CN102540233B - Determination method for effective range of electronic beam radiation and banding dosage indicating meter - Google Patents
Determination method for effective range of electronic beam radiation and banding dosage indicating meter Download PDFInfo
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- CN102540233B CN102540233B CN 201110407695 CN201110407695A CN102540233B CN 102540233 B CN102540233 B CN 102540233B CN 201110407695 CN201110407695 CN 201110407695 CN 201110407695 A CN201110407695 A CN 201110407695A CN 102540233 B CN102540233 B CN 102540233B
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Abstract
The invention relates to a determination method for the effective range of electronic beam radiation and a banded measuring meter; the determination method is characterized by comprising the following steps of: firstly manufacturing glass dosage indicating meter bands arrayed in a (m, n) matrix manner by using common plate glass as a material, slantwise inserting the glass dosage indicating meterbands into a product box to be irradiated for carrying out irradiation, then taking out two rows of adjacent dosage meters with close color differences in the dosage indicating meter bands for superposition, and carrying out color comparison between the two rows of adjacent dosage meters and reference dosage meters which are arranged on the top surface of the product box and are used for irradiation, and finding out the positions of the dosage meters with equal colors, wherein the distances between the positions to the top surface of an irradiation box are the effective range of the electronic beam radiation, and the double-distance is the best irradiation thickness of the product. The determination method has the advantages of strong generality, low cost and convenience and rapidness in operation.
Description
Technical field
The present invention relates to a kind of electron beam irradiation dosimetry technology, especially a kind of method and quantimeter thereof for measurement products irradiation optimum depth, specifically a kind of assay method of electron beam irradiation effective range and banded quantimeter.
Background technology
As everyone knows, electron beam irradiation processing has that radiation power is big, dose rate is high, process velocity is fast, low cost and other advantages, develops very fast in recent years at home and abroad.According to incompletely statistics, China's electron accelerator has increased to more than 200 at present, but also presents a rapidly rising trend.Along with the fast development of electron beam irradiation processing industry, press for a cover and be applicable to the dosimetry system that electron-beam dose is measured.The method that can carry out the quantitative measurement of electron beam irradiation dosage at present has: calorimetry, beam current density meter, liquid chemical dosimeter and SOLID ORGANIC glass dosimeter and the glass dosimeter (patent No., 86105336, contain the measurement radiation dose glass of trace iron and titanium) five kinds.Wherein, liquid chemical dosimeter is made generally in glass ampoule bottles type or polystyrene Coin shape, and SOLID ORGANIC glass dosimeter and film dosimeter are made generally in the diaphragm type.Measuring method: generally adopt the optical density of spectrophotometric determination liquid or diaphragm, determine product irradiation absorbed dose size by its optical density difference after comparing predose.Irradiation dose size observational measurement method is: make circular label with dyestuff, be affixed on the illuminated object surface.Whether change color (reddish yellow) by circular label behind the predose indicates product irradiation.
Compare with gamma-rays, a little less than the penetration capacity (range is short), the dosage measurement means of selecting for use must adapt to These characteristics to electron beam in material.Density, product thickness, ray energy size and the sweep length of the absorbed-dose distribution of product and product are closely related in the electron beam irradiation processing, see Fig. 1,2.
Reduce the capacity usage ratio that product irradiation nonuniformity U (U=Dmax/Dmin) can improve device, common product will carry out two-sided irradiation (product carry out second time predose change face or upset), will control the packing thickness of product simultaneously according to the effective radiation range of electron beam in product.The thin emittance of then wasting thick then penetrates to pass by, and does not satisfy the requirement of product radiation lowest dose level.
The common method of Measurement of Electron Beam effective range is: in the photographed object product, keeping at a certain distance away lays quantimeter (aforesaid five kinds of quantimeters all can), takes out behind the irradiation certain hour, measures dose value, draw the dosage depth curve, thereby determine the half-value dose degree of depth and effective range.This method is a kind of quantitative measurment, be applicable to that electron accelerator is built successfully after, the fixed point of homogeneous substance energy distribution is accurately measured.Existing problems: 1) have the quantimeter interference problem.It is unreliable to lay few measurement result as quantimeter, lays the disturbing phenomenon that occurs at most the original energy distribution of electron beam irradiation; 2) laying quantimeter wastes time and energy; 3) cost is higher.
In the daily irradiation production run, product category is assorted, and quantity is indefinite, and the dosage of therefore arranging to need to predict product irradiation before the irradiation technique distributes.Simultaneously, for guaranteeing product irradiation quality, should follow the tracks of the product irradiation process, reach minimum irradiation dose requirement.This just need a kind of inexpensive and easily method estimate effective radiation range of product irradiation.
Summary of the invention
The objective of the invention is at existing irradiation dose assay method complexity, the problem of versatility difference provides a kind of applicability wide, the assay method of the electron beam irradiation effective range that cost is low and banded quantimeter.
