109 results about "Thermoluminescence" patented technology

Described is a multi-sensor radiation dosimeter system with (1) a self-indicating, instant radiation sensor and (2) a conventional radiation sensor for monitoring high energy radiations, such as X-ray, electrons and neutrons. Conventional radiation sensors, such as X-ray film, TLD (Thermoluminescence Dosimeters), RLG (Radioluminescence Glass) and OSL (Optically Simulated Luminescence), are highly sensitive but are not instant. In the event of a dirty bomb, nuclear detonation or a radiological accident, one needs to know the exposure instantly so proper precautions can be taken and medical treatment, if required, can be given to the victim. If a self-indicating instant sensor is one of the sensors, one would know the dose instantly, and dose can be determined with higher accuracy than by the traditional methods. This type of device offers the best of both technologies.

A thermoluminescence (TL) dosimetry (TLD) system comprises at least one TLD element that is controllably heated and which temperature is monitored in real time using an infrared (IR) radiometry subsystem that provides respective IR radiation inputs to a control subsystem. The control subsystem uses the inputs to effect the heating control. The TLD system further comprises a TL measuring subsystem for measuring TL emission data from each heated TLD element, the TL data used in obtaining a does curve indicative of the total radiation to which the TLD element has been exposed.

Disclosed is a growth method of carbon-doped sapphire crystal through a guided mode method, which is characterized in that the guide mode method and a molybdenum-die are adopted for the growth of Alpha-Al2O3:C crystals. The alumina block with a certain weight through the high temperature sintering is disposed in a crucible of the molybdenum guided mode die, loaded inside a pulling furnace that is in vacuum-pumping to 10<-3> to 10<-4>Pa. Through the resistance heating, the temperature is continuously increased to 2050 to 2100 DEG C and then in constant temperature for 0.5 to 1 hour. Afterwards, the seed crystals are used for the growth of Alpha-Al2O3:C crystals. The Alpha-Al2O3:C crystals obtained from the growth are disposed in an annealing furnace of 1000 to 1500 DEG C under an atmosphere of hydrogen to preserve the heat for 50 to 100 hours. With the invention, the Alpha-Al2O3:C crystals with excellent thermoluminescence and optically stimulated luminescence properties can rapidly grow. Therefore, the invention can be applied in the manufacturing of highly sensitive thermoluminescence and optically stimulated luminescence detector.

The invention belongs to the dosimeter calibration technology field, and discloses a gamma ray irradiation device used for thermoluminescence personal dosimeter calibration. The irradiation device comprises an irradiation system, a positioning system, a transmission system, and a control system. The irradiation system, the positioning system, and the transmission system are disposed in the same housing. The irradiation system is disposed on the upper part of the transmission system, and the positioning system is disposed on one side of the transmission system. The control system comprises a computer, a PLC special controller, a positioning sensor, and an irradiation controller. The computer and the PLC special controller are used to independently realize the control over the gamma ray irradiation device, and the positioning, the transmission, and the irradiation of the thermoluminescence personal dosimeter are realized automatically. The gamma ray irradiation device has advantages of high calibration efficiency, low calibration place requirement, good automatic shielding effect, and ability of realizing automatic calibration.

The invention provides a method of searching for hidden uranium mine in a granite area. The method comprises: S1, determining a preliminary measurement point in a surveying area; S2, measuring uranium, thorium and potassium contents of a ground gamma-ray energy spectrum, the radon gas concentration of the surface soil or the thermoluminescence intensity of the surface soil, and a uranium component content in the surface soil at a preliminary measurement point; S3, making profile maps and planar contour maps of all measurement parameters as well as an integrated profile map and an integrated planar contour map; S4, determining and setting an abnormal prediction zone; S5, determining a final measurement point in the abnormal prediction zone; S6, measuring uranium, thorium and potassium contents of the ground gamma-ray energy spectrum, the radon gas concentration of the surface soil or the thermoluminescence intensity of the surface soil, and a uranium component content in the surface soil at the final measurement point; S7, making profile maps and planar contour maps of all measurement parameters as well as an integrated profile map and an integrated planar contour map; S8, determining and setting an abnormal prediction zone; and S9, carrying out engineering revealing. With the method provided by the invention, the searching work hit rate and the work efficiency for searching for hidden uranium mine in a granite area are improved and the mine searching cost is lowered.

