CN108957519A - A kind of preparation method in radgas mock standard source - Google Patents
A kind of preparation method in radgas mock standard source Download PDFInfo
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- CN108957519A CN108957519A CN201810492172.3A CN201810492172A CN108957519A CN 108957519 A CN108957519 A CN 108957519A CN 201810492172 A CN201810492172 A CN 201810492172A CN 108957519 A CN108957519 A CN 108957519A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T7/00—Details of radiation-measuring instruments
- G01T7/02—Collecting means for receiving or storing samples to be investigated and possibly directly transporting the samples to the measuring arrangement; particularly for investigating radioactive fluids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T1/00—Measuring X-radiation, gamma radiation, corpuscular radiation, or cosmic radiation
- G01T1/36—Measuring spectral distribution of X-rays or of nuclear radiation spectrometry
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Abstract
The invention belongs to detection Technology for Radioactive Substances fields, are related to a kind of preparation method in radgas mock standard source.The preparation method is that the accurately known radioactive solution of specific activity is added dropwise to host surface again after adding adhesive 1.5-3 minutes to host surface, and the radgas mock standard source is thus prepared.Using the preparation method in radgas mock standard source of the invention, radgas mock standard source can be preferably prepared.
Description
Technical field
The invention belongs to detection Technology for Radioactive Substances fields, are related to a kind of preparation side in radgas mock standard source
Method.
Background technique
The utilization of nuclear facilities and nuclear technology can all discharge radgas into atmosphere, in order to monitor the radioactivity of discharge
Whether the activity of gas meets emission request, needs to measure analysis to the radioactive activity of discharge gas.And in radioactivity
In the measurement analysis of gas, the radgas of HPGe gamma ray spectrometer method monitoring reactor chimney discharge stream is generallyd use.Gamma ray spectrometer
Method carries out gas sample by gas sample collector first, reuses gamma ray spectrometer and carries out activity measurement to gas sampled and divide
Analysis.
Radionuclide specific activity is the source item of Evaluation Environment quality, and the accurate activity for measuring radionuclide gas depends on
To the full-energy peak efficiency scale of discharge radionuclide.Gamma-rays full-energy peak efficiency and sample geometry, sample rate, measurement
The factors such as geometrical condition and energy of γ ray are related.Inertia in sampler is usually paid close attention in Measurement Of Activity Of Radioactive
Gas nuclide activity, such as133Xe、127Xe、85Kr and41The typical radgas monitoring nucleic that the fission such as Ar or activation generate
Activity.
Since there are certain difficulties for radgas direct sample measurement, and pay close attention to133Xe radioactivity gas
Body half-life period is shorter, cannot achieve and directly uses HPGe gamma ray spectrometer pair133The activity measurement of Xe radioactivity gas sampled and analysis,
In order to accurately measure the radgas activity of discharge, need to develop and actual radiation gas sample collector geometry, size
And sample container material is identical, and gas mock standard similar in selected host material density and practical sampling sample rate
Source.
Gas mock standard source can realize the accurate calibration of discharge nucleic full-energy peak efficiency, realize the efficiency of online gamma ray spectrometer
Calibration, to provide Metrology Support for Emanations Analysis under daily Radiation monitoring and accident condition.Therefore, gas mock standard source
Metering of the preparation method to the efficiency calibration for realizing online gamma ray spectrometer and to Emanations Analysis under daily Radiation monitoring and accident condition
Guarantee all has great importance.
Summary of the invention
The object of the present invention is to provide a kind of preparation methods in radgas mock standard source, can preferably prepare
Radgas mock standard source.
In order to achieve this, the present invention provides a kind of radgas mock standard source in the embodiment on basis
Preparation method, the preparation method are after adding adhesive 1.5-3 minutes to host surface again to host material table
The accurately known radioactive solution of specific activity is added dropwise in face, and the radgas mock standard source is thus prepared.
