106 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 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 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 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 belongs to the technical field of radiation equipment auxiliary instruments, belongs to a part of a thermoluminescence measurement system, and in particular relates to a thermoluminescence irradiator. The thermoluminescence irradiator of the present invention is a key instrument matched with a thermoluminescence dosimeter, comprising a main body 1, a disc 2, a sample tray 3, an irradiation source 4, a stepping motor 5, an upper cover 6, a display screen 7, The keyboard 8 has a thermoluminescent readout device for irradiating the annealed thermoluminescent element for screening and calibration of the thermoluminescent element. When in use, set parameters according to the required radiation dose, and the instrument can place multiple thermoluminescence dose components at a time.

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 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 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.

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 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.

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.