CN209946400U - double-GM tube radiation detector with range span reaching 9 orders of magnitude - Google Patents
double-GM tube radiation detector with range span reaching 9 orders of magnitude Download PDFInfo
- Publication number
- CN209946400U CN209946400U CN201920404948.1U CN201920404948U CN209946400U CN 209946400 U CN209946400 U CN 209946400U CN 201920404948 U CN201920404948 U CN 201920404948U CN 209946400 U CN209946400 U CN 209946400U
- Authority
- CN
- China
- Prior art keywords
- tube
- range
- switching tube
- resistor
- gml
- 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
Images
Landscapes
- Measurement Of Radiation (AREA)
Abstract
The utility model discloses a range span reaches two GM pipe radiation detector of 9 orders of magnitude, including high-range GM pipe GMH, low-range GM pipe GML, switch tube Q1, switch tube Q2, switch tube Q3, switch tube Q4, switch tube Q5, switch tube Q6, current-limiting resistance R1, bypass resistance R2, resistance R3, resistance R4, resistance R5, pulse shaping circuit; the anode of the high-range GM tube GMH and the anode of the low-range GM tube GML are connected together, the switch tube Q3 is connected in series between the cathode of the low-range GM tube GML and the pulse shaping circuit, the switch tube Q4 is connected in series between the cathode of the high-range GM tube GMH and the pulse shaping circuit, and through control signals, only one of the GM tubes GML and GMH is in a working state, and the other GM tube GML and GMH is in a dormant state at any moment. The whole detector has simple circuit, convenient control and rapid switching, and realizes an integrated radiation detector with the span of 9 orders of magnitude.
Description
Technical Field
The utility model belongs to nuclear radiation detection field especially relates to a range span reaches two GM pipe radiation detector of 9 orders of magnitude.
Background
In the nuclear radiation detection instrument, a radiation detector using a geiger-miller counter tube, abbreviated as GM tube, as a sensor was widely used in the early days. The radiation detector taking the GM tube as the core is widely applied to various nuclear radiation detection instruments and equipment due to the characteristics of simple front-end circuit, large enough output signal amplitude, good signal-to-noise ratio, strong stability, convenient maintenance, low price and the like, and particularly has the advantage of simpler circuit and structural requirements when the gamma dose rate needs to be continuously monitored on line in a high-dose place.
However, due to the inherent dead time of the GM tube being 100 microseconds, the measurement range of the GM tube detector is limited to 3 to 4 orders of magnitude, and in order to obtain a radiation detector with a wider range, a method is commonly adopted in which a dual GM tube is used, that is, two GM tubes are built in one radiation detector and are respectively used for measuring radiation doses in high and low ranges, and the range of the detector with the dual GM tube as a core is generally 7 orders of magnitude. One key point of the detector with the double GM tubes as the core is to solve the switching problem of the measuring range.
The prior art mainly switches by three ways, the first is to control the high-voltage on-off of different counting tubes by controlling the on-off of a relay connected between the cathode of a GM tube and the ground in series to realize the switching of the measuring range; the second one adopts the high-range GM tube to be in the working state all the time, the low-range GM tube enters the working state only when the dosage is low, and the control of the range is realized by a high-voltage triode which is connected between the cathode of the low-range GM and the ground in series; the third one is that a switch tube is connected between the cathode of the high and low range GM tube and the ground in series, and the range is switched by controlling the on-off of the two switch tubes.
The size of the relay is large, and when the relay is switched on and switched off, the electromagnetic radiation is large; the high-range GM pipe is always in a working state, which can affect the service life of the detector; a switching tube is connected in series between the cathode of the high-range GM tube and the ground, and the pulse signal can not be ensured to be only from a single GM tube.
