CN104569006B - Device and method for detecting cracks of radioactive waste cement solidified body in waste drum - Google Patents
Device and method for detecting cracks of radioactive waste cement solidified body in waste drum Download PDFInfo
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- CN104569006B CN104569006B CN201510024105.5A CN201510024105A CN104569006B CN 104569006 B CN104569006 B CN 104569006B CN 201510024105 A CN201510024105 A CN 201510024105A CN 104569006 B CN104569006 B CN 104569006B
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Abstract
The invention discloses a device for detecting cracks of a radioactive waste cement solidified body in a waste drum. The device comprises a conveyor belt, a gamma ray generator, a gamma ray detector system, an analysis and processing system and a feedback control system. The conveyor belt is used for conveying a to-be-tested waste drum; the gamma ray generator generates gamma rays which are acquired by the gamma ray detector system after being attenuated by the waste drum and then sent to the analysis and processing system so as to be analyzed. According to the device, the gamma rays are used for performing scan detection on the solidified body, whether the solidified body meets the solidification requirement is judged according to the porosity and the cracks, and the subsequent solidification process is controlled by use of the feedback control system; as a result, the problems of chemical detection lag of the solidified body, complex sampling and complex sample preparation process are solved, and whether the solidified body is satisfied can be judged very timely according to the porosity and the cracks; the device has the advantages of realizing full-automatic detection feedback and reducing human factor caused errors.
Description
Technical field
The present invention relates to a kind of radwaste solidified cement body detecting system, radioactivity in more particularly, to a kind of pail for used dressings
Waste solidified cement body crack detecting device and method.
Background technology
Radwaste cement solidification is using cement as main inorganic gel materials, mixes the mixing of pozzolanic activity
Material, the additive improving mix slurry and some performances of Behavior of Hardened Cement Paste and fiber, are added water, mixs with waste according to a certain ratio, sharp
With the hydraulicity of cement and mixing material, mix slurry is made to form the solidification with some strength and durability after certain curing period
Body.Because its have handling process simple, without high temperature, cured product good stability, low cost the features such as be widely used in core
Radwastes treatment in power station and other nuclear facilities.But in preparation process, the proportioning of waste liquid, cement and additive is not
When or stirring uneven firming body can be made to form multiple holes and crack, thus cause nuclide leaching rate raise, comprcssive strength
The adverse effects such as reduction are so that firming body can not meet solidifying requirements.
At present, firming body inspection mainly adopts traditional chemical analyses means, by too many levels such as sampling, sample preparation, chemical examinations
Obtain the indices such as leachability, the comprcssive strength of firming body.But, this traditional mode need longer time it is impossible to
Feedback curing body information in time；And firming body is encapsulated in mixed mud bucket or steel drum in the form of solid-state, need complexity
Sampling, sample preparation process procedure.
Content of the invention
The purpose of the present invention is that offer one kind solves the above problems, and whether infers firming body by porosity and crack
Meet solidifying requirements, thus the proportioning to waste liquid, cement and additive and stir speed (S.S.) carry out feedback regulation.Can be to firming body
Real-time detection, solving the problems, such as can not be in the complicated pail for used dressings of feedback curing body information and sampling in time, sample preparation process procedure
Radwaste solidified cement body crack detecting device and method.
To achieve these goals, the technical solution used in the present invention is such：A kind of pail for used dressings medium level waste
Solidified cement body crack detecting device it is characterised in that：
Including conveyer belt, for transmitting pail for used dressings；
It is arranged on the gamma ray generating meanss of conveyer belt side, for producing gamma ray；
It is arranged on conveyer belt opposite side, positioned at the gamma-ray detector system on gamma ray generating meanss opposite, be used for
Detect by the generation of gamma ray generating meanss, the gamma ray after firming body decay in pail for used dressings, and be translated into pulse
Signal matrix；
It is arranged on the fixing device of conveyer belt both sides, be used for fixing gamma ray generating meanss and gamma-ray detector system
System, can adjust the two height and the distance with conveyer belt；
The analysis process system being connected with the outfan of gamma-ray detector system, for obtaining pulse signal matrix,
The 2-D gray image of pail for used dressings scanning survey is set up after process, and figure with qualified radwaste solidified cement body by it
As information contrast, judge whether tested pail for used dressings medium level waste solidified cement body is qualified；
The feedback control system being connected with the outfan of analysis process system, described feedback control system connects Spent Radioactive
The matching device of thing solidified cement body and mixing control device, according to the information of analysis process system, control waste liquid in matching device,
The proportioning of cement and additive and the stir speed (S.S.) of mixing control device.
