CN105547409B - Passive core article position measuring device and method - Google Patents
Passive core article position measuring device and method Download PDFInfo
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- CN105547409B CN105547409B CN201511023224.5A CN201511023224A CN105547409B CN 105547409 B CN105547409 B CN 105547409B CN 201511023224 A CN201511023224 A CN 201511023224A CN 105547409 B CN105547409 B CN 105547409B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
- G01F23/22—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water
- G01F23/28—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm by measuring physical variables, other than linear dimensions, pressure or weight, dependent on the level to be measured, e.g. by difference of heat transfer of steam or water by measuring the variations of parameters of electromagnetic or acoustic waves applied directly to the liquid or fluent solid material
- G01F23/284—Electromagnetic waves
- G01F23/288—X-rays; Gamma rays or other forms of ionising radiation
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Abstract
Passive core article position measuring device and method belong to core Level measurement field, it is easy to cause damages to survey crew and environment to solve existing core material level detector radiation source when measuring, and the problem of measurement result stability difference.The present invention measures the radiation ray energy that substances to be measured itself is released in tank body by gamma radiation detector, and whether the level that measured matter in tank body is obtained according to its energy changing characteristics reaches calibration value, and then export measuring signal, when in tank body without medium, energy is minimum, when there is medium in tank body, energy becomes larger, and the situation of change of level is judged by comparison.And the present invention increases the receiving area of radiation in the form of side receives, and the number of pulses of reception increases so that final measurement result stability is improved.Passive nucleon article position measuring device of the present invention and method are suitable for carrying out Level measurement to the medium containing radionuclide.
Description
Technical field
The invention belongs to core Level measurement fields.
Background technology
For many years, the core material level detector of domestic application is made of detector, radiation source, secondary meter three parts,
What is used is mostly active radiation source, and radiation intensity is larger, there is certain harm to user of service's safety and ambient enviroment, with
The requirement of the development of national economy, environmental protection is also stringenter, and the thing followed is proposed newly to Level measurement technology
More demands.The passive type core material level detector of existing Publication No. 103712668A, the seed nucleus material level detector use
The mode of end surface measurement, in detection process, the receiving area of radiation is small, it is few to receive umber of pulse so that the stabilization of measurement result
Property is poor.
Invention content
It includes radiation source that the present invention, which is to solve the radionuclide that existing core material level detector contains, is being measured
When the radiation source be easy to cause damages to survey crew and environment, and the problem of measurement result stability difference now provides passive
Core article position measuring device and method.
Passive core article position measuring device, it includes：Gamma radiation detector 8, power supply 20, signal processor and data processing mould
Block；
Gamma radiation detector 8 includes：Detector connection cover 7, probe body 9, sheet lead sheath rubber cushion 10, sheet lead sheath
11, photomultiplier 12, stainless steel sheath 13, scintillation crystal 14, fastening pad 15, protection sheet lead 16, detector bottom cover 17 and point
Press emitter follower 25；
Signal processor includes：Amplification shaping device, threshold value discriminator and impulse analyzer；
Sheet lead sheath 11 includes sheet lead portion, one, plastics and two, plastics, and sheet lead portion is surrounded with one, plastics in a circle
Tubular, and the circumferential ratio of sheet lead portion and one, plastics is 2:1, two, plastics are cylindrical, and diameter and sheet lead portion and plastics
One cylinder surrounded is identical, and one end of two, one end and the plastics of cylinder is connected, and one, plastics and two, plastics are in one
Formula structure；
Stainless steel sheath 13 is cylindrical, and the end of the stainless steel sheath 13 is by protecting sheet lead 16 to seal, stainless steel shield
The head end of set 13 is sealed by the sealed end of detector connection cover 7,15 equal position of photomultiplier 12, scintillation crystal 14 and fastening pad
Inside stainless steel sheath 13, fastening pad 15 be fixed on protection sheet lead 16 on, scintillation crystal 14 be located at photomultiplier 12 and tightly
Gu between pad 15, sheet lead sheath 11 is socketed in 13 outer surface of stainless steel sheath, and sheet lead portion and one, plastics in sheet lead sheath 11
The cylindrical portions surrounded are located at 14 outside of scintillation crystal, and sheet lead sheath rubber cushion 10 is socketed on the outside of sheet lead sheath 11, outside detector
