39 results about "Optically stimulated luminescence" patented technology

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 present disclosure provides an optical detector for detecting radiation. The optical detector includes an optical light guide that incorporates a sensing region. The sensing region includes a sensing material that emits luminescence light when the sensing material is exposed to suitable ionizing radiation and accrues trapped charge which is released and produces optically stimulated luminescence (OSL) when the sensing material is optically stimulated. The optical detector also includes a light source for optically stimulating the sensing material and a light detector for detecting the OSL. The optical light guide is arranged to guide light through the sensing region and between the sensing region and the luminescence light detector.

The invention relates to a light stimulus system and a control method thereof, which comprises a host computer and a main machine that comprises an emitting illuminant, optical fiber, a dichroic mirror and an stimulated luminescence detector, wherein the emitting light emitted by the emitting illuminant is transferred by the optical fibre to stimulate light perception gene cells and generate stimulated luminescence which is reflected to the stimulated luminescence detector by the dichroic mirror and transferred to the host computer for processing and control; one end of the optical fibre is connected with the emitting illuminant, the other end of the optical fibre is a free end, and the host computer adjusts the moving travel of the free end of the optical fibre as well as the emitting illuminant according to whether to receive the stimulated luminescence; the light stimulus system stimulates the light perception gene cells to generate the stimulated luminescence and feed backs to the host computer by the emitting illuminant, and the host computer automatically controls the moving of the optical fibre according to the information of the stimulated luminescence, simultaneously controls and adjusts the emitting illuminant to realize automatic control of the entire stimulating recording process, utilizes the optical fibre to stimulate and sample, and has small wound.

A white-light emitting semiconductor device includes a first light-emitting die, a second light-emitting die, a photostimulable luminescent substance, and a holding assembly. The first light-emitting die emits a first radiation having a first wavelength range. The second light-emitting die emits a second radiation having a second wavelength range, and a third radiation having a third wavelength range different from the second wavelength range. The photostimulable luminescent substance is excitable to emit a fourth radiation having a fourth wavelength range. The fourth radiation is mixed with the first, second, and third radiations to result in white light. The holding assembly holds the first and second light-emitting dies, and the photostimulable luminescent substance.

A device is presented to measure radiation in a well drilled in a geological formation. The device comprises at least one sensing arrangement, a light source, and a light sensor. The sensing arrangement comprises an optically stimulated luminescence material arranged to be positioned near a zone of interest such as to accumulate radiation emitted by the zone of interest over a defined accumulation delay. The light source is arranged to optically stimulate emission of a luminescence light by the sensing arrangement with a stimulation light according to a first wavelength range. And the light sensor is arranged to measure the luminescence light emitted by the sensing arrangement according to another wavelength range, a measured intensity of the luminescence light related to the accumulated radiation.

There is provided herein a system and method for obtaining measurements of radiation exposure in real time using OSL and for obtaining improved accurate OSL measurements over a greater range of radiation exposures. In a preferred embodiment a signal-versus-dose response is obtained from an OSL dosimeter that is linear over all doses and does not exhibit saturation effects. The desired response is preferably calculated from the measured OSL-versus-time response from a suitable dosimeter obtained during irradiation. To obtain the desired response from the measured OSL data each measured OSL point has to be corrected for the depletion of the trapped electron concentration that occurs during each illumination period.

Described is a dosimeter reader for reading a plurality of optically stimulated luminescence (OSL) sensors of a dosimeter sled and for reading an RFID tag on the dosimeter sled.

There is provided a system and method for estimating radiation exposure in real time or in near-real time while a dosimeter is being irradiated. In the preferred arrangement, OSL will be used to calculate estimates of the radiation dose rate, preferably by using comparisons between illumination values measured during and after lighting the dosimeter with a laser light of a predetermined frequency. A first preferred embodiment utilizes quasi-equilibrium OSL intensity with periodic stimulation during continuous irradiation. Another preferred embodiment utilizes the amplitude of the transient OSL signal during periodic stimulation. Another preferred embodiment utilizes the difference between the OSL intensity at the end of one stimulation period and the beginning of the next. Finally, another preferred monitors the time constant for the return of the transient OSL signal to equilibrium, following either a change in dose rate or during a periodic optical stimulation.