In the present invention, conveyer belt transmission pail for used dressings to be detected, gamma ray generating meanss produce gamma ray, through useless
After firming body decay in thing bucket, detected by gamma-ray detector system, and be converted into pulse signal matrix, through analyzing and processing
After system is processed, judge whether tested pail for used dressings medium level waste solidified cement body is qualified；If unqualified, by anti-
Feedback control system controls the proportioning of waste liquid, cement and additive and the stir speed (S.S.) of mixing control device in matching device, qualified
Then do not do any operation.The present invention can be with detection of radioactive waste solidified cement body in preparation process, waste liquid, cement and interpolation
The proportioning of agent is improper or stirs the uneven hole causing and crack, thus adjustment stir speed (S.S.) and waste liquid, cement in time
Proportioning with additive, it is to avoid in traditional approach, by the too many levels such as sampling, sample preparation, chemical examination obtain firming body leachability,
The indices such as comprcssive strength, thus leading to detection time long it is impossible to feedback curing body information in time, and sample, sample preparation
The complicated problem of process procedure.In the present invention, fixing device includes fixed support and fixing nut, can adjust the two height and with
The distance of conveyer belt.
As preferred：Described gamma ray generating meanss include gamma ray standard source, biological shielding shell and source collimator,
Described gamma ray standard source is 10mCi60Co isotopic standard body source, for producing the gal of 1.17MeV and 1.33MeV energy
Horse ray；Described source collimator material is lead, is used for making gamma ray project from fan-shaped narrow slit, described biological shielding shell parcel
In gamma ray standard source outer wall, material is lead.
Biological shielding shell material is the purpose of lead is for radiation protection, prevents people and other biological body from excessively being shone
Penetrate.
As preferred：Described gamma-ray detector system includes gamma-ray detector and detector fixed thereon
Collimator, described gamma-ray detector is length and pail for used dressings height identical linear array CMOS gamma-ray detector, described
Detector collimator material is lead.
As preferred：Described analysis process system includes the signal acquiring system being connected with gamma-ray detector, is used for
Obtain the pulse signal matrix of gamma-ray detector output, and be converted to digital signal matrix, that is, the gamma ray after decaying
Intensity matrix；The data handling system being connected with signal acquiring system, for obtaining after the decay that signal acquiring system exports
Gamma ray intensity matrix, and it is converted into average line attenuation coefficient matrix, set up useless according to average line attenuation coefficient matrix
The 2-D gray image of thing bucket scanning survey, and it is contrasted with the image information of qualified radwaste solidified cement body,
If gray value difference is more than preset value it is believed that the porosity of firming body and flaw size are more than allowed band in pail for used dressings, judge
For unqualified, otherwise qualified；The display system being connected with data handling system, for the 2-D gray image of display foundation, admittedly
Change porosity and flaw size information.
In the present invention, analysis process system is made up of signal acquiring system, data handling system and display system three part,
Signal acquiring system is digital signal matrix mainly by the pulse signal matrix conversion that gamma-ray detector exports；At data
Reason system mainly is analyzed processing according to digital signal matrix, judges in pail for used dressings, whether firming body closes in conjunction with preset value
Lattice, are provided reference for feedback control system, by feedback control system, the proportioning raw materials of cement solidification and stir speed (S.S.) are adjusted
Whole, so that follow-up firming body meets solidifying requirements；Display system is mainly used in video data information.
The purpose that digital signal matrix is converted into average line attenuation coefficient matrix is, because pail for used dressings is cylinder, to make
Become the decay thickness of gamma ray in scanning survey different so that after decay gamma ray intensity matrix from centre to edge by
Cumulative strong it is impossible to from rebuilding the information finding out hole and crack two dimensional image.