Technical scheme of the present invention one of is:
A kind of assay method of electron beam irradiation effective range is characterized in that it may further comprise the steps:
At first, sheet glass is cut into rectangular block structure as the quantimeter elementary cell of vitrifying agent flow indicator D, and but described quantimeter elementary cell is arranged in cardboard, plastics, plank or dry goods attachment surface and the fixing vitrifying agent flow indicator D that forms, can closely connect also between each quantimeter elementary cell and can be spaced, form vitrifying agent flow indicator matrix and arrange { m; N}, wherein m is the quantity of length direction quantimeter elementary cell, m 〉=3; N is the quantity of Width quantimeter elementary cell, n 〉=1, and wherein each quantimeter elementary cell note is made D
(m, n), this vitrifying agent flow indicator matrix arrangement is called " dosage index gauge band " note and makes D
(m * n)
Secondly, place the referential incident dose index gauge of an incident band D at the upper surface of irradiation products
In, in the product irradiation box, place oblique cutting at least one for the depth dose index gauge band D of the dosage that fathoms
d, and guarantee m 〉=3 that vitrifying agent flow indicator matrix is arranged, namely the quantity of the quantimeter elementary cell of length direction is no less than three, depth dose index gauge band D
dLength should be greater than reality half by the irradiation products degree of depth; Depth dose index gauge band D
dAngle between upper surface and the electron beam line is not less than 30 degree; The referential incident dose index gauge of incident band D
InDepth dose index gauge band D with the dosage that fathoms
dThe layout that should misplace guarantees not incident dose index gauge band D simultaneously of same electron beam incident ray
InWith depth dose index gauge band D
dPrepare a vitrifying agent flow indicator D without irradiation simultaneously as background reference dose index strip D
0Incident dose index gauge band D
InAnd depth dose index gauge band D
dCan place in the identical product case during greater than bandwidth at the width of product package, otherwise answer branch mailbox to place;
The 3rd, the above-mentioned product of having laid all kinds of dosage index gauge bands placed on the electron accelerator conveyer implement irradiation; According to beam energy, product box thickness and product density situation, determine whether to change face irradiation; After all the irradiation operation is finished, take out all dosage index gauge band and carry out following observation and definite effective range:
1. two-sided irradiation situation: from incident and background reference dose index gauge band D
InAnd D
0Respectively get tablet amounts index gauge stack, be designated as A; From depth dose index gauge band D
D1 (m * n)With depth dose index gauge band D
D2 (m * n)Terminal m begins (supposing n=1), respectively gets a slice quantimeter elementary cell D
D1 (m, 1)And D
D2 (m, 1)Stack (is designated as B
m), compare A and B
mAberration, A-B
m＞0; The 2nd time from depth dose index gauge band D
D1 (m * n)With depth dose index gauge band D
D2 (m * n)Respectively get a slice quantimeter elementary cell D
D1 (m-1,1)And D
D2 (m-1,1)Stack (is designated as B
M-1), compare aberration A-B
M-1＞0...... is until aberration A-B
M-i=0; The i time from depth dose index gauge band D
D1 (m * n)With depth dose index gauge band D
D2 (m * n)Respectively get a slice quantimeter elementary cell D
D1 (m-i-1,1)And D
D2 (m-i-1,1)Stack (is designated as B
M-i-1), compare aberration A-B
M-i-1＜0, and B
M-i+1＜B
M-i＜B
M-i-1Then m-i tablet amounts index gauge place is about electron beam to the half incident value degree of depth of test products;
Measure m-i tablet amounts meter elementary cell mid point to the upper and lower inside surface distance R of product box
D1And R
D2During two-sided irradiation, distance (R
D1+ R
D2) be electron beam under this energy to the best net thickness of test products irradiation.
2. single face irradiation situation:
From incident reference dose index gauge band D
InGet a tablet amounts index gauge, be designated as A
InFrom depth dose index gauge band D
D1 (m * n)(depth dose index gauge band D
D2 (m * n)In like manner) terminal m begins (supposing n=1) and gets a slice quantimeter elementary cell D
D1 (m, 1), be designated as B
m, compare A
InWith B
mAberration, A
In-B
m＞0; The 2nd time from depth dose index gauge band D
D1 (m * n)Get a slice quantimeter elementary cell D
D1 (m-1,1), be designated as B
M-1, compare aberration A
In-B
M-1＞0...... is until aberration A
In-B
M-i=0; The i time from depth dose index gauge band D
D1 (m * n)Get a slice quantimeter elementary cell D
D1 (m-i-1,1), be designated as B
M-i-1, compare aberration A
In-B
M-i-1＜0, and B
M-i+1＜B
M-i＜B
M-i-1, then m-i tablet amounts index gauge place equals the corresponding thickness of absorbed dose with electron beam incidence surface place for the product absorbed dose;
(or following inside surface is according to depth dose index gauge band D to the product box upper inner surface to measure m-i tablet amounts meter elementary cell lower limb far point
D (m * n)Riding position) distance R
D1During single face irradiation, distance R
D1Be electron beam under this energy to the best net thickness of test products irradiation.
The length of described vitrifying agent flow indicator is to treat half 1.414 times of the irradiation products degree of depth.
Described depth dose index gauge band D
d: respectively at the plane of incidence and 1 above dosage index gauge band of incident opposite direction oblique cutting in product, its dosage index gauge face and electron beam line form the above angle of 30 degree; Open with incident reference dose index gauge tape error.
Product box is at the irradiation optimum thickness R that changes under the face irradiation technique
D1+ R
D2
For improving the observation degree of accuracy and reducing range error, the length of quantimeter elementary cell should be greater than more than 3 times of its width.
For the low dose irradiation product, the dosage index gauge band that adopts thickness to make in the quantimeter elementary cell below 2 millimeters carries out irradiation, multilayer stack observation.
For the even complex product of density unevenness, depth dose index gauge band should be divided into several sections and place irradiation, corresponding point stack observation is to obtain the electron beam effective range at each position of product.
A kind of electron beam irradiation effective range is measured with stripe electron beam irradiation dose index gauge, it is characterized in that it is made up of glass sheet 1 and flexible fixed band 2 as the quantimeter elementary cell, at least fixedly have row to be no less than three glass sheet 1 on each flexible fixed band 2.
Described glass sheet 1 is fixed on the flexible fixed band 2 by row interval or next-door neighbour, should arrange at interval between row and the row.
Described glass sheet 1 is colourless transparent glass or the transparent simple glass of shallow background color.
Technical scheme of the present invention be two:
A kind of electron beam irradiation effective range is measured with stripe electron beam irradiation dose index gauge, it is characterized in that it is made up of glass sheet 1 and flexible fixed band 2 as the quantimeter elementary cell, at least fixedly have row to be no less than two glass sheet 1 on each flexible fixed band 2.
