435 results about "Scintillation" patented technology

Inventions relates to scintillation substances and they may be utilized in nuclear physics, medicine and oil industry for recording and measurements of X-ray, gamma-ray and alpha-ray, nondestructive testing of solid states structure, three-dimensional positron-emission tomography and X-ray tomography and fluorography. Substances based on silicate comprising lutetium and cerium characterized in that compositions of substances are represented by chemical formulae CexLu2+2y−xSi1−yO5+y, CexLiq+pLu2−p+2−y−x−zAzSi1−yO5+y−p, CexLiq+pLu9.33−x−p−z□0.67AzSi6O26−p, where A is at least one element selected from group consisting of Gd, Sc, Y, La, Eu, Tb, x is value between 1×10−4 f.units and 0.02 f.units., y is value between 0.024 f.units and 0.09 f.units, z is value does not exceeding 0.05 f.units, q is value does not exceeding 0.2 f.units, p is value does not exceeding 0.05 f.units. Achievable technical result is the scintillating substance having high density, high light yield, low afterglow, and low percentage loss during fabrication of scintillating elements.

A gamma ray detector uses a scintillation detector having a response that matches a response characteristic of a photodiode. The detector may be used to measure natural gamma rays and / or gamma rays produced by interaction of neutrons from a neutron source with the earth formation.

The invention discloses a surface plasma fluorescence-enhanced nano composite structure film, which has the components of SiO2 with amino and composite nanoparticles with a nano composite structure, wherein the cores of the composite nanoparticles are metal nanoparticles, and the outer layers are quantum dots; and the metal nanoparticles are connected with the quantum dots through a SiO2 layer with the thickness of 4 to 30nm. The surface plasma fluorescence enhancement effect caused by the nano composite structure in the film makes fluorescence quantum efficiency of the quantum dots in the film greatly improved and the scintillation effect thereof eliminated. The invention also discloses a method for preparing the film. The nano composite structure film prepared by the method overcomes the defects of the quantum dots, which has great significance for applying the quantum dots in medicaments, biological detection, photoelectric conversion and Raman scattering, particularly using the quantum dots as single photon source in the field of quantum dot coding.

The invention discloses a multi-layer scintillation detector and a measurement method for high-energy proton and neutron energy spectrum measurement. The sensitive volume of the detector is formed by wrapping a scintillant with another scintillant; an interlayer is arranged between the inner layer scintillant and the outer layer scintillant; two photomultipliers are arranged on the two sides of the scintillants, and correspond to the two scintillants respectively; the interlayer is provided with a window in a position corresponding to the inner layer photomultiplier; the scintillants are pressure-welded and fixed by a housing; and the photomultipliers are fixed on the housing by photomultiplier bases. The detector can be used for the high-energy proton and neutron energy spectrum measurement under a charged particle, neutron and gamma ray complicated mixing field.

A photodiode whose long-wavelength cutoff is in the short-wavelength range (preferably, between ultraviolet and yellowish-green) having reduced temperature sensitivity is used in downhole applications. It may be matched with scintillation devices having an output matched to the response curve of the photodiode for use with nuclear logging devices. The photodiode may also be used in gyroscopes in which light from an LED matched to the photodiode is reflected from a spinning mass.

In a preferred embodiment, a stabilized scintillation detector, comprising: a light source that periodically produces a light pulse; distribution means that impinges some of the light pulse on a first photodetector and on a second photodetector; a scintillator that receives radiation and is coupled to the second photodetector; and a control unit that receives signals from the first photodetector and the second photodetector representative of the light pulse received by the first photodetector and the second photodetector and outputs, in part, a signal to the second photodetector to stabilize the second photodetector. A method of using the scintillator is also provided.

A photonic sensor system is provided. The system generally includes a beta emission source, optionally, a scintillation layer, and a luminophore-containing sensory layer. The system can be embodied in a particle. Also provided are photonic sensor strategies which are highly accurate and photonic sensors which are highly stable.

An optical field sensing system and an associated method are provided that are tolerant of scintillation. The system includes a wavefront sensor that measures gradients across a wavefront at a first resolution defined by the subapertures of the wavefront sensor. The system also includes an intensity sensor that measures the intensity across the wavefront at a higher resolution. The system further includes a wavefront processor that determines respective phases across the wavefront. In addition to the gradients and the intensity measurements, the wavefront processor may determine the respective phases based also upon the noise affiliated with the measurements. In this regard, the wavefront processor may determine the respective phases across the wavefront at least partially based upon the gradients as adjusted by weights that are based upon the intensity measured by the intensity sensor and are influenced by evidence of scintillation.

A displacement difference dosimetry method is provided for use with in-vivo scintillating fiber radiation detectors. A scintillating fiber includes an insertion end which is incrementally inserted into a human body using a catheter or hypodermic needle to provide a fixed (but not necessarily known) insertion path. A photomultiplier tube is coupled to the other end of the scintillating fiber and detects both scintillation light and any Cerenkov light for each position of the scintillating fiber insertion end along the fixed insertion path. The change in the amount of light detected by the photomultiplier tube divided by the corresponding amount of change in position of the scintillating fiber insertion end gives a measure of the dose rate at the scintillation fiber tip which is substantially free from the effects of Cerenkov light.