The invention relates to gallium oxide crystals with thermoluminescence performance and a preparation method thereof. The gallium oxide crystals comprise gallium oxide and Ge4+ doped in gallium oxide, and the doping concentration preferably ranges from 0.1 mol% to 10 mol%. The gallium oxide crystals are prepared through a mode guide method. Compared with the prior art, the germanium-doped gallium oxide crystals have the good thermoluminescence performance, and the Ge4+ doping concentration can be controlled. A mixed atmosphere of Ar and CO2 is adopted, Ar gas and CO2 gas introduced at different stages are combined, decomposition and volatilization of the gallium oxide crystals in the growing process are effectively restrained, and the crystals are short in growth period and low in cost.

The invention discloses an optical polarization converter and a manufacturing method thereof. The optical polarization converter comprises a polarization beam splitter, a first half-wave plate, a second half-wave plate and a polarization beam combiner. The optical polarization converter is a thermoluminescence type polarization converter, a phase delay unit is introduced by changing the temperature of a silicon dioxide optical waveguide, the light intensity of two beams of polarized light is distributed in any proportion through a combination device of a tunable coupler and a phase shifter, and the polarization state of light is further accurately converted in real time. The manufacturing method of the optical polarization converter comprises the following steps of: (1) cutting a silicon wafer; (2) cleaning the silicon wafer; (3) thermally oxidizing the silicon wafer; (4) directly writing an optical waveguide and a micro photon device; and (5) manufacturing a micro-thin film heating electrode. The optical polarization converter has the advantages of low loss, simplicity and accuracy in manufacturing, high integration degree, small driving voltage and low power consumption, and can be used for accurately converting the polarization state of the light in real time.

The invention relates to a europium and samarium-doped lithium magnesium phosphate photostimulated luminescent material and a preparation method thereof. The chemical formula of the material is LiMgPO4: Eu, Sm, B, and the specific preparation method comprises the following steps of: mixing and grinding raw materials, namely lithium hydroxide, magnesium nitrate, ammonium dihydrogen phosphate, boric oxide, europium oxide and samarium oxide, loading into a porcelain crucible made of an aluminum oxide material, placing into a high-temperature sintering furnace for performing sectional constant-temperature sintering, and further cooling the aluminum oxide crucible to room temperature to obtain the europium and samarium-doped lithium magnesium phosphate LiMgPO4: Eu, Sm, B photostimulated luminescent material. The material is of an olivine type structure, the space group is Pnma, the lattice constants are as follows: a=10.147., b=5.909. and c=4.692., and the doping of europium and samarium does not change the basic structure of the LiMgPO4 material; and the thermoluminescence performance of the material is greatly upgraded, the sensitivity and the stability in storage of radiation dose information are effectively improved, the addition of the samarium oxide upgrades the luminescence performance of rare earth europium ions, and the material has low environmental pollution and low cost and can be applied to environments, medicines and offline and real-time online measurement of human body radiation doses.

The present invention relates to a self-activating light-emitting material capable of responding to multiple stimulations such as light stimulation, heat stimulation and force stimulation, and a preparation method thereof, wherein the chemical expression formula of the material is CaxZnyOS, x is more than 0.9 and is less than 1, and y is more than 0.9 and is less than 1. The self-activating light-emitting material of the present invention can emit bright pink light under the excitation of 250-300 nm ultraviolet light, can emit bright green light under the excitation of 325-350 nm ultraviolet light, has thermoluminescence performance under thermal stimulation, has stress luminescence performance under the actions of friction, collision, ultrasound and compression, can emit green visible light, and is the self-activating functional light-emitting material capable of responding to multiple stimulations such as light stimulation, heat stimulation and force stimulation.