Described glass sheet 1 is fixed on the flexible fixed band 2 by row interval or next-door neighbour, should arrange at interval between row and the row.
Described glass sheet 1 is colourless transparent glass or shallow background color clear glass.
Beneficial effect of the present invention:
1, draws materials conveniently.Glass dosimeter can directly be purchased from decoration market.Only need the pre-irradiation test to select the significant glass material of color changeable effect to get final product before using.
2, cheap.Common organic glass quantimeter is more than at least 2 yuan, and quantimeter of the present invention several sharing money only.
3, colorimetric easily, more accurate.The variable color label is nontransparent, the colorimetric that can not superpose, naked eyes difficult judgment.
But 4, dosage METHOD FOR CONTINUOUS DETERMINATION.Cheap because of the band quantimeter, can lay continuously, shape can change with product, therefore can measure the product dosage dead point.
5, time saving and energy saving.Quantimeter directly insert in the product all can, the position determines easily, saves to lay the time.
6, the inventive method is simple and easy to do, and is easy to operate, quantitatively accurately, wide adaptability, the quantity that can adjust the quantimeter band according to density and the uniformity coefficient of product, thus determine the effective range position.
Description of drawings
Fig. 1 is in the electron beam irradiation processing of the present invention, under certain product density, and the graph of a relation of the absorbed-dose distribution of product and product thickness (the incident degree of depth), ray energy.
Fig. 2 is in the electron beam irradiation processing of the present invention, under certain beam energy, and the absorbed-dose distribution of product and the graph of a relation of sweep length.
Fig. 3 is that dosage index gauge of the present invention is placed on and carries out the electron accelerator irradiation synoptic diagram in the product.
Fig. 4 is the structural representation of banded dosage index gauge of the present invention.
Fig. 5 is banded dosage index gauge of the present invention different modes of emplacement synoptic diagram in the irradiation products case.
Embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
Embodiment one.
Shown in Fig. 3,4,5.
A kind of assay method of electron beam irradiation effective range, it may further comprise the steps:
At first, sheet glass is cut into rectangular block structure as the quantimeter elementary cell of vitrifying agent flow indicator D, and but described quantimeter elementary cell is arranged in cardboard, plastics, plank or dry goods attachment surface and the fixing vitrifying agent flow indicator D that forms, can closely connect also between each quantimeter elementary cell and can be spaced, form vitrifying agent flow indicator matrix and arrange { m; N}, wherein m is the quantity of length direction quantimeter elementary cell, m 〉=3; N is the quantity of Width quantimeter elementary cell, n 〉=1, and wherein each quantimeter elementary cell note is made D
(m, n), this vitrifying agent flow indicator matrix arrangement is called " dosage index gauge band " note and makes D
(m * n)
Secondly, place the referential incident dose index gauge of an incident band D at the upper surface of irradiation products
In, in the product irradiation box, place oblique cutting at least one for the depth dose index gauge band D of the dosage that fathoms
d, and guarantee m 〉=3 that vitrifying agent flow indicator matrix is arranged, namely the quantity of the quantimeter elementary cell of length direction is no less than three, depth dose index gauge band D
dLength should be greater than reality half by the irradiation products degree of depth; Depth dose index gauge band D
dAngle between upper surface and the electron beam line is not less than 30 degree; The referential incident dose index gauge of incident band D
InDepth dose index gauge band D with the dosage that fathoms
dThe layout that should misplace guarantees not incident dose index gauge band D simultaneously of same electron beam incident ray
InWith depth dose index gauge band D
dPrepare a vitrifying agent flow indicator D without irradiation simultaneously as background reference dose index strip D
0Incident dose index gauge band D
InAnd depth dose index gauge band D
dCan place in the identical product case during greater than bandwidth at the width of product package, otherwise answer branch mailbox to place;
The 3rd, the above-mentioned product of having laid all kinds of dosage index gauge bands placed on the electron accelerator conveyer implement irradiation, as shown in Figure 3; According to product box thickness and product density situation, determine whether to change face irradiation; After all the irradiation operation is finished, take out all dosage index gauge band and carry out following observation and definite effective range:
1. two-sided irradiation situation: from incident and background reference dose index gauge band D
InAnd D
0Respectively get tablet amounts index gauge stack, be designated as A; From depth dose index gauge band D
D1 (m * n)With depth dose index gauge band D
D2 (m * n)Terminal m begins (supposing n=1), respectively gets a slice quantimeter elementary cell D
D1 (m, 1)And D
D2 (m, 1)Stack (is designated as B
m), compare A and B
mAberration, A-B
m＞0; The 2nd time from depth dose index gauge band D
D1 (m * n)With depth dose index gauge band D
D2 (m * n)Respectively get a slice quantimeter elementary cell D
D1 (m-1,1)And D
D2 (m-1,1)Stack (is designated as B
M-1), compare aberration A-B
M-1＞0...... is until aberration A-B
M-i=0; The i time from depth dose index gauge band D
D1 (m * n)With depth dose index gauge band D
D2 (m * n)Respectively get a slice quantimeter elementary cell D
D1 (m-i-1,1)And D
D2 (m-i-1,1)Stack (is designated as B
M-i-1), compare aberration A-B
M-i-1＜0, and B
M-i+1＜B
M-i＜B
M-i-1Then m-i tablet amounts index gauge place is about electron beam to the half incident value degree of depth of test products;
Measure m-i tablet amounts meter elementary cell mid point to the upper and lower inside surface distance R of product box
D1And R
D2During two-sided irradiation, distance (R
D1+ R
D2) be electron beam under this energy to the best net thickness of test products irradiation.
