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8680476 Beta radiation monitor and method  
A beta radiation monitor (70,90), comprising a gas flow proportional detector (60) for detecting beta radiation emitted by a beta emitter external to the detector; a fill gas supply (51)...
8223913 Method and apparatus for detecting high-energy radiation using a pulse mode ion chamber  
A method for measuring high-energy radiation includes applying a voltage pulse to electrodes in an ion chamber filled with a gas capable of forming charged ions by the high-energy radiation;...
8188442 Non-radioactive electron capture detector for GC  
Electron capture detector for use with an effluent stream from a gas chromatograph includes a non-radioactive electron source means and an adjacent ionization chamber in which electron capture...
7737424 X-ray window with grid structure  
A high strength window for a radiation detection system includes a plurality of intersecting ribs defining a grid having openings therein with tops of the ribs terminate substantially in a common...
7368726 Method and apparatus for detecting high-energy radiation using a pulse mode ion chamber  
A method for measuring high-energy radiation flux includes applying a positive voltage to electrodes in an ion chamber filled with a gas capable of forming charged ions by a high-energy radiation,...
7196336 Apparatus for injecting plasma gas in atmosphere  
An apparatus for injecting plasma in the atmosphere is provided, including a plurality of dielectric panels (13a, 13b, 13c), and 13d, which are disposed in parallel at predetermined intervals, a...
6765198 Enhancements to ion mobility spectrometers  
An ion trap mobility spectrometer is provided. The ion trap mobility spectrometer employs algorithms to simultaneously detect and analyze both positive and negative plasmagrams. Selectivity is...
6717153 Apparatus and methods for monitoring emissions  
Ions produced by radioactive gases present in air impact on the sensitivity of contamination measuring instruments which detect ions generated by radioactive materials present on an item. Methods...
6455859 Selective flow path alpha particle detector and method of use  
A method and apparatus for monitoring alpha contamination are provided in which ions generated in the air surrounding the item, by the passage of alpha particles, are moved to a distant detector...
6429020 Flashback detection sensor for lean premix fuel nozzles  
A sensor for detecting the flame occurring during a flashback condition in the fuel nozzle of a lean premix combustion system is presented. The sensor comprises an electrically isolated flashback...
6023169 Electron capture detector  
ECD with a non-radioactive electron source for generation of ions in a reaction chamber. The reaction chamber consists of two partial chambers, of which one is evacuated and contains the electron...
5920072 Ionization detector  
An ionization detector having an upper ionization chamber, a lower ionization chamber, and a radioactive source located in the upper ionization chamber but shielded from the lower ionization...
5861629 Method of and device for the quantitative detection of material in a sample  
Method of quantitatively detecting material in a sample, whereby the material is in the form of submicrometric particles covered by a photoemitting substance, and a device for practicing the...
5804828 Method and apparatus for optimizing the sensitivity and linearity of an electron capture detector  
Electron capture detector for use with an effluent stream from a gas chromatograph includes an ionization cell and a sample inlet system connected to the ionization cell for providing an effluent...
5773833 Photo-ionization detector for volatile gas measurement  
A photo-ionization detector (PID) which measures volatile organic gas uses electrically insulated parallel plates to energize a miniaturized gas discharge UV lamp and an energy efficient method to...
5760291 Method and apparatus for mixing column effluent and make-up gas in an electron capture detector  
Electron capture detector for use with an effluent stream from a gas chromatograph includes an ionization chamber and a sample inlet system connected to the ionization chamber wherein the sample...
5679958 Beta particle monitor for surfaces  
A beta radiation detector which is capable of reliably detecting beta radiation emitted from a surface. An electrically conductive signal collector is adjustably mounted inside an electrically...
5561344 Photo-ionization detector for detecting volatile organic gases  
A photo-ionization detector utilizes an ultraviolet (UV) lamp and is designed for detecting and measuring the concentration of volatile gases flowing between closely spaced parallel electrodes....
5550381 Event counting alpha detector  
An electrostatic detector for atmospheric radon or other weak sources of alpha radiation. In one embodiment, nested enclosures are insulated from one another, open at the top, and have a high...
5539208 Surface radiation detector  
A surface radiation detector for sensing low energy ionizing radiation on the surface of an object includes a open window gas proportional counter provided with a compressible skirt surrounding...
5345083 X-ray detector comprising an improved entrance window  
An inner side of a radiation entrance window in an X-ray detector is provided with an electrically conductive layer of gold, platinum, irridium or a mixture of these elements. Using such a layer,...
5324948 Autonomous mobile robot for radiologic surveys  
An apparatus for conducting radiologic surveys. The apparatus comprises in the main a robot capable of following a preprogrammed path through an area, a radiation monitor adapted to receive input...
5317159 Method of using an electron capture type detector  
An electron capture type detector for gas chromatography has an ionization vessel containing therein line sources for a radioactive isotope serving as a negative electrode, a collector electrode,...
5298754 Gas flow Geiger-Mueller type detector and method monitoring ionizing radiation  
A substantially stable, substantially portable open-window gas flow Geiger-Mueller type detector capable of monitoring ionizing radiation having an electrically conductive chamber with one or more...
5281824 Radon detection  
A detector for atmospheric radon using a long range alpha detector as its sensing element. An electrostatic filter removes ions from ambient air, while allowing radon atoms to pass into a decay...
