CN104569006A - Device and method for detecting cracks of radioactive waste cement solidified body in waste drum - Google Patents

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

Pail for used dressings medium level waste solidified cement body crack detecting device and method

Technical field

The present invention relates to a kind of radioactive waste solidified cement body detection system, particularly relate to a kind of pail for used dressings medium level waste solidified cement body crack detecting device and method.

Background technology

Radioactive waste cement solidification is using cement as main inorganic gel materials, mix the composite material of pozzolanic activity, improve additive and the fiber of mix slurry and some performance of Behavior of Hardened Cement Paste, add water, mix with refuse according to a certain ratio, utilize the hydraulicity of cement and composite material, make mix slurry after certain curing period, form the firming body with some strength and permanance.Because of its have treatment process simple, be widely used the Radwastes treatment in nuclear power station and other nuclear facilities without the need to features such as high temperature, cured product good stability, cost are low.But in preparation process, the proportioning of waste liquid, cement and adjuvant is improper or stirring uneven meeting makes firming body form multiple hole and crack, thus cause the adverse effects such as the rising of nucleic leaching rate, compressive strength reduction, make firming body not meet solidifying requirements.

At present, firming body inspection is main adopts traditional chemical analysis means, is obtained the indices such as leachability, compressive strength of firming body by too many levels such as sampling, sample preparation, chemical examinations.But this traditional mode needs the longer time, can not feedback curing body information in time; And firming body is encapsulated in mixed earth bucket or steel drum with solid-state form, need complicated sampling, sample preparation process procedure.

Summary of the invention

Object of the present invention is just to provide one to solve the problem, and passing hole porosity and crack infer whether firming body meets solidifying requirements, thus carries out feedback regulation to the proportioning of waste liquid, cement and adjuvant and stir speed (S.S.).Can detect in real time firming body, solve can not timely feedback curing body information and sampling, the pail for used dressings medium level waste solidified cement body crack detecting device of problem of sample preparation process procedure complexity 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, is characterized in that:

Comprise travelling belt, for transmitting pail for used dressings;

Be arranged on the gamma ray generating means of travelling belt side, for generation of gamma ray;

Being arranged on travelling belt opposite side, being positioned at the gamma-ray detector system on gamma ray generating means opposite, being produced by gamma ray generating means for detecting, gamma ray after firming body in pail for used dressings is decayed, and be translated into pulse signal matrix;

Be arranged on the stationary installation of travelling belt both sides, for fixing gamma ray generating means and gamma-ray detector system, height both regulating and the distance with travelling belt;

The analysis process system be connected with the output terminal 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 the image information of itself and qualified radioactive waste solidified cement body is contrasted, judge that whether tested pail for used dressings medium level waste solidified cement body is qualified;

The feedback control system be connected with the output terminal of analysis process system, described feedback control system connects matching device and the mixing control device of radioactive waste solidified cement body, according to the information of analysis process system, control the proportioning of waste liquid, cement and adjuvant and the stir speed (S.S.) of mixing control device in matching device.

In the present invention, travelling belt transmits pail for used dressings to be detected, gamma ray generating means produces gamma ray, after firming body decay in pail for used dressings, arrived by gamma-ray detector system looks, and be converted into pulse signal matrix, after disposal system processes by analysis, judge that whether tested pail for used dressings medium level waste solidified cement body is qualified; If defective, then control the proportioning of waste liquid, cement and adjuvant and the stir speed (S.S.) of mixing control device in matching device by feedback control system, qualified, do not do any operation.The present invention can detection of radioactive refuse solidified cement body in preparation process, the proportioning of waste liquid, cement and adjuvant is improper or stir the uneven hole that causes and crack, thus adjust the proportioning of stir speed (S.S.) and waste liquid, cement and adjuvant in time, avoid in traditional approach, the indices such as leachability, compressive strength of firming body is obtained by too many levels such as sampling, sample preparation, chemical examinations, thus cause detection time long, can not feedback curing body information in time, and the problem of sampling, sample preparation process procedure complexity.In the present invention, stationary installation comprises fixed support and hold-down nut, height both regulating and the distance with travelling belt.

As preferably: described gamma ray generating means comprises gamma ray standard source, biological shielding shell and source collimating apparatus, and described gamma ray standard source is 10mCi ⁶⁰co isotopic standard body source, for generation of the gamma ray of 1.17MeV and 1.33MeV energy; Described source collimator material is plumbous, and for making gamma ray penetrate from fan-shaped narrow slit, described biological shielding shell is wrapped in gamma ray standard source outer wall, and material is plumbous.