The invention relates to a method of growing a carbon-mixed sapphire crystal, is characterized in that the method of targeted gradient temperature is adopted to grow the Alpha-Al2O3: C crystal. The process flow is as follows: firstly, a certain qualitative amount of Alpha-Al2O3 is weighed and then graphite of 100 to 5,000 ppm is added in and stirred to mix well; secondly, oriented sapphire seed crystals are placed in the seed crystal tank of the molybdenum crucible in the temperature gradient furnace and the well-mixed powder lot is put into the crucible evenly and then the crucible is covered; and thirdly, the crucible is placed in the furnace. The furnace is vacuumized to be 5 by 10<-3>Pa, persistently overheated to be 2,080 DEG Cand kept constant for 0.5 to 1 hour and then the temperature is reduced to the room temperature at a velocity of 3 to 5 DEG C per hour and then the furnace mantle is unclosed to take out the crystal. The Alpha-Al2O3: C crystal directly grown in the invention has excellent thermoluminescence capability and high crystal quality, which can be used for manufacturing highly-sensitive thermoluminescent detectors.

The invention discloses a device and a method for measuring ambient temperature variation on the basis of measurement of nonmetal crystal mineral charge distribution. The device comprises a sample cavity, a thermal activation unit, a photoelectric conversion detection unit and an analytical unit; the sample cavity is used for loading samples; the thermal activation unit is used for activating the samples in the sample cavity through heating, so that the samples release thermoluminescence; the photoelectric conversion detection unit is used for converting the thermoluminescence signals which are sent out by the samples into electrical signals; and the analytical unit is used for reading the electrical signals of the photoelectric conversion detection unit, analyzing the thermoluminescence emitting characteristics of the samples and comparing with the thermoluminescence emitting characteristics of the same type of samples which are irradiated by X-rays, ultraviolet light or isotopic radioactive sources and have known heating histories, and thus, the heating temperature variation histories of the samples can be estimated. After the device is utilized, the heating histories and temperature variation histories of the samples can be measured in a non-scene mode according to the method disclosed by the invention.

The invention relates to a thermoluminescent irradiator as one part of a thermoluminescence measuring system, and belongs to the technical field of auxiliary apparatuses of radiation equipment. The thermoluminescent irradiator, which serves as a key apparatus used in cooperation with a thermoluminescence dosimeter, comprises a main body 1, a circular disc 2, a sample disc 3, an irradiation source4, a stepping motor 5, an upper cover 6, a display screen 7 and a keyboard 8. The thermoluminescent irradiator irradiates annealed thermoluminescent elements to screen the thermoluminescent elements and scale a thermoluminescent reader. During use, parameters are set according to the needed irradiation dosage, so that multiple thermoluminescent dosage elements can be placed once.

The invention belongs to the technical field of thermoluminescence measurement, and especially relates to a calibrating device for a thermoluminescence dosimeter. The calibrating device comprises a main body, a display screen, a keyboard, a drawer, a thermoluminescence detector, a handle, a measuring disc and a calibration light source. A light avoidance requirement in a measuring process is met,and it is ensured that a thermoluminescence probe measures the dosimeter and a standard light source under the same condition. Measuring errors caused by sensitivity change and zero drift of a photomultiplier and circuit during long-term work of apparatuses are corrected, and thus, the measuring accuracy and stability are improved. The dosimeter and standard light source are measured in a relatively independent but time interleaved way, and measurement is more effectively.

The invention consists of equipment and a process, based on ionizing radiation dosimeters, whereby one or several of these dosimeters are placed in the patient. The identity of these dosimeters, and the information collected by them are entered in a computer system, which applies an algorithm to determine the surface dose and estimate the dose in organs.The preferred embodiment is described, in which the dosimeter is based on the thermoluminescence principle, and also includes a dosimeter identifier, a dosimeter reader, the software, and the process for handling the dosimeters and the information.

The invention relates to a low temperature X ray induced thermoluminescence spectrum measuring device. The low temperature X ray induced thermoluminescence spectrum measuring device comprises an X ray source, a temperature control unit, and a sample stage, a light collecting system, and a grating spectrometer which are arranged in the temperature control unit; the temperature control unit comprises a thermal-insulation housing, and a temperature sensor and a heating refrigerator which are arranged in the thermal-insulation housing. According to the low temperature X ray induced thermoluminescence spectrum measuring device, the grating spectrometer is introduced, a reflective blazed flat-field grating is adopted by the grating spectrometer to realize dispersion of optical signals, an imaging sensor is used for capturing full spectrum wavelength signal light spectrum at one time, spectrum acquisition time period is extremely short (as short as 1ms), spectrum real-time acquisition is realized, spectrum repeatability is high, utilization of some instantaneous characteristics of optical signals is realized, device whole size is reduced, and device whole power consumption is reduced.

