188 results about "Cesium iodide" patented technology

A compact includes a mixture of a solid binder and at least one nanopowder phosphor chosen from yttrium oxide, yttrium tantalate, barium fluoride, cesium fluoride, bismuth germanate, zinc gallate, calcium magnesium pyrosilicate, calcium molybdate, calcium chlorovanadate, barium titanium pyrophosphate, a metal tungstate, a cerium doped nanophosphor, a bismuth doped nanophosphor, a lead doped nanophosphor, a thallium doped sodium iodide, a doped cesium iodide, a rare earth doped pyrosilicate, or a lanthanide halide. The compact can be used in a radiation detector for detecting ionizing radiation.

A container inspection equipment with cobalt-60 gamma-ray source and cesium iodide or cadmium tungstate detector includes a cobalt-60 gamma-ray source, a cask, a front collimator, a rear collimator, a cesium iodide or cadmium tungstate detector, signal and image processing systems, container trailer system, and automatic control system. The cask of the cobalt-60 gamma-ray source, the beam shutter, and the front collimator are fixed on the same chassis to form an integration and placed in the source room. The rear collimator, cesium iodide or cadmium tungstate array detector and the radiation catcher are fixed on the same chassis to form an integration and placed in the detector room. A container inspection tunnel is formed between the source room and the detector room. The equipment is mainly used for inspecting smuggling goods and contrabands etc., in large containers, container trucks, train carriage and air containers. The equipment either can be installed in the sea port and land frontier customs or installed at the air port, vital communication line, and railway station.

The present invention provides for a composition comprising a crystal composition or inorganic scintillator comprising a thallium doped sodium iodide, cesium iodide, or lithium iodide scintillator useful for detecting nuclear material.

The back scatter detector is one truncated rectangular pyramid structure comprising one bottom plane, one top plane and four side planes to form one sealed casing. The bottom plane as the X-ray incident window has outer layer of aluminum-plastic board and inner layer of barium fluorochloride screen; and the top plane and the four side planes have transparent flash cesium iodide crystal sheets adhered to the inner surface and mounted photomultipliers. The present invention has barium fluorochloride layer to absorb low energy X-rays and transparent cesium iodide crystal sheets to absorb high energy X-rays, and this can greatly reduce afterglow, raise the X-ray absorbing efficiency and raise light converting efficiency.

The present invention is an indirect AMFPI wherein a phosphor such as a structured cesium iodide (CsI) is used to convert x-ray energy to optical photons or a charge, which is then detected by a two-dimensional array of either thin-film transistors (TFTs) such as an amorphous a-Se TFTs or a photodiode array. A scanning control circuit generates pulses to turn on the TFTs one row at a time, and thus the charge in the individual arrays is transferred from the TFT to one or more external charge-sensitive amplifiers. The charge-sensitive amplifiers are shared by all the pixels in the same column. The two-dimensional array can be read in real time.

The invention discloses a non-destructive testing systems and a non-destructive testing method used for detecting a metal-rope-containing detection target through X-ray detection. The system comprises: an ultrahigh-voltage generator, an X-ray generator, a cesium iodide sensor, an optical fiber module, a controlling module, a computer, and a power supply module. The method comprises the steps that: one-dimensional energy variation data is recorded; a two-dimensional image is spliced; the image is transferred into a GPU; dark current is eliminated; gain adjustment is carried out; metal region segmentation is carried out; defect detection is carried out; the result is transferred to a computer internal memory; feature extraction is carried out; mode recognition is carried out; and the result is outputted. According to the invention, through X-ray processing, GPU calculating, and image processing algorithms, defects such as low detection precision, long feedback cycle, offline spot-check, low efficiency, and the like of other methods are solved. The system and the method provided by the invention can satisfy requirements of various terminal users such as belt manufacturers, mines, ports, power plants, steel plants, cement plants, and the like.

A lamp unit for emitting near-infrared light by electric discharge, has: a hollow discharge tube; a cesium halide enclosed in the hollow of the discharge tube; a near-infrared penetration filter covering around the discharge tube. The cesium halide may include at least one of cesium iodide and cesium bromide. Also, an indium halide and thallium halide may further be enclosed in the hollow discharge tube.

The invention relates to a co-doped thallium-doped cesium iodide scintillation crystal, a preparation method thereof and applications thereof. The scintillation crystal has a chemical composition of (Cs[1-x-y]Tl[x]RE[y])(I[1-y]X[3y]) or (Cs[1-x-y]Tl[x]Yb[y])(I[1-y]X[2y]), wherein the trivalent co-doped element RE is at least one selected from trivalent lanthanum (La), lutecium (Lu) and ytterbium (Yb); a divalent co-doped element is divalent Yb; the X is at least one selected from F, Cl, Br and I; the x is more than 0 and not more than 0.05; and the y is more than 0 and not more than 0.05. By co-doping, the photon yield of the scintillation crystal is not influenced on one hand, and the afterglow of the thallium-doped cesium iodide scintillation crystal is inhibited on the other hand, and therefore the co-doped thallium-doped cesium iodide scintillation crystal can be widely applied for X-ray safety detection, nuclear medicine, and other nuclear radiation detection technologies.