2. single face irradiation situation:
From incident reference dose index gauge band D
InGet a tablet amounts index gauge, be designated as A
InFrom depth dose index gauge band D
D1 (m * n)(depth dose index gauge band D
D2 (m * n)In like manner) terminal m begins (supposing n=1) and gets a slice quantimeter elementary cell D
D1 (m, 1), be designated as B
m, compare A
InWith B
mAberration, A
In-B
m＞0; The 2nd time from depth dose index gauge band D
D1 (m * n)Get a slice quantimeter elementary cell D
D1 (m-1,1), be designated as B
M-1, compare aberration A
In-B
M-1＞0...... is until aberration A
In-B
M-i=0; The i time from depth dose index gauge band D
D1 (m * n)Get a slice quantimeter elementary cell D
D1 (m-i-1,1), be designated as B
M-i-1, compare aberration A
In-B
M-i-1＜0, and B
M-i+1＜B
M-i＜B
M-i-1, then m-i tablet amounts index gauge place equals the corresponding thickness of absorbed dose with electron beam incidence surface place for the product absorbed dose;
(or following inside surface is according to depth dose index gauge band D to the product box upper inner surface to measure m-i tablet amounts meter elementary cell lower limb far point
D (m * n)Riding position) distance R
D1During single face irradiation, distance R
D1Be electron beam under this energy to the best net thickness of test products irradiation.
Principle of the present invention is can become dark brown after utilizing glass irradiation, can be made into glass dose indicating meter.Given this, the present invention adopts glass material to make a kind of strip-type quantimeter, and as the increase of Fig. 4 along with the irradiation degree of depth, color is thin out gradually.Shade can intuitively be determined the effective radiation range in the electron beam irradiation processing.
Details are as follows:
One, the method for making of banded dosage index gauge (as Fig. 4)
1, be base material with simple glass sheet materials such as sheet glass, glass bottle and jar, vessel.
2, above-mentioned glass board material is cut into about 100mm
2Rectangular, make vitrifying agent flow indicator D (being the quantimeter elementary cell, hereinafter to be referred as the dosage index gauge).But this dosage index gauge is arranged in attachment surfaces and fixing such as cardboard, plastics, plank, cloth, can closely connect also can be spaced apart, constitutes dosage index gauge matrix and arrange { m; (wherein m is length direction dosage index gauge quantity to n}, m 〉=3; N is Width dosage index gauge quantity, n 〉=1.Wherein every tablet amounts index gauge note is made D
(m, n)This dosage index gauge matrix arrangement is called " dosage index gauge band " note and makes D
(m * n)
3, the total length of this dosage index gauge band should guarantee: after the radiation treatment, its end has at least a slice dosage to count area color.At least greater than the half thickness of actual product.
Two, using method (as Fig. 3,5)
1, above-mentioned " dosage index gauge band " placed and treat in the irradiation products.For preventing the interference of dosage index gauge band to being distributed by irradiation products dosage, adopt following laying method:
1) incident reference dose index gauge band D
In: place the product upper inner surface.
2) depth dose index gauge band D
d: respectively at the plane of incidence and 1 above dosage index gauge band of incident opposite direction oblique cutting in product, its dosage index gauge face and electron beam line form the above angle of 30 degree; Open with incident reference dose index gauge tape error.
3) background reference dose index gauge D
0: irradiation not.
4) incident reference dose index gauge band D
InAnd depth dose index gauge band D
dProduct box enough wide (spacing＞dosage index gauge bandwidth) time can place in the identical product case, otherwise answer branch mailbox to place.
5) incident reference dose index gauge band D
InAnd depth dose index gauge band D
dMiddle dosage index gauge D quantity is the least possible, satisfies observation and requires to get final product.It is overlooked drawing and must not intersect.
2, the product that will lay dosage index gauge band places and implements irradiation (as shown in Figure 3) on the electron accelerator conveyer.
3, according to product box thickness and product density situation, determine whether to change face irradiation.After all the irradiation operation was finished, taking-up dosage index gauge band was observed and definite best irradiation degree of depth.
Three, the assay method of the irradiation degree of depth
1, from incident and background reference dose index gauge band D
InAnd D
0Respectively get tablet amounts index gauge stack, be designated as A; From depth dose index gauge band D
D1 (m * n)With band D
D2 (m * n)Terminal m begins, and respectively gets a tablet amounts index gauge D
D1 (m, 1)And D
D2 (m, 1)Stack (is designated as B
m), compare A and B
mAberration, A-B
m＞0; The 2nd time from depth dose index gauge band D
D1 (m * n)With band D
D2 (m * n)Respectively get a tablet amounts index gauge D
D1 (m-1,1)And D
D2 (m-1,1)Stack (is designated as B
M-1), compare aberration A-B
M-1＞0...... is until aberration A-B
M-1=0; The i time from depth dose index gauge band D
D1 (m * n)] and band D
D2 (m * n)Respectively get a tablet amounts index gauge D
D1 (m-i-1,1)And D
D2 (m-i-1,1)Stack (is designated as B
M-i-1), compare aberration A-B
M-i-1＜0, and B
M-i+1＜B
M-i＜B
M-i-1Then m-i tablet amounts index gauge place is about electron beam to the half incident value degree of depth of test products.
2, measure m-i tablet amounts index gauge mid point to the upper and lower inside surface distance R of product box
D1And R
D2, this distance is that the particular energy electron beam is to the effective range of test products.
3, obtain this product box thus at the irradiation optimum thickness R that changes under the face irradiation technique
e=R
D1+ R
D2
4, for improving the observation degree of accuracy and reducing range error, can make dosage index gauge slice, thin piece do narrow as far as possible.
5, for the low dose irradiation product, can adopt the dosage index gauge slice, thin piece irradiation of thinner thickness, multilayer stack observation also can obtain the electron beam effective range with high dosage irradiation earlier.