A white-light emitting semiconductor device includes a first light-emitting die, a second light-emitting die, a photostimulable luminescent substance, and a holding assembly. The first light-emitting die emits a first radiation having a first wavelength range. The second light-emitting die emits a second radiation having a second wavelength range, and a third radiation having a third wavelength range different from the second wavelength range. The photostimulable luminescent substance is excitable to emit a fourth radiation having a fourth wavelength range. The fourth radiation is mixed with the first, second, and third radiations to result in white light. The holding assembly holds the first and second light-emitting dies, and the photostimulable luminescent substance.

Described is a dosimeter sled comprising: one or more optically stimulated luminescence (OSL) sensors mounted in the dosimeter sled and an RFID tag comprising an antenna for communicating with an RFID tag reader and a non-volatile memory for storing data therein.

The present invention relates to a soil sampler for measuring the optically stimulated luminescence (OSL) age of soil with a detachable soil sample accepting part to collect a soil sample and a storage device for the same. The soil sampler for measuring the OSL age of soil comprises a body part, a soil sample insertion part, the soil sample accepting part, a handle part, and a striking part. The inside of the body part is penetrated. The soil sample insertion part is mounted on the body part. The tip end of the soil sample insertion part is formed with an inclined hole to take the soil sample. The soil sample accepting part slides into the body part to accept the soil sample and is shaped into a cylinder. The handle part is mounted on the sample accepting part to separate the sample accepting part from the body part. The striking part is detachably attached to the body part while the handle part is accepted in the body part. The inner diameter of the insertion part is identical to the inner diameter of the accepting part.

A method of measuring luminescence of a material is disclosed. The method includes applying a light source to excite an exposed material. The method also includes amplifying an emission signal of the material. The method further includes measuring a luminescent emission at a fixed time window of about 10 picoseconds to about 10 nanoseconds. The luminescence may be radio photoluminescence (RPL) or optically stimulated luminescence (OSL).

An optically stimulated luminescence (OSL) reader having an optical engine with a removably mounted dichroic mirror is provided.

The invention discloses a thulium-terbium-doped lithium-magnesium phosphate optically stimulated luminescence phosphor and a preparation method thereof. The phosphor utilizes LiMgPO4 as a main body and is doped by thulium and terbium. A ratio of thulium to LiMgPO4 is in a range of 0.01-1mol% and a ratio of terbium to LiMgPO4 is in a range of 0.01-1mol%. The preparation method comprises mixing Tm2O3 and Tb4O7 as doping raw materials, LiOH.H2O, NH4H2PO4 and Mg(NO3)2.6H2O according to a certain ratio, carrying out grinding and stirring to obtain a uniform mixture, carrying out drying, sintering the dried mixture to obtain the thulium-terbium-doped lithium-magnesium phosphate optically stimulated luminescence phosphor. The thulium-terbium-doped lithium-magnesium phosphate optically stimulated luminescence phosphor has good sensitivity, moderate photopeak temperature, weak low-temperature peak signal, a simple and single high-temperature main peak, luminescence peak wavelength of about 455nm, good temperature stability and low luminescence decline, can be prepared conveniently and has a low cost.

The invention provides a sensitivity correction method of an optically stimulated luminescence dating experiment. The sensitivity correction method comprises the following steps of, in each loop teststep, calculating a regenerative-dose luminescence signal value and a test-dose luminescence signal value which are obtained through measurement, and acquiring a current regenerative-dose sensitivitychange value, wherein the current regenerative-dose sensitivity change value is a change quantity of the luminescence signal value measured by an equivalent regenerative dose; correcting the current regenerative-dose sensitivity change value, and obtaining a corrected regenerative-dose sensitivity change value, wherein a current test-dose sensitivity change value is a difference value between thetest-dose luminescence signal value measured in a previous loop test step and a current test-dose luminescence signal value measured in a current loop test step; and correcting the current test-dose sensitivity change value, and obtaining a corrected test-dose sensitivity change value. The sensitivity correction method can be used for effectively optimizing a correction method of a sensitivity change, so as to improve the test accuracy and reliability of an equivalent dose of a sample.