As preferred：The method that gamma ray intensity matrix conversion after decay is average line attenuation coefficient matrix is：
Attenuation law according to single energy narrow beam gamma ray：
Wherein I is gamma ray intensity after decay, I0For initial gamma transmitted intensity, μmiMass attenuation system for material i
Number, ρiFor the density of material i, diThickness for material i；Assume that each gamma ray is passed through uniform dielectric, density is identical,
Then above formula can be exchanged into：
WhereinIt is the average line attenuation coefficient through medium, D is complete attenuation thickness, according to conveyer belt transfer rate V, give up
Thing bucket radius R and time of measuring t, can obtain starting, from measurement, the complete attenuation thickness D that terminates to measurement, the computing formula of D is:
Simultaneous (2), (3) formula, can obtainComputing formula be：
In formula, initial gamma transmitted intensity I0, transfer rate V, pail for used dressings radius R and time of measuring t be known quantity, root
Average line attenuation coefficient can be obtained according to gamma ray intensity I after decay
By this step, the gamma ray intensity matrix conversion after digital signal matrix, that is, decay is average line
Attenuation quotient matrix, eliminates the different impact of pail for used dressings thickness in measurement process.Carried out using average line attenuation coefficient matrix
Two-dimension image rebuild simultaneously carries out image procossing, by the change of reconstruction image gray value, identifies the hole of firming body in pail for used dressings
Gap and crack.Afterwards, reconstruction image, porosity and crack information are sent to display system 43, show user.
A kind of pail for used dressings medium level waste solidified cement body crack detection method, comprises the following steps：
(1) pail for used dressings equipped with firming body is located on the conveyer belt of motion, and draw near fills through gamma ray
Put and gamma-ray detector, gamma ray generating meanss launch gamma ray to pail for used dressings, and firming body in pail for used dressings is carried out
Scanning；Gamma-ray detector system positioned at gamma ray generating meanss opposite obtains after the decay of pail for used dressings firming body
Gamma ray, and gamma ray is converted to pulse signal sends to analysis process system；
(2) analysis process system obtains the pulse signal of signal acquiring system output, for obtaining pulse signal matrix, place
The 2-D gray image of pail for used dressings scanning survey is set up after reason, and image with qualified radwaste solidified cement body by it
Information contrasts, and judges whether tested pail for used dressings medium level waste solidified cement body is qualified；
(3) if survey pail for used dressings medium level waste solidified cement body is qualified, carry out next measurement, otherwise, feedback control
System processed, according to the information of analysis process system, controls the proportioning of waste liquid, cement and additive and stirring control in matching device
The stir speed (S.S.) of device processed.
As preferred：Described step (1) is specially：
(11) according to pail for used dressings regulation fixing apparatus to be measured, gamma ray generating meanss are made to be located at pail for used dressings middle, from
The gamma ray projecting in fan-shaped narrow slit can be completely covered two summit up and down of pail for used dressings；
(12) conveyer belt uniform motion, the pail for used dressings that will be equipped with radwaste solidified cement body is sent to test position；
(13) gamma ray generating meanss and gamma-ray detector system, the gamma that gamma ray standard source is released are started
Ray projects from the fan-shaped narrow slit of source collimator through source collimator, after firming body decay in pail for used dressings, is visited by gamma ray
Survey device and receive formation pulse signal；
(14) conveyer belt uniform motion, makes pail for used dressings pass through test position completely, completes the scanning survey to pail for used dressings, gal
Horse ray detector recorded gamma ray pulse signal after pail for used dressings decay for the gamma ray, is converted into pulse letter
Number matrix sends to analysis process system.
As preferred：Described step (2) is specially：
(21) signal acquiring system obtains the pulse signal matrix of gamma-ray detector output, and is converted to digital signal
Matrix, that is, the gamma ray intensity matrix after decaying；
(22) data handling system obtain signal acquiring system output decay after gamma ray intensity matrix, and by its
Be converted to average line attenuation coefficient matrix, set up the two dimensional gray figure of pail for used dressings scanning survey according to average line attenuation coefficient matrix
Picture, and image information contrast with qualified radwaste solidified cement body by it, if gray value difference is more than preset value, recognize
Porosity for firming body in pail for used dressings and flaw size are more than allowed band, are judged as unqualified, otherwise qualified；
(23) display system shows 2-D gray image, solidification porosity and the flaw size letter set up through step (22)
Breath.