6, for the even complex product of density unevenness, depth dose index gauge band can be divided into several sections and place irradiation, corresponding point stack observation is to obtain the electron beam effective range at each position of product.
Application examples 1.
Be irradiation flavoring on the electron accelerator of 10Mev at energy, density is 0.7g/cm
3, test products case thickness is 14cm.3 dosage index gauge bands are placed in the product box: 1. length 2cm incident reference dose index gauge band D
In (2 * 1)Place upper surface in the product box, 2. length 10cm (length: 14/2 * 1.414=9.9cm) depth dose index gauge band (plastic plate is carrier) D
D1 (10 * 1)From the about 45 ° of direction oblique cuttings of the plane of incidence in product, 3. length 10cm depth dose index gauge D
D2 (10 * 1)About 45 ° of direction oblique cuttings are in product from the incident opposite.Tow sides irradiation, dosage is about 10kGy, takes out the dosage index gauge, writes down dosage index gauge position.Respectively to incident and background reference dose index gauge D
InAnd D
0, depth dose index gauge D
D1 (10,1)And D
D2 (10,1), depth dose index gauge D
D1 (9,1)And D
D2 (9,1), depth dose index gauge D
D1 (8,1)And D
D2 (8,1)The observation that superposes obtains color A, B
10, B
9, B
8Through colorimetric, meet following condition: A-B
9=0 and A-B
10＞0, A-B
8＜0, B
10＜B
9＜B
8, so dosage index gauge D
D1 (9,1)And D
D2 (9,1)Midpoint is the effective range point of this flavoring, measures this point and is respectively 6.3cm and 6.3cm to the upper and lower inside surface distance of product box, and obtaining at the irradiation optimum thickness that changes food under the face irradiation technique is R
e=6.3+6.3=12.6cm.Therefore during actual product irradiation, product box thickness should be controlled at 12.6cm just can meet the lowest dose level requirement with interior.
Application examples 2
Be irradiation medical gloves on the electron accelerator of 10Mev at energy, density is 0.2g/cm
3, test products case thickness is 45cm.3 dosage index gauge bands are placed in the product box: 1. length 2cm incident reference dose index gauge band D
In (2 * 1)Place upper surface in the product box, 2. two length 32cm (length: 45/2 * 1.414=31.8cm) depth dose index gauge band (cardboard is carrier) D
D1 (32 * 1)And D
D2 (32 * 1)Respectively from left and right each the about 45 ° of direction oblique cutting of the plane of incidence in product.Adopt single face irradiation, dosage is about 20kGy, takes out the dosage index gauge, writes down dosage index gauge position.Respectively to incident and background reference dose index gauge D
InAnd D
0, depth dose index gauge D
D1 (32,1)And D
D2 (32,1), depth dose index gauge D
D1 (31,1)And D
D2 (31,1), depth dose index gauge D
D1 (30,1)And D
D2 (30,1)The observation that superposes obtains color A, B
32, B
31, B
30Through colorimetric, meet following condition: A-B
31=0 and A-B
32＞0, A-B
30＜0, B
32＜B
31＜B
30, so dosage index gauge D
D1 (31,1)And D
D2 (31,1)Midpoint is the effective range point of these medical supplies, measures this some upper surface distance to the product box and is all 20cm, and obtaining at the irradiation optimum thickness that changes medical gloves under the face irradiation technique is R
e=20 * 2=40cm.When therefore actual product changed face irradiation, product box thickness should be controlled at 40cm just can meet the lowest dose level requirement with interior.
Application examples 3
Application examples 3
Be irradiation prepacked food on the electron accelerator of 10Mev at energy, density is 0.4g/cm
3, test products case thickness is 15cm.2 dosage index gauge bands are placed in the product box: 1. length 2cm incident reference dose index gauge band D
In (1 * 1)Place upper surface in the product box, a 2. length 24cm depth dose index gauge band (strap is carrier) D
D1 (24 * 2)From the about 30 ° of direction oblique cuttings of the plane of incidence in product.Adopt single face irradiation, dosage is about 10kGy, takes out the dosage index gauge, writes down dosage index gauge position.Respectively to incident and background reference dose index gauge D
InAnd D
0, depth dose index gauge D
D1 (24,1)And D
D1 (24,2), depth dose index gauge D
D1 (23,1)And D
D1 (23,2), depth dose index gauge D
D1 (22,1)And D
D1 (22,2)With depth dose index gauge D
D1 (21,1)And D
D1 (21,2)The observation that superposes obtains color A, B
24, B
23, B
22, B
21Through colorimetric, meet following condition: A-B
22=0 and A-B
24＞0, A-B
23＞0, A-B
21＜0, B
23＜B
22＜B
21, so dosage index gauge D
D1 (22 * 2)Midpoint is the effective range point of this prepacked food, measures this point and is 10.8cm to product box upper inner surface distance, and obtaining at the irradiation optimum thickness that changes prepacked food under the face irradiation technique is R
e=10.8 * 2=21.6cm.Therefore during actual product irradiation, product box thickness should be controlled at 21.6cm just can meet the lowest dose level requirement with interior.
