REED: Dr, Knox, when you talked about F, decreasing in row charges, was that for special tests? Would it go up a factor of maybe 5 for rows of 15 or 20 charges? KNOX: In fallout from row-charge detonations, F,, the fraction of the gamma activity appearing in the close-in fallout pattern, is not well known. The paper I presented utilizes F, data from USAEC Report PNE-300,. This report describes the F, experiments and measurements for tracer-loaded high-explosive sources detonated as single charges and as rows in alluvium (Pre-Buggy JD, These measurements of F, for row-charge shots and the corresponding measurements of F, for Single-charge shots indicate that F, for a row charge does not exceed that for a single charge by more thana factor of 2. It is not thought that F., is a linear function of the number of charges. However, a definite need exists to obtain better information on the vented fraction for row charges since the number of experiments contained in the Pre-Buggy Program is small. 355