Abstract:
A radiation dose measuring system using fluorescent dosemeters comprises fluorescent dosemeters including fluorescent glass elements having a fluorescent detection surface, a magazine capable of holding a predetermined number of fluorescent dosemeters, a magazine conveying device for conveying a magazine of a plurality of magazines fed one by one such that is predetermined segment is located to a take-out position, a fluorescent dosemeter take-out device for taking the fluorescent dosemeter from the magazine located in a predetermined position, a fluorescent glass element setting device for moving the fluorescent glass element to a predetermined measuring position and a dose measuring device for subjecting the fluorescent glass element which is set to a measuring position to an ultraviolet ray and for measuring an intensity of fluorescent light which is emitted from an excited glass element.
Abstract:
A radioactive particle counter for a plurality of discrete radioactive particle emitting samples, including a plurality of detectors for each sample to simultaneously detect the respective emitted radioactive particles and provide a respective electrical signal, a plurality of storage counters for simultaneously accumulating the respective sample count during a predetermined counting interval, and a read-out control unit for periodically, sequentially reading out the accumulated sample count in each storage counter and coupling same to a control counter for temporary display of the accumulated sample count or for eventually totalling of the respective sample count.
Abstract:
To measure the nuclear radiation of a sequence of radioactive samples, magazines that hold sample containers are removably positioned in shuttles, some of which are driven step-by-step by a toothed belt that engages racks on the sides of the shuttles from one compartment to another through a measuring station, with the shuttles that are being driven by the belt driving other shuttles not in engagement with the belt at that time. In the measuring station, the sample containers are released from the magazines one at a time through openings in their bottoms and lowered by a reciprocable support to a position adjacent to a radiation detector for the measurement, after which they are raised by the support to the magazine and the shuttle is driven one more step to the next position.
Abstract:
An elevator mechanism and method for raising and lowering radioactive samples through a shielded vertical counting chamber in a benchtop scintillation detector which has a practical limit on its height. The elevator mechanism adds little or nothing to the height of the detector by using an elongated flexible member such as a metal tape secured to the bottom of the elevator platform and extending downwardly through the counting chamber and its bottom shielding, where the tape is bent laterally for connection to a drive means. In the particular embodiment illustrated, the tape is bent laterally below the bottom shielding for the counting chamber, and then upwardly along or through one side of the shielding to a reel at the top of the shielding. The tape is wound onto the reel, and the reel is driven by a reversible motor which winds and unwinds the tape on the reel to raise and lower the elevator platform.
Abstract:
Methods and apparatus for handling flexible sample containers used for liquid scintillation spectrometry analysis where detector photomultiplier tubes are moved axially together ''''squeezing'''' the flexible container therebetween in the counting station to achieve close optical coupling. The sample containers may be made up of layered, flexible, light-transmissive, polyester film wherein the sample container portion is defined by joining the film layers. The flexible container may be individual units or a continuous strip and may include provision for identification data or records by way of a magnetic strip or punch character designation. Optimum counting efficiency is achieved with round flask-like configurations where the flexible container conforms to the shape of the photomultiplier tubes used therewith.
Abstract:
A scintillation counter, particularly for counting gamma ray photons, includes a massive lead radiation shield surrounding a sample-receiving zone. The shield is disassembleable into a plurality of segments to allow facile installation and removal of a photomultiplier tube assembly, the segments being so constructed as to prevent straight-line access of external radiation through the shield into radiation-responsive areas. Provisions are made for accurately aligning the photomultiplier tube with respect to one or more sample-transmitting bores extending through the shield to the sample receiving zone. A sample elevator, used in transporting samples into the zone, is designed to provide a maximum gamma-receiving aspect to maximize the gamma detecting efficiency.
Abstract:
A method and apparatus for optimizing the measurement of the radioactivity of samples in a scintillation type radioactivity counter in which successive samples are advanced into a counting chamber where the radioactivity of each sample is measured by detecting and counting the scintillations induced in a scintillation medium. In order to optimize the position of the sample relative to the scintillation detecting means, and thereby optimize measurement of the radioactivity of each sample, control means are provided for producing a command signal representing a selected position of the sample relative to the scintillation medium. This control means includes adjusting means for automatically adjusting the stop position of the sample in response to each command signal so that the sample is automatically stopped at a position represented by the command signal, and at which measurement of the radioactivity of the sample is optimized. Specific adjusting means disclosed are in adjustable limit switch and an adjustable wiper on a potentiometer, each of which controls the drive motor for raising and lowering successive samples relative to a counting chamber.
Abstract:
A slide specimen of exfoliated cells is prepared in the usual manner for microscopic optical examination of a Papanicolaou Test, up to the point of staining. At this stage, instead of the ordinary stains, a stain containing a radioisotope is used. The slide with the radioisotope-bearing stain is thereupon passed through a radiation counter which gives an indication of the amount of radiation the slide emits, which indicates the amount of radioactive stain absorbed by the specimen. This relative absorption amount indicates the differential staining of the cellular material and forms the equivalent electronic differentiation of the specimens to the standard Papanicolaou optical differentiation as viewed through the microscope. In this way, the automatic radiation counter is used to substitute for the human element in the microscopic evaluation of the specimens.
Abstract:
A mechanism for positioning a standard gamma emitter for use as an external standard in a liquid scintillation spectrometer as adapted to move the emitter between a shielded position in a metal body and an operative position close to a sample to be standardized. The mechanism comprises a rotatable disk, an arm carrying the emitter and connected to a motor by a driving mechanism which successively moves the emitter radially inward with respect to the disk, along a part circular path along with the disk and radially outward upon energization of the motor.
Abstract:
Apparatus and method for coding commands on a pseudosample signaling member (control tower) which may be sensed and used to alter the program of an automatic radioactivity measuring system for the following samples. The signaling member is placed in the sample conveyor. It may also direct functions such as group reject.