Biological shielding shell material is plumbous object is for radiation protection, prevents people and other biological body to be subject to excessive exposure.

As preferably: described gamma-ray detector system comprises gamma-ray detector and detector collimating apparatus fixed thereon, described gamma-ray detector is the linear array CMOS gamma-ray detector that length is identical with pail for used dressings height, and described detector collimator material is plumbous.

As preferably: described analysis process system comprises the signal acquiring system be connected with gamma-ray detector, for obtaining the pulse signal matrix that gamma-ray detector exports, and be converted to digital signal matrix, the gamma ray intensity matrix namely after decay; The data handling system be connected with signal acquiring system, for obtain signal acquiring system export decay after gamma ray intensity matrix, and be converted into average line attenuation coefficient matrix, the 2-D gray image of pail for used dressings scanning survey is set up according to average line attenuation coefficient matrix, and the image information of itself and qualified radioactive waste solidified cement body is contrasted, if gray-scale value difference is greater than preset value, think that the factor of porosity of firming body in pail for used dressings and flaw size are greater than allowed band, be judged as defective, otherwise qualified; The display system be connected with data handling system, for showing the 2-D gray image of foundation, firming body factor of porosity and flaw size information.

In the present invention, analysis process system by signal acquiring system, data handling system and display system three part form, signal acquiring system mainly by gamma-ray detector export pulse signal matrix conversion be digital signal matrix; Data handling system mainly carries out analyzing and processing according to digital signal matrix, judge that in pail for used dressings, whether firming body is qualified in conjunction with preset value, for feedback control system provides reference, by feedback control system, the pulp furnish of cement solidification and stir speed (S.S.) are adjusted, meet solidifying requirements to make follow-up firming body; Display system is mainly used in showing data message.

Object digital signal matrix being converted into average line attenuation coefficient matrix is, because pail for used dressings is right cylinder, cause the decay thickness of the gamma ray when scanning survey different, after making to decay, gamma ray intensity matrix strengthens gradually from centre to edge, cannot from rebuilding the information finding out hole and crack two dimensional image.

As preferably: the method being average line attenuation coefficient matrix by the gamma ray intensity matrix conversion after decay is: the attenuation law according to monoenergetic narrow beam gamma ray:

$I=I_0{\mathrm{ge}}^{-\underset{i}{\mathrm{\Σ}}{\mathrm{\μ}}_{\mathrm{mi}}g{\mathrm{\ρ}}_{i}g{d}_i}---\left(1\right)$

Wherein I is gamma ray intensity after decay, I ₀for initial gamma transmitted intensity, μ _mifor the mass attenuation coefficient of material i, ρ _ifor the density of material i, d _ifor the thickness of material i.What suppose that each gamma ray passes is uniform dielectric, and density is identical, then above formula can be exchanged into:

$I=I_0{\mathrm{ge}}^{\stackrel{\‾}{\mathrm{\μ}}\mathrm{gD}}---\left(2\right)$

Wherein for the average line attenuation coefficient through medium, D is overall attenuation thickness.According to travelling belt 7 transfer rate V, pail for used dressings radius R and measurement time t, can obtain terminating to measurement from measurement, the computing formula of D is:

$D=2\sqrt{R^2-{(R-\mathrm{Vgt})}^2}---\left(3\right)$

Simultaneous (2), (3) formula, can obtain computing formula be:

$\stackrel{\‾}{\mathrm{\μ}}=\frac{\mathrm{In}{I}_0/I}{2\sqrt{R^2-{(R-\mathrm{Vgt})}^2}}---\left(4\right)$

In formula, initial gamma transmitted intensity I ₀, transfer rate V, pail for used dressings radius R and measurement time t be known quantity, can obtain average line attenuation coefficient according to gamma ray intensity I after decay

By this step, by digital signal matrix, the gamma ray intensity matrix conversion namely after decay is average line attenuation coefficient matrix, eliminates the impact that in measuring process, pail for used dressings thickness is different.Utilizing average line attenuation coefficient matrix carry out two-dimension image rebuild and carry out image procossing, by rebuilding the change of image intensity value, picking out hole and the crack of firming body in pail for used dressings.Afterwards, reconstruction image, factor of 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 that firming body is housed is positioned on the travelling belt of motion, draw near through gamma ray generating means and gamma-ray detector, gamma ray generating means launches gamma ray to pail for used dressings, scans firming body in pail for used dressings; The gamma-ray detector system being positioned at gamma ray generating means opposite obtains the gamma ray after the decay of pail for used dressings firming body, and gamma ray is converted to pulse signal is sent to analysis process system;