The sample of on-line measurement is radgas, and the selection principle of gas mock standard source host material is that its density is wanted
With gas sampled density as close as.When gas sampled density and calibration source density difference are very big, it is necessary to meter
Digit rate carries out Self absorption Correction, otherwise can affect to the not exactness of final result.So being used as much as possible close to wait measure
The substance of sample gas density is as host material.
The accurately known radioactive solution drop of specific activity is being fixed on 96 hole enzymes by the drop source method in gas mock standard source
On each EPS (Expanded polystyrene spheres, expandable polystyrene particle) on target.In order to guarantee
Radioactive solution is uniform, is firmly adhered on EPS, needs to select suitable adhesive and adhesion time.The adhesive of selection
Meet that molecule small as far as possible, slow curing, adhesive force are strong etc. to be required.Non- put has been carried out respectively to test and putting test to determine adherency
Agent.In order to determine whether the radioactive sample dripped on EPS can be attracted to gas sample wall, respectively to gas sample wall
Radioactive absorption and gas sample collector bottom measure radioactive absorption, adsorption rate result is ten thousand/and it is several,
It can be ignored.This further demonstrates selected adhesive and adhesion time is suitable.
For the requirement of the accuracy of the gas mock standard source radiation activity definite value of preparation, radioactivity used in source procedure is dripped
The accurate definite value of solution activity is by then carrying out to radioactive solution (stoste) to the accurate definite value of standardized radioactive solution activity
The dilution of proper proportion is calculated by the way that the specific activity of radioactivity dilution is calculated, then by difference weight method in drop source procedure
In prepare gas simulation source and use radioactivity dilution quality altogether, calculate the total activity value in gas mock standard source.
Gas mock standard source uncertainty source mainly has: standardized radioactive solution measurement result uncertainty, uniformly
Property result bring uncertainty, weigh it is molten in bring uncertainty, dilution bring uncertainty and source procedure processed
The loss bring uncertainty of liquid.
The uniformity in gas mock standard source is not only an important indicator of examination radioactive source, and the quality of uniformity
Directly affect the uncertainty of online gamma ray spectrometer efficiency calibration.It is special due to gas sample collector when carrying out uniformity measurement
Construction mainly corresponds to the Characteristic γ ray full energy peak of nucleic with each orientation in HPGe gamma ray spectrometer measurement gas mock standard source
Counting rate is determined the uniformity in gas mock standard source by the consistency of counting rate.
In a preferred embodiment, the present invention provides a kind of preparation method in radgas mock standard source,
Wherein the host material is selected from sponge, expandable polystyrene, polyethylene, filter paper, polyurethane foam plastics or can
Hair property granules of polystyrene.
In a preferred embodiment, the present invention provides a kind of preparation method in radgas mock standard source,
Wherein the host material is fixed in 96 hole elisa Plates.
In a preferred embodiment, the present invention provides a kind of preparation method in radgas mock standard source,
Wherein the adhesive is polyvinyl acetal adhesive (the Polyvinyl alcohol that mass percent concentration is 5-15%
acetal adhesive)。
In a preferred embodiment, the present invention provides a kind of preparation method in radgas mock standard source,
Wherein the accurately known radioactive solution of the specific activity the preparation method is as follows:
Determine that the accurately known radioactivity of the specific activity before dilution is molten according to the specific activity of standardized radioactive solution
The specific activity of liquid determines the specific activity of the accurately known radioactive solution of the specific activity according to extension rate.
In a kind of more preferred embodiment, the present invention provides a kind of preparation side in radgas mock standard source
Method, wherein other γ nucleic impurity contents are less than or equal to the 0.1% of whole γ radionuclide content in the standardized radioactive solution.
In a preferred embodiment, the present invention provides a kind of preparation method in radgas mock standard source,
Wherein the preparation method is also to the radial and axial progress uniformity inspection in the radgas mock standard source being prepared point
It tests.
