FALLOUT PREDICTOR. Quarterly Report No. 2 for October 1, 1958 to December 31, 1958
A functional flow chart of a program for calculating fallout is presented. The flow chart includes the introduction of input parameters, the calculation of particle settling rates, the interpolation of winds in time and space, the calculation of horizontal displacements taking topography and rainout into account, the accumulation of the final data, and a data output. The stabilized bomb cloud dimensions can best be determined by empirical means for bomb yields greater than 10 kilotons although data is scarce for bursts above 100 kilotons yield. The dimensions of clouds from bombs of less than 10 kiloton yield are difficult to predict with accuracy. In a surface burst, most of the radioactivity is in the lower third of the mushroom cloud. The radioactivity has a Gaussian distribution when plotted against particle size. An expression for the radiation cooling effect for a 20 kiloton surface burst is derived and combined with Machta' s basic relationship for determining the maximum height of a bomb cloud. Hadiation of heat does not appear to significantly affect the maximum height of the bomb cloud. The bomb cloud is displaced horizontally by winds existing at the bomb site and downwind from the bomb site for extended time periods. The time the cloud spends in each wind layer can be found from typical time versus height curves determined empirically. The cloud motion can then be calculated by using the time and wind data. A functional flowsheet is developed for calculating the settling rates of particles. Two alternatives are discussed, one using a constant height decrement, the other using a constant time decrement. (For preceding period see AD
- Research Organization:
- Ford Instrument Co., Long Island City, N.Y.
- DOE Contract Number:
- DA-36-039-SC-78185
- NSA Number:
- NSA-14-009660
- OSTI ID:
- 4212123
- Report Number(s):
- AD-212845
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-60
- Country of Publication:
- United States
- Language:
- English
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