Abstract: A process for preparing doped lithium fluoride suitable for use as a thermoluminescent radiation-sensitive material includes the sequential steps of:1) preparing a mixture of microcrystals of lithium fluoride and one or more dopants;2) heating the mixture at a temperature at which the dopants can diffuse into said microcrystals for a period of time sufficient to produce sensitized microcrystals of lithium fluoride;3) hot pressing the sensitized lithium fluoride microcrystals for a period of time sufficient to prepare a compact of doped polycrystalline lithium fluoride;4) cooling the compact to room temperature.

Abstract: A shield device attached to wheel patient support apparatus between a patient and an attendant, the shield device including radiation shielding material extending across wheel patient support in such a manner that attendants are shielded from the patient.

Abstract: A radiation analysis instrument is described for measuring the characteristics of radiation emanating from a source (XS). The instrument includes two absorbers (a, b) and corresponding detectors (10, 12) with the detectors being disposed in the path of the radiation and the absorbers being interposed between the corresponding detector and the source. A circuit (16) digitizes the analog signals derived by the two detectors and provides the digital values to a microcomputer (18) which stores these digitals values within a memory (50). A microprocessor (48) processes the digital signals stored within the memory (50) to analyze characteristics of the radiation emitted from and the potential applied across the source (XS). This instrument is particularly useful in measuring the kVp applied to X-ray tubes.

Abstract: A device for supporting a patient in restrained positions on a supporting table pivotally interconnected to a base frame. The table is selectively positionable relative to the frame and includes elements for retaining the patient on the table. A stress imposing unit is provided at one end of the table.

Abstract: The present invention relates to a radiation monitoring device which is utilized to measure the voltage supplied to an x-ray generator of an x-ray machine in terms of kVp units. The device includes a pair of detectors which are simultaneously exposed to an x-ray beam. The x-ray beam is filtered by a first amount before being supplied to the first detector, and is filtered by a second amount, greater than the first amount, before being supplied to the second detector. Both detectors generate an output signal having a magnitude proportional to the amount of radiation energy received. The ratio between the detector output signals is proportional to the amount of voltage supplied to the x-ray generator. The output signal of the first detector is an input to a first integrator which generates a voltage ramp output signal as an input to a trigger circuit. The output of the second detector is supplied to a second integrator which generates a second voltage ramp output signal as an input to a sample/hold circuit.

Abstract: A gain regulator is disclosed for use in a radiation analyzer system. The analyzer responds to a source of radiation having a known peak in its energy spectrum. Gain errors are detected by accumulating a count corresponding to the difference between the number of radiation particles occurring in windows in the energy spectrum which are above and below the desired centerline of this known peak. These two windows overlap in the area of the centerline. Gain is either incremented or decremented whenever the difference count exceeds preselected limits. The difference count is reset whenever a predetermined number of particles have been detected in either of the windows.

Abstract: A hand-held shielding device for holding and viewing a container of radioactive material is provided. The device comprises an elongated holding portion for the container formed with a longitudinal aperture therein and a shielding portion overlapping the aperture for shielding against direct radiation through the aperture. Indirect optical imaging is provided on the shielding portion for viewing the container and material therein at a viewing position away from direct radiations emanating through the aperture.

Abstract: An improved method, and apparatus for said method, for providing protection for an operator during the determination of radioactivity, and most especially during the assay of relative concentrations of two radioactive materials in a radioactive solution, are provided. The process for determining the relative concentrations, by comparing the total radiation emitted by a solution in a substantially unshielded vessel with the breakthrough radiation emitted by a shielded vessel of the solution, is improved by utilizing a special shielding container for the radioactive solution which can be used to provide the necessary shielding, for the breakthrough test, and can be removed, for measuring total radiation, without removing the solution from the radiation measuring means, thus avoiding direct human exposure to radiation, and which is also suitable for subsequent use as a protective container for the radioactive solution during medical diagnostic or other utilization following assay.