FALLOUT PROGRAM QUARTERLY SUMMARY REPORT

- 2 -To document and Jmintultt a check on the background contamination on thefilter paper, blanks were processed for each IPC filter paper roll used dur~ Iing this operation* Leakage tests were performed on all air samplers inorder to insure that the air samples collected were indicative of the altitude •and area over which an aircraft sampled and not contaminated ixx flight to orfrom the sampling area*•The main purpose of this report is to present the collected data for all "interested persons without waiting for a meteorological interpretation^ which ^ir» planned for some future date*mBackground Contaminationgated .The levels of background contamination on blank filter papers were investiSix rolls of IPC 1^78 filter paper wore uned during this operation **nflblank samples from each roll were sent uo the laboratory "Co be processed* Theresults are given in Table 1,It was decided early in the operation that a campling time of approximately J30 minutes would be sufficient to obtain values substantially above filterpaper background for reliable radiochemistiy.Table 1« Background Contamination on Blank Filter Paper MRoll NumberTotal Counts Per Minute1 269 •2 203 J|2 130 m3V55881mk 73 g5 133 *6 53iiiTestsTo insure that the air samples collected over a specific area were notcontaminated in flight'to or from the sampling area a leakage test wasformed on each air sampler» Each aircraft w^s flown with one sampler closedI1i.g.i•