Shell 9 is socketed in 10 outside of sheet lead sheath rubber cushion, and the end of sheet lead sheath rubber cushion 10 is sealed by detector bottom cover 17；
Photomultiplier 12 acquires the photoelectron signal that scintillation crystal 14 is sent out, the photo-multiplier letter of photomultiplier 12
The photo-multiplier signal input part of number output end connection partial pressure emitter follower 25, partial pressure emitter follower 25 are additionally operable to as photomultiplier
12 superchargings, the pulse signal input terminal of the pulse signal output end connection amplification shaping device of partial pressure emitter follower 25, amplification shaping device
Amplified signal output end connection threshold value discriminator amplified signal input terminal, threshold value discriminator nucleic signal output end connection
The nucleic signal input part of impulse analyzer, the nucleic point of the signal Analysis output end connection data processing module of impulse analyzer
Analyse signal input part；
Data processing module further includes such as lower unit：
Measurement parameter collecting unit：When containing radionuclide medium in tank body to be measured, real-time acquisition pulse analyzer
The signal Analysis of output is as measurement parameter；
Calibrating parameters collecting unit；When being free of radionuclide medium in tank body to be measured, the output of acquisition pulse analyzer
Signal Analysis as calibrating parameters；
Judging unit：Measurement parameter is compared with calibrating parameters, judges whether measurement parameter is more than calibrating parameters, is
Then the radioactivity material in tank body to be measured reaches limit height, and otherwise the radioactivity material in tank body to be measured not up to limits high
Degree.
Passive core article position measuring method, this method are realized based on following device, and described device includes：Gamma radiation detector
8, power supply 20 and signal processor；
Gamma radiation detector 8 includes：Detector connection cover 7, probe body 9, sheet lead sheath rubber cushion 10, sheet lead sheath
11, photomultiplier 12, stainless steel sheath 13, scintillation crystal 14, fastening pad 15, protection sheet lead 16, detector bottom cover 17 and point
Press emitter follower 25；
Signal processor includes：Amplification shaping device, threshold value discriminator and impulse analyzer；
Sheet lead sheath 11 includes sheet lead portion, one, plastics and two, plastics, and sheet lead portion is surrounded with one, plastics in a circle
Tubular, and the circumferential ratio of sheet lead portion and one, plastics is 2:1, two, plastics are cylindrical, and diameter and sheet lead portion and plastics
One cylinder surrounded is identical, and one end of two, one end and the plastics of cylinder is connected, and one, plastics and two, plastics are in one
Formula structure；
Stainless steel sheath 13 is cylindrical, and the end of the stainless steel sheath 13 is by protecting sheet lead 16 to seal, stainless steel shield
The head end of set 13 is sealed by the sealed end of detector connection cover 7,15 equal position of photomultiplier 12, scintillation crystal 14 and fastening pad
Inside stainless steel sheath 13, fastening pad 15 be fixed on protection sheet lead 16 on, scintillation crystal 14 be located at photomultiplier 12 and tightly
Gu between pad 15, sheet lead sheath 11 is socketed in 13 outer surface of stainless steel sheath, and sheet lead portion and one, plastics in sheet lead sheath 11
The cylindrical portions surrounded are located at 14 outside of scintillation crystal, and sheet lead sheath rubber cushion 10 is socketed on the outside of sheet lead sheath 11, outside detector
Shell 9 is socketed in 10 outside of sheet lead sheath rubber cushion, and the end of sheet lead sheath rubber cushion 10 is sealed by detector bottom cover 17；
Photomultiplier 12 acquires the photoelectron signal that scintillation crystal 14 is sent out, the photo-multiplier letter of photomultiplier 12
The photo-multiplier signal input part of number output end connection partial pressure emitter follower 25, partial pressure emitter follower 25 are additionally operable to as photomultiplier
12 superchargings, the pulse signal input terminal of the pulse signal output end connection amplification shaping device of partial pressure emitter follower 25, amplification shaping device
Amplified signal output end connection threshold value discriminator amplified signal input terminal, threshold value discriminator nucleic signal output end connection
The nucleic signal input part of impulse analyzer；
It the described method comprises the following steps：
Demarcating steps：The analysis letter that acquisition pulse analyzer obtains when being free of radionuclide medium in tank body to be measured
Number, and using the signal Analysis as calibrating parameters；
Measuring process：When containing radionuclide medium in tank body to be measured, what real-time acquisition pulse analyzer obtained divides
Signal is analysed, and using the signal Analysis as measurement parameter；
Judgment step：Measurement parameter is compared with calibrating parameters, judges whether measurement parameter is more than calibrating parameters, is
Then the radioactivity material in tank body to be measured reaches limit height, and terminates to measure；Otherwise the radioactivity material in tank body to be measured is not
Reach limit height, return measurement step re-starts measurement.