(2) analysis process system obtains the pulse signal that signal acquiring system exports, for obtaining pulse signal matrix, the 2-D gray image of pail for used dressings scanning survey is set up after process, and the image information of itself and qualified radioactive waste solidified cement body is contrasted, judge that whether tested pail for used dressings medium level waste solidified cement body is qualified;

(3) qualified if survey pail for used dressings medium level waste solidified cement body, then carry out the next one to measure, otherwise feedback control system, according to the information of analysis process system, controls the proportioning of waste liquid, cement and adjuvant and the stir speed (S.S.) of mixing control device in matching device.

As preferably: described step (1) is specially:

(11) according to pail for used dressings regulation fixing apparatus to be measured, make gamma ray generating means be positioned at pail for used dressings middle, the gamma ray penetrated from fan-shaped narrow slit can cover two summits up and down of pail for used dressings completely;

(12) travelling belt uniform motion, sends to the pail for used dressings that radioactive waste solidified cement body is housed and detects position;

(13) gamma ray generating means and gamma-ray detector system is started, the gamma ray that gamma ray standard source is released is through the fan-shaped narrow slit injection of source collimating apparatus from source collimating apparatus, after firming body decay in pail for used dressings, received by gamma-ray detector and form pulse signal;

(14) travelling belt uniform motion, make pail for used dressings completely by detecting position, complete the scanning survey to pail for used dressings, gamma-ray detector is recorded to the gamma ray pulse signal of gamma ray after pail for used dressings decay, is converted into pulse signal matrix and is sent to analysis process system.

As preferably: described step (2) is specially:

(21) signal acquiring system obtains the pulse signal matrix that gamma-ray detector exports, and is converted to digital signal matrix, the gamma ray intensity matrix namely after decay;

(22) data handling system obtain signal acquiring system export decay after gamma ray intensity matrix, and be converted into average line attenuation coefficient matrix, the 2-D gray image of pail for used dressings scanning survey is set up according to average line attenuation coefficient matrix, and the image information of itself and qualified radioactive waste solidified cement body is contrasted, if gray-scale value difference is greater than preset value, think that the factor of porosity of firming body in pail for used dressings and flaw size are greater than allowed band, be judged as defective, otherwise qualified;

(23) display system shows 2-D gray image, firming body factor of porosity and the flaw size information set up through step (22).

As preferably: described step (22) is specially:

Be average line attenuation coefficient matrix by gamma ray intensity matrix conversion after decay, method is: the attenuation law according to monoenergetic narrow beam gamma ray:

$I=I_0{\mathrm{ge}}^{-\underset{i}{\mathrm{\Σ}}{\mathrm{\μ}}_{\mathrm{mi}}g{\mathrm{\ρ}}_{i}g{d}_i}---\left(1\right)$

Wherein I is gamma ray intensity after decay, I ₀for initial gamma transmitted intensity, μ _mifor the mass attenuation coefficient of material i, ρ _ifor the density of material i, d _ifor the thickness of material i.What suppose that each gamma ray passes is uniform dielectric, and density is identical, then above formula can be exchanged into:

$I=I_0{\mathrm{ge}}^{\stackrel{\‾}{\mathrm{\μ}}\mathrm{gD}}---\left(2\right)$

Wherein for the average line attenuation coefficient through medium, D is overall attenuation thickness.According to travelling belt 7 transfer rate V, pail for used dressings radius R and measurement time t, can obtain terminating to measurement from measurement, the computing formula of D is:

$D=2\sqrt{R^2-{(R-\mathrm{Vgt})}^2}---\left(3\right)$

Simultaneous (2), (3) formula, can obtain computing formula be:

$\stackrel{\‾}{\mathrm{\μ}}=\frac{\mathrm{In}{I}_0/I}{2\sqrt{R^2-{(R-\mathrm{Vgt})}^2}}---\left(4\right)$

In formula, initial gamma transmitted intensity I ₀, transfer rate V, pail for used dressings radius R and measurement time t be known quantity, can obtain average line attenuation coefficient according to gamma ray intensity I after decay

By the method, the gap of device of the present invention to the radioactive waste solidified cement body in pail for used dressings can well be utilized to detect, and judge that whether firming body qualified, if to survey firming body qualified, then continue next pail for used dressings and measure; If to survey firming body defective, pail for used dressings can take off from travelling belt and again process by people, by the feedback control system adjustment stir speed (S.S.) of stirring apparatus and the proportioning of pulp furnish device.

