CN1727881A - Technique for detecting radiation dose of photoproduced fluorescence - Google Patents
Technique for detecting radiation dose of photoproduced fluorescence Download PDFInfo
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- CN1727881A CN1727881A CN 200510086189 CN200510086189A CN1727881A CN 1727881 A CN1727881 A CN 1727881A CN 200510086189 CN200510086189 CN 200510086189 CN 200510086189 A CN200510086189 A CN 200510086189A CN 1727881 A CN1727881 A CN 1727881A
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Abstract
The present invention relates to a kind of technique for detecting radiation dose of photoproduced fluorescence, the photoluminescence characteristic of the alkaline earth sulfide of two kinds of rare earth element of this technology utilization doping, by photoluminescence dosage sheet storage radiation dose, with the light source activation in the electro-optical system, and read the radiation dose of storing in the flourescent sheet with sensitive weak light detection device, obtain a kind of novel radiation dose measurement technology.This technology comprises radiosensitive fluorescence material (alkaline earth sulfides of the two kinds of rare earth element of mixing), photoluminescence radiation dose sheet and carries out the employed detecting devices of radiation dose measurement, is applicable to the measurement of the dosage of gamma-rays, electron beam irradiation, X ray etc.This commercial measurement wide ranges, highly sensitive; The radiation dose of storage is removed with the internal light source irradiation, and equipment is simple relatively, volume is little, low in energy consumption.This surveying instrument is well suited for space online in real time radiation dose and surveys, and can also be used for the integrated circuit radiation in addition, has obtained good effect.
Description
Technical field
The present invention is a kind of photoluminescence ionizing radiation dose Detection Techniques, relates to semiconductor physics, solid radiation physics, radiation dosimetry and electronic technology field.
Background technology
Nineteen fifty-five, Soviet Union's scientist Rome promise Paderewski has proposed to use to the light activated SrS:Eu of far infrared for the first time, Sm makes the suggestion of dosimeter for slit radiographic apparatus, and it is defined as photoluminescence (Optically Stimulated Luminescence, OSL) quantimeter.Owing to measure the problem that aspects such as sensitivity and measuring method exist, simultaneously also because the developing rapidly of thermoluminescent dosemeter (TLD), until the eighties, photoluminescence has just had aspect radiation dose measurement and has further developed.External also favourable in recent years with the report of fluorescence material as radiosensitive material preparation agent amount meter.
Fluorescence material by irradiation such as gamma-rays, X ray, high-power electron beams after, electronics on the valence band is excited to conduction band, captured by the trap level in the forbidden band, after infrared light irradiation that material is subjected to certain wavelength excites, electronic transition in the trap is to conduction band, and the luminescent center in the last and forbidden band is compound, sends the fluorescent photon of certain wavelength coverage, the size of luminous quantity has 7 order of magnitude dynamic ranges, the principle of luminosity of Here it is fluorescence material.
The detection principle of the various space radiation detectors that use is not quite similar at present, be to utilize ionization and the excitation of ionising radiation to material atom mostly, radiation dose commonly used is in respect of ionization chamber, chemical dosimeter, thermoluminescent dosemeter, film dosimeter, semiconductor PMOS quantimeter etc.
Domestic does not still have at present the experiment that utilizes fluorescence material to carry out radiation dose measurement and reports.
The present invention utilizes the photoluminescence characteristic of the alkaline earth sulfide material of the two kinds of rare earth element of mixing, and carries out the measurement of radiation dose, has obtained good effect.Can be used for space radiation dosage online in real time and measure, satisfy volume requirement little, in light weight, low in energy consumption.
Summary of the invention
The object of the invention is, a kind of technique for detecting radiation dose of photoproduced fluorescence is provided, and the photoluminescence characteristic of the alkaline earth sulfide of two kinds of rare earth element of this technology utilization doping obtains a kind of novel radiation dose measurement technology.This technology comprises radiosensitive fluorescence material (alkaline earth sulfides of the two kinds of rare earth element of mixing), photoluminescence radiation dose sheet and carries out the employed detecting devices of radiation dose measurement.The present invention utilizes the alkaline earth sulfide of the two kinds of rare earth element of mixing to carry out radiation dose measurement, has obtained good effect.This material is by the two kinds of rare earth element D1 that mix in broad-band gap II-VI compounds of group, D2 is prepared from, wherein a kind of element D1 (dominant activator) is as the photoluminescence center, another kind of element D2 (auxiliary activator) forms trap level in host material, because rare earth element has the 4F shell of underfill, and the 4F electronics is by outer 5S
2, 5P
6The characteristic of electronic shield makes it have quite complicated class line-spectra and peculiar optical property.The principle of luminosity of this fluorescence material utilizes its this performance just, can prepare well behaved photoluminescence radiation estimator.Fact proved: the alkaline earth sulfide with the two kinds of rare earth element of mixing carries out radiation dose measurement, and it is highly sensitive, can survey the radiation dose wide ranges, and volume is little, and it is low to consume energy, and zero clearing is simple, can be used for space online in real time actinometry.