Passive nucleon article position measuring device of the present invention measures substances to be measured in tank body by gamma radiation detector
The radiation ray energy itself released, and whether reached according to the level of measured matter in its energy changing characteristics acquisition tank body
To calibration value, and then measuring signal is exported, when in tank body without medium, energy is minimum, and the umber of pulse measured is minimum, works as tank
When having medium in vivo, energy becomes larger, and the umber of pulse measured becomes more, and the situation of change of level is judged by comparison.And this
The invention passive nucleon article position measuring device increases the receiving area of radiation in the form of side receives, receives
Number of pulses increase so that final measurement result stability is improved.
Passive nucleon article position measuring method of the present invention measures substances to be measured in tank body by gamma radiation detector
The radiation ray energy itself released, and obtain radial energy contained by measured matter in tank body according to its energy changing characteristics
Size is measured, finally the parameter of measurement is made comparisons with calibrating parameters, so that it is determined that whether level reaches standard.
The tank body to be measured of the present invention is not contacted with measured medium simultaneously, is not necessarily to the trepanning on tank body, and do not use radiation source,
Securely and reliably, it will not cause damages to personnel and environment.
Passive nucleon article position measuring device of the present invention and method are suitable for carrying out the medium containing radionuclide
Level measurement.
Description of the drawings
Fig. 1 is the sectional view of passive nucleon article position measuring device of the present invention；
Fig. 2 is the portions the A enlarged drawing of Fig. 1；
Fig. 3 is the electrical structure schematic diagram of passive nucleon article position measuring device of the present invention；
Fig. 4 is the overall structure diagram of passive nucleon article position measuring device of the present invention；
Fig. 5 is the structural schematic diagram in the sheet lead sheath sheet lead portion described in specific implementation mode one；
Fig. 6 is the flow chart of the passive nucleon article position measuring method described in specific implementation mode seven.
Specific implementation mode
Specific implementation mode one：Present embodiment is illustrated referring to figs. 1 to Fig. 5, the passive core described in present embodiment
Article position measuring device, it includes：Gamma radiation detector 8, power supply 20, signal processor and data processing module；
Gamma radiation detector 8 includes：Detector connection cover 7, probe body 9, sheet lead sheath rubber cushion 10, sheet lead sheath
11, photomultiplier 12, stainless steel sheath 13, scintillation crystal 14, fastening pad 15, protection sheet lead 16, detector bottom cover 17 and point
Press emitter follower 25；
Signal processor includes：Amplification shaping device, threshold value discriminator and impulse analyzer；
Sheet lead sheath 11 includes sheet lead portion, one, plastics and two, plastics, and sheet lead portion is surrounded with one, plastics in a circle
Tubular, and the circumferential ratio of sheet lead portion and one, plastics is 2:1, two, plastics are cylindrical, and diameter and sheet lead portion and plastics
One cylinder surrounded is identical, and one end of two, one end and the plastics of cylinder is connected, and one, plastics and two, plastics are in one
Formula structure；
Stainless steel sheath 13 is cylindrical, and the end of the stainless steel sheath 13 is by protecting sheet lead 16 to seal, stainless steel shield
The head end of set 13 is sealed by the sealed end of detector connection cover 7,15 equal position of photomultiplier 12, scintillation crystal 14 and fastening pad
Inside stainless steel sheath 13, fastening pad 15 be fixed on protection sheet lead 16 on, scintillation crystal 14 be located at photomultiplier 12 and tightly
Gu between pad 15, sheet lead sheath 11 is socketed in 13 outer surface of stainless steel sheath, and sheet lead portion and one, plastics in sheet lead sheath 11