Application examples 4
Be irradiation pharmaceutic adjuvant on the electron accelerator of 1Mev at energy, density is 0.053g/cm
3, test products case thickness is 10cm.2 dosage index gauge bands are placed in the product box: 1. length 2cm incident reference dose index gauge band D
In (1 * 1)Place upper surface in the product box, a 2. length 12cm depth dose index gauge band (strap is carrier) D
D1 (24 * 2)From the about 30 ° of direction oblique cuttings of the plane of incidence in product.Adopt single face irradiation, dosage is about 15kGy, takes out the dosage index gauge, writes down dosage index gauge position.Respectively to incident and background reference dose index gauge D
InAnd D
0, depth dose index gauge D
D1 (24,1)And D
D1 (24,2), depth dose index gauge D
D1 (23,1)And D
D1 (23,2), depth dose index gauge D
D1 (22,1)And D
D1 (22,2)With depth dose index gauge D
D1 (21,1)And D
D1 (21,2)The observation that superposes obtains color A, B
24, B
23, B
22, B
21Through colorimetric, meet following condition: A-B
22=0 and A-B
24＞0, A-B
23＞0, A-B
21＜0, B
23＜B
22＜B
21, so dosage index gauge D
D1 (22 * 2)Midpoint is the effective range point of this pharmaceutic adjuvant, measures this point and is 5.4cm to product box upper inner surface distance, and obtaining at the irradiation optimum thickness that changes medicinal auxiliary material under the face irradiation technique is R
e=5.4 * 2=10.8cm.Therefore during actual product irradiation, product box thickness should be controlled at 10.8cm just can meet the lowest dose level requirement with interior.
Application examples 5
Be irradiation pet food on the electron accelerator of 5Mev at energy, density is 0.1g/cm
3, test products case thickness is 42cm.2 dosage index gauge bands are placed in the product box: 1. length 2cm incident reference dose index gauge band D
In (1 * 1)Place upper surface in the product box, a 2. length 44cm depth dose index gauge band (strap is carrier) D
D1 (44 * 2)From the about 30 ° of direction oblique cuttings of the plane of incidence in product.Single face irradiation, dosage is about 8kGy, takes out the dosage index gauge, writes down dosage index gauge position.Respectively to incident and background reference dose index gauge D
InAnd D
0, depth dose index gauge D
D1 (44,1)And D
D1 (44,2), depth dose index gauge D
D1 (43,1)And D
D1 (43,2), depth dose index gauge D
D1 (42,1)And D
D1 (42,2)With depth dose index gauge D
D1 (41,1)And D
D1 (41,2)The observation that superposes obtains color A, B
44, B
43, B
42, B
41Through colorimetric, meet following condition: A-B
42=0 and A-B
44＞0, A-B
43＞0, A-B
41＜0, B
43＜B
42＜B
41, so dosage index gauge D
D1 (42 * 2)Midpoint is the effective range point of this pet food, measures this point and is 21cm to product box upper inner surface distance, and obtaining at the irradiation optimum thickness that changes pet food under the face irradiation technique is R
e=21 * 2=42cm.Therefore during actual product irradiation, product box thickness should be controlled at 42cm just can meet the lowest dose level requirement with interior.
Application examples 6
Be that irradiation loads in mixture pet food on the electron accelerator of 10Mev at energy, this product density skewness, the highest and least density is respectively 0.3g/cm
3And 0.2g/cm
3, test products case thickness is 42cm, the Density Distribution of two casees products that test products is got and consistency of thickness.6 dosage index gauge bands are placed respectively in two product boxes: 1. two length 2cm incident reference dose index gauge band D
In (1 * 1) Place product box 1
#With case 2
#Interior upper surface, 2. two length 40cm depth dose index gauge bands (strap is carrier) D
D1 (40 * 1)And D
D2 (40 * 1)Respectively from left and right each the about 30 ° of direction oblique cutting of the plane of incidence at product box 1
#In.3. two length 40cm depth dose index gauge bands (strap is carrier) D
D3 (40 * 1)And D
D4 (40 * 1)Respectively from another plane of incidence (with respect to product box 1
#The opposite of the plane of incidence) left and right each about 30 ° of direction oblique cutting are at product box 2
# In.Product box 1
#Front irradiation, product box 2
#Reverse side irradiation, dosage is about 12kGy, takes out the dosage index gauge, writes down dosage index gauge position.Respectively to incident reference dose index gauge D in laying 1.
InWith background reference dose index gauge D
0, lay 2. with 3. in the color near point (very slight color point, comparison is earlier also rejected) mutually of matched doses index gauge band: depth dose index gauge D
D1 (40,1)And D
D3 (30,1), depth dose index gauge D
D1 (39,1)And D
D3 (29,1), depth dose index gauge D
D1 (38,1)And D
D3 (28,1)And depth dose index gauge D
D2 (40,1)And D
D4 (40,1), depth dose index gauge D
D2 (39,1)And D
D4 (29,2), depth dose index gauge D
D3 (38,1)And D
D4 (28,2)The observation that superposes obtains 1:D as a result
D1 (40 * 1)And D
D3 (40 * 1)Overlay color, A
1, B
1 40-30, B
1 39-29, B
1 38-28, through colorimetric, meet following condition: A
1-B
1 39-29=0 and A
1-B
1 40-30＞0, A
1-B
1 38-28＜0, B
1 40-30＜B
1 39-29＜B
1 38-28, so dosage index gauge D
D1 (39 * 1)And D
D3 (29 * 1)Midpoint is respectively this effective range point that loads in mixture pet food, measures this point to product box upper inner surface distance and is 19.25cm and 14.25cm.
Obtain 2:D as a result equally
D2 (40 * 1)And D
D4 (40 * 1)Overlay color, A
2, B
2 40-30, B
2 39-29, B
2 38-28, through colorimetric, meet following condition: A
2-B
2 39-29=0 and A
2-B
2 40-30＞0, A
2-B
2 38-28＜0, B
2 40-30＜B
2 39-29＜B
2 38-28, so dosage index gauge D
D2 (39 * 1)And D
D4 (29 * 1)Midpoint is respectively this effective range point that loads in mixture pet food, measures this point to product box upper inner surface distance and also is 19.25cm and 14.25cm.
Therefore this product is even in the Width upper density, but inhomogeneous in the depth direction upper density.This irradiation optimum thickness that loads in mixture pet food is R under the face irradiation technique changing
e=19.25+14.25=33.5cm.Therefore this product is along on the depth direction during irradiation, and product box thickness should be controlled at 33.5cm cm just can meet the lowest dose level requirement with interior.