As preferred：Described step (22) is specially：
The method that gamma ray intensity matrix conversion after decay is average line attenuation coefficient matrix is：
Attenuation law according to single energy narrow beam gamma ray：
Wherein I is gamma ray intensity after decay, I0For initial gamma transmitted intensity, μmiMass attenuation system for material i
Number, ρiFor the density of material i, diThickness for material i；Assume that each gamma ray is passed through uniform dielectric, density is identical,
Then above formula can be exchanged into：
WhereinIt is the average line attenuation coefficient through medium, D is complete attenuation thickness, according to conveyer belt transfer rate V, give up
Thing bucket radius R and time of measuring t, can obtain starting, from measurement, the complete attenuation thickness D that terminates to measurement, the computing formula of D is:
Simultaneous (2), (3) formula, can obtainComputing formula be：
In formula, initial gamma transmitted intensity I0, transfer rate V, pail for used dressings radius R and time of measuring t be known quantity, root
Average line attenuation coefficient can be obtained according to gamma ray intensity I after decay
With it, can be very good using assembly of the invention to the radwaste solidified cement body in pail for used dressings
Gap detected, and judge whether firming body qualified, if surveyed firming body is qualified, continue next pail for used dressings measurement；
If surveyed firming body is unqualified, pail for used dressings can be taken off from conveyer belt and again process by people, adjusted by feedback control system
The stir speed (S.S.) of whole agitating device and the proportioning of proportioning raw materials device.
Compared with prior art, it is an advantage of the current invention that：The gamma ray being produced by gamma ray standard source is to useless
Firming body in thing bucket is scanned, and gamma-ray detector system is obtained gamma after being decayed with firming body interaction and penetrates
Line, is converted to corresponding pulse signal, carries out data processing and two-dimension image rebuild by analysis process system, so that it is determined that solidification
The porosity of body and flaw size, and subsequent cure process is controlled by feedback control system it is ensured that firming body meets solidification
Require, solve the problems, such as the delayed and complicated sampling of firming body chemical detection, sample preparation complex process, and, present invention achieves
Fully-automated synthesis feed back, and decrease the error that anthropic factor leads to.
Brief description
Fig. 1 is the structural representation of the present invention；
Fig. 2 is flow chart of the present invention.
In figure：1st, gamma ray generating meanss；11st, gamma ray standard source；12nd, biological shielding shell；13rd, source collimator；
2nd, gamma-ray detector system；21st, gamma-ray detector；22nd, detector collimator；3rd, fixing device；4th, pail for used dressings；5、
Conveyer belt.
Specific embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Embodiment 1：Referring to Fig. 1, Fig. 2, a kind of pail for used dressings 4 medium level waste solidified cement body crack detecting device, bag
Include conveyer belt 5, for transmitting pail for used dressings 4；
It is arranged on the gamma ray generating meanss 1 of conveyer belt 5 side, for producing gamma ray；Described gamma ray is sent out
Generating apparatus 1 include gamma ray standard source 11, biological shielding shell 12 and source collimator 13, and described gamma ray standard source 11 is
10mCi60Co isotopic standard body source, for producing the gamma ray of 1.17MeV and 1.33MeV energy；Described source collimator 13
Material is lead, is used for making gamma ray project from fan-shaped narrow slit, described biological shielding shell 12 is wrapped in gamma ray standard source
11 outer walls, material is lead；
It is arranged on conveyer belt 5 opposite side, positioned at the gamma-ray detector system 2 on gamma ray generating meanss 1 opposite, use
Gamma ray after detection is produced by gamma ray generating meanss 1, decays through firming body in pail for used dressings 4, and be translated into
Pulse signal matrix；Described gamma-ray detector system 2 includes gamma-ray detector 21 and detector fixed thereon
Collimator 22, described gamma-ray detector 21 is length and pail for used dressings 4 height identical linear array CMOS gamma-ray detector
21, described detector collimator 22 material is lead；
It is arranged on the fixing device 3 of conveyer belt 5 both sides, be used for fixing gamma ray generating meanss 1 and gamma ray detection
Device system 2, can adjust the two height and the distance with conveyer belt 5；
The analysis process system being connected with the outfan of gamma-ray detector system 2, for obtaining pulse signal matrix,
The 2-D gray image of pail for used dressings 4 scanning survey is set up after process, and by itself and qualified radwaste solidified cement body
Image information contrasts, and judges whether tested pail for used dressings 4 medium level waste solidified cement body is qualified；Described analysis process system bag
Include the signal acquiring system being connected with gamma-ray detector 21, for obtaining the pulse signal of gamma-ray detector 21 output
Matrix, and be converted to digital signal matrix, that is, the gamma ray intensity matrix after decaying；The data being connected with signal acquiring system