The cylindrical portions surrounded are located at 14 outside of scintillation crystal, and sheet lead sheath rubber cushion 10 is socketed on the outside of sheet lead sheath 11, outside detector
Shell 9 is socketed in 10 outside of sheet lead sheath rubber cushion, and the end of sheet lead sheath rubber cushion 10 is sealed by detector bottom cover 17；
Photomultiplier 12 acquires the photoelectron signal that scintillation crystal 14 is sent out, the photo-multiplier letter of photomultiplier 12
The photo-multiplier signal input part of number output end connection partial pressure emitter follower 25, partial pressure emitter follower 25 are additionally operable to as photomultiplier
12 superchargings, the pulse signal input terminal of the pulse signal output end connection amplification shaping device of partial pressure emitter follower 25, amplification shaping device
Amplified signal output end connection threshold value discriminator amplified signal input terminal, threshold value discriminator nucleic signal output end connection
The nucleic signal input part of impulse analyzer, the nucleic point of the signal Analysis output end connection data processing module of impulse analyzer
Analyse signal input part；
Data processing module further includes such as lower unit：
Measurement parameter collecting unit：When containing radionuclide medium in tank body to be measured, real-time acquisition pulse analyzer
The signal Analysis of output is as measurement parameter；
Calibrating parameters collecting unit；When being free of radionuclide medium in tank body to be measured, the output of acquisition pulse analyzer
Signal Analysis as calibrating parameters；
Judging unit：Measurement parameter is compared with calibrating parameters, judges whether measurement parameter is more than calibrating parameters, is
Then the radioactivity material in tank body to be measured reaches limit height, and otherwise the radioactivity material in tank body to be measured not up to limits high
Degree.
In present embodiment, when the irradiation with radiation that the radiativity material in tank body to be measured radiates to scintillation crystal 14
On, excitation scintillation crystal 14 emits light out electronics, and photomultiplier 12 incudes photoelectronic intensity at this time, and inductive signal is sent out
Sending the emitter follower part to partial pressure emitter follower 25 is enhanced, while the divided fraction for dividing emitter follower 25 is also photomultiplier
12 are pressurized.The photoelectron intensity value of standard is set in threshold value discriminator, when threshold value discriminator receives amplification shaping device
When the photoelectron signal of transmission, if the photoelectron signal is more than the photoelectron intensity value of standard, it was demonstrated that the photoelectron obtained at this time
Signal reaches standard, and then can be analyzed by impulse analyzer, if the photoelectron that the photoelectron signal is less than standard is strong
Angle value, then currently detected photoelectron signal can not reach standard, then re-start acquisition.Due to the spy of sheet lead sheath 11
Different structure so that radiation is radiated from one, the plastics of sheet lead sheath 11 on scintillation crystal 14, i.e. the side of gamma radiation detector 8
Face is radiated, and relative to the mode of existing end surface measurement, increases the receiving area of radiation, the number of pulses of reception increases
Add so that final measurement result stability improves 60%.
It is fitted close between sheet lead sheath rubber cushion 10 and sheet lead sheath 11, sheet lead sheath 11 and protection sheet lead 16 are for shielding
The natural ray of nature improves the measurement stability of product.Fastening pad 15 is sponge, is completely filled in scintillation crystal 14 and prevents
It protects between sheet lead 16, prevents hard contact damage scintillation crystal 14, while scintillation crystal 14 and photomultiplier 12 can also be fastened.
Specific implementation mode two：Present embodiment is made to the passive core article position measuring device described in specific implementation mode one
It further illustrates, in present embodiment, scintillation crystal 14 is plastic crystal or sodium iodide crystal.