In a kind of more preferred embodiment, the present invention provides a kind of preparation side in radgas mock standard source
Method, wherein the uniformity inspection is the spy for corresponding to nucleic with each orientation in HPGe gamma ray spectrometer measurement gas mock standard source
Gamma-rays full energy peak counting rate is levied, the uniformity in gas mock standard source is determined by the consistency of counting rate.
In a kind of more preferred embodiment, the present invention provides a kind of preparation side in radgas mock standard source
Method, the specific method that wherein degree of radial uniformity is examined is:
Using certain thickness (60mm) and the lead collimator at the angle 45o is opened, the gas mock standard source of preparation is vertically put
Surface on the collimator is set, gas mock standard source is rotated with axle center along collimator institute's opening angle, corotating 8 times, diameter
The measurement of HPGe gamma ray spectrometer is carried out to different fan-shaped volume elements, to determine the degree of radial uniformity in gas mock standard source.
In a kind of more preferred embodiment, the present invention provides a kind of preparation side in radgas mock standard source
Method, wherein the specific method of axial uniformity inspection is:
On the basis of degree of radial uniformity is examined, gas mock standard source is overturn into the angle 90o, and by gas mock standard source
It is placed in two lead annulus of (30mm) spaced apart (thickness: 60mm), makes gas mock standard source axially translated,
The measurement of HPGe gamma ray spectrometer is carried out to the cylinder volume elements at axially distinct position, to determine the axial uniform of gas mock standard source
Degree.
The beneficial effects of the present invention are, can using the preparation method in radgas mock standard source of the invention
Preferably prepare radgas mock standard source.
Beneficial effects of the present invention are embodied in:
(1) when gas sampled density to be measured and calibration source density difference are very big, it is necessary to carry out self-priming to meter digit rate
Amendment is received, otherwise will affect the result of the efficiency calibration of online gamma ray spectrometer.So the present invention is used as much as possible close to sampling to be measured
The substance of gas density such as selects EPS as the host material in gas mock standard source as host material, and density can be with
To the full extent close to the density of practical gas sampled to be measured, to improve the accuracy of gamma ray spectrometer efficiency calibration result.
(2) it can be good at the uniformity of radioactivity drop of the control drop on EPS using continuous dispenser manually, simultaneously
The repeatability that ensure that radioactive solution liquid separation well, ensure that the requirement of the uniformity of gas simulation source.In addition, adhesive
Use ensure that radioactive solution can uniformly, be firmly attached on EPS；It ensure that gas mock standard source using week
Radioactive substance does not fall off, is not adsorbed on gas sampled device wall in phase, avoids the generation of radioactive pollution.Due to adherency
The selection of agent can make gas sample collector wall to radioactive adsorption rate and gas sample collector bottom to radioactive adsorption rate
It is reduced to ten thousand/it is several, cause gas sample collector wall to radioactivity absorption very little to can be ignored, so it is believed that putting
Penetrating property standard solution is all transferred in EPS host material, to reduce definite value result bring uncertainty.
(3) the total activity value in gas mock standard source is calculated by difference weight method, i.e., closes before and after source processed using by calibrating
Ten a ten thousandth electronic balances of lattice carry out correct amount, obtained radioactivity dilution it is of poor quality multiplied by radioactivity dilution
Specific activity, calculate the total activity value in gas mock standard source.Since the accuracy of ten a ten thousandth balances is very high, to protect
The accuracy of gas mock standard source definite value result is demonstrate,proved.Gas mock standard source preparation process is analyzed comprehensively due to of the invention
In all uncertainty sources, thus for gas mock standard source carry out online gamma ray spectrometer efficiency calibration interpretation of result
Excellent basis is established.
(4) since uniformity index is that the most important technical indicator of examination radioactive source and gas mock standard source are most heavy
The uncertainty source wanted, therefore uniformity detection is carried out according to radial and axial both direction.Gas is measured with HPGe gamma ray spectrometer
Each orientation corresponds to the Characteristic γ ray full energy peak counting rate of nucleic in mock standard source, it is ensured that uniformity detection can use up
Each orientation in possible blanketing gas sampler makes gas mock standard source to improve the accuracy of uniformity measurement
Uniformity data more comprehensively, it is more reliable.
