Measurement of Radioactive Fallout Air Sedimentation Apparatus
An apparatus involving a fundamental idea of air sedimentation has been adapted to fractionate radiological fallout samples and measure their radioactivity. This paper describes the principle involved, its limitations, and many of the characteristics of the apparatus. A discussion is included on the use of probability paper for size distribution analysis.
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18F finest 250p slit width 4F coarsest adapted to fractionate AIR SEDIMENTATION APPARATUS bution collection mechanism collection unit coral sample coral using 30 counting curve for coral curves for fallout curves from trial deagglomerating forces deagglomerator slit width density DIAMETER IN MICRONS distri distribution analysis curves distribution curve fall distance Fallout samples run fineness of sample fractionated coral Geiger tube LESS THAN DIAMETER llllll llllllll mean diameter mean free path method MICRONS Fig nitrogen feed pressure number of samples obtained ogive Order of fineness Particle size distribution particles falling Pb powder plot powder sample pressure for coral probability grid psig radioactive distribution radiological fallout range Recovery and Accuracy reproducibility of results sample of fractionated shift to finer sintered size distribution analysis size distribution curve smallest particle solenoid valve standard deviation Stokes straight distribution line straight line terminal velocities velocity of fall WEIGHT LESS weight of material x-axis