It is cost-effective using plastic crystal or sodium iodide crystal in present embodiment.
Specific implementation mode three：Present embodiment is made to the passive core article position measuring device described in specific implementation mode one
It further illustrates, in present embodiment, it further includes：Display unit, input unit and output unit；
The display signal output end of the display signal input part connection data processing module of display unit, the display unit are
Liquid crystal display 18,
The setting parameter signal input terminal of the setting parameter signal output end connection data processing module of input unit,
The on-off model output end of the on-off model input terminal connection data processing module of output unit.
In present embodiment, output unit includes：Output circuit and relay, the handling result of data processing module is by opening
It measures signal output end and connects output unit in pass；Input unit is made of button, main to realize parameter modification and setting；Display unit
It shows measured parameter value, number is shown using liquid crystal display, it is more accurate and intuitive.
Specific implementation mode four：Present embodiment is made to the passive core article position measuring device described in specific implementation mode three
It further illustrates, in present embodiment, it further includes：Host shell lid 1, display unit support plate 2, processor support plate 3, electricity
Source support plate 4, main case housing 5, fixed frame 6, power supply 20, line connector 26 and photomultiplier fixed seat 27；
Line connector 26 is located inside detector connection cover 7, and passes through photomultiplier fixed seat 27 and photomultiplier transit
Pipe 12 is fixed on together in detector connection cover 7, and partial pressure emitter follower 25 is fixed on line connector 26, and partial pressure emitter follower 25 is logical
The signal-transmitting cable 24 crossed on line connector 26 is connected with power supply 20, and the end of fixed frame 6 is fixed on detector connection cover 7
Connecting pin on, the end of main case housing 5 is fixed on the head end of fixed frame 6, and power supply support plate 4 is fixed on main case housing 5
Head end, signal-transmitting cable 24 sequentially passes through fixed frame 6, main case housing 5 and power supply support plate 4 and is connected with power supply 20, electricity
Source 20 is fixed in power supply support plate 4, and processor support plate 3 is fixed on by connecting copper post 19 in power supply support plate 4, and display is single
First support plate 2 is fixed on by connecting copper post 19 in processor support plate 3, and signal processor is fixed in processor support plate 3,
Liquid crystal display 18 is fixed in display unit support plate 2；
Host shell lid 1 can snap onto in main case housing 5.
In present embodiment, when host shell lid 1 snaps onto in main case housing 5, what is carried in main case housing 5 is aobvious
Show that unit supports plate 2, processor support plate 3, power supply support plate 4 and liquid crystal display 18 are entirely located in inside host shell lid 1,
Host shell lid 1 plays a protective role to all devices of its inside.
Specific implementation mode five：Present embodiment is made to the passive core article position measuring device described in specific implementation mode four
It further illustrates, in present embodiment, the opening of host shell lid 1 is equipped with waterproof case 28.
Specific implementation mode six：Present embodiment is made to the passive core article position measuring device described in specific implementation mode four
It further illustrates, in present embodiment, it further includes：Connection terminal 21, signal cable 22 and locking wire mouth 23；
Locking wire mouth 23 is fixed on the side wall of main case housing 5, and for locking signal cable 22, connection terminal 21 is used for will
One end of signal cable 22 is connected with signal processor, and the other end of signal cable 22 passes through main case housing 5 and locking wire mouth
23 are connected with data processing module.