The invention discloses an insulation dielectric film solid-state light-emitting device light emission enhancing method and describes the principle of light emission enhancement. A solid-state light-emitting device is composed of a signal electrode, a back electrode, and light-emitting units. Each light emitting unit is a MOS structure composed of a plurality of layers of thin films, each thin film is made of different materials or different technological parameters, and the physical properties of the films are different. When a voltage is applied to the thin films, the oxygen defects in the dielectric layer film form a continuous conductive channel to realize thermoluminescence. A layer of Ti thin film having the thickness of 1-2nm is added into the dielectric layer film to make the dielectric layer generate more oxygen defects, so that the light-emitting brightness is enhanced, the energy consumption is reduced, and the light-emitting efficiency is improved.

The invention relates to a heating luminous anti-radiation fabric which comprises a luminous layer, an anti-radiation layer and an infrared fiber layer, wherein the anti-radiation layer is arranged between the heating layer and the infrared fiber layer; thermoluminescence crystals are attached to the warps and wefts of the luminous layer; the anti-radiation layer has a jacquard structure; and the infrared fiber layer is made from a blended fabric. The heating luminous anti-radiation fabric provided by the invention has excellent anti-radiation performance and shielding performance, can emit light by use of the heat energy generated by friction, and can heat.

The invention provides preparation of a composite double-functional perovskite material with joint thermoluminescence and photoluminescence properties. The preparation has the advantages that by adopting the inorganic-organic perovskite nanometer material, the size, shape and component proportional ratio are adjusted to control the photoluminescence area, thereby realizing the broad-spectrum transmission of 400 to 900nm; by adopting the composite modifying of thermally-induced crystals, the light emitting efficiency of various colors can reach 80% or above, and the light emitting efficiency ofred color can reach 90%; perovskite quantum dots and the thermoluminescence crystals form a core-shell nanometer structure, and the particle size and film thickness of the core-shell nanometer layerare adjusted and controlled, so that the property of the material can be effectively adjusted, the stability is high, the reflectivity is high, and the light emitting property is high; the high radiation heat of an LED (light emitting diode) chip semiconductor is effectively utilized, the heat loss of LED is further reduced, and the light emitting efficiency and light strength are improved.

The invention relates to thermoluminescence shell fabric spliced clothes provided with a temperature detecting device and used for patients. The thermoluminescence shell fabric spliced clothes comprise a clothes front part (1), a clothes rear part (2) and two sleeves (3), wherein the clothes front part (1) and the clothes rear part (2) are connected by zippers (4), the sleeves (3) are connected with the clothes front part (1) and the clothes rear part (2) through annular zippers (5), the clothes front part (1) is provided with sandwich layers (6) at the armpits; an infrared temperature detector (7), a CPU (central processing unit) (8) and a GSM module (9) are arranged in the sandwich layers (6); the clothes front part, the clothes rear part and the sleeves are made of the shell fabric which is interwoven by warps and wefts; thermoluminescence crystals are attached on the warps and the wefts. According to the spliced clothes, the body temperature can be monitored in real time. The spliced clothes are relatively strong in luminescent intensity.

