-8- Lea = (5X ¥,) to (2,100 1) pei/i and ~ D= (0.1%) to (0.37%) rads” wrere cy is the open field, external gacmua dose rate one hour following detonation, expressed in mr/hr. Current conservative practice is to use the upper limit of the dose range. The dose estimated by this technique is reduced by a factor of 5 if dairy cattle are only consuming contaminated dry feed. Also, only the fission yield of .a device is used to estimate the H+l hour gamma exposure rate, neglecting any induced activity. Evaluation of -Prediction Techniques A limited examination of the ability of the fallout scaling technique to repreduce observed data has been performed on e mumber of cases in three aifferent categories of events. The three categories of events include tower shots, excavation experiments, and ventings of underground detonations designed for complete containment. Observed exposure rate or exposure versus distance curves along the fallout hotlines for the several events in a given category have been normalized to an arbitrary set of conditions utilizing the scaling technique. If each event in a given category is a reasonable analog of the others in that category and if the parameters in the scaling equations are known accurately then the normalization should hopefully result in a tightly grouped set of curves. Tnree events, Hamilton, Humbolt, and Rio Arriba were chosen from the Hardtack II Test Series. Each of the devices was detonated on a wooden tower. ‘These