In addition, the inherent dead Time of the GM tube, which is a hard injury, is better solved with the proposal of a new technology Time-To-Count measuring method, and the current domestic reported detector measuring range of a single GM tube adopting the Time-To-Count technical method can reach 5 orders of magnitude. The Time-To-Count measurement method requires that the high voltage charging of the GM tube is as fast as possible, the shorter the charging Time is, the wider the measurable range is, and the establishment process of the high voltage of the GM tube is restricted by the basic RC parameters.
The GM tube always has a certain distributed capacitance to ground, the capacitance value is generally not lower than a few pF, and the resistance value of the current limiting resistor used for discharging the GM tube is usually in megaohm, that is, the charging time constant of the GM tube is microsecond, and the charging time constant of the circuit in practical application is not lower than 10 microseconds. In some places, the variation range of the radiation dose rate is from 10nGy/h to more than 10Gy/h of the environmental background, namely the span of the range of the radiation detector needs to be more than 9 orders of magnitude, and the existing detector is difficult to meet the measurement requirement.
SUMMERY OF THE UTILITY MODEL
In order to solve the technical problem who exists among the background art, the utility model provides a range span reaches two GM pipe radiation detector of 9 orders of magnitude.
The technical scheme of the utility model as follows:
the double-GM tube radiation detector with the range span reaching 9 orders of magnitude is characterized by comprising a low-range GM tube GML, a high-range GM tube GMH and a pulse shaping circuit, wherein the anode of the low-range GM tube GML and the anode of the high-range GM tube GMH are connected with a power supply circuit;
the cathode of the low-range GM tube GML is connected with the pulse shaping circuit through a switching tube Q3, and the base electrode of a switching tube Q3 is sequentially connected with a resistor R4 and a switching tube Q5; the cathode of the high-range GM tube GMH is connected with the pulse shaping circuit through a switching tube Q4, and the base of the switching tube Q4 is sequentially connected with a resistor R5 and a switching tube Q6;
the switching tube Q5 and the switching tube Q6 respectively control the on-off of the switching tube Q3 and the switching tube Q4, and only one of the switching tube Q3 and the switching tube Q4 is in a conducting state at any moment.
The anode of the low range GM tube GML and the anode of the high range GM tube GMH are connected together.
The power supply circuit comprises a switching tube Q1, a switching tube Q2, a current limiting resistor R1, a bypass resistor R2 and a resistor R3; one end of the bypass resistor R2 and one end of the current limiting resistor R1 are connected to the anodes of the low range GM tube GML and the high range GM tube GMH, the other end of the bypass resistor R2 is connected to the collector of the switch tube Q1, the emitter of the switch tube Q1 and the other end of the current limiting resistor R1 are connected to the high voltage input end HV, the base of the switch tube Q1 is connected to one end of the resistor R3, the other end of the resistor R3 is connected to the collector of the switch tube Q2, the emitter of the switch tube Q2 is grounded, and the base of the switch tube Q2 is connected to the control signal CT 1.
The bypass resistor R2 may be connected to the switching tube Q1, and the bypass resistor R2 may be connected to the emitter of the switching tube Q1 on the left side of the switching tube Q1, i.e., at one end of the bypass resistor R2, and the collector of the switching tube Q1 is connected to the anodes of the two GM tubes GMH and GML.
In order to reduce the charging time constant of the GM tube during the high-voltage charging, after a control signal CT1 sent by the controller is obtained, Q2 is conducted, and Q1 is also conducted, so that the high-voltage HV charges the GM tube through a bypass resistor R2 with a much smaller resistance value, preferably 10K omega for R2, and the charging time constant is tens of nanoseconds, thereby meeting the requirement of quick charging.
The emitting electrode of the switching tube Q3 is connected with the cathode of the low-range GM tube GML, and the collector electrode of the switching tube Q3 is connected with the pulse shaping circuit; the emitter of the switching tube Q4 is connected with the cathode of the high-range GM tube GMH, and the collector of the switching tube Q4 is connected with the pulse shaping circuit.