The invention discloses a quantitative sampling device for soil thermoluminescence measuring sample. The quantitative sampling device comprises a funnel disc (1), a quantitative disc (2) and a quantitative platform (3), wherein the funnel disc (1) is fixedly connected with the quantitative platform (3) through a connecting shaft (15), and the quantitative disc (2) is arranged between the funnel disc (1) and the quantitative platform (3); the quantitative disc (2) is connected with the connecting shaft (15) through a shaft hole in a swinging manner, the funnel disc (1) is provided with a discharge abdication port (9), the quantitative disc (2) is provided with a revolution abdication port (10), and a limiting bolt (7) is arranged in the revolution abdication port (10) and is connected with the funnel disc (1) or and the quantitative platform (3); one side of the revolution abdication port (10) is connected with the limiting bolt (7) in a limiting manner, the outlet of a funnel (8) is corresponding to the inlet position of the quantitative guide hole (11), and the other side of the revolution abdication port (10) is connected with the limiting bolt (7) in the limiting manner; and the outlet of the quantitative guide hole (11) is corresponding to the inlet position of the discharge guide hole (14), and the inlet position of the quantitative guide hole (11) is arranged in the discharge abdication port (9). The sampling device provided by the invention ensures the sample to be quantitative and the operation to be simple and rapid.

Disclosed herein are a thermoluminescent dosimeter for radiation monitoring, comprising LiF doped with Mg, Cu and Si, and a fabrication method thereof. The LiF:Mg,Cu,Si thermoluminescent dosimeter is fabricated by heating a LiF-based thermoluminescent powder material having a composition of LiF mother material, 0.1-0.5 mol % of a Mg compound, 0.001-0.05 mol % of a Cu compound and 0.5-1.3 mol % of a Si compound to a temperature of 900-1200° C. to melt the LiF-based material, cooling the melted material, compression-molding the cooled material, sintering the molded material, cooling the sintered material, and then annealing the cooled material. The thermoluminescent dosimeter has high thermal stability and thus maintains constant thermoluminescence sensitivity even when it is annealed at a high temperature of more than 240° C. Moreover, it has a remarkably low residual signal, and shows excellent dosimetric characteristics, because it can maintain the same sensitivity as its initial readout value, even when it is reused.

The invention relates to the technical field of laser crystal and discloses a carbon-doped yttrium aluminium garnet crystal and a two-step preparation method thereof. The carbon-doped yttrium aluminium garnet crystal is prepared by doping carbon in the yttrium aluminium garnet crystal. The invention also discloses the preparation method of the crystal, comprising the following steps: processing pure YAG crystal into YAG crystal plates, then adopting high-purity carbon as an evaporation source to carry out diffusion and carburization treatment to the pure YAG crystal plates and obtaining the carbon-doped yttrium aluminium garnet crystal. The invention adopts high-purity carbon as the evaporation source to carry out diffusion and carburization treatment to the pure YAG crystal plates, and can avoid the volatilization of carbon in the process of the preparation. The preparation method is characterized by simpleness and high efficiency. The carbon-doped YAG crystal has high thermoluminescent and photoluminescent sensibility and has potential application value in the field of the thermoluminescent or photoluminescent dosimetry.

The invention discloses a thermoluminescence fabric, which is formed by interweaving wraps and wefts and is characterized in that thermoluminescence crystals are adhered on wraps and wefts to lead the fabric to form a mesh-shaped luminous structure. The thermoluminescence fabric of the invention is different from traditional luminous fabric and has the following advantages: 1. the fabric can utilize the heat energy generated by fabrication when human body moves to emit light, save energy and protect environment, is particularly applicable to work clothes for working in road without lights and night field work, and is applicable to outdoor sport equipment; 2. compared with traditional reflective fabric, the fabric of the invention can emit light itself without external light, has wider applicable scope and firmer fabric combination, and is not easy to strip; 3. compared with the fabric requiring to weave cells for luminance, the fabric of the invention has simple structure and low cost, and is not easy to be damaged; and 4. compared with the photoinduced energy storage luminescent material, the fabric of the invention has stronger luminous intensity, thus having wider applicable scope.

The invention provides heating equipment for electrical heating card thermoluminescence dose measurement, and is used for solving the problem in existing electrical heating technology that linear and programmed heating and automatic measurement cannot be performed on multiple thermoluminescence detectors in one time. The heating equipment for electrical heating card thermoluminescence dose measurement includes a workbench, an electrical heating mechanism and a power mechanism, the workbench is used for placing detected dosimeter cards, a limiting body is arranged at an upper side of the workbench, the electrical heating mechanism includes a plurality of heating heads, the plurality of heating heads are located under the workbench and used for heating the detected detectors on the workbench, the power mechanism includes a power source and a lifting buffer mechanism driven by the power source, and the electrical heating mechanism is arranged on the lifting buffer mechanism and used for adjusting the positions of the heating heads. The measuring equipment is simple in structure and convenient to operate, and can realize linear and programmed heating of multiple detectors in one time, thereby accurately measuring the exposure dose of the detectors.

