Abstract: A mobile chair for a panoramic dental x-ray machine is provided with locking means for establishing the chair in proper position for radiography with a patient on it and for enabling the chair to be rolled out and away from the machine for being replaced by an ordinary wheel chair.

Abstract: Sample material of retention time peaks of a chromatograph are exposed to infrared radiation at first and second wavelengths and the absorption of the infrared energy by the sample peak is measured. The measured infrared absorption at the first and second wavelengths is correlated with the retention time of the sample peak as an identification of the sample material. In addition, overlapping retention time peaks are resolved by detecting the change in the ratio of the infrared absorption at the first and second wavelengths as a function of retention time for a given peak.

Abstract: X-ray generation by stimulated emission of radiation is achieved from an ensemble of energized atoms with inner-shell vacancies, which ensemble of atoms is obtained in one example by the interaction of a beam swept at approximately the speed of light along the length of an extended interactant material providing an active region moving in synchronization with a resonant X-ray pulse traveling along the material.

Abstract: The system includes a scanning electron microscope (SEM) and a color kinescope (CRT). The electron beams of the SEM and the CRT are driven in a synchronized raster. A first signal representative of back-scattered electrons, for example, is fed to a color encoder section, the output of which drives each of the red, green and blue guns of the CRT to generate a uniquely encoded color representation of the information in the first signal. A second signal, which may be derived from the secondary electron image of the sample is used to modulate the brightness of the CRT in accordance with the scanning electron beam. There is thus presented on the CRT a color image of high resolution and information content, and one which is ideally suited to human perception.

Abstract: A field emission electron gun provided in a housing defining a vacuum chamber comprises a field emission tip as an electron source, an anode spaced from and facing the field emission tip, the field emission tip and the anode defining a space in which the field emission tip produces electrons. An evaporation source disposed in the vacuum chamber, the evaporating material from which forms evaporation layers on the inner surface of the vacuum chamber and the anode surface. A first voltage source is interconnected between the field emission tip and the anode, in order to accelerate the electrons from the tip toward the anode, and a second voltage source is connected with the evaporation source to supply a current for the evaporation. The evaporation layers are formed before the first voltage source is actuated, whereby reactive gases adhering to and embedded to the inner surface of the vacuum chamber and the anode are suppressed from being drawn out by electron bombardment.

Abstract: Disclosed is an improved apparatus for electrostatically charging an electrophotographic film held stationary with respect to a corona source. The improvement consists of a capacitor interconnecting the film to ground for limiting the amount of charge deposited upon the film during charging.

Abstract: A power supply and timing circuit for an X-ray tube capable of maintaining constant X-ray exposure values and stable peak plate voltage despite relatively large variations in the voltage of the source from which the power supply is fed. The cathode-to-plate current in the X-ray tube is varied responsively to changes in the voltage of the source, thereby varying the load on the high voltage transformer and holding its output voltage at a constant value despite changes in the source voltage. Changes in the cathode-to-plate current may be compensated for by the use of a milliampere-second integrator to time the exposure.

Abstract: Disclosed is an electrostatic recording method for forming an electrostatic latent image on a dielectric electrostatic recording layer provided on a conductive support. The relationship between the thickness d[.mu.m] and the specific dielectric constant .epsilon..sub.s of the electrostatic recording layer is such that the ratio of d[.mu.m] to .epsilon..sub.s, i.e. d/.epsilon..sub.s [.mu.m], is not larger than 1.65[.mu.m] when the image recorded is of reflection type and not larger than 1.5[.mu.m] when it is of transmission type. The latent image formed on the recording layer is developed by use of electrophotographic liquid developer. Also disclosed is an ionizing radiation image recording method wherein ionizing radiation carrying image information is directed onto a material which generates photoelectrons or a gas which is dissociated upon receipt of the ionizing radiation to an extent corresponding to the intensity of the radiation.

Abstract: A rock specimen is step scanned in an electron probe x-ray microanalyzer. A plurality of x-ray spectrometers (for example three) forming a part of said electron probe x-ray microanalyzer simultaneously detect characteristic x-rays corresponding to three elements at each scanning point on the rock specimen. The concentration of each element is calculated from the output signals of said plurality of x-ray spectrometers and the calculated elemental concentrations are then converted into atomic ratios accordingly. From this information, the type of mineral at each scanning point is designated by a character which is recorded on a display means in synchronism with the step scanning so as to display a mineral map of the specimen being examined.

Abstract: A fluorescent X-ray sulfur analyzer is disclosed and includes a radiation source for irradiating a sample with X-rays or .gamma.-rays, a radiation detector for detecting the radiation generated from the sample irradiated by the X-rays or .gamma.-rays and a first analyzer for selecting only fluorescent X-ray pulses from the output of the detector. The analyzer further includes a first pulse rate measuring device for measuring the pulse rate of the pulses selected by the first analyzer, a second analyzer for selecting only pulses of compton scattered rays from the output of the detector and a second pulse rate measuring device for measuring the pulse rate of the pulses selected by the second analyzer. An operational circuit is provided for operating the outputs of the first and second pulse rate measuring devices and is calibrated to compensate for the error caused by the variation of the carbon-hydrogen ratio to realize an accurate weight content of the sulfur in the sample.