Specific implementation mode seven：Present embodiment is illustrated with 6 referring to Fig.1, the passive core object described in present embodiment
Position measurement method, this method are realized based on following device, and described device includes：At gamma radiation detector 8, power supply 20 and signal
Manage device；
Gamma radiation detector 8 includes：Detector connection cover 7, probe body 9, sheet lead sheath rubber cushion 10, sheet lead sheath
11, photomultiplier 12, stainless steel sheath 13, scintillation crystal 14, fastening pad 15, protection sheet lead 16, detector bottom cover 17 and point
Press emitter follower 25；
Signal processor includes：Amplification shaping device, threshold value discriminator and impulse analyzer；
Sheet lead sheath 11 includes sheet lead portion, one, plastics and two, plastics, and sheet lead portion is surrounded with one, plastics in a circle
Tubular, and the circumferential ratio of sheet lead portion and one, plastics is 2:1, two, plastics are cylindrical, and diameter and sheet lead portion and plastics
One cylinder surrounded is identical, and one end of two, one end and the plastics of cylinder is connected, and one, plastics and two, plastics are in one
Formula structure；
Stainless steel sheath 13 is cylindrical, and the end of the stainless steel sheath 13 is by protecting sheet lead 16 to seal, stainless steel shield
The head end of set 13 is sealed by the sealed end of detector connection cover 7,15 equal position of photomultiplier 12, scintillation crystal 14 and fastening pad
Inside stainless steel sheath 13, fastening pad 15 be fixed on protection sheet lead 16 on, scintillation crystal 14 be located at photomultiplier 12 and tightly
Gu between pad 15, sheet lead sheath 11 is socketed in 13 outer surface of stainless steel sheath, and sheet lead portion and one, plastics in sheet lead sheath 11
The cylindrical portions surrounded are located at 14 outside of scintillation crystal, and sheet lead sheath rubber cushion 10 is socketed on the outside of sheet lead sheath 11, outside detector
Shell 9 is socketed in 10 outside of sheet lead sheath rubber cushion, and the end of sheet lead sheath rubber cushion 10 is sealed by detector bottom cover 17；
Photomultiplier 12 acquires the photoelectron signal that scintillation crystal 14 is sent out, the photo-multiplier letter of photomultiplier 12
The photo-multiplier signal input part of number output end connection partial pressure emitter follower 25, partial pressure emitter follower 25 are additionally operable to as photomultiplier
12 superchargings, the pulse signal input terminal of the pulse signal output end connection amplification shaping device of partial pressure emitter follower 25, amplification shaping device
Amplified signal output end connection threshold value discriminator amplified signal input terminal, threshold value discriminator nucleic signal output end connection
The nucleic signal input part of impulse analyzer；
It the described method comprises the following steps：
Demarcating steps：The analysis letter that acquisition pulse analyzer obtains when being free of radionuclide medium in tank body to be measured
Number, and using the signal Analysis as calibrating parameters；
Measuring process：When containing radionuclide medium in tank body to be measured, what real-time acquisition pulse analyzer obtained divides
Signal is analysed, and using the signal Analysis as measurement parameter；
Judgment step：Measurement parameter is compared with calibrating parameters, judges whether measurement parameter is more than calibrating parameters, is
Then the radioactivity material in tank body to be measured reaches limit height, and terminates to measure；Otherwise the radioactivity material in tank body to be measured is not
Reach limit height, return measurement step re-starts measurement.
Claims (7)
1. passive core article position measuring device, which is characterized in that it includes：Gamma radiation detector (8), power supply (20), signal processing
Device and data processing module；
Gamma radiation detector (8) includes：Detector connection cover (7), probe body (9), sheet lead sheath rubber cushion (10), sheet lead shield
It covers (11), photomultiplier (12), stainless steel sheath (13), scintillation crystal (14), fastening pad (15), protection sheet lead (16), visit
Survey device bottom cover (17) and partial pressure emitter follower (25)；
Signal processor includes：Amplification shaping device, threshold value discriminator and impulse analyzer；
Sheet lead sheath (11) includes sheet lead portion, one, plastics and two, plastics, and sheet lead portion is surrounded with one, plastics in a cylinder
Shape, and the circumferential ratio of sheet lead portion and one, plastics is 2:1, two, plastics are cylindrical, and diameter and sheet lead portion and plastics one
The cylinder that portion surrounds is identical, and one end of two, one end and the plastics of cylinder is connected, and one, plastics and two, plastics are in integral type
Structure；
Stainless steel sheath (13) is cylindrical, and the end of the stainless steel sheath (13) is by protecting sheet lead (16) to seal, stainless steel