Processing system, for obtaining the gamma ray intensity matrix after the decay that signal acquiring system exports, and is converted into average
Line attenuation coefficient matrix, sets up the 2-D gray image of pail for used dressings 4 scanning survey according to average line attenuation coefficient matrix, and by its
With the contrast of the image information of qualified radwaste solidified cement body, if gray value difference is more than preset value it is believed that pail for used dressings 4
The porosity of middle firming body and flaw size are more than allowed band, are judged as unqualified, otherwise qualified；With data handling system phase
Display system even, the 2-D gray image set up for display, solidification porosity and flaw size information.Wherein, will decline
Gamma ray intensity matrix conversion after subtracting is that the method for average line attenuation coefficient matrix is：According to single energy narrow beam gamma ray
Attenuation law：
Wherein I is gamma ray intensity after decay, I0For initial gamma transmitted intensity, μmiMass attenuation system for material i
Number, ρiFor the density of material i, diThickness for material i；Assume that each gamma ray is passed through uniform dielectric, density is identical,
Then above formula can be exchanged into：
WhereinIt is the average line attenuation coefficient through medium, D is complete attenuation thickness, according to conveyer belt transfer rate V, give up
Thing bucket radius R and time of measuring t, can obtain starting, from measurement, the complete attenuation thickness D that terminates to measurement, the computing formula of D is:
Simultaneous (2), (3) formula, can obtainComputing formula be：
In formula, initial gamma transmitted intensity I0, transfer rate V, pail for used dressings 4 radius R and time of measuring t be known quantity,
Average line attenuation coefficient can be obtained according to gamma ray intensity I after decay
The feedback control system being connected with the outfan of analysis process system, described feedback control system connects Spent Radioactive
The matching device of thing solidified cement body and mixing control device, according to the information of analysis process system, control waste liquid in matching device,
The proportioning of cement and additive and the stir speed (S.S.) of mixing control device.
A kind of pail for used dressings 4 medium level waste solidified cement body crack detection method, comprises the following steps：
(1) pail for used dressings 4 equipped with firming body is located on the conveyer belt 5 of motion, and draw near occurs through gamma ray
Device 1 and gamma-ray detector 21, gamma ray generating meanss 1 launch gamma ray to pail for used dressings 4, to solid in pail for used dressings 4
Change body to be scanned；Gamma-ray detector system 2 positioned at gamma ray generating meanss 1 opposite obtains solid through pail for used dressings 4
Change the gamma ray after asthenia subtracts, and gamma ray is converted to pulse signal and send to analysis process system；Described step (1)
It is specially：
(11) according to pail for used dressings 4 regulation fixing apparatus 3 to be measured, gamma ray generating meanss 1 are made to hit exactly positioned at pail for used dressings 4
Between, the gamma ray projecting from fan-shaped narrow slit can be completely covered two summit up and down of pail for used dressings 4；
(12) conveyer belt 5 uniform motion, the pail for used dressings 4 that will be equipped with radwaste solidified cement body is sent to test position；
(13) gamma ray generating meanss 1 and gamma-ray detector system 2 are started, gamma ray standard source 11 is released
Gamma ray projects from the fan-shaped narrow slit of source collimator 13 through source collimator 13, after firming body decay in pail for used dressings 4, by gal
Horse ray detector 21 receives and forms pulse signal；
(14) conveyer belt 5 uniform motion, makes pail for used dressings 4 pass through test position completely, completes the scanning to pail for used dressings 4 and survey
Amount, gamma-ray detector 21 recorded gamma ray pulse signal after pail for used dressings 4 decay for the gamma ray, is converted
Send to analysis process system for pulse signal matrix；
(2) analysis process system obtains the pulse signal of signal acquiring system output, for obtaining pulse signal matrix, place
The 2-D gray image of pail for used dressings 4 scanning survey is set up after reason, and figure with qualified radwaste solidified cement body by it
As information contrast, judge whether tested pail for used dressings 4 medium level waste solidified cement body is qualified；Described step (2) is specially：
(21) signal acquiring system obtains the pulse signal matrix of gamma-ray detector 21 output, and is converted to numeral letter
Number matrix, that is, the gamma ray intensity matrix after decaying；
(22) data handling system obtain signal acquiring system output decay after gamma ray intensity matrix, and by its
Be converted to average line attenuation coefficient matrix, set up the two dimensional gray of pail for used dressings 4 scanning survey according to average line attenuation coefficient matrix
Image, and image information contrast with qualified radwaste solidified cement body by it, if gray value difference is more than preset value,
Think that in pail for used dressings 4, the porosity of firming body and flaw size are more than allowed band, be judged as unqualified, otherwise qualified；
(23) display system shows 2-D gray image, solidification porosity and the flaw size letter set up through step (22)
Breath.