The invention relates to an automatic sample preparation apparatus and an optically stimulated luminescence dating instrument, which belong to the field of electronic and electrical equipment design and production as well as geology. The automatic sample preparation apparatus is characterized in that a primary election module is used for performing preliminary treatment of a sample and separatingthe sample to obtain the sample with appropriate particles, the sample is conveyed to a sample processing module, and is subjected to further processing treatment; and finally the sample is sent to acareful selection module for careful selection and separation to obtain the sample suitable for detection. The automatic sample preparation apparatus has the advantages of simple and controllable process, and high screening efficiency; the optically stimulated luminescence dating instrument comprises the above automatic sample preparation apparatus, the sample can be prepared by the automatic sample preparation apparatus, and the sample is tested through a measurement module.

The invention relates to an optically stimulated luminescence dosage tester. The optically stimulated luminescence dosage tester comprises an excitation light source, a photomultiplier, a beam splitter, a tester upper cover, a sample tray, a tester machine body, a plastic optical fiber and an optical fiber travel mechanism, wherein the optical fiber travel mechanism is fixed on the tester upper cover, a magnetic flow travel mechanism or a worm and gear travel mechanism is adopted as the optical fiber travel mechanism, the plastic optical fiber comprises a single optical fiber core, an optical fiber coating layer and an optical fiber outer layer, wherein the diameter of the optical fiber core is 8-15mm; the optical fiber travel mechanism is connected with one end of the plastic optical fiber, the other end of the plastic optical fiber is divided into two paths by the beam splitter, and the two paths are respectively connected to the excitation light source and the photomultiplier; a detachable drivepipe and a focusing lens are arranged at the front end of the optical fiber travel mechanism of the optically stimulated luminescence dosage tester. The optically stimulated luminescence dosage tester uses large diameter plastic optical fiber, so that the optical coupling efficiency is improved, and the light source excitation strength is improved; the optical fiber travel mechanism can accurately control the position of the optical fiber, reduces the influence of the excitation light source on adjacent samples, and can be used for measuring common samples and single grain samples.

The invention discloses an optically stimulated luminescence sample sampling device which comprises a carrier, the carrier is in a rectangular frame shape, a sampling console is slidably mounted in the carrier, two hydraulic cylinders are symmetrically and fixedly mounted at the top of the sampling console, and the output ends of the hydraulic cylinders are fixedly connected with a mounting sealing plate; a drilling motor is fixedly mounted in the middle of the bottom face of the mounting sealing plate, a reinforcing connecting rod is fixedly connected to the output end of the drilling motor, and a drilling mechanism is fixedly connected to the bottom end of the reinforcing connecting rod. According to the optically stimulated luminescence sample sampling device, an alloy drill bit is used for drilling holes in the geology, sampling is prevented from being affected by hard soil, the sampling efficiency is improved, meanwhile, the outer drill pipe continues to move downwards, the inner sampling pipe is filled with sediments, the whole process is effectively prevented from being irradiated by sunlight, the sample is packaged with a black plastic bag after sampling is finished. Automatic drilling and sampling are achieved, the sampling difficulty is greatly reduced, the sampling precision is improved, and use is convenient.

The invention relates to the technical field of nuclear radiation detection and provides time sequence control logic and signal processing algorithm suitable for pulsed optically stimulated luminescence technique-based quasi-real-time dose rate measuring devices. The time sequence control logic provided by the invention has the beneficial effects that a same reference clock is adopted as a reference to generate input pulse signals of a laser, a shutter, a photomultiplier and a counter; and the precise time sequence control of the laser, the shutter, the photomultiplier and the counter can be realized by each pulse signal through setting the number of skipped reference pulses and the relative time delay relative to the reference clock. The signal processing algorithm provided by the invention has the beneficial effects that various dynamic and static backgrounds are considered; the relationship between cumulative dose and count value is given by linear fitting results of experimental data; the cumulative dose loss caused by each dose rate measurement is compensated; and therefore, the quasi-real-time dose rate can be accurately given.