Specific embodiment
A specific embodiment of the invention is further illustrated below.
The preparation method in radgas mock standard source of the invention is to add adhesive to host surface
The accurately known radioactive solution of specific activity is added dropwise to host surface again after 1.5-3 minutes, radioactivity is thus prepared
Gas mock standard source, and to the radial and axial carry out uniformity inspection in the radgas mock standard source being prepared point.
The research process of preparation method of the invention is divided into following four major part:
1, the selection of host material
The sample of on-line measurement is radgas, and the selection principle of gas mock standard source host material is that its density is wanted
With gas sampled density as close as.When gas sampled density and calibration source density difference are very big, it is necessary to meter
Digit rate carries out Self absorption Correction, otherwise can affect to the not exactness of final result, so being used as much as possible close to wait measure
The substance of sample gas density is as host material.Gas sampled to be measured includes a variety of inert gas cores such as air, Ar, Kr and Xe
Element, gas sampled to be measured are usually to be sampled in sampler by compression, and big consistency is (7.76-9.03) g/L.In this base
Other characteristics of selected host material are considered on plinth.
Preparing gas mock standard source is directly to drip radioactive solution on host material, the medium strip of radioactive solution
Part is essentially all weak acid system, so the host material selected wants energy weak acid resistant.Since gas mock standard source will be protected for a long time
It deposits and property is stablized, so the host material selected should be able to be unlikely to deform damage in the case where long-term preservation.
The host material in most suitable gas mock standard source is determined according to the requirement of above several respects.With lower close
The material of degree has sponge, expandable polystyrene, polyethylene, filter paper, polyurethane foam plastics and expandable polystyrene
Particle (hereinafter referred to as EPS) etc..
EPS has characteristics that
(1) density is 8.8g/L, the density of closest gas sampled to be measured, and centering, the self-absorption of low-energyγ-ray
Influence very little；
(2) be a kind of light polymer, be using polystyrene resin be added foaming agent simultaneously heat progress it is soft
Change and generate gas, a kind of foamed plastics of rigid closed cell structure of formation, uniform closed cavity structure makes it have moisture resistance
The features such as good, good heat preservation performance of property, light weight and high mechanical strength；
(3) stablize in water with chemical property in soil, cannot be decomposed by the microorganisms；
(4) its cavity structure keeps the infiltration of water extremely slow；
(5) property is stablized in most of solvents, and the ability with certain weak acid resistant and resistance to weak base.
So determining EPS as the host material in gas mock standard source.
2, the selection and adsorption test of source method, adhesive are dripped
The drop source method in gas mock standard source is using German Brand continuous dispenser (working principle: will substantially manually
Long-pending radioactive solution is divided into continuous drop several times and liquid separation repeatability is determined by experiment on EPS.The dispenser repeatability is very
It is good, can satisfy the requirement of the uniformity in gas mock standard source completely) the accurately known radioactive solution drop of specific activity exists
It is fixed on each EPS in 96 hole elisa Plates.
In order to guarantee that radioactive solution is uniform, be firmly adhered on EPS, when needing to select suitable adhesive and adherency
Between.In order to preferably make radionuclide firmly be adhered to the surface EPS, need to select molecule small as far as possible, slow curing, adhesive force strong
Water accack, being determined through experimentation the polyvinyl acetal adhesive that mass percent concentration is 8% is radgas mould
Required suitable adhesive in quasi- standard source preparation process.By be added blue ink it is non-put carrier solution and drip respectively do not having
Have on adhesive and EPS with adhesive, observes experimental phenomena.Droplet profile ratio on EPS particle containing adhesive is not
Add the droplet profile of adhesive more flat, that is to say, that adhesive has played the diffusion of molecule.Containing viscous after drying
It can be observed that the dispersibility of solution is relatively good on attached dose of EPS particle；And the solution not plus on the EPS particle of adhesive is obvious
Be collected on together, it was demonstrated that on the EPS containing adhesive the diffusivity of drop than not plus adhesive EPS on drop expansion
It is good to dissipate property.It will be containing adhesive and not plus after the EPS of adhesive preservation a period of time, it can be seen that the sample box containing adhesive
The blue ink color not found on EPS is covered to fall off；And the sample box of adhesive is not added to cover the face for obviously having blue ink
Color falls off.