Described step (22) is specially：
After decaying, gamma ray intensity matrix conversion is average line attenuation coefficient matrix, and method is：
Attenuation law according to single energy narrow beam gamma ray：
Wherein I is gamma ray intensity after decay, I0For initial gamma transmitted intensity, μmiMass attenuation system for material i
Number, ρiFor the density of material i, diThickness for material i；Assume that each gamma ray is passed through uniform dielectric, density is identical,
Then above formula can be exchanged into：
WhereinIt is the average line attenuation coefficient through medium, D is complete attenuation thickness, according to conveyer belt transfer rate V, give up
Thing bucket radius R and time of measuring t, can obtain starting, from measurement, the complete attenuation thickness D that terminates to measurement, the computing formula of D is:
Simultaneous (2), (3) formula, can obtainComputing formula be：
In formula, initial gamma transmitted intensity I0, transfer rate V, pail for used dressings 4 radius R and time of measuring t be known quantity,
Average line attenuation coefficient can be obtained according to gamma ray intensity I after decay
(3) if survey pail for used dressings 4 medium level waste solidified cement body is qualified, carry out next measurement, otherwise, feedback control
System processed, according to the information of analysis process system, controls the proportioning of waste liquid, cement and additive and stirring control in matching device
The stir speed (S.S.) of device processed.
In fact, feedback control system is controlled according to the information of analysis process system.Described analysis process system
Information it is simply that above-mentioned judgement firming body is qualified, underproof information.If it is qualified that analysis process system is judged as, feedback control
System processed does not carry out any operation, and apparatus of the present invention carry out the scanning of next pail for used dressings 4, if judging the pail for used dressings of current detection
4 is unqualified, then need to be adjusted by feedback control system.
Certainly, because analysis process system has analyzed result, people can according to result and the actual demand of oneself,
Carry out actual adjustment, the present invention provides a kind of scheme of adjustment as follows：
Through many experiments, we have concluded that a relational expression is as follows：
Wherein D is porosity and flaw size, and M is waste liquid, cement, the amount (three mixes by a certain percentage) of additive, V
For stir speed (S.S.), T is mixing time, and N is hole " porosity and flaw size " and " waste liquid, cement, additive, stir speed (S.S.) and stir
Mix the time " empirical coefficient of founding mathematical models, draw through many experiments.
Currently N, M, V, T of tested pail for used dressings 4 be known, then we can draw the value of D, this value and analyzing and processing
In system there is corresponding relation in gray value differences, and gray value differences are big, and D value is big, and preset value can preset qualified gray value differences and D
Value.
If judging, firming body is unqualified, need to be handled as follows by feedback control system：
(1) increase stir speed (S.S.) and mixing time, then measure, if qualified, terminate；If unqualified, proceed to second step.
(2) stir after increasing a small amount of cement, water and additive, then measure, if qualified, terminate；If unqualified, proceed to
1 step.
Certainly people can be with the value of analysis process system, by oneself it needs to be determined that Adjusted Option, not necessarily according to this enforcement
The method that example provides.