The invention discloses a pulse-excitation-based optically stimulated luminescence measurement and control device. The pulse-excitation-based optically stimulated luminescence measurement and control device comprises a pulse excitation optical source, a sample disc, a photomultiplier, a general signal receiving and control treatment module and an optical source control module, wherein a light outlet of the pulse excitation optical source is connected with a light inlet of the sample disc via an optical fiber; a light outlet of the sample disc is connected with the photomultiplier via an optical fiber; the general signal receiving and control treatment module is respectively connected with the photomultiplier and the optical source control module in a signal mode; the general signal receiving and control treatment module sends a signal to the optical source control module for controlling the excitation optical source, and receives the signal of the photomultiplier, and controls the photomultiplier for analyzing the received signal data. The pulse-excitation-based optically stimulated luminescence measurement and control device has the advantages of adjustable optical source, pulse light emitting, high expansibility, easiness in control, working efficiency improvement, and experiment preparation time and material waste reduction.

An optical wheel according to the present invention includes a luminescent material light emitting area on which light in a first wavelength range is incident from one side to thereby emit luminescent light excited by the light in the first wavelength range from another side, and a controlling and diffusing optical area including a controlling section on which the light in the first wavelength range is incident from the one side and configured to cause a diffusing characteristic of the light in the first wavelength range to differ between in a radial direction and in a circumferential direction.

A method for the synthesis of OSL grade polycrystalline mass of ceramic materials with dopant C involving source ceramic material preferably in its readily available powder form comprising the steps of melting of the said ceramic material in graphite environment including a graphite crucible / container in vacuum; and obtaining there from polycrystalline aggregate by rapid solidification of said melt to thereby provide said polycrystalline mass of ceramic materials with dopant C of optically stimulated luminescence grade. The said powder form of the ceramic material is compacted and formed into pellets before subjecting to melting.

An optically stimulated luminescence (OSL) sensor is provided that has a reflective backing for improving the efficiency of exposing an optically stimulated luminescence material (OSLM) of the OSL sensor to stimulation light and for increasing the efficiency of detecting luminescent light emitted by the OSLM.

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.

A label-shaped device is described, which is adapted to be applied onto an object for monitoring the time trend of the temperature of the object, the device comprising: a support substrate (1) and a layer of active material (2) applied onto the support, the active material comprising solid solutions of oxyorthosilicates and / or barium halide salts, doped with rare earths and / or transition metals; the active material being adapted to provide: a first indicator, as immediate visual information associated with the progressive change in colour related to the threshold temperature based on the progressive variation in the reflectivity of the material as a function of time and temperature, and a second indicator, based on an optically stimulated luminescence response (OSL) related to the temperature / time condition to which the object has been subjected in a given period of time, starting from an initially absorbed dose of electromagnetic radiation having an energy exceeding a minimum value dependent on the difference between energetic levels of the molecular structure of the material.

Substrates for suspending sample elements are disclosed, as well as sample platforms comprising such substrates, in which the sample elements can be analyzed with improved reliability. In exemplary embodiments, such sample elements are used in thermoluminescence dosimeters (TLDs) or optically stimulated luminescence dosimeters (OSLDs) to provide a calculated radiation dose with improved accuracy. The reproducibility associated with analyzing a sample element, and particularly one suspended by a film or encapsulated within films, may be significantly improved by tensioning the film(s). Tensioning may result during assembly of a sample platform, using a mechanical creasing force that is applied as the result of the configuration of a substrate of the sample platform, such as opposing sections or plates of this substrate. Alternatively, tensioning may be achieved using a separate application of force to the film(s) against a section or plate of the substrate.