A kind of technique for detecting radiation dose of photoproduced fluorescence of the present invention, this technology comprises fluorescence material, photoluminescence radiation dose sheet and carries out the employed detecting devices of radiation dose measurement, carries out the measurement to gamma-rays, X ray, high-power electron beam radiation dose; Wherein fluorescence material is the alkaline earth sulfide RS:X of doped with rare-earth elements, and R is a kind of element in alkaline earth metals calcium, strontium, the barium, and X is two kinds in samarium, cerium, the europium; Photoluminescence radiation dose sheet is that the photoinduced fluroscence powder with the alkaline earth sulfide of doped with rare-earth elements is dispersed in printing opacity good the transparency material potassium bromide or organic glass, adopt the pressure sintering of routine to make photoluminescence dosage sheet or modulate organic glass glue with chloroform earlier, add fluorescent powder again and modulate potpourri, after treating the chloroform volatilization, make photoluminescence dosage sheet; Carry out the employed detecting devices of radiation dose measurement and be made up of power supply, controlled light source driving circuit, light source, test platform, optical sensor, signal amplification circuit, signal output and recording storage output system, light source is infrared light diode or laser diode; Optical sensor is gallium arsenic phosphide photodiode or PIN type photodiode or gallium phosphide diode; Signal amplification circuit adopts one or more levels operational amplification circuit amplifying signal.
The fluorescent powder of the alkaline earth sulfide of doped with rare-earth elements excites with wavelength 850～1200nm infrared light through behind the irradiation, sends the visible light of wavelength 400～600nm.
The present invention elder generation behind gamma-ray irradiation, shines with infrared light the photoluminescence sheet to it, material can send fluorescence.After same flourescent sheet is carried out the radiation dose of a series of varying strengths, shine with infrared light, the light intensity semi-invariant and the irradiation dose of its emission have good linear relationship.The voltage that this light intensity provides by opto-electronic conversion and amplification system converts and draws.
Photoluminescence radiation dose sheet is fluorescence material to be distributed in the good medium of a kind of printing opacity uniformly go.This transparent medium is organic glass or potassium bromide.
When doing matrix with organic glass, method one: need preparation organic glass glue earlier, with organic glass particle and alcohol according to 1: the mass ratio of 10-30 mixes, best mass ratio is 1: 15-20, mix back preceding 3 hours every stirring in 30 minutes 3 minutes, sealing was left standstill 24 hours then, can obtain well behaved organic glass glue; According to photoinduced fluroscence powder and 1: 100 mass ratio of organic glass glue, photoinduced fluroscence powder slowly joined in the organic glass glue go, need continuous stirring simultaneously, after treating evenly potpourri is put into the open mold of making in advance, bore dia in the middle of the mould can be between 6-15mm, the thickness of putting into glue is between 3-4mm, and opening is placed and can be obtained well behaved photoluminescence radiation dose sheet in 24-48 hour.
Method two: lucite powder is further pulverized, with photoinduced fluroscence powder by 4-6: 1 mixes and puts into the mould that internal diameter is 8mm, then mould is put into hot pressing furnace, pressurization 5～-30kg/cm
2, furnace temperature is raised to 250-400 ℃, is incubated 10～-30 minutes, and the cooling back demoulding then obtains the bar that diameter is 8mm, and it is that the thin slice of 1.2mm promptly obtains well behaved photoluminescence radiation dose sheet that this bar is cut into thickness.Other organic material that can be used for doing matrix all can be made of this pressure sintering, and fibrous root is determined the temperature of hot pressing furnace according to the fusing point of the organic material of matrix.