Claims (6)
1. a kind of pail for used dressings medium level waste solidified cement body crack detecting device it is characterised in that：
Including conveyer belt, for transmitting pail for used dressings；
It is arranged on the gamma ray generating meanss of conveyer belt side, for producing gamma ray；
It is arranged on conveyer belt opposite side, positioned at the gamma-ray detector system on gamma ray generating meanss opposite, for detecting
By the generation of gamma ray generating meanss, the gamma ray after firming body decay in pail for used dressings, and it is translated into pulse signal
Matrix；
It is arranged on the fixing device of conveyer belt both sides, be used for fixing gamma ray generating meanss and gamma-ray detector system,
The two height and the distance with conveyer belt can be adjusted；
The analysis process system being connected with the outfan of gamma-ray detector system, for obtaining pulse signal matrix, is processed
Set up the 2-D gray image of pail for used dressings scanning survey afterwards, and image letter with qualified radwaste solidified cement body by it
Breath contrast, judges whether tested pail for used dressings medium level waste solidified cement body is qualified；
The feedback control system being connected with the outfan of analysis process system, described feedback control system connects radwaste water
The matching device of mud firming body and mixing control device, according to the information of analysis process system, control waste liquid, cement in matching device
With the proportioning of additive and the stir speed (S.S.) of mixing control device；
Described analysis process system includes
The signal acquiring system being connected with gamma-ray detector, for obtaining the pulse signal square of gamma-ray detector output
Battle array, and be converted to digital signal matrix, that is, the gamma ray intensity matrix after decaying；
The data handling system being connected with signal acquiring system, the gamma for obtaining after the decay that signal acquiring system exports is penetrated
Line strength matrix, and it is converted into average line attenuation coefficient matrix, pail for used dressings is set up according to average line attenuation coefficient matrix and sweeps
Retouch the 2-D gray image of measurement, and image information contrast with qualified radwaste solidified cement body by it, if gray scale
Value difference not great Yu preset value it is believed that in pail for used dressings the porosity of firming body and flaw size be more than allowed band, be judged as not conforming to
Lattice are otherwise qualified；
The display system being connected with data handling system, for showing the 2-D gray image set up, solidification porosity and splitting
Seam dimension information.
2. pail for used dressings medium level waste solidified cement body crack detecting device according to claim 1 it is characterised in that：
Described gamma ray generating meanss include gamma ray standard source, biological shielding shell and source collimator, described gamma ray standard
Source is 10mCi60Co isotopic standard body source, for producing the gamma ray of 1.17MeV and 1.33MeV energy；Described source collimation
Equipment material is lead, is used for making gamma ray project from fan-shaped narrow slit, described biological shielding shell is wrapped in gamma ray standard source
Outer wall, material is lead.
3. pail for used dressings medium level waste solidified cement body crack detecting device according to claim 1 it is characterised in that：
Described gamma-ray detector system includes gamma-ray detector and detector collimator fixed thereon, and described gamma is penetrated
Line detector is length and pail for used dressings height identical linear array CMOS gamma-ray detector, and described detector collimator material is
Lead.
4. pail for used dressings medium level waste solidified cement body crack detecting device according to claim 1 it is characterised in that：
The method that gamma ray intensity matrix conversion after decay is average line attenuation coefficient matrix is：
Attenuation law according to single energy narrow beam gamma ray：
Wherein I is gamma ray intensity after decay, I0For initial gamma transmitted intensity, μmiFor the mass attentuation coefficient of material i, ρi
For the density of material i, diThickness for material i；Assume that each gamma ray is passed through uniform dielectric, density is identical, then go up
Formula can be exchanged into：
WhereinIt is the average line attenuation coefficient through medium, D is complete attenuation thickness, according to conveyer belt transfer rate V, pail for used dressings
Radius R and time of measuring t, can obtain starting, from measurement, the complete attenuation thickness D that terminates to measurement, the computing formula of D is:
Simultaneous (2), (3) formula, can obtainComputing formula be：
In formula, initial gamma transmitted intensity I0, transfer rate V, pail for used dressings radius R and time of measuring t be known quantity, according to declining
Subtract rear gamma ray intensity I and can obtain average line attenuation coefficient
5. a kind of pail for used dressings medium level waste solidified cement body crack detection method it is characterised in that：Comprise the following steps：