The invention discloses a method for measuring influences of imbedding a 125I particle source in a support or a catheter on dose distribution, and relates to a method for measuring of the influences of imbedding the particle source in the support or the catheter on the dose distribution. The method for measuring the influences of imbedding of the 125I particle source in the support or the catheter on the dose distribution comprises the steps of firstly, using a standard source for energy calibration and dose calibration on thermoluminescence dose detectors, secondly, making a tumor equivalent model, thirdly, machining cylindrical holes in the center position of the upper surface of the model, fourthly, symmetrically machining holes in a circle with the center of the upper surface of the model as the center of the circle, fifthly, putting the detectors after the calibration into the holes machined in the step four, putting the 125I particle source into the catheter or the support, then putting the catheter or the support on the cylindrical holes machined in the step three, conducting irradiation, then taking out the 125I particle source, respectively measuring measured values x of the detectors, and calculating the adsorbed dose according to the formula. The method is used for measuring the influences of imbedding the 125I particle source in the support or the catheter on the dose distribution.

A LabVIEW-based multi-functional optical test system and method relates to optical performance test. The system comprises a test hardware part and a LabVIEW-based measurement and control system platform, wherein the test hardware part comprises a light source system, a temperature control system and a data acquisition system, the light source system is used for simulating a light-emitting sample,the temperature control system is used for controlling a temperature of the light-emitting sample, the data acquisition system is used for acquiring test data, the light source system, the temperaturecontrol system and the data acquisition system are all in coupling connection and / or communication connection with the measurement and control system, the light source system comprises a light sourceand a light source control module, and the light source is in communication connection with the measurement and control system platform by the light source control module. By the system, the measurement and control system platform having five test modes such as a long afterglow attenuation curve, a thermoluminescence curve, a time resolution phosphorescence spectrum, fluorescence thermal quenching and fluorescence thermal stability is achieved.

The invention relates to a duplex energy-saving LED semiconductor chip which is composed of a direct current power source, a wire, a positive copper electrode, a P-GaN film, a GaN film, a N-GaN film, a N-GaN substrate, a HfO2 film, a P-ZnO film and a negative copper electrode. Electrons are input from the negative copper electrode and composited with holes inside the light-emitting layer HfO2 film on the right side and the light-emitting layer GaN film on the left side respectively, and photons are emitted. On the basis of thermoluminescence principle, the energy of the photons emitted by the HfO2 film is larger than electric field work, and the excessive energy comes from heat released by the light-emitting layer GaN film on the left side. The duplex LED semiconductor chip adopts combination of electroluminescence and thermoluminescence for lowering the power consumption, so that the LED technology is promoted to develop to save energy and lower consumption.

Methods and systems convert combustion products to electricity, by efficiently coupling between photovoltaic cells with photons. The photons are emitted from a burning process of a photoluminescence material, the burning process including the chemical reaction of combustion.

Disclosed herein are a thermoluminescent dosimeter for radiation monitoring, comprising LiF doped with Mg, Cu and Si, and a fabrication method thereof. The LiF:Mg,Cu,Si thermoluminescent dosimeter is fabricated by heating a LiF-based thermoluminescent powder material having a composition of LiF mother material, 0.1-0.5 mol % of a Mg compound, 0.001-0.05 mol % of a Cu compound and 0.5-1.3 mol % of a Si compound to a temperature of 900-1200° C. to melt the LiF-based material, cooling the melted material, compression-molding the cooled material, sintering the molded material, cooling the sintered material, and then annealing the cooled material. The thermoluminescent dosimeter has high thermal stability and thus maintains constant thermoluminescence sensitivity even when it is annealed at a high temperature of more than 240° C. Moreover, it has a remarkably low residual signal, and shows excellent dosimetric characteristics, because it can maintain the same sensitivity as its initial readout value, even when it is reused.