When doing matrix with potassium bromide, earlier potassium bromide in drying in oven, mix according to 6: 1 alkaline earth sulfide fluorescence materials again and put into mortar two kinds of rare earth element of potassium bromide and doping, ground 10-30 minute, then mixed uniformly abrasive material is put into mould, pressurization 50～200kg/cm
2, evenly be coated with the thick organic glass glue of one deck 0.8mm on the surface behind the taking-up slice, thin piece, treat can use after the organic glass glue drying;
The employed detecting devices of radiation dose measurement is made up of power supply, controlled light source driving circuit, light source, test platform, sensitive photodetection sensor, signal amplification circuit, signal output and recording storage output system, and this detecting devices can be good reads the suffered radiation dose of flourescent sheet.
The employed detecting devices of radiation dose measurement
Power unit
This power supply can be light source driving circuit stable+5V DC voltage is provided, for signal amplification circuit provides stable ± 5V DC voltage.We have adopted dual transformer transformation structure in circuit, have guaranteed ± the stable output of 5V alternating voltage that the filtering voltage regulation device has guaranteed the stable of DC voltage.
Infrared light light source and controlled light source driving circuit
Light source is an infrared light, is provided by laser diode.The luminance of the light source driving circuit control laser diode when controlled, at present, luminance has two kinds of settings, a kind of is that pulsed is luminous, another kind is that continous way is luminous, the adjustable extent of fluorescent lifetime broad, and the time range of equipment adjusting at present can be from 5s-60s.
Optical sensor and signal amplification circuit
Because the light intensity of flourescent sheet stimulated light emission changes in a very big scope, thus need very sensitive photodetection sensor, and the amplifying circuit that can amplify ultra-weak electronic signal.The spectrographic detection wave band of optical sensor will have identical preferably with the wave band of flourescent sheet emitting fluorescence.Light signal by optical sensor and amplifying circuit after, light signal becomes the voltage signal output that can survey.
When adopting the one-level amplifying circuit, when the feedback resistance that discharge circuit is selected for use was 5.6M Ω, the single-stage enlargement factor can reach 466 times.
Because certain dark current is arranged, add inevitably a small amount of external interference, there is certain background voltage signal to exist, through repeatedly measuring, can get the background average voltage, in actual measurement, measurement result be deducted the background average voltage, external interference minimum be can be reduced to, precision and the detectable lower limit surveyed improved simultaneously.
Because radiation dose hour, signal is very faint, so need amplifying circuit that the ability of good anti-external interference is arranged.The present invention has taked multiple measure to solve this problem.
Light source driving circuit and amplifying circuit are placed on respectively on two circuit boards, earlier amplifying circuit is enclosed in the little can, light source driving circuit, light source, test platform, sensitive photodetection sensor, small signal amplification circuit are placed in the canister that covers light, power unit places the canister outside again.Inner light source extension line, optical sensor extension line, outgoing cable will add shielding, and shielding line is wanted ground connection.
Test platform
Test platform is used for placing photoluminescence sheet, light source and optical sensor.The photoluminescence sheet is fixed on the platform, light source and optical sensor are fixed on the same side of photoluminescence sheet, the angle of light source and optical sensor is between 30 °-120 °.
Signal acquisition process and output
Signals collecting is undertaken by the sensitive voltage table of band gpib interface, by the computer control gatherer process, and writes down the data of being gathered, and controls the required program of whole process and writes according to actual needs.
Data acquiring frequency has ten patterns, and frequency acquisition can be made as: 0.15,0.30,0.60,1.20,2.41,4.83,5.49,10.7,21.2,40 time/S.
In a certain stipulated time, as 10 seconds, frequency acquisition was made as per second 4.83 times, obtained measured value altogether 48 times.With the magnitude of voltage V that gathers at every turn
iDeduct background average Δ V, then the magnitude of voltage V of addition gained
Always, (light intensity is corresponding with magnitude of voltage), the total voltage value V of magnitude of voltage addition gained
AlwaysCorresponding with total light yield, thus corresponding with total irradiation dose D.Find accumulation magnitude of voltage V by repeatedly measuring
AlwaysThe irradiation dose D that accepts with flourescent sheet presents good linear relationship.