5254861 Biological aerosol particle detector and method having an electronic pulse detection means  
System and method for detection and measurement of airborne biological aerosol particles in a gaseous sample are described comprising a source of low energy radiation for irradiating the gaseous...
5200614 Ion mobility spectrometers  
An ion mobility spectrometer is provided which employs an electron capture process. A sample gas stream is irradiated to produce positive ions and electrons in an ionization chamber. An open grid...
5194737 Single and double grid long-range alpha detectors  
Alpha particle detectors capable of detecting alpha radiation from distant sources. In one embodiment, a voltage is generated in a single electrically conductive grid while a fan draws air...
5187370 Alternating current long range alpha particle detector  
An alpha particle detector, utilizing alternating currents, whcih is capable of detecting alpha particles from distinct sources. The use of alternating currents allows use of simpler ac circuits...
5126676 Gas amplified ionization detector for gas chromatography  
A gas-amplified ionization detector for gas chromatrography which possesses increased sensitivity and a very fast response time. Solutes eluding from a gas chromatographic column are ionized by UV...
5028544 Method of analysis of organic compounds in chromatography and apparatus for performing this method  
The objects of the invention are attained in an apparatus for performing a method of analysis of organic compounds in chromatography, comprising a chromatographic column sealingly connected with...
4990786 Method and apparatus for determining the actual artificial aerosol alpha activity concentration in the air  
The Alpha Energy Range Discrimination (AERD) method employs first and second proportional counter tubes separated by a foil and an electronic evaluation system, and comprises the following steps:...
4880983 High pressure xenon ionization detector  
A method is provided for detecting ionization comprising allowing particles that cause ionization to contact high pressure xenon maintained at or near its critical point and measuring the amount...
4879472 Multiplexed electronically programmable multimode ionization detector for chromatography  
Method and apparatus for detecting and differentiating organic compounds based on their electron affinity. An electron capture detector cell (ECD) is operated in a plurality of multiplexed...
4870281 Gas-filled X-ray detector  
The anode connections in a gas-filled X-ray detector are mounted so as to extend transversely of the anode wire so that a substantial saving as regards space is achieved. In order to reduce field...
4862005 Apparatus for detecting radioactive contaminants on hand tools  
An apparatus for detecting radioactive contamination in hand-held objects, such as tools used to service a nuclear power facility, is disclosed herein. The apparatus generally comprises a...
4837440 Method and apparatus for characterization of aerosols  
Aerosol particles, resulting from the combustion of organic substances with insufficient oxygen supply, usually contain toxic, higher hydrocarbonic substances (e.g. tar) on their surface. These...
4820925 Room air monitor for radioactive aerosols  
A housing assembly for use with a room air monitor for simultaneous collection and counting of suspended particles includes a casing containing a combination detector-preamplifier system at one...
4804846 Photoionization detector for gas chromatography  
An improved photoionization detector has a sweep gas inlet which is used to introduce sweep gas near the window of the detector's ultraviolet lamp. The detector's chamber has a vent which allows...
4789783 Discharge ionization detector  
A discharge ionization detector has a detector body with first and second chambers and an interconnecting aperture passageway. A glow discharge emission in the first chamber is directed through...
4775795 Method and apparatus for detecting very small concentrations of gases in a gas mixture  
A method for detecting very small concentrations of gases in gas mixtures passed as a gas stream through a measuring cell having a chamber through which the gas stream flows through, a drift zone...
4733086 Thermal electron source  
A thermal electron source suitable for use in an electron capture detector comprises a source of stable ultra-violet light, an ultra-violet transparent support member (20,31) located in the path...
4721858 Variable pressure ionization detector for gas chromatography  
Method and apparatus for differentiating organic compounds based on their electron affinity. An electron capture detector cell (ECD) is operated at pressures ranging from atmospheric to less than...
4705948 Closed-loop pulsed helium ionization detector  
A helium ionization detector for gas chromatography is operated in a constant current, pulse-modulated mode by configuring the detector, electrometer and a high voltage pulser in a closed-loop...
4684807 Flow contoured electron capture detector cell  
A small volume electron capture detector has a cylindrical cell 120 inside which there is provided a generally funnel-shaped insert structure 130 having a cup-shaped section and a cylindrical...
4680472 Process and apparatus for the stabilization of measuring results furnished by an "electron capture" detector with identification of anomalies affecting the detector  
When using an electron capture detector for the molecular identification of electrophilic compounds, the sensitivity of the detector is made reproducible by controlling the voltage or frequency of...
4651008 Sample inlet system for an electron capture detector  
An electron capture detector for use with a capillary column is provided with a sample inlet comprising a tubular anode through which sample molecules and a make-up gas are introduced into the...
4585932 Monitor system for potentially hazardous radiation and combustion conditions  
A system for monitoring potentially hazardous conditions in an area. The monitor system provides a continuous check of the atmosphere in a given area for nuclear radiation hazard and for...
4567368 Bipolar pulsed electron capture detectors  
In operating an ECD in constant current mode, two pulses are implemented either to the same electrode or to separate electrodes, thereby dispersing the space charge sheath near the collector...
4538066 Modulated voltage metastable ionization detector  
Metastable ionization detectors used for chromatographic analysis usually employ a fixed high voltage for the ionization potential. For this reason, the operating range is limited to about three...

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