In order to preferably guarantee that radioactive solution uniformly, is firmly attached on EPS, tests and determine that adhesive is optimal viscous
The attached time.The droplet profile being not added in adhesive and different time on the EPS particle of addition adhesive is done respectively a series of
Comparative experiments, it is determined that optimal adhesion time.By being added within adhesive 1.5-3min known to experiment, adhesive
Adhesiveness can all meet needs.Therefore the optimal adhesion time is adhesive 1.5min or so to be added, while experimental phenomena also turns out
The diffusivity of the rear dropping liquid of 1.5min or so is preferably also most uniform.
By above-mentioned a series of experiments, selected adhesive is the glue of the slow curing type containing vinyl alcohol molecule.
In order to which whether the adhesive for verifying selection is suitable, adsorption experiment is done under conditions of on-radiation first.It will be added
The non-carrier solution of putting of blue ink drips on the EPS with adhesive, after natural drying, EPS is put into the sample processed
In box.Sample box equipped with non-setting-out product is placed on oscillator and is sufficiently vibrated, later blue of the observation drop on EPS whether by
It adsorbs or falls in sample box.It falls off after acutely vibrating, observing that blue of the drop on the surface EPS has no, institute
, adhesion time good with selected adhesive adhesion property be suitable for.According to the experimental result of cold experiment, it is determined that suitable adhesive
And adhesion time.
In order to further verify whether under test gas sampling wall has absorption to radioactivity, select133Ba radioactivity
The gas simulation source sample of standard solution preparation specifically has drop to do radioactive adsorption test133Ba radioactive solution
Gas simulation source be placed on oscillator sufficiently oscillation after do adsorption test, use Low background gamma spectrum Substandard device carry out
Measurement.In test,133Ba gas simulation source is apart from detecting head surface 3-5mm, live time 50000s, respectively to filling radioactivity sample
Empty container and scraps of paper meter digit rate of the sample container, sample of product after oscillation after taking-up radioactive sample.
Gas sample wall is very much to radioactive adsorption rate to radioactive adsorption rate and gas sample collector bottom
It is several, this further demonstrates selected adhesive and adhesion time is suitable.Since gas sample collector inhales radioactivity
Attached very little, therefore can be ignored, that is to say, that selected adhesive adhesion property is good, and selected adhesion time is suitable, can
To meet the preparation requirement in gas mock standard source.
3, definite value and the uncertainty evaluation in gas mock standard source
For the requirement of the accuracy of the gas mock standard source radiation activity definite value of preparation, radioactivity used in source procedure is dripped
The accurate definite value of solution activity is by then carrying out to radioactive solution (stoste) to the accurate definite value of standardized radioactive solution activity
The dilution of proper proportion (uses before and after source processed and passes through by the way that the specific activity of radioactivity dilution is calculated, then by difference weight method
Ten a ten thousandth electronic balances of calibrating carry out correct amount) the of poor quality of radioactivity dilution is obtained, it is diluted multiplied by radioactivity
The specific activity of liquid calculates the total activity value of gas mock standard.The uclear purity of the standardized radioactive solution used has to full
The requirement of other γ nucleic impurity≤0.1% of foot.The valued methods of radioactive solution are preferred 4 π β-γ and meet Substandard
Device measures, because smaller using the measurement result uncertainty that 4 π β-γ meet absolute method of measurement, can reduce gas
The uncertainty in mock standard source.