Description of drawings
Fig. 1 is the luminescence mechanism figure of fluorescence material of the present invention
Fig. 2 is a photoluminescence radiation dose detecting devices synoptic diagram of the present invention
Embodiment
Embodiment 1
Selecting the alkaline earth sulfide of fluorescence material doped with rare-earth elements is CaS:Ce, Sm;
Do matrix with organic glass, prepare organic glass glue earlier, with organic glass particle and chloroform according to 1: the mass ratio of 10-30 mixes, best mass ratio is 1: 15-20, mix back preceding 3 hours every stirring in 30 minutes 3 minutes, sealing was left standstill 24 hours then, can obtain well behaved organic glass glue; According to photoinduced fluroscence powder and 1: 100 mass ratio of organic glass glue, photoinduced fluroscence powder slowly joined in the organic glass glue go, need continuous stirring simultaneously, after treating evenly potpourri is put into the open mold of making in advance, bore dia in the middle of the mould can be between 6-15mm, the thickness of putting into glue is between 3-4mm, and opening is placed and can be obtained well behaved photoluminescence radiation dose sheet in 24-48 hour;
Carry out the employed detecting devices of radiation dose measurement and be made up of power supply, controlled light source driving circuit, light source, test platform, optical sensor, signal amplification circuit, signal output and recording storage output system, light source is the infrared light diode; Optical sensor is a PIN type photodiode; Signal amplification circuit adopts one-level operational amplification circuit amplifying signal; The radiation dose probe portion is placed in the unknown radiation field, to system's energising, makes light source luminescent carry out zero clearing to the photoluminescence sheet by triggering earlier, the fluorescent lifetime of controllable light source is made as 10S, and per second is gathered 4.83 times.In radiation field, left standstill 10 minutes, and triggered then that light source is begun was luminous, the irradiation flourescent sheet, optical sensor and amplifying circuit are started working simultaneously, are begun to gather the magnitude of voltage V of every bit by computing machine
i, after collection finishes, with the magnitude of voltage V that gathers at every turn
iDeduct background average Δ V, calculate accumulation magnitude of voltage V
Always, obtain the integral dose value D that flourescent sheet is accepted in this time period by the dose response curve of prior demarcation.
Embodiment 2
Selecting fluorescence material doped with rare-earth elements alkaline earth sulfide is CsS:Sm, Eu;
When doing matrix with potassium bromide, elder generation in drying in oven, mixes potassium bromide and puts into mortar according to 6: 1 alkaline earth sulfides with the potassium bromide and the two kinds of rare earth element of mixing, ground 10-30 minute, then mixed uniformly abrasive material is put into mould, pressurization 50-200kg/cm
2, evenly be coated with the thick organic glass glue of one deck 0.8mm on the surface behind the taking-up slice, thin piece, treat can use after the organic glass glue drying;
Carry out the employed detecting devices of radiation dose measurement and be made up of power supply, controlled light source driving circuit, light source, test platform, optical sensor, signal amplification circuit, signal record storage output system, light source is a laser diode; Optical sensor is the gallium phosphide diode; Signal amplification circuit adopts multistage operations amplifying circuit amplifying signal; The radiation dose probe portion is placed in the unknown radiation field,, makes light source luminescent carry out zero clearing by triggering earlier the photoluminescence sheet to system's energising.The fluorescent lifetime of controllable light source is made as 15S, and per second is gathered 5.49 times.In radiation field, left standstill 30 minutes, and triggered then that light source is begun was luminous, the irradiation flourescent sheet, optical sensor and amplifying circuit are started working simultaneously, are begun to gather the magnitude of voltage V of every bit by computing machine
i, after collection finishes, with the magnitude of voltage V that gathers at every turn
iDeduct background average Δ V, calculate accumulation magnitude of voltage V
Always, obtain the integral dose value D that flourescent sheet is accepted in this time period by the dose response curve of prior demarcation.
Embodiment 3
Selecting the alkaline earth sulfide of fluorescence material doped with rare-earth elements is BaS:Eu, Ce;
Lucite powder is further pulverized, with photoinduced fluroscence powder by 4-6: 1 mixes and puts into the mould that internal diameter is 8mm, then mould is put into hot pressing furnace, pressurization 5～30kg/cm
2, furnace temperature is raised to 250～400 ℃, is incubated 10～30 minutes, and the cooling back demoulding then obtains the bar that diameter is 8mm, and this bar is cut into the thin slice that thickness is 1.2mm, the photoluminescence radiation dose sheet that available can be good;
Carry out the employed detecting devices of radiation dose measurement and be made up of power supply, controlled light source driving circuit, light source, test platform, optical sensor, signal amplification circuit, signal output and recording storage output system, light source is a laser diode; Optical sensor is the gallium arsenic phosphide photodiode; Signal amplification circuit adopts multistage operations amplifying circuit amplifying signal; The measurement of unknown radiation field radiation dose rate d: radiation detection partly is placed in the unknown radiation field t writing time of elder generation
1, after after a while, begin to read the radiation dose value of accumulation, simultaneously writing time t
2, calculate accumulation magnitude of voltage V
Always, obtain the integral dose value D that flourescent sheet is accepted in this time period by the dose response curve of prior demarcation.According to following formula:
d＝D/(t
2-t
1)
Can calculate the dose rate of this radiation field.
