travelled, is estimated by summing the cletances between the successive points from ground sero to point 30. In calculating q in Table 1, some volues are omitted as beyond the range of Fig. 1. bother with, in entering the quantities More values are dropped, as too small to 1 ——— p ,- (9)*. p The final totals are the . surface concentrations that would be produced if the initial central concentrations (Co) were all unity, When the method was tried out on YANKER, it was found that if the resultant surface concentrations were multiplied by 100, they agree reasonably well with the dose rate, in roentgens per hour, measured one day after the shot. This factor was used in mking up Table 2, and it appears to give fairly good results for BRAVO, ROMED, and UNION also, although there is sme tendency to over~estimate the lower dose rates at the larger distanses. In Table 1, however, it is clear that the agreement is about as good as in Table 2 without multiplying by a factor of 100. The yield of NECTAR was lees than that of the shots in Table 2, but not by a factor of 100, At the present time the only explanation that can be offered for this discrepancy is the heavy rain that occurred on NECTAR day. 7. There is good reason to anticipate that the current detailed etudy of the more conplex method will yield a better simplified technique than the above. For this reason, there is little justification for a more elaborate report on the method at this time, COPIED/DOE LANL RO -