Compared with prior art, the invention has the advantages that: the gamma ray produced by gamma ray standard source is scanned the firming body in pail for used dressings, gamma-ray detector system obtains and firming body interacts there is rear gamma ray of decaying, be converted to corresponding pulse signal, data processing and two-dimension image rebuild is carried out by analysis process system, thus determine factor of porosity and the flaw size of firming body, and control subsequent cure process by feedback control system, ensure that firming body meets solidifying requirements, solve the delayed and complicated sampling of firming body chemical detection, the problem of sample preparation complex process, and, present invention achieves fully-automated synthesis feedback, decrease the error that human factor causes.

Accompanying drawing explanation

Fig. 1 is structural representation of the present invention;

Fig. 2 is process flow diagram of the present invention.

In figure: 1, gamma ray generating means; 11, gamma ray standard source; 12, biological shielding shell; 13, source collimating apparatus; 2, gamma-ray detector system; 21, gamma-ray detector; 22, detector collimating apparatus; 3, stationary installation; 4, pail for used dressings; 5, travelling belt.

Embodiment

Below in conjunction with accompanying drawing, the invention will be further described.

Embodiment 1: see Fig. 1, Fig. 2, a kind of pail for used dressings 4 medium level waste solidified cement body crack detecting device, comprises travelling belt 5, for transmitting pail for used dressings 4;

Be arranged on the gamma ray generating means 1 of travelling belt 5 side, for generation of gamma ray; Described gamma ray generating means 1 comprises gamma ray standard source 11, biological shielding shell 12 and source collimating apparatus 13, and described gamma ray standard source 11 is 10mCi ⁶⁰co isotopic standard body source, for generation of the gamma ray of 1.17MeV and 1.33MeV energy; Described source collimating apparatus 13 material is plumbous, and for making gamma ray penetrate from fan-shaped narrow slit, described biological shielding shell 12 is wrapped in gamma ray standard source 11 outer wall, and material is plumbous;

Be arranged on travelling belt 5 opposite side, be positioned at the gamma-ray detector system 2 on gamma ray generating means 1 opposite, produced by gamma ray generating means 1 for detecting, gamma ray after firming body decay in pail for used dressings 4, and be translated into pulse signal matrix; Described gamma-ray detector system 2 comprises gamma-ray detector 21 and detector collimating apparatus 22 fixed thereon, described gamma-ray detector 21 is the linear array CMOS gamma-ray detector 21 that length is highly identical with pail for used dressings 4, and described detector collimating apparatus 22 material is plumbous;

Be arranged on the stationary installation 3 of travelling belt 5 both sides, for fixing gamma ray generating means 1 and gamma-ray detector system 2, height both regulating and the distance with travelling belt 5;

The analysis process system be connected with the output terminal 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 the image information of itself and qualified radioactive waste solidified cement body is contrasted, judge that whether tested pail for used dressings 4 medium level waste solidified cement body is qualified; Described analysis process system comprises the signal acquiring system be connected with gamma-ray detector 21, for obtaining the pulse signal matrix that gamma-ray detector 21 exports, and is converted to digital signal matrix, the gamma ray intensity matrix namely after decay; The data handling system be connected with signal acquiring system, for obtain signal acquiring system export decay after gamma ray intensity matrix, and be converted into average line attenuation coefficient matrix, the 2-D gray image of pail for used dressings 4 scanning survey is set up according to average line attenuation coefficient matrix, and the image information of itself and qualified radioactive waste solidified cement body is contrasted, if gray-scale value difference is greater than preset value, think that the factor of porosity of firming body in pail for used dressings 4 and flaw size are greater than allowed band, be judged as defective, otherwise qualified; The display system be connected with data handling system, for showing the 2-D gray image of foundation, firming body factor of porosity and flaw size information.Wherein, the method being average line attenuation coefficient matrix by the gamma ray intensity matrix conversion after decay is: the attenuation law according to monoenergetic narrow beam gamma ray:

