G-M counter tube negative electrode is connected with amplifier A1 input end, and amplifier A1 output terminal is ground connection after resistance R3 and electric capacity C2 parallel circuit.
4. the method for judging that in G-M counter tube nuclear radiation detector, G-M counter tube is saturated according to claim 1, is characterized in that: the integration module described in step (1) is composed in parallel by resistance R3 and electric capacity C2, and amplifier A1 plays isolation and buffer action; G-M counter tube negative electrode is connected with amplifier A1 input end, and G-M counter tube negative electrode is ground connection after resistance R3 and electric capacity C2 parallel circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310668786.XA CN103675884B (en) | 2013-12-11 | 2013-12-11 | A kind of method for judging that in G-M counter tube nuclear radiation detector, G-M counter tube is saturated |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310668786.XA CN103675884B (en) | 2013-12-11 | 2013-12-11 | A kind of method for judging that in G-M counter tube nuclear radiation detector, G-M counter tube is saturated |
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| Publication Number | Publication Date |
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| CN103675884A CN103675884A (en) | 2014-03-26 |
| CN103675884B true CN103675884B (en) | 2015-11-18 |
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| CN104360372B (en) * | 2014-11-05 | 2017-02-15 | 武汉海王核能装备工程有限公司 | Dual-connector output counter tube and operating method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4260892A (en) * | 1979-08-22 | 1981-04-07 | Bell Telephone Laboratories, Incorporated | Geiger-Mueller radiation detector with means for detecting and indicating the existence of radiation overload |
| US4311909A (en) * | 1980-07-23 | 1982-01-19 | Victoreen Incorporated | Geiger-Mueller tube coincidence loss correction circuit |
| JP3242865B2 (en) * | 1997-07-09 | 2001-12-25 | アロカ株式会社 | Radiation detector |
| CN103083029A (en) * | 2011-11-01 | 2013-05-08 | 三星电子株式会社 | Photon Counting Detector, And Photon Counting And Detecting Method Using The Same |
-
2013
- 2013-12-11 CN CN201310668786.XA patent/CN103675884B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4260892A (en) * | 1979-08-22 | 1981-04-07 | Bell Telephone Laboratories, Incorporated | Geiger-Mueller radiation detector with means for detecting and indicating the existence of radiation overload |
| US4311909A (en) * | 1980-07-23 | 1982-01-19 | Victoreen Incorporated | Geiger-Mueller tube coincidence loss correction circuit |
| JP3242865B2 (en) * | 1997-07-09 | 2001-12-25 | アロカ株式会社 | Radiation detector |
| CN103083029A (en) * | 2011-11-01 | 2013-05-08 | 三星电子株式会社 | Photon Counting Detector, And Photon Counting And Detecting Method Using The Same |
Non-Patent Citations (4)
| Title |
|---|
| A simplified technique to determine random coincidence summing of gamma rays and dead time count loss corrections;R. Shweikani et al;《Applied Radiation and Isotopes》;20130807;第82卷;第72-74页 * |
| G-M 计数管用作辐射剂量测量应解决的问题;王国荣等;《核电子学与探测技术》;20110930;第31卷(第9期);第1014-1017页 * |
| GM计数管死时间及其对辐射G测量的影响;刘国才;《核电子学与探测技术》;19900331;第10卷(第2期);第92-96页 * |
| 可控制脉冲供电针数管(l);唐孝威;《物理学报》;19610630;第17卷(第6期);第273-285页 * |
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