Application examples 7
Be irradiation dehydrated vegetables on the electron accelerator of 3Mev at energy, density is 0.1g/cm
3, test products case thickness is 15cm.3 dosage index gauge bands are placed in the product box: 1. length 2cm incident reference dose index gauge band D
In (2 * 1)Place upper surface in the product box, a 2. length 22cm depth dose index gauge band (strap is carrier) D
D1 (22 * 1)And D
D2 (22 * 1)Respectively from left and right each the about 30 ° of direction oblique cutting of the plane of incidence in product.Single face irradiation, dosage is about 8kGy, takes out the dosage index gauge, writes down dosage index gauge position.Respectively to incident reference dose index gauge D
In, depth dose index gauge D
D1 (22,1)And D
D2 (22,1), depth dose index gauge D
D1 (21,1)And D
D2 (21,1), depth dose index gauge D
D1 (20,1)And D
D2 (20,1)Directly observe (observation need not superpose), obtain color A, B
1 22, B
2 22, B
1 21, B
2 21, B
1 20, B
2 20Through colorimetric, meet following condition: B
1 22=B
2 22＜B
1 21=A=B
2 21＜B
1 20=B
2 20, so dosage index gauge D
D1 (21,1)And D
D2 (21,1)Far point place, edge be the best range point of this dehydrated vegetables, measure this some upper surface distance to the product box and be all 10.5cm, the irradiation optimum thickness that obtains dehydrated vegetables under the single face irradiation technique is R
e=10.5cm.When therefore actual product carried out single face irradiation, product box thickness should be controlled at 10.5cm just can meet the lowest dose level requirement with interior.
Application examples 8
Be irradiation dehydrated vegetables on the electron accelerator of 3Mev at energy, density is 0.1g/cm
3, test products case thickness is 15cm.3 dosage index gauge bands are placed in the product box: 1. length 2cm incident reference dose index gauge band D
In (2 * 1)Place upper surface in the product box, a 2. length 26cm depth dose index gauge band (strap is carrier) D
D1 (26 * 1)And D
D2 (26 * 1)Respectively from left and right each the about 30 ° of direction oblique cutting of the plane of incidence in product.Single face irradiation, dosage is about 8kGy, takes out the dosage index gauge, writes down dosage index gauge position.Respectively to incident and background reference dose index gauge D
InAnd D
0, depth dose index gauge D
D1 (26,1)And D
D2 (26,1), depth dose index gauge D
D1 (25,1)And D
D2 (25,1), depth dose index gauge D
D1 (24,1)And D
D2 (24,1)The observation that superposes obtains color A, B
26, B
25, B
24Through colorimetric, meet following condition: A-B
25=0 and A-B
26＞0, A-B
24＜0, B
26＜B
25＜B
24, so dosage index gauge D
D1 (25,1)And D
D2 (25,1)Midpoint is the effective range point of this dehydrated vegetables, measures this some upper surface distance to the product box and is all 12.25cm, and obtaining at the irradiation optimum thickness that changes dehydrated vegetables under the face irradiation technique is R
e=12.25 * 2=24.5cm.Therefore actual product is when changing face irradiation, and product box thickness should be controlled at 24.5cm just can meet the lowest dose level requirement with interior.
Embodiment two.
As shown in Figure 4.
A kind of ribbon-like electron irradiation dose index gauge is characterized in that it is made up of glass sheet 1 and flexible fixed band 2 as the quantimeter elementary cell, at least fixedly has row to be no less than three glass sheet 1 on each flexible fixed band 2.Described glass sheet 1 can be fixed on the flexible fixed band 2 by row interval or next-door neighbour, can arrange or be close to layout at interval between row and the row.Described glass sheet 1 should adopt colourless transparent glass or shallow background color clear glass.Glass sheet 1 can be simple glass sheet materials such as sheet glass, glass bottle and jar, vessel.But flexible fixed band 2 can be attachments such as cardboard, plastics, plank, cloth, as shown in Figure 4.
The part that the present invention does not relate to all prior art that maybe can adopt same as the prior art is realized.
