TABLE MAXIMUM RADIOACTIVE DUST CONCENTRATIONS EXTTAPOLATED TO SAMPLING DATE (d/m/M}) ~ 180 175 2440 WoO 0 Airport City Chicago Detroit Tpailanti San Francisco Airport City 1440 Uyho LO 1440 Alrport City 14ho Uh Los Angeles 1440 o 0° Midway Kwajalei. Truk Ponape Rochester, N.Y. New fork Who 4,80 120 os WOMWOWW e Special Activity Who 120 Guan Air Base Sampling Period Min. Mes wo wpe Honolulu Airport Special Days after MIKE nN ow Station — 2.2.6 Decay Rate Decay rate data for 23 gummed paper samples yielded an average value The values of the decay slope calculated from counts of two filtered dust samples were ~ 1.19 ami - 0,95. for the exponent of the time of - 1,37. In Mgure 2.13 the activities of typical samples are plotted ayainst the age of the material (days after MIKE). We have not discovered the cause of the regular fluctuations, We are unable ta rule out the possibility that 4% 48 due to some unimown bias in the counting procedure. The value of the decay rate exponent was the last piece of information obtained. It was not used for extrapolation which was based, instead, on the conventional exponent of - 1.2. Fig. 27 fey ]= -~ 28 + Mg