39 results about "Leakage radiation" patented technology

For reducing of the weight of leakage x-ray radiation shielding for a rotary piston x-ray tube that rotates in a cooling medium in a radiator housing of an x-ray radiator, the rotary piston x-ray tube having a rotary anode and a cathode fixedly connected with the vacuum housing thereof, the vacuum housing has at least one first region of a total shielding and the radiator housing has at least a second region of the total shielding. Only the respective regions of the vacuum housing and the radiator housing has that are irradiated by the leakage x-ray radiation are provided with shielding.

A treatment planning method and system for determining a treatment plan used to irradiate a treatment volume using a radiation treatment system that includes a multi-leaf collimator (MLC), is disclosed. The treatment plan includes settings for leaf patterns of individual leaves of the MLC, each leaf pattern including a geometry of the individual leaves and forming an aperture for use in the treatment plan. Areas of radiation leakage are identified in each of the leaf patterns, the areas of radiation leakage including first unshielded areas corresponding to gaps that are located between adjacent leaves and outside of the aperture. At least one leakage metric is calculated based on the areas of radiation leakage. A setting for at least one of the leaf patterns can be adjusted based on the at least one leakage metric.

The invention provides an adjustable-beam graphene wave leakage antenna. The adjustable-beam graphene wave leakage antenna can be used for generating wave leakage radiation of which beam is biased andis adjustable with an applied voltage and can cover a frequency band mainly being a low-terahertz frequency band, the volume size of the antenna under a 2THz frequency is 480 micrometers by 150 micrometers by 20 micrometers. The antenna mainly comprises an antenna radiation unit, a graphene voltage bias system and metal ground. The antenna has the advantages of small size, adjustable beam directional angle, relatively high gain and the like.

The invention discloses a device and method for detecting the leakage dose rate of X-ray security detection equipment. The leaked ray dose rate detection device comprises a radiation detection alarm host machine, five radiation detection probes and a specific positioning bracket which is used for fixing the radiation detection probes, wherein the radiation detection alarm host machine is provided with radiation detection alarm probe connecting wire imports; and the radiation detection alarm probes are connected with the radiation detection alarm host machine through connecting wires. The radiation detection alarm host machine of the detection device can simultaneously display detection results of the five radiation detection probes, and the alarm threshold valve of each radiation detection probe can be set respectively; when ultralimit alarm occurs, alarm probe numbers and information of actually measured leaked radiation dose rate can be definitely displayed by the radiation detection alarm host machine; and the method has the advantages of reasonable measuring point location setting, excellent synchronous measurement performance, scientific and safe detection mode, higher accuracy of detection results, and the like.

An x-ray apparatus that accepts an x-ray radiator therein has shielding for the x-ray leakage radiation originating from the x-ray radiator that is an Integral component of (built into) the x-ray apparatus. An x-ray radiator with an x-ray tube and a housing in which the x-ray tube is contained is composed only of materials that are not suitable for absorption of x-rays.

The invention discloses a device and method for detecting the polarization orientation of sub-wavelength scale multi-focus spots. After the angularly polarized laser beam is modulated by a phase-only spatial light modulator, multiple light spots with different polarization orientations can be generated on the focal plane. When the periodic slit microstructure on the surface of the gold film is placed on the focal plane, the incident light spot can be most effectively coupled into surface plasmons when the polarization direction of the light spot is perpendicular to the orientation of the slit. When the polarization direction of the light spot is parallel to the orientation of the slit, the incident light spot can hardly excite surface plasmons. When the polarization direction of the light spot and the orientation of the slit form an angle less than 90 degrees, the coupling efficiency is proportional to the square of the sine of the angle. The surface plasmon intensity at the position of multiple light spots can be observed through the leakage radiation microscopy imaging system, so as to realize the detection of the polarization orientation of each light spot.

The invention discloses a refractive index sensor and a detection method thereof. The refractive index sensor provided by the invention comprises an exciting device and a measuring device, wherein the exciting device comprises a monochromatic light source, a focusing device and a sensor chip; the measuring device is composed of a leakage radiation microscope system comprising an oil immersion objective, an imaging lens and a CCD (Charge Coupled Device) camera; the light emitted by the monochromatic light source is incident to the sensor chip via the focusing device to excite a surface plasma excimer SP; the leakage radiation light of the SP is collected by the oil immersion objective and is incident to the CCD camera together with the other beam of reference light after passing through the imaging lens, so as to cause interference at the CCD camera; the CCD camera records the information of interferometric fringes; and the refractive index of a sample to be measured on the upper surface of a metal thin film is monitored according to the cycle of the interferometric fringes. The refractive index sensor has the advantages that only a wavelength light source is needed, the structure is simple and the cost is low; the measurement is not sensitive to the intensity fluctuation of an incident light source and the noise of a detector; the accuracy of the data measurement is improved; and the microminiaturization and multi-channel detection of the sensor can be realized.

A system and method for generating and using broadband surface plasmons in a metal film for characterization of analyte on or near the metal film. The surface plasmons interact with the analyte and generate leakage radiation which has spectral features which can be used to inspect, identify and characterize the analyte. The broadband plasmon excitation enables high-bandwidth photonic applications.