The head end of sheath (13) is sealed by the sealed end of detector connection cover (7), photomultiplier (12), scintillation crystal (14) and tightly
Gu pad (15) is respectively positioned on, stainless steel sheath (13) is internal, and fastening pad (15) is fixed on protection sheet lead (16), scintillation crystal (14)
Between photomultiplier (12) and fastening pad (15), sheet lead sheath (11) is socketed in stainless steel sheath (13) outer surface, and
Sheet lead portion is located at one cylindrical portions surrounded of plastics on the outside of scintillation crystal (14) in sheet lead sheath (11), sheet lead sheath rubber cushion
(10) it is socketed on the outside of sheet lead sheath (11), probe body (9) is socketed on the outside of sheet lead sheath rubber cushion (10), sheet lead sheath glue
The end for padding (10) is sealed by detector bottom cover (17)；
The photoelectron signal that photomultiplier (12) acquisition scintillation crystal (14) is sent out, the photo-multiplier of photomultiplier (12)
The photo-multiplier signal input part of signal output end connection partial pressure emitter follower (25), partial pressure emitter follower (25) are additionally operable to as photoelectricity
Multiplier tube (12) is pressurized, the pulse signal input terminal of the pulse signal output end connection amplification shaping device of partial pressure emitter follower (25),
The amplified signal input terminal of the amplified signal output end connection threshold value discriminator of amplification shaping device, the nucleic signal of threshold value discriminator
Output end connects the nucleic signal input part of impulse analyzer, and the signal Analysis output end of impulse analyzer connects data processing mould
The Radionuclide analysis signal input part of block；
Data processing module further includes such as lower unit：
Measurement parameter collecting unit：When containing radionuclide medium in tank body to be measured, real-time acquisition pulse analyzer output
Signal Analysis as measurement parameter；
Calibrating parameters collecting unit；When being free of radionuclide medium in tank body to be measured, point of acquisition pulse analyzer output
Signal is analysed as calibrating parameters；
Judging unit：Measurement parameter is compared with calibrating parameters, judges whether measurement parameter is more than calibrating parameters, is to wait for
The radioactivity material surveyed in tank body reaches limit height, and otherwise the radioactivity material in tank body to be measured not up to limits height.
2. passive core article position measuring device according to claim 1, which is characterized in that scintillation crystal (14) is plastic crystal
Or sodium iodide crystal.
3. passive core article position measuring device according to claim 1, which is characterized in that it further includes：Display unit, input
Unit and output unit；
The display signal output end of the display signal input part connection data processing module of display unit, which is liquid crystal
Display screen (18),
The setting parameter signal input terminal of the setting parameter signal output end connection data processing module of input unit,
The on-off model output end of the on-off model input terminal connection data processing module of output unit.
4. passive core article position measuring device according to claim 3, which is characterized in that it further includes：Host shell lid
(1), display unit support plate (2), processor support plate (3), power supply support plate (4), main case housing (5), fixed frame (6),
Power supply (20), line connector (26) and photomultiplier fixed seat (27)；
Line connector (26) is located at detector connection cover (7) inside, and passes through photomultiplier fixed seat (27) and photoelectricity times
Increase pipe (12) to be fixed on together in detector connection cover (7), partial pressure emitter follower (25) is fixed on line connector (26), is divided
Emitter follower (25) is connected by the signal-transmitting cable (24) on line connector (26) with power supply (20), the end of fixed frame (6)
End is fixed on the connecting pin of detector connection cover (7), and the end of main case housing (5) is fixed on the head end of fixed frame (6), electricity
Source support plate (4) is fixed on the head end of main case housing (5), and signal-transmitting cable (24) sequentially passes through fixed frame (6), main case
Housing (5) and power supply support plate (4) are connected with power supply (20), and power supply (20) is fixed in power supply support plate (4), processor support
Plate (3) is fixed on by connecting copper post (19) in power supply support plate (4), and display unit support plate (2) is by connecting copper post (19)
It is fixed in processor support plate (3), signal processor is fixed in processor support plate (3), and liquid crystal display (18) is fixed
In display unit support plate (2)；
Host shell lid (1) can snap onto in main case housing (5).
5. passive core article position measuring device according to claim 4, which is characterized in that the opening of host shell lid (1)
Equipped with waterproof case (28).