Gas mock standard source uncertainty by standardized radioactive solution activity definite value uncertainty, gas simulation source
The uncertainty of uniformity, the uncertainty of solution dilution introducing, drop source use radioactive solution weighing introducing after dilution
Uncertainty, determine in terms of the uncertainty five that the loss of radioactive solution introduces in source procedure processed.Standardized radioactive solution
Uncertainty refer to standardized radioactive solution preparation.The weighing of radioactive solution introduces after solution dilution and dilution
Uncertainty is mainly weighed bring uncertainty, and source, can be straight by calibration certificate first is that balance calibration uncertainty
It connects to obtain the partial uncertainty；Second is that the mobility of balance, i.e. uncertainty caused by unstability.
4, uniformity testing
Uniformity is to examine an important technical indicator of radioactive source.According to the construction of gas sample collector using longitudinal and
Radial two methods carry out the measuring study of uniformity.The uncertainty of uniformity measurement by radial and axial measurement result mark
Quasi- deviation synthesizes to obtain.
Since gas sample collector generally all has special construction, in order to guarantee that uniformity detection can cover as far as possible
Each orientation in gas sample collector, uniformity detection must be carried out according to radial and axial both direction.Carrying out uniformity survey
When amount, the Characteristic γ ray full energy peak of nucleic is mainly corresponded to each orientation in HPGe gamma ray spectrometer measurement gas mock standard source
Counting rate is determined the uniformity in gas mock standard source by the consistency of counting rate.
Radial uniformity detection method: using certain thickness (60mm) and opens the lead collimator at the angle 45o, by the gas of preparation
Body mock standard source is vertically disposed in collimator upper surface, source is rotated with axle center along collimator institute subtended angle degree, corotating 8 times,
The measurement of HPGe gamma ray spectrometer is carried out to radially different fan-shaped volume elements, with the radial uniformity in detection gas mock standard source.
Axial uniformity detecting method: gas mock standard source is overturn into the angle 90o on the basis of radial measurement, and source is put
It sets in two lead annulus of (30mm) spaced apart (thickness: 60mm), makes source axially translated, to axially distinct position
The cylinder volume elements at place carries out the measurement of HPGe gamma ray spectrometer, with the axial uniformity in detection gas mock standard source.
It is uniform using the relative standard deviation of Characteristic γ ray counting rate average value as every ray when uniformity calculates
Property testing result.Since the gamma-ray counting rate of different characteristic, counting statistics have difference, so that each Characteristic γ ray is uniform
Property calculated result is all different.The available preferable uniformity data of gamma-rays that counting rate is big, counting statistics error is small；And it counts
The gamma-rays that digit rate is small, counting statistics error is big is influenced that poor uniformity data can be obtained by statistic fluctuation.Therefore, with institute
Select the average value of the relative standard deviation of gamma-ray meter digit rate mean value as the radial uniformity testing result with axial direction, and finally
Using uniformity side axially and radially and root composite value as the uniformity results of simulation gas source, which is also used as uniformity band
The uncertainty come.
Preparation method by as above studying optimization is prepared for Malin's cup of 1 1L152Eu gas mock standard source, is used for
The efficiency calibration and efficiency of subsequent HPGe gamma ray spectrometer are supervised；Also it is prepared for mixing nucleic Malin's cup gas mock standard of 2 1L
Source, they include 8 kinds of nucleic altogether, respectively241Am、109Cd、57Co、51Cr、137Cs、54Mn、56Zn、88Y, energy range are
(59.54keV-1.836MeV).Mixing nucleic Malin's cup gas mock standard source of 2 1L realizes HPGe gamma ray spectrometer well
The efficiency calibration of full energy peak.
It tests respectively to above-mentioned 3 gas mock standards source, it is determined that their uniformity is superior to 1.6%.