The emitters of the switching tube Q5 and the switching tube Q6 are grounded, the base stage is respectively connected with control signals CT2 and CT3, and the control signals CT2 and CT3 are mutually opposite control signals. At any one time, one and only one of the switching tubes Q3 and Q4 is in an on state, and the other switching tube is in an off state.
The utility model discloses between the negative pole of two GM pipes and pulse shaping circuit, all concatenate an electronic switch for the pulse signal source of sending into pulse shaping circuit is single, thereby can reduce the requirement to CPU treatment performance, also makes measuring result more accurate reliable simultaneously.
Compared with the prior art, the utility model has the following beneficial effects;
the utility model discloses a detector circuit is simple, control is convenient, switch rapidly, has realized that the span reaches the integrative radiation detector of 9 orders of magnitude. The method can meet the requirement of measuring the environmental background, can be applied to high radiation places of more than 10Gy/h, and particularly can meet the requirement of online real-time monitoring of radiation places with radiation doses varying in a large range.
Drawings
Fig. 1 is a circuit diagram according to an embodiment of the present application.
Detailed Description
The invention will be described in further detail with reference to the following figures and examples, which are intended to facilitate the understanding of the invention without limiting it.
As shown in fig. 1, a dual-GM tube radiation detector with a range span of 9 orders of magnitude includes a high-range GM tube GMH, a low-range GM tube GML, a switching tube Q1, a switching tube Q2, a switching tube Q3, a switching tube Q4, a switching tube Q5, a switching tube Q6, a current-limiting resistor R1, a bypass resistor R2, a resistor R3, a resistor R4, a resistor R5, and a pulse shaping circuit.
The anode of the high-range GM tube GMH and the anode of the low-range GM tube GML are connected together, one end of a bypass resistor R2 and one end of a current-limiting resistor R1 are connected to the anode of the GM tube together, the other end of the bypass resistor R2 is connected with the collector of a switch tube Q1, and the emitter of the switch tube Q1 and the other end of the current-limiting resistor R1 are connected to a high-voltage input end HV together.
The bypass resistor R2 may be connected to the switching tube Q1 in the following manner: the bypass resistor R2 is connected to the emitter of the switching tube Q1 at the left side of the switching tube Q1, i.e., at one end of the bypass resistor R2, and the collector of the switching tube Q1 is connected to the anodes of the two GM tubes GMH and GML. The base of the switch tube Q1 is connected with one end of a resistor R3, the other end of the resistor R3 is connected with the collector of the switch tube Q2, the emitter of the switch tube Q2 is connected with the ground, and the base of the switch tube Q2 is connected with a control signal CT 1.
In order to reduce the charging time constant of the GM counting tube during the high-voltage charging, after a control signal CT1 sent by the controller is obtained, Q2 is conducted, and Q1 is also conducted, so that the high-voltage HV charges the GM tube through a bypass resistor R2 with a much smaller resistance value, preferably 10K omega for R2, and the charging time constant is tens of nanoseconds, thereby meeting the requirement of quick charging.
The emitter of the switching tube Q3 is connected with the cathode of the low-range GM tube GML, and the collector of the switching tube Q3 is connected with the pulse shaping circuit; the emitter of the switching tube Q4 is connected to the cathode of the high-range GM tube GMH, and the collector of the switching tube Q4 is connected to the pulse shaping circuit.
The base of the switch tube Q3 is connected with one end of a resistor R4, the other end of the resistor R4 is connected with the collector of the switch tube Q5, the base of the switch tube Q4 is connected with one end of a resistor R5, and the other end of the resistor R5 is connected with the collector of the switch tube Q6. Emitters of the switching tube Q5 and the switching tube Q6 are connected to the ground, and base stages of the switching tube Q5 and the switching tube Q6 are respectively connected with control signals CT2 and CT 3.
After power-on, the controller sends out control signals CT2 and CT3 to the switch tube Q5 and the switch tube Q6, the control signals CT2 and CT3 are mutually opposite, when CT3 is at high level, CT2 is at low level, and when CT3 is at low level, CT2 is at high level, therefore, at any time, both of the switch tubes Q5 and Q6 and only one of the switch tubes are in a conducting state.