(1) pail for used dressings equipped with firming body is located on the conveyer belt of motion, draw near through gamma ray generating meanss and
Gamma-ray detector, gamma ray generating meanss launch gamma ray to pail for used dressings, and firming body in pail for used dressings is scanned；
Gamma-ray detector system positioned at gamma ray generating meanss opposite obtains the gamma after the decay of pail for used dressings firming body
Ray, and gamma ray is converted to pulse signal sends to analysis process system；
(2) analysis process system obtains the pulse signal of signal acquiring system output, for obtaining pulse signal matrix, after process
Set up the 2-D gray image of pail for used dressings scanning survey, and image information with qualified radwaste solidified cement body by it
Contrast, judges whether tested pail for used dressings medium level waste solidified cement body is qualified；
(3) if survey pail for used dressings medium level waste solidified cement body is qualified, next measurement, otherwise, feedback control system are carried out
System, according to the information of analysis process system, controls the proportioning of waste liquid, cement and additive and mixing control device in matching device
Stir speed (S.S.)；
Described step (1) is specially：
(11) according to pail for used dressings regulation fixing apparatus to be measured, gamma ray generating meanss are made to be located at pail for used dressings middle, from sector
The gamma ray projecting in narrow slit can be completely covered two summit up and down of pail for used dressings；
(12) conveyer belt uniform motion, the pail for used dressings that will be equipped with radwaste solidified cement body is sent to test position；
(13) gamma ray generating meanss and gamma-ray detector system, the gamma ray that gamma ray standard source is released are started
Project from the fan-shaped narrow slit of source collimator through source collimator, after firming body decay in pail for used dressings, by gamma-ray detector
Receive and form pulse signal；
(14) conveyer belt uniform motion, makes pail for used dressings pass through test position completely, completes the scanning survey to pail for used dressings, gamma is penetrated
Line detector recorded gamma ray pulse signal after pail for used dressings decay for the gamma ray, is converted into pulse signal square
Analysis process system is delivered in paroxysm；
Described step (2) is specially：
(21) signal acquiring system obtains the pulse signal matrix of gamma-ray detector output, and is converted to digital signal square
Battle array, that is, the gamma ray intensity matrix after decaying；
(22) data handling system obtains the gamma ray intensity matrix after the decay of signal acquiring system output, and is converted
For average line attenuation coefficient matrix, set up the 2-D gray image of pail for used dressings scanning survey according to average line attenuation coefficient matrix,
And image information contrast with qualified radwaste solidified cement body by it, if gray value difference be more than preset value it is believed that
In pail for used dressings, the porosity of firming body and flaw size are more than allowed band, are judged as unqualified, otherwise qualified；
(23) display system shows 2-D gray image, solidification porosity and the flaw size information set up through step (22).
6. pail for used dressings medium level waste solidified cement body crack detection method according to claim 5 it is characterised in that：
Described step (22) is specially：
After decaying, gamma ray intensity matrix conversion is average line attenuation coefficient matrix, and method is：
Attenuation law according to single energy narrow beam gamma ray：
Wherein I is gamma ray intensity after decay, I0For initial gamma transmitted intensity, μmiFor the mass attentuation coefficient of material i, ρi
For the density of material i, diThickness for material i；Assume that each gamma ray is passed through uniform dielectric, density is identical, then go up
Formula can be exchanged into：
WhereinIt is the average line attenuation coefficient through medium, D is complete attenuation thickness, according to conveyer belt transfer rate V, pail for used dressings
Radius R and time of measuring t, can obtain starting, from measurement, the complete attenuation thickness D that terminates to measurement, the computing formula of D is:
Simultaneous (2), (3) formula, can obtainComputing formula be：
In formula, initial gamma transmitted intensity I0, transfer rate V, pail for used dressings radius R and time of measuring t be known quantity, according to declining
Subtract rear gamma ray intensity I and can obtain average line attenuation coefficient
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| CN110702707A (en) * | 2019-10-16 | 2020-01-17 | 四川轻化工大学 | Method for obtaining nuclear waste barrel chromatography gamma scanning image |
| CN111708071B (en) * | 2020-06-05 | 2022-08-05 | 成都理工大学 | Nuclear waste packaging body assembly line type scanning detection device |
| CN111638235B (en) * | 2020-07-10 | 2023-06-20 | 成都理工大学 | XACT-based radioactive waste solidification structure detection method |
| CN114637051A (en) * | 2022-03-22 | 2022-06-17 | 四川轻化工大学 | Waste barrel segmented gamma measuring device and method based on tellurium-zinc-cadmium array detection |
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