According to the uncertainty evaluation method in gas mock standard source, gas mock standard source uncertainty is by radioactivity mark
The uncertainty of the activity definite value of quasi- solution, uncertainty, the solution dilution of gas simulation source uniform introduce not true
Fixed degree, drop source are drawn using the loss of radioactive solution in radioactive solution weighing is introduced into after dilution uncertainty, source procedure processed
It is determined in terms of the uncertainty five entered.Above-mentioned 3 gas mock standards source is obtained after synthesizing to these partial uncertainties
Uncertainty (k=2) be below 5%.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.If in this way, belonging to the model of the claims in the present invention and its equivalent technology to these modifications and changes of the present invention
Within enclosing, then the present invention is also intended to include these modifications and variations.Above-described embodiment or embodiment are only to the present invention
For example, the present invention can also be implemented with other ad hoc fashions or other particular form, without departing from of the invention
Main idea or substantive characteristics.Therefore, the embodiment of description is regarded as illustrative and non-limiting in any way.This
The range of invention should be illustrated that any variation equivalent with the intention and range of claim also should include by appended claims
Within the scope of the invention.
Claims (10)
1. a kind of preparation method in radgas mock standard source, it is characterised in that: the preparation method is to matrix
The accurately known radioactive solution of specific activity is added dropwise to host surface again after adding adhesive 1.5-3 minutes in material surface,
Thus the radgas mock standard source is prepared.
2. preparation method according to claim 1, it is characterised in that: it is poly- that the host material is selected from sponge, expandability
Styrene, polyethylene, filter paper, polyurethane foam plastics or expandable polystyrene particle.
3. preparation method according to claim 1, it is characterised in that: the host material is fixed on 96 hole elisa Plates
On.
4. preparation method according to claim 1, it is characterised in that: the adhesive is that mass percent concentration is 5-
15% polyvinyl acetal adhesive.
5. preparation method according to claim 1, which is characterized in that the accurately known radioactive solution of the specific activity
The preparation method is as follows:
The accurately known radioactive solution of the specific activity before dilution is determined according to the specific activity of standardized radioactive solution
Specific activity determines the specific activity of the accurately known radioactive solution of the specific activity according to extension rate.
6. preparation method according to claim 5, it is characterised in that: other γ nucleic in the standardized radioactive solution
Impurity content is less than or equal to the 0.1% of whole γ radionuclide content.
7. preparation method according to claim 1, it is characterised in that: radiation of the preparation method also to being prepared
Property gas mock standard source point radial and axial carry out uniformity inspection.
8. preparation method according to claim 7, it is characterised in that: the uniformity inspection is surveyed with HPGe gamma ray spectrometer
Each orientation corresponds to the Characteristic γ ray full energy peak counting rate of nucleic in amount gas mock standard source, true by the consistency of counting rate
Determine the uniformity in gas mock standard source.
9. preparation method according to claim 7, which is characterized in that the specific method that degree of radial uniformity is examined is:
Using certain thickness and the lead collimator of 45° angle is opened, the gas mock standard source of preparation is vertically disposed in collimator
Upper surface is rotated in gas mock standard source with axle center, corotating 8 times along collimator institute's opening angle, to radially different sector
Volume elements carries out the measurement of HPGe gamma ray spectrometer, to determine the degree of radial uniformity in gas mock standard source.
10. preparation method according to claim 9, which is characterized in that the specific method of axial uniformity inspection is:
On the basis of degree of radial uniformity is examined, gas mock standard source is overturn into 90 ° of angles, and gas mock standard source is placed
In two lead annulus spaced apart, make gas mock standard source axially translated, to the circle at axially distinct position
Cylinder member carries out the measurement of HPGe gamma ray spectrometer, to determine the axial uniformity in gas mock standard source.
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|---|---|---|---|---|
| CN115856994A (en) * | 2023-02-02 | 2023-03-28 | 北京中科核安科技有限公司 | Efficiency calibration method, device and system for gamma detector |
| CN115856994B (en) * | 2023-02-02 | 2023-05-05 | 北京中科核安科技有限公司 | Efficiency calibration method, device and system of gamma detector |
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