$I=I_0{\mathrm{ge}}^{-\underset{i}{\mathrm{\Σ}}{\mathrm{\μ}}_{\mathrm{mi}}g{\mathrm{\ρ}}_{i}g{d}_i}---\left(1\right)$

Wherein I is gamma ray intensity after decay, I ₀for initial gamma transmitted intensity, μ _mifor the mass attenuation coefficient of material i, ρ _ifor the density of material i, d _ifor the thickness of material i.What suppose that each gamma ray passes is uniform dielectric, and density is identical, then above formula can be exchanged into:

$I=I_0{\mathrm{ge}}^{\stackrel{\‾}{\mathrm{\μ}}\mathrm{gD}}---\left(2\right)$

Wherein for the average line attenuation coefficient through medium, D is overall attenuation thickness.According to travelling belt 57 transfer rate V, pail for used dressings 4 radius R and measurement time t, can obtain terminating to measurement from measurement, the computing formula of D is:

$D=2\sqrt{R^2-{(R-\mathrm{Vgt})}^2}---\left(3\right)$

Simultaneous (2), (3) formula, can obtain computing formula be:

$\stackrel{\‾}{\mathrm{\μ}}=\frac{\mathrm{In}{I}_0/I}{2\sqrt{R^2-{(R-\mathrm{Vgt})}^2}}---\left(4\right)$

In formula, initial gamma transmitted intensity I ₀, transfer rate V, pail for used dressings 4 radius R and measurement time t be known quantity, can obtain average line attenuation coefficient according to gamma ray intensity I after decay

The feedback control system be connected with the output terminal of analysis process system, described feedback control system connects matching device and the mixing control device of radioactive waste solidified cement body, according to the information of analysis process system, control the proportioning of waste liquid, cement and adjuvant and the stir speed (S.S.) of mixing control device in matching 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 that firming body is housed is positioned on the travelling belt 5 of motion, draw near through gamma ray generating means 1 and gamma-ray detector 21, gamma ray generating means 1 launches gamma ray to pail for used dressings 4, scans firming body in pail for used dressings 4; The gamma-ray detector system 2 being positioned at gamma ray generating means 1 opposite obtains the gamma ray after the decay of pail for used dressings 4 firming body, and gamma ray is converted to pulse signal is sent to analysis process system; Described step (1) is specially:

(11) according to pail for used dressings 4 regulation fixing apparatus 3 to be measured, make gamma ray generating means 1 be positioned at pail for used dressings 4 middle, the gamma ray penetrated from fan-shaped narrow slit can cover two summits up and down of pail for used dressings 4 completely;

(12) travelling belt 5 uniform motion, sends to the pail for used dressings 4 that radioactive waste solidified cement body is housed and detects position;

(13) gamma ray generating means 1 and gamma-ray detector system 2 is started, the gamma ray that gamma ray standard source 11 is released is through the fan-shaped narrow slit injection of source collimating apparatus 13 from source collimating apparatus 13, after firming body decay in pail for used dressings 4, received formation pulse signal by gamma-ray detector 21;

(14) travelling belt 5 uniform motion, make pail for used dressings 4 completely by detecting position, complete the scanning survey to pail for used dressings 4, gamma-ray detector 21 is recorded to the gamma ray pulse signal of gamma ray after pail for used dressings 4 is decayed, and is converted into pulse signal matrix and is sent to analysis process system;

(2) analysis process system obtains the pulse signal that signal acquiring system exports, for obtaining pulse signal matrix, the 2-D gray image of pail for used dressings 4 scanning survey is set up after process, and the image information of itself and qualified radioactive waste solidified cement body is contrasted, judge that 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 that gamma-ray detector 21 exports, and is converted to digital signal matrix, the gamma ray intensity matrix namely after decay;

(22) data handling system obtain signal acquiring system export decay after gamma ray intensity matrix, and be converted into average line attenuation coefficient matrix, the 2-D gray image of pail for used dressings 4 scanning survey is set up according to average line attenuation coefficient matrix, and the image information of itself and qualified radioactive waste solidified cement body is contrasted, if gray-scale value difference is greater than preset value, think that the factor of porosity of firming body in pail for used dressings 4 and flaw size are greater than allowed band, be judged as defective, otherwise qualified;

(23) display system shows 2-D gray image, firming body factor of porosity and the flaw size information set up through step (22).