Claims (10)
1. the assay method of an electron beam irradiation effective range is characterized in that it may further comprise the steps:
At first, sheet glass is cut into rectangular block structure as the quantimeter elementary cell of vitrifying agent flow indicator D, and but described quantimeter elementary cell is arranged in cardboard, plastics, plank or dry goods attachment surface and the fixing vitrifying agent flow indicator D that forms, can closely connect also between each quantimeter elementary cell and can be spaced, form vitrifying agent flow indicator matrix and arrange { m; N}, wherein m is the quantity of length direction quantimeter elementary cell, m 〉=3; N is the quantity of Width quantimeter elementary cell, n 〉=1, and wherein each quantimeter elementary cell note is made D
(m, n), this vitrifying agent flow indicator matrix arrangement is called " dosage index gauge band " note and makes D
(m * n)
Secondly, place the referential incident dose index gauge of an incident band D at the upper surface of irradiation products
In, in the product irradiation box, place oblique cutting at least one for the depth dose index gauge band D of the dosage that fathoms
d, and guarantee m 〉=3 that vitrifying agent flow indicator matrix is arranged, namely the quantity of the quantimeter elementary cell of length direction is no less than three, depth dose index gauge band D
dLength should be greater than reality half by the irradiation products degree of depth; Depth dose index gauge band D
dAngle between upper surface and the electron beam line is not less than 30 degree; The referential incident dose index gauge of incident band D
InDepth dose index gauge band D with the dosage that fathoms
dThe layout that should misplace guarantees not incident dose index gauge band D simultaneously of same electron beam incident ray
InWith depth dose index gauge band D
dPrepare a vitrifying agent flow indicator D without irradiation simultaneously as background reference dose index strip D
0Incident dose index gauge band D
InAnd depth dose index gauge band D
dCan place in the identical product case during greater than bandwidth at the width of product package, otherwise answer branch mailbox to place;
The 3rd, the above-mentioned product of having laid all kinds of dosage index gauge bands placed on the electron accelerator conveyer implement irradiation; According to beam energy, product box thickness and product density situation, determine whether to change face irradiation; After all the irradiation operation is finished, take out all dosage index gauge band and carry out following observation and definite effective range:
1). two-sided irradiation situation: from incident and background reference dose index gauge band D
InAnd D
0Respectively get tablet amounts index gauge stack, be designated as A; From depth dose index gauge band D
D1 (m * n)With depth dose index gauge band D
D2 (m * n)Terminal m begins, and supposes n=1, respectively gets a slice quantimeter elementary cell D
D1(m, 1)And D
D2 (m, 1) stack, be designated as B
m, compare A and B
mAberration, A-B
m0; The 2nd time from depth dose index gauge band D
D1 (m * n)With depth dose index gauge band D
D2 (m * n)Respectively get a slice quantimeter elementary cell D
D1 (m-1,1)And D
D2 (m-1,1)Stack is designated as B
M-1, compare aberration A – B
M-10 ... until aberration A – B
M-i+1=0; The i time from depth dose index gauge band D
D1 (m * n)With depth dose index gauge band D
D2 (m * n)Respectively get a slice quantimeter elementary cell D
D1 (m-i+1,1)And D
D2 (m-i+1,1)Stack is designated as B
M-i+1, compare aberration A – B
M-i＜0, and B
M-i+2＜B
M-i+1＜B
M-iThen m-i+1 tablet amounts index gauge place is electron beam to the half incident value degree of depth of test products;
Measure m-i+1 tablet amounts meter elementary cell mid point to the upper and lower inside surface distance R of product box
D1And R
D2, during two-sided irradiation, distance (R
D1+ R
D2) be electron beam under this energy to the best net thickness of test products irradiation.
2). single face irradiation situation:
From incident reference dose index gauge band D
InGet a tablet amounts index gauge, be designated as A
InFrom depth dose index gauge band D
D1 (m * n)Or depth dose index gauge band D
D2 (m * n)Terminal m begins, and supposes n=1, gets a slice quantimeter elementary cell D
D1(m, 1), be designated as B
m, compare A
InWith B
mAberration, A
In-B
m0; The 2nd time from depth dose index gauge band D
D1 (m * n)Get a slice quantimeter elementary cell D
D1 (m-1,1), be designated as B
M-1, compare aberration A
In– B
M-10 ... until aberration A
In– B
M-i+1=0; The i time from depth dose index gauge band D
D1 (m * n)Get a slice quantimeter elementary cell D
D1 (m-i+1,1), be designated as B
M-i+1, compare aberration A
In– B
M-i＜0, and B
M-i+2＜B
M-i+1＜B
M-i,Then m-i+1 tablet amounts index gauge place equals the corresponding thickness of absorbed dose with electron beam incidence surface place for the product absorbed dose;
Measure m-i+1 tablet amounts meter elementary cell lower limb far point to the distance R of product box upper inner surface or following inside surface
D1, during single face irradiation, distance R
D1Be electron beam under this energy to the best net thickness of test products irradiation.
2. the assay method of electron beam irradiation effective range according to claim 1, the length that it is characterized in that described vitrifying agent flow indicator are to treat half 1.414 times of the irradiation products degree of depth.
3. the assay method of electron beam irradiation effective range according to claim 1 is characterized in that described depth dose index gauge band D
d: respectively at the plane of incidence and 2 above dosage index gauge bands of incident opposite direction oblique cutting in product, its dosage index gauge face and electron beam line form the above angle of 30 degree; Open with incident reference dose index gauge tape error.
4. the assay method of electron beam irradiation effective range according to claim 1 is characterized in that product box is at the irradiation optimum thickness R that changes under the face irradiation technique
D1+ R
D2
5. the assay method of electron beam irradiation effective range according to claim 1 is characterized in that the length of described rectangular block quantimeter elementary cell is at least 3 times of width in order to improve the observation degree of accuracy and to reduce range error.
6. the assay method of electron beam irradiation effective range according to claim 1 is characterized in that for the low dose irradiation product, and the dosage index gauge band that adopts thickness to make in the quantimeter elementary cell below 2 millimeters carries out irradiation, multilayer stack observation.
7. the assay method of electron beam irradiation effective range according to claim 1, it is characterized in that for the even complex product of density unevenness, depth dose index gauge band should be divided into several sections and place irradiation, corresponding point stack observation is to obtain the electron beam effective range at each position of product.
8. the stripe electron beam irradiation dose index gauge that uses of the described method of a claim 1, it is characterized in that it is made up of glass sheet (1) and flexible fixed band (2) as the quantimeter elementary cell, at least fixedly have row to be no less than three glass sheet (1) on each flexible fixed band (2).
9. stripe electron beam irradiation dose index gauge according to claim 8 is characterized in that described glass sheet (1) is fixed on the flexible fixed band (2) by row interval or next-door neighbour, should arrange between row and the row at interval.
10. stripe electron beam irradiation dose index gauge according to claim 8 is characterized in that described glass sheet (1) is colourless transparent glass or the transparent simple glass of shallow background color.
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| CN112146601B (en) * | 2019-06-27 | 2021-07-16 | 清华大学 | Radiation imaging method and device based on dose field detection |
| WO2020259368A1 (en) | 2019-06-27 | 2020-12-30 | 清华大学 | Article dose distribution measurement method and apparatus |
| CN112485821B (en) * | 2020-11-19 | 2022-09-30 | 上海束能辐照技术有限公司 | Method for rapidly measuring beam energy of electron accelerator |
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