## Measurement of radioactive fallout air sedimentation apparatusJohn F. Lakner, Lawrence Livermore Laboratory, University of California, Berkeley. Lawrence Radiation Laboratory University of California Radiation Laboratory, 1959 - 34 pages |

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1.0 FALL RATE 100-mg samples 18F finest 20 DIAMETER 4F coarsest adapted to fractionate AIR SEDIMENTATION APPARATUS bution collection unit coral sample counting curve for coral curves for fallout deagglomerating forces DEAGGLOMERATOR SETTING deagglomerator slit width density DIAMETER IN MICRONS distri distribution analysis curves distribution curve fall distance Fallout samples run Figure 17 fineness of sample fractionated coral mean diameter mean free path method MICRONS Fig mil i i i i mil obtained ogive Order of fineness Particle size distribution particles falling Pb powder plot powder sample pressure chamber pressure for coral probability grid proper deagglomeration pressure psig radioactive distribution radiological fallout range Recovery and Accuracy reproducibility of results sample of fractionated shift to finer sintered size distribution analysis smallest particle solenoid valve standard deviation standard Micromerograph Stokes straight distribution line straight line t-test terminal velocities trial pressure runs velocity of fall weight of material x-axis