When the CT2 is at high level, the switching tube Q5 is turned on, the switching tube Q3 is also turned on, the voltage drop across the low-range GML tube is normal, the switching tubes Q6 and Q4 are both in off state, and the voltage drop across the high-range GMH tube is not enough to make it in geiger-miller region and in sleep state. Vice versa, it is realized that at any time, only one GM pipe is in the working state, and the other GM pipe is in the dormant state. In short, the source of the pulse signal input to the pulse shaping circuit is single, which simplifies the processing logic of the CPU for the pulse signal.
By adopting the design, in a place with low dose rate, only the low-range GML tube with large sensitive volume is pressurized to enter a working state; in a high-dose place, only the high-range GMH tube with small sensitive volume works, and the low-range GML tube is in a dormant state. This allows the working life of the GM tube to be extended, especially in high radiation environments, which is particularly beneficial for the extension of the life.
The above-mentioned embodiment is to the technical solution and the beneficial effects of the present invention have been described in detail, it should be understood that the above is only the specific embodiment of the present invention, not used for limiting the present invention, any modification, supplement and equivalent replacement made within the principle scope of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. The double-GM tube radiation detector with the range span reaching 9 orders of magnitude is characterized by comprising a low-range GM tube GML, a high-range GM tube GMH and a pulse shaping circuit, wherein the anode of the low-range GM tube GML and the anode of the high-range GM tube GMH are connected with a power supply circuit;
the cathode of the low-range GM tube GML is connected with the pulse shaping circuit through a switching tube Q3, and the base electrode of a switching tube Q3 is sequentially connected with a resistor R4 and a switching tube Q5; the cathode of the high-range GM tube GMH is connected with the pulse shaping circuit through a switching tube Q4, and the base of the switching tube Q4 is sequentially connected with a resistor R5 and a switching tube Q6;
the switching tube Q5 and the switching tube Q6 respectively control the on-off of the switching tube Q3 and the switching tube Q4, and only one of the switching tube Q3 and the switching tube Q4 is in a conducting state at any moment.
2. The dual-GM tube radiation detector of claim 1 having a span of up to 9 orders of magnitude in range, wherein the anode of the low range GM tube GML and the anode of the high range GM tube GMH are connected together.
3. The dual GM tube radiation detector of claim 1 having a span of up to 9 orders of magnitude, wherein the power supply circuit includes a switching tube Q1, a switching tube Q2, a current limiting resistor R1, a bypass resistor R2, and a resistor R3; one end of the bypass resistor R2 and one end of the current limiting resistor R1 are connected to the anodes of the low range GM tube GML and the high range GM tube GMH, the other end of the bypass resistor R2 is connected to the collector of the switch tube Q1, the emitter of the switch tube Q1 and the other end of the current limiting resistor R1 are connected to the high voltage input end HV, the base of the switch tube Q1 is connected to one end of the resistor R3, the other end of the resistor R3 is connected to the collector of the switch tube Q2, the emitter of the switch tube Q2 is grounded, and the base of the switch tube Q2 is connected to the control signal CT 1.
4. The dual-GM tube radiation detector of claim 1 having a span of up to 9 orders of magnitude, wherein the emitter of the switching tube Q3 is connected to the cathode of the low-range GM tube GML and the collector of the switching tube Q3 is connected to the pulse shaping circuit; the emitter of the switching tube Q4 is connected with the cathode of the high-range GM tube GMH, and the collector of the switching tube Q4 is connected with the pulse shaping circuit.