6. passive core article position measuring device according to claim 4, which is characterized in that it further includes：Connection terminal (21),
Signal cable (22) and locking wire mouth (23)；
Locking wire mouth (23) is fixed on the side wall of main case housing (5), and for locking signal cable (22), connection terminal (21) is used
It is connected with signal processor in by one end of signal cable (22), the other end of signal cable (22) passes through main case housing
(5) it is connected with data processing module with locking wire mouth (23).
7. passive core article position measuring method, which is characterized in that this method is realized based on following device, and described device includes：γ
Radiation detector (8), power supply (20) and signal processor；
Gamma radiation detector (8) includes：Detector connection cover (7), probe body (9), sheet lead sheath rubber cushion (10), sheet lead shield
It covers (11), photomultiplier (12), stainless steel sheath (13), scintillation crystal (14), fastening pad (15), protection sheet lead (16), visit
Survey device bottom cover (17) and partial pressure emitter follower (25)；
Signal processor includes：Amplification shaping device, threshold value discriminator and impulse analyzer；
Sheet lead sheath (11) includes sheet lead portion, one, plastics and two, plastics, and sheet lead portion is surrounded with one, plastics in a cylinder
Shape, and the circumferential ratio of sheet lead portion and one, plastics is 2:1, two, plastics are cylindrical, and diameter and sheet lead portion and plastics one
The cylinder that portion surrounds is identical, and one end of two, one end and the plastics of cylinder is connected, and one, plastics and two, plastics are in integral type
Structure；
Stainless steel sheath (13) is cylindrical, and the end of the stainless steel sheath (13) is by protecting sheet lead (16) to seal, stainless steel
The head end of sheath (13) is sealed by the sealed end of detector connection cover (7), photomultiplier (12), scintillation crystal (14) and tightly
Gu pad (15) is respectively positioned on, stainless steel sheath (13) is internal, and fastening pad (15) is fixed on protection sheet lead (16), scintillation crystal (14)
Between photomultiplier (12) and fastening pad (15), sheet lead sheath (11) is socketed in stainless steel sheath (13) outer surface, and
Sheet lead portion is located at one cylindrical portions surrounded of plastics on the outside of scintillation crystal (14) in sheet lead sheath (11), sheet lead sheath rubber cushion
(10) it is socketed on the outside of sheet lead sheath (11), probe body (9) is socketed on the outside of sheet lead sheath rubber cushion (10), sheet lead sheath glue
The end for padding (10) is sealed by detector bottom cover (17)；
The photoelectron signal that photomultiplier (12) acquisition scintillation crystal (14) is sent out, the photo-multiplier of photomultiplier (12)
The photo-multiplier signal input part of signal output end connection partial pressure emitter follower (25), partial pressure emitter follower (25) are additionally operable to as photoelectricity
Multiplier tube (12) is pressurized, the pulse signal input terminal of the pulse signal output end connection amplification shaping device of partial pressure emitter follower (25),
The amplified signal input terminal of the amplified signal output end connection threshold value discriminator of amplification shaping device, the nucleic signal of threshold value discriminator
Output end connects the nucleic signal input part of impulse analyzer；
It the described method comprises the following steps：
Demarcating steps：The signal Analysis that acquisition pulse analyzer obtains when being free of radionuclide medium in tank body to be measured, and
Using the signal Analysis as calibrating parameters；
Measuring process：When containing radionuclide medium in tank body to be measured, the analysis that real-time acquisition pulse analyzer obtains is believed
Number, and using the signal Analysis as measurement parameter；
Judgment step：Measurement parameter is compared with calibrating parameters, judges whether measurement parameter is more than calibrating parameters, is to wait for
The radioactivity material surveyed in tank body reaches limit height, and terminates to measure；Otherwise the radioactivity material in tank body to be measured is not up to
Limit height, return measurement step re-start measurement.
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| CN109884686B (en) * | 2019-03-18 | 2020-12-11 | 中国原子能科学研究院 | Radioactive source position detection device |
| CN109974811A (en) * | 2019-04-15 | 2019-07-05 | 上海沃纳机电设备有限公司 | A kind of array radiation level-sensing device and its measurement method |
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