Abstract:
A zone grid assembly for flagging specified X,Y memory locations for accumulated data analysis and for presentation on a display in connection with a radioactivity distribution detection system. The zone grid assembly includes a printed circuit board formed with a plurality of holes and a pair of arcuate conductors disposed diametrically opposite one another about the periphery of each hole. A plurality of electrically conducting and magnetically responsive balls are slidably received within the zone grid assembly in such a manner that each ball is adapted for engagement and disengagement with one pair of conductors. A magnetic stylus held in spaced relationship with the zone grid assembly operates to actuate a ball in registration therewith into engagement with its associated pair of conductors. In consequence, the engaged pair of conductors are electrically connected and a signal denoting a particular X,Y position in the zone grid assembly is applied to the memory for processing, each X,Y grid position corresponding to an X,Y address location in the memory.
Abstract:
Distribution of radioactivity, e.g. in the human body, is measured by an array of light emitters superposed on an array of light conduits. The emitters and conduits are so arranged, e.g. in staggered rows, that each emitter will activate either a single conduit or a unique combination of conduits, thus communicating its location if struck by incident radiation. A reduced number of photodectectors, amplifiers and the like are thus required.
Abstract:
1,218,124. Ionization detectors. BAIRDATOMIC Inc. 9 Aug., 1968, No. 38272/68. Heading H1D. [Also in Division G1] A detector for investigating the radiation emanating from various points in an area comprises a planar array of a multiplicity of ionisation chambers which have electrically conducting walls, accommodate insulated pins, include an ionizable gas and are interconnected by ports for gas pressure equalization, the pins being connected to a matrix and a source of potential so that a chamber-pin discharge occurring due to incident radiation may be Indicated. The chamber may be formed from two sheets one having a multiplicity of blind holes or from three sheets comprising a coverplate of aluminium or a metallized plastic, a metal honeycomb, and an insulating plate carrying pins in registry with the centres of the honeycomb apertures. The gas may be static and under pressure, or circulating and the pulses developed during a discharge may be applied through graded " row " and "column " resistors and amplifiers to position the spot of a cathode-ray tube which may be photographed to integrate the coincident spots. The pulses may be counted in a magnetic store memory and the arrangement may include means for preventing interference between successive pulses. Specific reference is made to the use of the apparatus for examining a chromatographic paper containing dispersed concentrations of radioactivity associated with small sites of " tagged " chemical materials. The honeycomb may be of lead, aluminium, copper, brass or stainless steel and dimensions are exemplified.