5. The dual-GM tube radiation detector of claim 1 having a span of up to 9 orders of magnitude, wherein the emitters of the switching tube Q5 and the switching tube Q6 are grounded, the base stage is connected to the control signals CT2 and CT3, respectively, and the control signals CT2 and CT3 are control signals in opposite phases.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920404948.1U CN209946400U (en) | 2019-03-28 | 2019-03-28 | double-GM tube radiation detector with range span reaching 9 orders of magnitude |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920404948.1U CN209946400U (en) | 2019-03-28 | 2019-03-28 | double-GM tube radiation detector with range span reaching 9 orders of magnitude |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209946400U true CN209946400U (en) | 2020-01-14 |
Family
ID=69125665
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920404948.1U Expired - Fee Related CN209946400U (en) | 2019-03-28 | 2019-03-28 | double-GM tube radiation detector with range span reaching 9 orders of magnitude |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209946400U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112946720A (en) * | 2021-01-28 | 2021-06-11 | 北京方鸿智能科技有限公司 | Radiation measuring apparatus and method |
| CN113238274A (en) * | 2021-05-26 | 2021-08-10 | 西安中核核仪器有限公司 | Wide-range coaxial through-wall double-ionization-chamber area gamma radiation detection method |
-
2019
- 2019-03-28 CN CN201920404948.1U patent/CN209946400U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112946720A (en) * | 2021-01-28 | 2021-06-11 | 北京方鸿智能科技有限公司 | Radiation measuring apparatus and method |
| CN112946720B (en) * | 2021-01-28 | 2024-02-13 | 北京方鸿智能科技有限公司 | Radiation measurement device and method |
| CN113238274A (en) * | 2021-05-26 | 2021-08-10 | 西安中核核仪器有限公司 | Wide-range coaxial through-wall double-ionization-chamber area gamma radiation detection method |
| CN113238274B (en) * | 2021-05-26 | 2022-01-07 | 西安中核核仪器股份有限公司 | Wide-range coaxial through-wall double-ionization-chamber area gamma radiation detection method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN209946400U (en) | double-GM tube radiation detector with range span reaching 9 orders of magnitude | |
| CN104316950B (en) | Method and device for low-power radiation dose rate detection and wide-range scaling graduation | |
| CN203276080U (en) | Single-proton detector bias voltage generating circuit based on avalanche photodiode | |
| CN114755708A (en) | Wide-range gamma dosimeter with double GM counting tubes and monitoring method | |
| CN208588795U (en) | Can the controllable reactor turn-to-turn insulation overvoltage of electric discharge of remote reviewing examine equipment | |
| CN102707308A (en) | Single-GM counting tube wide-range radiation detection method | |
| CN203025354U (en) | Nuclear radiation monitor | |
| CN210038197U (en) | Infrared correlation device | |
| CN215768856U (en) | Gas discharge tube life detection device | |
| CN106842274B (en) | Alpha/beta surface pollution array detector and detection system | |
| CN201503496U (en) | Automatic switching circuit for double-GM counting tube | |
| CN207691759U (en) | A kind of tension measuring circuit | |
| CN205749862U (en) | The special interference source of calibration system is put in a kind of superfrequency office | |
| CN104931136A (en) | Wide pulse triggering-based phase-shift type high-sensitivity infrared detection system | |
| CN202166744U (en) | Nuclear radiation detector | |
| CN107942366B (en) | G-M counter tube measuring circuit | |
| CN217606096U (en) | Gegemiller counter signal acquisition circuit | |
| CN203825113U (en) | Filament testing device | |
| CN202886615U (en) | Overload detection circuit for flasher radiation detector | |
| CN207924010U (en) | A kind of high voltage safety alarm | |
| CN201656769U (en) | Collector supply for semiconductor characteristic curve tracers | |
| CN211905708U (en) | Double-counting-tube sampling circuit | |
| CN207690258U (en) | A kind of induction-type high-voltage warning device | |
| CN206993066U (en) | A kind of electric charge release circuit and ultraviolet light detection module for ultraviolet phototube | |
| CN207198340U (en) | The G M count pipe high_voltage isolation circuits realized using transistor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200114 Termination date: 20210328 |