Described step (22) is specially:

Be average line attenuation coefficient matrix by gamma ray intensity matrix conversion after decay, method is: the attenuation law according to monoenergetic narrow beam gamma ray:

$I=I_0{\mathrm{ge}}^{-\underset{i}{\mathrm{\Σ}}{\mathrm{\μ}}_{\mathrm{mi}}g{\mathrm{\ρ}}_{i}g{d}_i}---\left(1\right)$

Wherein I is gamma ray intensity after decay, I ₀for initial gamma transmitted intensity, μ _mifor the mass attenuation coefficient of material i, ρ _ifor the density of material i, d _ifor the thickness of material i.What suppose that each gamma ray passes is uniform dielectric, and density is identical, then above formula can be exchanged into:

$I=I_0{\mathrm{ge}}^{\stackrel{\‾}{\mathrm{\μ}}\mathrm{gD}}---\left(2\right)$

Wherein for the average line attenuation coefficient through medium, D is overall attenuation thickness.According to travelling belt 57 transfer rate V, pail for used dressings 4 radius R and measurement time t, can obtain terminating to measurement from measurement, the computing formula of D is:

$D=2\sqrt{R^2-{(R-\mathrm{Vgt})}^2}---\left(3\right)$

Simultaneous (2), (3) formula, can obtain computing formula be:

$\stackrel{\‾}{\mathrm{\μ}}=\frac{\mathrm{In}{I}_0/I}{2\sqrt{R^2-{(R-\mathrm{Vgt})}^2}}---\left(4\right)$

In formula, initial gamma transmitted intensity I ₀, transfer rate V, pail for used dressings 4 radius R and measurement time t be known quantity, can obtain average line attenuation coefficient according to gamma ray intensity I after decay

(3) qualified if survey pail for used dressings 4 medium level waste solidified cement body, then carry out the next one to measure, otherwise feedback control system, according to the information of analysis process system, controls the proportioning of waste liquid, cement and adjuvant and the stir speed (S.S.) of mixing control device in matching device.

In fact, feedback control system controls according to the information of analysis process system.The information of described analysis process system is exactly qualified, the underproof information of above-mentioned judgement firming body.If analysis process system is judged as qualified, then feedback control system does not carry out any operation, and apparatus of the present invention carry out the scanning of next pail for used dressings 4, if judge, the pail for used dressings 4 of current detection is defective, then need to be adjusted by feedback control system.

Certainly, because analysis process system analyzes result, people can according to result and the actual demand of oneself, and carry out actual adjustment, the scheme that the invention provides a kind of adjustment is as follows:

Through great many of experiments, it is as follows that we sum up a relational expression:

$D=N\frac{M}{\mathrm{VT}}---\left(5\right)$

Wherein D is factor of porosity and flaw size, M is the amount (three mixes by a certain percentage) of waste liquid, cement, adjuvant, V is stir speed (S.S.), T is mixing time, N is hole " porosity and flaw size " and the experience factor of " waste liquid, cement, adjuvant, stir speed (S.S.) and mixing time " founding mathematical models, draws through great many of experiments.

N, M, V, T of current tested pail for used dressings 4 are known, and so we can draw the value of D, and in this value and analysis process system, gray value differences exists corresponding relation, and gray value differences is large, and greatly, preset value can preset qualified gray value differences and D value to D value.

If judge, firming body is defective, need be handled as follows by feedback control system:

(1) increase stir speed (S.S.) and mixing time, then measure, if qualified, then terminate; If defective, proceed to the 2nd step.

(2) stir after increasing a small amount of cement, water and adjuvant, then measure, if qualified, then terminate; If defective, proceed to the 1st step.

Certain people can the value of analysis process system, needs to determine Adjusted Option, not necessarily according to the method that the present embodiment provides by oneself.

Claims (9)

1. a pail for used dressings medium level waste solidified cement body crack detecting device, is characterized in that:

Comprise travelling belt, for transmitting pail for used dressings;

Be arranged on the gamma ray generating means of travelling belt side, for generation of gamma ray;

Being arranged on travelling belt opposite side, being positioned at the gamma-ray detector system on gamma ray generating means opposite, being produced by gamma ray generating means for detecting, gamma ray after firming body in pail for used dressings is decayed, and be translated into pulse signal matrix;

Be arranged on the stationary installation of travelling belt both sides, for fixing gamma ray generating means and gamma-ray detector system, height both regulating and the distance with travelling belt;

The analysis process system be connected with the output terminal 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 the image information of itself and qualified radioactive waste solidified cement body is contrasted, judge that whether tested pail for used dressings medium level waste solidified cement body is qualified;

The feedback control system be connected with the output terminal of analysis process system, described feedback control system connects matching device and the mixing control device of radioactive waste solidified cement body, according to the information of analysis process system, control the proportioning of waste liquid, cement and adjuvant and the stir speed (S.S.) of mixing control device in matching device.