Claims (2)
1, a kind of technique for detecting radiation dose of photoproduced fluorescence, it is characterized in that this technology comprises fluorescence material, photoluminescence radiation dose sheet and carries out the employed detecting devices of radiation dose measurement, carries out the measurement to gamma-rays, X ray, high-power electron beam radiation dose; Wherein fluorescence material is the alkaline earth sulfide RS:X of doped with rare-earth elements, and R is a kind of element in alkaline earth metals calcium, strontium, the barium, and X is two kinds in samarium, cerium, the europium; Photoluminescence radiation dose sheet is that the photoinduced fluroscence powder with the alkaline earth sulfide of doped with rare-earth elements is dispersed in printing opacity good the transparency material potassium bromide or organic glass, adopt the pressure sintering of routine to make photoluminescence dosage sheet or modulate organic glass glue with chloroform earlier, add fluorescent powder again and modulate potpourri, after treating the chloroform volatilization, make photoluminescence dosage sheet; Carry out the employed detecting devices of radiation dose measurement and be made up of power supply, controlled light source driving circuit, light source, test platform, optical sensor, signal amplification circuit, signal output and recording storage output system, light source is infrared light diode or laser diode; Optical sensor is gallium arsenic phosphide photodiode or PIN type photodiode or gallium phosphide diode; Signal amplification circuit adopts one or more levels operational amplification circuit amplifying signal.
2, by the described technique for detecting radiation dose of photoproduced fluorescence of claim 1, the fluorescent powder of alkaline earth sulfide that it is characterized in that doped with rare-earth elements is through behind the irradiation, excite with wavelength 850～1200nm infrared light, send the visible light of wavelength 400～600nm.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1995996B (en) * | 2006-12-27 | 2011-04-20 | 中国科学院物理研究所 | Quasicontinuous or continuous laser angle-resolved photoelectron spectrum analyzer |
| CN104267056A (en) * | 2014-10-15 | 2015-01-07 | 苏州工业职业技术学院 | X-ray fluorescence tester for testing heavy metal pollution of soil |
| CN106199372A (en) * | 2016-07-04 | 2016-12-07 | 中国科学院新疆理化技术研究所 | X-ray irradiation test equipment for the test of wafer scale device radiation effect |
| CN110850465A (en) * | 2019-10-31 | 2020-02-28 | 中国原子能科学研究院 | Portable β ray irradiator for field calibration of photoluminescence fluorescence dosimeter |
| CN111830550A (en) * | 2020-06-04 | 2020-10-27 | 中国科学院上海应用物理研究所 | Metal organic hybrid lattice material and application thereof in irradiation source detection |
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2005
- 2005-07-23 CN CN 200510086189 patent/CN1727881A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1995996B (en) * | 2006-12-27 | 2011-04-20 | 中国科学院物理研究所 | Quasicontinuous or continuous laser angle-resolved photoelectron spectrum analyzer |
| CN104267056A (en) * | 2014-10-15 | 2015-01-07 | 苏州工业职业技术学院 | X-ray fluorescence tester for testing heavy metal pollution of soil |
| CN106199372A (en) * | 2016-07-04 | 2016-12-07 | 中国科学院新疆理化技术研究所 | X-ray irradiation test equipment for the test of wafer scale device radiation effect |
| CN110850465A (en) * | 2019-10-31 | 2020-02-28 | 中国原子能科学研究院 | Portable β ray irradiator for field calibration of photoluminescence fluorescence dosimeter |
| CN111830550A (en) * | 2020-06-04 | 2020-10-27 | 中国科学院上海应用物理研究所 | Metal organic hybrid lattice material and application thereof in irradiation source detection |
| CN111830550B (en) * | 2020-06-04 | 2022-09-13 | 中国科学院上海应用物理研究所 | Metal organic hybrid lattice material and application thereof in irradiation source detection |
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