of fallout collected within the platforms was accomplished by the analysis of the collection data and the platform‘s air-flow characteristics, With a singlewind system the amount of fallout collected in the upwind part of the platform was lower than that collected in the downwind section and the collections around the platform varied symmetrically with respect to the wind direction. With a multi-wind system, simila: characteristics were exhibited about a reference direction which was correlated to the variability of wind directions and associated fallout amounts by a vector summation. The extent of sampling variation or collection bias in both systems can be defined by certain parametersJ For each platform the values of these parameters were obtained from the properties of a collection curve describing the variation around the platform. Collection completed by interpolation and (continued on next card) curves of both systems were their notable aspect is that UNCLASSIFIED of fallout collected within the platforms was accomplished by the analysis of the collection data and the platform's air-flow characteristics, With a singlewind system the amount of fallout collected in the upwind part of the platform was lower than that collected in the downwind section and the collections around the platform varied symmetrically with respect to the wind direction. With a multi-wind system, similar characteristics were exhibited about a reference direction which was correlated to the variability of wind directions and associated fallout amounts by a vector summation. The extent of sampling variation or collection bias in both systems can be defined by certain parameters, For each platform the valuesof these parameters were obtained from the properties of a collection curve describing the variation around the platform. Collection curves of both systems were completed by interpolation and their notable aspect is that (continued on next card) UNCLASSIFIED of fallout collected within the platforms was accomplished by the analysis of the collection data and the platform's air-flow characteristics. With a singlewind system the amount of fallout collected in the upwind part of the platform was lower than that collected in the downwind section and the collections around the platform varied symmetrically with :espect to the wind direction. With a multi-wind system, similar characteristics were exhibited about a reference direction which was correlated to the variability of wind directions and associated fallout amounts by a vector summation. The extent of sampling variation or collection bias in both systems can be defined by certain parameters, For each platform the valuesof these parameters were obtained from the properties of a collection curve describing the variation around the platform. Collection curves of both systems were completed by interpolation and their notable aspect is that (continued on next card) UNCLASSIFIED of fallout collected within the platforms was accomplished by the analysis of the collection data and the platform's air-flow characteristics. With asinglewind system the amount of fallout collected in the upwind part of the platform was lower than that collected in the downwind section and the collections around the platform varied symmetrically with respect to the wind direction. With a multi-wind system, similar characteristics were exhibited about a reference direction which was correlated to the variability of wind directions and associated fallout amounts by a vector summation. The extent of sampling variation or collection bias in both systerns can be defined by certain parameters, For each platform the valuesof these parameters were obtained from the properties of a collection curve around the platform. Collection completed by interpolation and (Continued on next card) describing the variation curves of both systems were their notable aspect is that UNCLASSIFIED