2. pail for used dressings medium level waste solidified cement body crack detecting device according to claim 1, it is characterized in that: described gamma ray generating means comprises gamma ray standard source, biological shielding shell and source collimating apparatus, described gamma ray standard source is 10mCi ⁶⁰co isotopic standard body source, for generation of the gamma ray of 1.17MeV and 1.33MeV energy; Described source collimator material is plumbous, and for making gamma ray penetrate from fan-shaped narrow slit, described biological shielding shell is wrapped in gamma ray standard source outer wall, and material is plumbous.

3. pail for used dressings medium level waste solidified cement body crack detecting device according to claim 1, it is characterized in that: described gamma-ray detector system comprises gamma-ray detector and detector collimating apparatus fixed thereon, described gamma-ray detector is the linear array CMOS gamma-ray detector that length is identical with pail for used dressings height, and described detector collimator material is plumbous.

4. pail for used dressings medium level waste solidified cement body crack detecting device according to claim 1, is characterized in that: described analysis process system comprises

The signal acquiring system be connected with gamma-ray detector, for obtaining the pulse signal matrix that gamma-ray detector exports, and is converted to digital signal matrix, the gamma ray intensity matrix namely after decay;

The data handling system be connected with signal acquiring system, for obtain signal acquiring system export decay after gamma ray intensity matrix, and be converted into average line attenuation coefficient matrix, the 2-D gray image of pail for used dressings scanning survey is set up according to average line attenuation coefficient matrix, and the image information of itself and qualified radioactive waste solidified cement body is contrasted, if gray-scale value difference is greater than preset value, think that the factor of porosity of firming body in pail for used dressings and flaw size are greater than allowed band, be judged as defective, otherwise qualified;

The display system be connected with data handling system, for showing the 2-D gray image of foundation, firming body factor of porosity and flaw size information.

5. pail for used dressings medium level waste solidified cement body crack detecting device according to claim 4, is characterized in that: the method being average line attenuation coefficient matrix by the gamma ray intensity matrix conversion after decay is:

Attenuation law according to monoenergetic narrow beam gamma ray:

$I=I_0{\mathrm{ge}}^{-\underset{i}{\mathrm{\Σ}}{\mathrm{\μ}}_{\mathrm{mi}}{\mathrm{g\ρ}}_i{\mathrm{gd}}_i}---\left(1\right)$

Wherein I is gamma ray intensity after decay, I ₀for initial gamma transmitted intensity, μ _mifor the mass attenuation coefficient of material i, ρ _ifor the density of material i, d _ifor the thickness of material i.What suppose that each gamma ray passes is uniform dielectric, and density is identical, then above formula can be exchanged into:

$I=I_0{\mathrm{ge}}^{\stackrel{\‾}{\mathrm{\μ}}\mathrm{gD}}---\left(2\right)$

Wherein for the average line attenuation coefficient through medium, D is overall attenuation thickness.According to travelling belt 7 transfer rate V, pail for used dressings radius R and measurement time t, can obtain terminating to measurement from measurement, the computing formula of D is:

$D=2\sqrt{R^2-{(R-\mathrm{Vgt})}^2}---\left(3\right)$

Simultaneous (2), (3) formula, can obtain computing formula be:

$\stackrel{\‾}{\mathrm{\μ}}=\frac{\mathrm{In}{I}_0/I}{2\sqrt{R^2-{(R-\mathrm{Vgt})}^2}}---\left(4\right)$

In formula, initial gamma transmitted intensity I ₀, transfer rate V, pail for used dressings radius R and measurement time t be known quantity, can obtain average line attenuation coefficient according to gamma ray intensity I after decay

6. a pail for used dressings medium level waste solidified cement body crack detection method, is characterized in that: comprise the following steps:

(1) pail for used dressings that firming body is housed is positioned on the travelling belt of motion, draw near through gamma ray generating means and gamma-ray detector, gamma ray generating means launches gamma ray to pail for used dressings, scans firming body in pail for used dressings; The gamma-ray detector system being positioned at gamma ray generating means opposite obtains the gamma ray after the decay of pail for used dressings firming body, and gamma ray is converted to pulse signal is sent to analysis process system;

