A method and system for detecting ionizing radiation emitted by material located over an extended area are provided. The method and system include a radiation detector disposed within a detector space on a detection axis. An array of collimating louvers is positioned about the radiation detector and is movable between different polar positions or angles relative to the detection axis. A mechanism is provided for moving the array of collimating louvers between the different polar angles to collim...

The color indicator-dosimeter of ionizing radiation in accordance with the invention comprises 70 to 100 parts by weight of a thermoplastic polymer, 10 to 40 parts by weight of a plasticizer, 0.5 to 3.0 parts by weight of a stabilizer and two dyes compatible with said polymer. One of said dyes is incorporated in the color indicator-dosimeter to the extent of from 0.007 to 0.01 part by weight; its G value of decolorization in the polymer is 0.05 to 0.1 molecule/100 eV and its absorption maximum l...

A medical device is disclosed for the treatment of a body lumen by radiation. The device includes a catheter for insertion into a body lumen, a radiation source, and a wire for advancing and removing the radiation source into and from the catheter.

Improved ionizing structure for ambient air treatment wherein the structure incorporates an ionizing needle directed in the direction of airflow; the needle is negatively charged to produce an electrostatic field, preferably pulsating, whereby to ionize air constituent molecules, lint, and other entrained constituents, allowing the latter simply to precipitate out of the air and fall to the ground or floor beneath; in such manner ambient air within a room enclosure, for example, is cleaned for m...

A method and materials are described for the monitoring of ionizing radiation in a location or on a person. The method comprises providing a fluorescent organic sensor material in the location where monitoring is required, the fluorescent organic sensor material having a molecular structure comprising at least one pair of fluorophore units, the units being held together by a spacer unit such that they are capable of interacting to produce a distinct fluorescence spectrum different from those of ...

A beam inspection device includes an inspection head having a scintillator and at least one ionizing radiation diffuser block connected to the scintillator. At least one image may be formed from at least one part of the inspection head that includes the scintillator. The device may discriminate between a scintillation light from the scintillator and stray {hacek over (C)}erenkov light in the inspection head. The scintillator includes at least one heavy plate having two principal opposing faces, ...

A method of detecting ionizing radiation is provided. The method includes detecting ionizing radiation using a detector assembly having a pixelated semiconductor substrate, each pixel including a central region and a region of variable response, each pixel further including at least one anode, the detector assembly including a grid electrode coupled to a first surface of the semiconductor substrate such that the grid electrode circumscribes the central region of at least one pixel anode, the det...

An air cleaner is described wherein an ion wind is generated by an ionizing element and directed to pass over a dust collector surface. By proper design and adjustment of the ionizing element and collector, the unit can be operated without emitting charged particles, if any, in other than the direction of orientation of the dust collector surface and thus avoiding smudging of the surrounding walls. The collector may be cylindrical in form and may be separately detachable, rendering it readily av...

A detector for detection of ionizing radiation comprises a chamber (13) filled with an ionizable gas, and including a first (17, 19) and a second (21) electrode arrangement between which a first voltage (U.sub.1, U.sub.2) is applicable, a radiation entrance (33) arranged such that radiation (1) can enter the chamber between and substantially in parallel with the first and second electrode arrangements, for ionization of the ionizable gas, an electron avalanche amplification arrangement (15) incl...

An ionizing structure for ambient air treatment wherein the structure, optionally having ceiling-mounting provisions, incorporates an ionizing element forwardly directed in the direction of airflow through the structure, an electrical power supply coupled to the ionizing element for applying thereto a stepped-up, negative, direct-current voltage of the order of several thousand volts, and a buffer, in effect, in the form of electrical circuit means, e. g. a filter, operatively interposed between...