Measurements of the Movement, Concentration and Dimensions of Clouds Resulting from Instantaneous Point Sources

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Abstract
Puffs of the inert gas 85Kr were released at the surface level and were permitted to drift through a three-dimensional grid of Geiger counter sensors extending to a height of 21 m and to a distance of 800 M. Concentrations were recorded as a series of 4.8-sec duration mean concentrations for each of the 64 sensors. Data specifying the effective speed, the effective height, the magnitude of short-period concentrations, the magnitude of crosswind and downwind concentration integrations, and the dimensions of puffs are reported. It was found that: 1) the speed with which a puff reached a 1.5 m elevation field sensor increased with distance from the source (or with travel time); 2) at the 1.5 m elevation, peak values of short-period concentration, exposure, and crosswind integrated concentration increased with increasing atmospheric stability; 3) regardless of the atmospheric stability, puff dimensions along a downwind axis exceeded those along a crosswind axis, and the crosswind dimension exceeded t... Abstract Puffs of the inert gas 85Kr were released at the surface level and were permitted to drift through a three-dimensional grid of Geiger counter sensors extending to a height of 21 m and to a distance of 800 M. Concentrations were recorded as a series of 4.8-sec duration mean concentrations for each of the 64 sensors. Data specifying the effective speed, the effective height, the magnitude of short-period concentrations, the magnitude of crosswind and downwind concentration integrations, and the dimensions of puffs are reported. It was found that: 1) the speed with which a puff reached a 1.5 m elevation field sensor increased with distance from the source (or with travel time); 2) at the 1.5 m elevation, peak values of short-period concentration, exposure, and crosswind integrated concentration increased with increasing atmospheric stability; 3) regardless of the atmospheric stability, puff dimensions along a downwind axis exceeded those along a crosswind axis, and the crosswind dimension exceeded t...

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