(2) analysis process system obtains the pulse signal that signal acquiring system exports, for obtaining pulse signal matrix, the 2-D gray image of pail for used dressings scanning survey is set up after process, and the image information of itself and qualified radioactive waste solidified cement body is contrasted, judge that whether tested pail for used dressings medium level waste solidified cement body is qualified;

(3) qualified if survey pail for used dressings medium level waste solidified cement body, then carry out the next one to measure, otherwise feedback control system, according to the information of analysis process system, controls the proportioning of waste liquid, cement and adjuvant and the stir speed (S.S.) of mixing control device in matching device.

7. pail for used dressings medium level waste solidified cement body crack detection method according to claim 6, is characterized in that: described step (1) is specially:

(11) according to pail for used dressings regulation fixing apparatus to be measured, make gamma ray generating means be positioned at pail for used dressings middle, the gamma ray penetrated from fan-shaped narrow slit can cover two summits up and down of pail for used dressings completely;

(12) travelling belt uniform motion, sends to the pail for used dressings that radioactive waste solidified cement body is housed and detects position;

(13) gamma ray generating means and gamma-ray detector system is started, the gamma ray that gamma ray standard source is released is through the fan-shaped narrow slit injection of source collimating apparatus from source collimating apparatus, after firming body decay in pail for used dressings, received by gamma-ray detector and form pulse signal;

(14) travelling belt uniform motion, make pail for used dressings completely by detecting position, complete the scanning survey to pail for used dressings, gamma-ray detector is recorded to the gamma ray pulse signal of gamma ray after pail for used dressings decay, is converted into pulse signal matrix and is sent to analysis process system.

8. pail for used dressings medium level waste solidified cement body crack detection method according to claim 6, is characterized in that: described step (2) is specially:

(21) signal acquiring system obtains the pulse signal matrix that gamma-ray detector exports, and is converted to digital signal matrix, the gamma ray intensity matrix namely after decay;

(22) data handling system obtain signal acquiring system export decay after gamma ray intensity matrix, and be converted into average line attenuation coefficient matrix, the 2-D gray image of pail for used dressings scanning survey is set up according to average line attenuation coefficient matrix, and the image information of itself and qualified radioactive waste solidified cement body is contrasted, if gray-scale value difference is greater than preset value, think that the factor of porosity of firming body in pail for used dressings and flaw size are greater than allowed band, be judged as defective, otherwise qualified;

(23) display system shows 2-D gray image, firming body factor of porosity and the flaw size information set up through step (22).

9. pail for used dressings medium level waste solidified cement body crack detection method according to claim 8, is characterized in that: described step (22) is specially:

Be average line attenuation coefficient matrix by gamma ray intensity matrix conversion after decay, method is:

Attenuation law according to monoenergetic narrow beam gamma ray:

$I=I_0{\mathrm{ge}}^{-\underset{i}{\mathrm{\Σ}}{\mathrm{\μ}}_{\mathrm{mi}}{\mathrm{g\ρ}}_i{\mathrm{gd}}_i}---\left(1\right)$

Wherein I is gamma ray intensity after decay, I ₀for initial gamma transmitted intensity, μ _mifor the mass attenuation coefficient of material i, ρ _ifor the density of material i, d _ifor the thickness of material i.What suppose that each gamma ray passes is uniform dielectric, and density is identical, then above formula can be exchanged into:

$I=I_0{\mathrm{ge}}^{\stackrel{\‾}{\mathrm{\μ}}\mathrm{gD}}---\left(2\right)$

Wherein for the average line attenuation coefficient through medium, D is overall attenuation thickness.According to travelling belt 7 transfer rate V, pail for used dressings radius R and measurement time t, can obtain terminating to measurement from measurement, the computing formula of D is:

$D=2\sqrt{R^2-{(R-\mathrm{Vgt})}^2}---\left(3\right)$

Simultaneous (2), (3) formula, can obtain computing formula be:

$\stackrel{\‾}{\mathrm{\μ}}=\frac{\mathrm{In}{I}_0/I}{2\sqrt{R^2-{(R-\mathrm{Vgt})}^2}}---\left(4\right)$

In formula, initial gamma transmitted intensity I ₀, transfer rate V, pail for used dressings radius R and measurement time t be known quantity, can obtain average line attenuation coefficient according to gamma ray intensity I after decay