A neutron scintillator composite (NSC) is made of a neutron scintillator and a binder. The neutron scintillator of the composite has the formula LiyMgBry|2, where y=2, 4 or 6 and may further comprise cerium as a scintillation activator. The binder of the composite has an index of refraction substantially identical to that of the neutron scintillator. The neutron scintillator and binder are mixed into a solid or semi-solid neutron scintillator composite having sufficient flowability for molding into a shaped article, such as a neutron sensing element of a radiation detector. The neutron scintillator composite collects and channels photons through the material itself and into a photosensing element optically coupled to the composite. Because the indices of refraction for both the neutron scintillator and the binder are substantially identical, scattering at the scintillator-binder interface(s) is minimized, thereby producing transmission efficiencies that approach single crystals.

A bundle of drawn fibers that have X-ray scintillating unagglommerated nanocrystallite particles in plastic or glass cores of down to 0.1 micron spacing and claddings of X-ray absorbing compounds in the cladding composition. Optional is a cover to the bundle that blocks light from leaving the bundle at the X-ray side while allowing X-rays to pass into the cores. To image the light exiting the fiber bundle at the sub-micron level, light expansion is preferable using either a lens system or a fiber bundle expander.

A gamma ray detector uses a scintillation detector having a response that matches a response characteristic of a photodiode. The detector may be used to measure natural gamma rays and / or gamma rays produced by interaction of neutrons from a neutron source with the earth formation.

The invention relates to a method for rapidly analyzing strontium-90 in liquid state efflux of a nuclear power plant. The method includes the following steps that (a) the liquid state efflux of the nuclear power plant is made to flow through a cation exchange color layer pillar under the acidic condition, a salpeter solution is used for leaching, and first eluant is obtained through collection; (b) the first eluant is made to flow through a P204 levextrel resin color layer pillar to be separated and purified, the salpeter solution is used for leaching, and second eluant is obtained through collection; (c) a scintillation solution is added and mixed and then is placed on a liquid scintillation spectrometer so that the counting rate of yttrium-90 can be measured; (d) an average value is acquired through repeated measurement, and the specific activity of yttrium-90 is calculated; (e) the specific activity of strontium-90 is calculated. On one hand, the liquid state efflux of the nuclear power plant is made to flow through the cation exchange color layer pillar under the acidic condition, so that radioactive substances in the liquid state efflux of the nuclear power plant are gathered; on the other hand, the first eluant is made to flow through the P204 levextrel resin color layer pillar to be separated and purified, hence, yttrium-90 can be separated from the first eluant, and strontium-89 and strontium-90 can be separated indirectly.

A focus / detector system of an X-ray apparatus and a method for generating projective or tomographic phase contrast recordings, are disclosed. In an embodiment of the system, the system includes a beam source equipped with a focus and a focus-side source grating, arranged in the beam path and generates a field of ray-wise coherent X-rays, a grating / detector arrangement having a phase grating and grating lines arranged parallel to the source grating for generating an interference pattern, and a detector having a multiplicity of detector elements arranged flat for measuring the position-dependent radiation intensity behind the phase grating. Finally, the detector elements are formed by a multiplicity of elongate scintillation strips, which are aligned parallel to the grating lines of the phase grating and have a small period, whose integer multiple corresponds to the average large period of the interference pattern which is formed by the phase grating.

The invention relates to low-valence-state ion-doped LuAg: Ce, Me scintillation ceramic and a preparation method thereof. The general formula of constitution of the scintillation ceramic is (Lu1-x-yCexMey)3 Al5O12; Me is one of Ca<2+>, Ba<2+>, Zn<2+>, Li<+> and Na<+> ions, or at least two of Ca<2+>, Ba<2+>, Zn<2+>, Li<+>, Mg<2+> and Na<+> ions, wherein x is more than 0 and less than or equal to 0.05, and y is more than 0 and less than or equal to 0.1. The preparation method disclosed by the invention has the advantages of simple process, low production cost and the like. The prepared low-valence-state ion-doped LuAg: Ce, Me scintillation ceramic has relatively strong light emission under stimulation of ultraviolet or visible light or X-ray or gamma-ray, and a stimulated emission wavelengthof the low-valence-state ion-doped LuAg: Ce, Me scintillation ceramic is matched with a sensitive region of a photoelectric detector; therefore, the scintillation ceramic has huge application potential in the field of high-energy ray detection.

A data measurement system (DMS) ( 30 ) for a computed tomography (CT) scanner ( 12 ) includes a plurality of connectorized detector sub-array modules ( 32 ). Each detector sub-array module ( 32 ) includes: a scintillator ( 40 ) that produces scintillation events responsive to irradiation by x-rays; a photodetector array ( 42 ) arranged to detect the scintillations; and two symmetrically arranged signal connectors ( 54 1 , 54 2) that transmit the photodetector signals. Symmetrically mounted pipeline cards ( 60 ) mate with the signal connectors ( 54 ) of each side of groups of the detector sub-array modules ( 32 ) to receive the photodetector signals. A processor ( 64 ) communicating with the pipeline cards ( 60 ) receives the photodetector signals from the pipeline cards ( 60 ) and constructs a DMS output from the photodetector signals.