Fig. 1— Air Force collection device used in rain water survey. mc/sq mile/month = dis/min/aliquot , total sample volume 1 projected area of funnel, sq ft aliquot volume 79.6 For the purpose of these calculations “total sample volume”refers to the volume of the month’s rainfall computed from official U. S. Weather Bureau data.’ The Sr*® values were obtained in the same way, but for convenience of comparison they were extrapolated to the first day of each sampling month before caiculating the Sr®? /Sr* ratios. 2 FINDINGS The data are completely summarized in Table 1. Total g activity, Sr®° and Sr®/Sr®*® ratios, and rainfall volumes are listed by station for each sampling month. Total § activity is reported as of the counting date since the assignment of a specific burst date is not possible. For March, 17 stations are reported; for April, 47; for May, 31; for June, 43; and for July, 35. It will be noted that only six locations submitted enough sample for HASL to receive aliquots for all five months. These were West Newton,‘ Charleston, Tallahassee, Jacksonville, Nantucket, and Albany. 340