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3 results about "Optically stimulated luminescence" patented technology
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In physics, optically stimulated luminescence (OSL) is a method for measuring doses from ionizing radiation. The method makes use of electrons trapped between the valence and conduction bands in the crystalline structure of certain minerals (most commonly quartz and feldspar). The trapping sites are imperfections of the lattice — impurities or defects. The ionizing radiation produces electron-hole pairs: Electrons are in the conduction band and holes in the valence band. The electrons that have been excited to the conduction band may become entrapped in the electron or hole traps. Under stimulation of light the electrons may free themselves from the trap and get into the conduction band. From the conduction band they may recombine with holes trapped in hole traps. If the centre with the hole is a luminescence center (radiative recombination centre) emission of light will occur. The photons are detected using a photomultiplier tube. The signal from the tube is then used to calculate the dose that the material had absorbed.
Ceramic components containing beryllium aluminate
A beryllium aluminate component may include a beryllium aluminate ceramic comprising 90 wt% or more beryllium aluminate. The ceramic may be characterized by one or more of: a thermal conductivity from 17 W / m·K to 175 W / m·K at room temperature; a bulk resistivity greater than 1 x 1015 ohm-cm at room temperature and / or greater than 1 x 109 ohm-cm at 700 ºC and / or greater than 1 x 1010 ohm-cm at 600 ºC; a coefficient of thermal expansion from 7.4 to 9.0 µm / (m·K) at room temperature; a near bioequivalence to human body tissue (Zeff) from 7.2 to 11.3; and a density of from 3.4 to 3.9 g / cc. The beryllium aluminate components may be used in pedestal assemblies, wafer pedestals, wafer chucks, integral resistance heaters, and / or components thereof, as well as for optically stimulated luminescence, thermoluminescence, radioluminescence, or dosimetry systems thereof. Processes for preparing the beryllium aluminate ceramic components are also disclosed.
Owner:MATERION CORP
Sensor device for testing a safety feature with optically stimulated luminescence, test device and test method
Owner:GIESECKE & DEVRIENT CURRENCY TECHNOLOGY GMBH
A photoluminescence sample sampling device and method for geological mineral exploration
This invention discloses an optically stimulated luminescence (OSL) sample collection device and method for geological and mineral exploration, relating to the field of geological exploration sampling technology. It addresses the technical problems of slow single-sampling speed and complex processes in existing sampling devices. The OSL sample collection device includes a light-shielding shell, a feeding mechanism, a positioning mechanism, a pick-and-place mechanism, and a storage mechanism. The front of the light-shielding shell has a sampling port. The feeding mechanism is located inside the light-shielding shell and stores multiple unsampled sampling tubes. The positioning mechanism receives and aligns the sampling tubes with the sampling port. The pick-and-place mechanism pushes the sampling tubes through the sampling port for sampling, or retracts the sampled tubes back to the positioning mechanism. The storage mechanism receives and stores the sampled tubes. This invention enables sampling to be completed within the light-shielding shell, and the sample storage process is conducted in a light-shielding environment after sampling, avoiding the problem of premature fading of mineral particles due to natural light exposure.
Owner:SICHUAN PROVINCIAL INST OF COMPREHENSIVE GEOLOGICAL SURVEY & RES