Abstract: A method and apparatus for detecting and quantitatively measuring a molecular species of gaseous material in a sample to be analyzed are provided. Light containing incoherent infrared radiation is collected, collimated and transmitted by a light conditioning means to a primary filtering means. The primary filtering means selectively transmits light having a frequency range in the region of an absorption band for a molecular species to be detected. A secondary filtering means, adapted to receive the filtered light, transmits light at a plurality of discrete frequencies, providing a detectable signal, through the gaseous material. The intensity of the signal changes in proportion to the concentration of the molecular species. Means are provided for measuring and recording the magnitude of the signal intensity change.

Abstract: In spite of optimum density on the film, tomography using automatic exposure control can produce exposures which have a less pronounced movement unsharpness than could be expected on the basis of the geometrical proportions. It was found that such effects always occur when the tube power resulting from the exposure control substantially deviates from the tube power initially adjusted. Therefore, means are provided which enable, in dependence of this difference, the exposure data to be changed for the next exposures of a series of tomographic exposures.

Abstract: A positioning and supporting arrangement for a patient to be irradiated with penetrating radiation is disclosed. The patient is supported on a curved platter, the curvature of which conforms to the curvature of an arcuate groove formed longitudinally in a table or couch. In order that the platter may be slidably moved along the groove, a suitable drive means therefor is described. Preferably a shroud covers the underside of the platter, the shroud being formed of, or including, material which provides a well defined, consistent coefficient of friction between the platter and the table or couch.

Abstract: The vacuum chamber for an Auger analyzer is provided with a side access port through which interchangeable specimen trays are inserted and installed on a rotatable support structure. The specimen tray has a plurality of peripheral specimen sites and a Faraday cup probe structure similarly positioned but affixed to the support structure. The Faraday cup facilitates calibrating the ion beam and positioning the ion beam and the cup at the focal point of the electron beam. The support structure is subsequently rotated to sequentially expose each specimen to the beams.

Abstract: A film drive mechanism is disclosed for use with a radiographic apparatus which provides continuous radiographs or x-rays of a selected portion of a subject lying in a horizontal position by simultaneously rotating an x-ray source and an x-ray film holder including an x-ray film about the subject. An x-ray film cassette is mounted in the film holder and while the film holder rotates about the subject, the film cassette is moved past an x-ray slit. The film holder includes a novel drive mechanism for moving the cylindrical film cassette, in which an x-ray film is placed, at the proper rate of speed to provide the desired x-ray during rotation of the source and film holder. This is accomplished by utilizing a sloped cam having a configuration determined by the desired focal trough to vary the relative rotation of the shaft of a motor driving the film and the housing of the motor.

Abstract: The isotope U.sup.235 is separated from a gasified isotope mixture of U.sup.235 and U.sup.238 by selectively exciting the U.sup.235 from the ground state utilizing resonant absorption of radiation from precisely tuned lasers. The excited isotope is then selectively ionized by electron bombardment. It then is separated from the remaining isotope mixture by electromagnetic separation.

Abstract: A corpuscular beam microscope, specifically an electron microscope, inclug means for adjusting the position of the object image in the microscope, and means, coupled to said adjusting means, for determining and correcting drift of the object image by means of a control signal which controls the adjusting means and is derived from a convolution of an actual object image with a stored reference object image. The improvement of the invention comprises the provision of means for deriving the convolution by imaging the actual object image directly on the reference object image.A method for determining the convolution of the actual and reference object images in which the brightness values of the images are reduced to two values and the images are subsequently brought into coincidence is also disclosed.

Abstract: A process and apparatus for separating isotopes from gaseous mixtures by forming a seeded molecular beam comprising a carrier gas and the isotopes, exposing the seeded beam to a laser light having a particular radiation frequency to accentuate differences in the velocity profiles of the isotopes in the beam and separating the isotopes based upon the differences in their velocity profiles. The frequency of the laser is such as to excite only one of the isotopes, e.g. the lighter one, so that it possesses a larger amount of rotational energy without exciting the other isotope(s).

Abstract: A tilted drum having an X-ray opaque rim formed with slits parallel to the drum axis has a rim portion interposed between an X-ray tube and an X-ray opaque stationary surface formed with a slit perpendicular to the drum axis to provide a scanning pencil beam of X-rays of rectangular cross section as the drum rotates about its axis.

Abstract: A radiation-detecting device which is mounted on a gas-turbine engine to receive radiations from the afterburner combustion-zone, includes a gas-filled electrical discharge tube that is located within a tubular nose of the device and is pulse energized. The ultra-violet component of radiations from the zone and distinctive of the presence of flame in the afterburner, is transmitted to the discharge tube via a sapphire plano-convex lens, the infra-red component being attenuated by a thin gold-film coating on the planar face of the lens, whereby discharge takes place in the tube with each energizing pulse only while the flame is present. The sensitivity of the detecting device to ultra-violet radiation is enhanced by internal reflections from reflective coatings on the inner surface of the tubular nose and the glass envelope of the discharge tube.