The invention discloses thallium-doped cesium iodide composite film and a preparation method thereof. The composite film is formed by sequentially coating a copper film layer, a thallium-doped cesium iodide film layer and a moistureproof protecting film layer on a base material from the upper part to the lower part; the preparation of the composite film can adopt the existing film coating technology to sequentially coating the copper film layer, the thallium-doped cesium iodide film layer and the moisture protecting film layer on the base material. Research shows that the composite film has the advantages that as a metal Cu film and a CsI:Tl film have efficient metal plasma enhanced luminescence effect, compared with a film, without an added metal Cu film layer, the luminescent intensity of the composite film is furthest increased by more than 85 times in a 400 to 450 nm blue band, and the composite film has strong blue-light emitting feature, and is expected to be applied to photoelectron fields, such as LED and the like.

Disclosed are a radiation image conversion panel which has achieved a radiation image with enhanced sharpness and improved moisture resistance and shock resistance, and a production method thereof. The radiation image conversion panel comprises, on a support, a phosphor layer comprising phosphor columnar crystals, each composed mainly of cesium iodide (CsI) and formed by a process of gas phase deposition, wherein a coefficient of variation of crystal diameter of the phosphor columnar crystals is not more than 50% and a coefficient of variation of phosphor filling factor of the phosphor layer is not more than 20%.

[Problems to be Solved] It is an object of the present invention to provide a novel radiographic image detector which can detect radiation, such as hard X-rays or γ-rays, with high sensitivity and which is excellent in position resolution and count rate characteristic.

[Means to Solve the Problems] A radiographic image detector comprises a combination of a scintillator, such as a lanthanum fluoride crystal containing neodymium, for converting incident radiation into ultraviolet rays; and a gas multiplication ultraviolet image detector for converting ultraviolet rays into electrons, amplifying such electrons by use of a gas electron avalanche phenomenon, and detecting the electrons. The radiographic image detector is characterized in that the gas multiplication ultraviolet image detector is basically constituted by a photoelectric conversion substance, such as cesium iodide or cesium telluride, for converting ultraviolet rays into electrons; a gas electron multiplier for amplifying electrons by use of the gas electron avalanche phenomenon; and a pixel electrode having an amplification function and a detection function.

In a photoelectric conversion panel, a plurality of TFTs are formed over an insulating substrate. The TFTs are covered by a first planarizing film. A plurality of photodiodes are formed over the first planarizing film. The photodiodes and the first planarizing film are covered by a second planarizing film. A scintillator contains cesium iodide and is directly vapor-deposited over the photoelectric conversion panel. The scintillator is formed in an area, over the second planarizing film, extending to the outside of an area in which the TFTs and the photodiodes are formed and located inside edges of the first and second polarizing films.

The invention discloses an X-ray camera and a manufacturing method thereof. The X-ray camera is manufactured by coupling a fiber optic taper with a CCD (Charge Coupled Device) or CMOS (Complementary Metal-Oxide-Semiconductor) camera, wherein a needle-like CsI (Cesium Iodide) crystal, a moisture sealer and an aluminium coating or a silicon nitride film are arranged on a big end of the fiber optic taper in order; the fiber optic taper is manufactured by the steps of: sleeving a low-refractive-index cladding on a high-refractive-index core material of an ordinary fiber optic taper, on the basis, sleeving a black glass or lead silicate glass sleeve matching with the fiber optic taper in thermophysical properties, manufacturing a fiber array cylinder according to a front-end process of manufacturing a fiber optic panel, and then drawing the cylinder according to the proportion between the big end and a small end of the fiber optic taper, wherein the fiber optic taper made of the lead silicate glass sleeve requires hydrogen reduction treatment; and after the needle-like CsI crystal, the moisture sealer and the aluminium coating or silicon nitride film are manufactured in order on the big end of the fiber optic taper, the small end of the fiber optic taper is coupled with a light-sensitive surface of the camera by using optical cement. The X-ray camera manufactured in such a way has the minimum pixel reaching 5 micrometers and the resolution ratio being above 301p/mm with good MTF (Modulation Transfer Function).

