A report of an experimental study conducted to design, build, and test an electrostatic precipitator to determine the feasibility of fallout sampling by electrostatic precipitation is presented. Electrostatic precipitation of airborne particulates provides a capability of qualitatively defining the nuclides present as well as quantitatively defining the gross radiative activity. The conclusions are; electrostatic precipitation will provide a superior sample collection rate that might be increased even further by continued design studies, removing collected particulates in a fluid bath would result in a selective solubility fractiona ion that would prevent an accurate concentration by filtration but would permit concentration by evaporation of the fluid, and electrostatic collection on a thin compactible, conducting plastic film would provide an optimum collection technique since the film could be advanced through the collector at periodic intervals to allow a continuous sampling capability and all of the sample could be contained in a good thin-disc sample geometry. The samples collected during this study provided readily analyzable gamma scintillation spectra and an analysis of this spectra is presented. (Author).

An experimental investigation to determine the feasibility of using an electrostatic precipitator for sizing airborne micron size particles has been completed. Samples of particles with known radii and physical properties were injected into the precipitator under controlled conditions. The resulting deposition patterns were measured and checked against a mathematical model previously developed at the Air Force Institute of Technology (D.L. Lamberson. A study of the electrostatic precipitation of radioactive aerosols. M.S. Thesis, 1961) but modified by the author. The point at which particles were collected was found to be extremely sensitive to physical properties of the particles sampled so that an electrostatic precipitator could not separate particles into size fractions unless the particles sampled had the same physical properties. (Author).

Although the field of radioactive air sampling has matured and evolved over decades, it has lacked a single resource that assimilates technical and background information on its many facets. Edited by experts and with contributions from top practitioners and researchers, Radioactive Air Sampling Methods provides authoritative guidanc

The analysis, optimization, and design of a twostage parallel plate precipitator are discussed. An IBM 7090 digital computer program is used to achieve all theoretical results. Negative corona discharge is used throughout, and aerosol charging by bombardment and diffusion methods are combined into one time dependent equation. Precipitator optimization theory is presented and the effects on precipitator sensitivity and efficiency of varying corona current, velocity, and geometry are studied in detail. A theoretical design is presented in order to determine the feasibility of precipitation at high velocities and altitudes. (Author).