The invention relates to a preparation method of an inorganic perovskite thin film and an application in a solar cell, belonging to the technical field of solar cells. Excess cesium iodide is added asan additive to an inorganic perovskite solutio to deposite a high-quality inorganic perovskite film, the obtained thin film is used as light absorbing layer in the solar cell. The method can obtain the inorganic perovskite thin film with low porosity, uniform and compact, and greatly reduce the annealing temperature of the thin film and greatly reduce the energy consumption. The photovoltaic performance of inorganic halide perovskite solar cells can be greatly improved by applying the device to perovskite solar cells, and the prepared device has excellent environmental stability and repeatability, and is suitable for large-scale industrial production. As that technological condition such as the addition amount of the cesium iodide additive, the thickness of the active layer, the anneal temperature and the like are optimized, the invention is applied to a carbon-based all-inorganic perovskite solar cell, the photoelectric conversion efficiency can exceed 10%, and the photoelectric conversion efficiency has good stability.

The present invention belongs to the field of radiation detection technology. The radiation imaging array solid detector includes flash crystal of cesium iodide or cadmium tungstate, photodiode coupled with the flash crystal and casing holding the flash crystal and the photodiode. The casing consists of metal cover plate, metal bottom plate, front end cover, back end cover and two side plates. The metal cover plate is provided with several slots for heavy metal partitions to set in and to separate flash crystals to form several solid detectors. The photodiode is led out through insulators penetrating the metal bottom plate and rubber pad, and there are rubber pads for insulation between different parts. Compared with available technology, the present invention has high detection efficiency, simple production process, less dead area and other advantages.

A ghost is reduced while improving the sensitivity. A scintillator has a plurality of columnar crystals formed of thallium-activated cesium iodide, and converts X-rays into visible light and emits the visible light from the distal end of the columnar crystal. The photoelectric conversion panel has a plurality of photodiodes formed of amorphous silicon to generate electric charges by detecting the visible light emitted from the scintillator. Assuming that the maximum emission intensity of the scintillator is I₁, a wavelength at which the maximum emission intensity is obtained is W_P, and the emission intensity at a wavelength of 400 nm is I₂, I₂/I₁≧0.1 and 540 nm≦W_P<570 nm are satisfied.

The invention relates to a cesium iodide scintillator screen and a packaging method thereof. The cesium iodide scintillator screen comprises a reflection substrate, a cesium iodide scintillator layer deposited on the reflection substrate, a waterproof transparent film stitched on the upper surface of the cesium iodide scintillator layer, and a substrate layer adhered to the lower surface of the reflection substrate, wherein the peripheral edge of the cesium iodide scintillator layer is provided with a sealant, the lower surface of the sealant is attached to the reflection substrate, and the upper surface of the sealant is attached to the waterproof transparent film. Through such a mode, the cesium iodide scintillator screen can realize water blocking and waterproofing effects, enhances rigidity, employs a simple packaging process, substantially reduces scintillator packaging cost, and improves packaging efficiency.

There is provided a radiological image detection apparatus having excellent sensitivity. A scintillator has a plurality of columnar crystals formed of thallium-activated cesium iodide, and converts X-rays into visible light and emits the visible light from the distal end of the columnar crystal. A photoelectric conversion panel generates electric charges by detecting the visible light emitted from the scintillator. The molar ratio of thallium to cesium iodide in the scintillator is in a range of 0.1 mol % to 0.55 mol %. The half width of the rocking curve of the (200) plane of the columnar crystal is equal to or less than 3°.

The invention discloses a zero-dimensional Cs3Cu2I5 perovskite scintillation crystal and application thereof. The zero-dimensional Cs3Cu2I5 perovskite scintillation crystal is prepared through the steps that firstly, N, N-dimethylformamide and dimethyl sulfoxide are mixed evenly to prepare a mixed solution, cesium iodide and cuprous iodide are added into the mixed solution, stirring is conducted to prepare a supersaturated precursor solution, and finally crystal growth is conducted through an inverse temperature crystallization method after the supersaturated precursor solution is filtered. When the Cs4PbI6 perovskite crystal is prepared, the inverse temperature crystallization method is adopted, operation is easy, controllability is high, repeatability is good, and large-scale industrialproduction can be achieved; meanwhile, the crystal prepared by the method is good in transparency, good in stability, high in quantum luminous efficiency and high in responsivity, and can be used fornuclear radiation detection.

There is provided a compound represented by the general formula Cs₃Cu₂[I_1-xCl_x]₅, wherein x is 0.71 or more and 0.79 or less. Also, there is provided a method for producing a compound, comprising mixing cesium iodide, cesium chloride, and copper chloride together in such a manner that the molar ratio of cesium to copper to iodine to chlorine is 3:2:5(1-x):5x (wherein 0.71≦x≦0.79), melting the resulting mixture, and solidifying the resulting molten material to give a compound.

An afterglow property of cesium iodide: thallium (CsI:Tl), in which CsI is a host material and doped with thallium, is improved. It is possible to improve the afterglow property of a scintillator by doping a crystal material including CsI (cesium iodide), as a host material, and thallium (Tl), as a luminescent center, with bismuth (Bi).