oe ene eaewet APPENDIX B DATA SUMMARY __ B.1 EXPLANATION OF TABULATION Table B.1 consists of a summary of data from all stations that comprised the routine gummed paper network for Operation Ivy, under the following colum headings. a. Station: Identification of station. Where samples _ were collected at two locations in one city, both leca- tions are listed, e.g., airport and city offices of the Weather Bureau. bv. Period of daily record: Beginning and ending day of Gaily samples are listed. Some stations exposed a few papers at irregular intervals after cessation of daily operation, but those dates are not listed here. c. No. of missing days: These are the number of days withinthe period of daily record on witich no radio- logical data is available. a. Frequency of precipitation a: This percentage is ‘based on the number of days radiological reports were received and represents the fraction of days on witch rain oocurred (including a trace of rain). e. Date of first arrival: The date of arrival of significant activity for this purpose is arbitrarily defined as the first day on which at least 100 d/m (extrapolated to collection day) was reported. Some stations never reported this level of radioactivity. In those cases, the first arrival is defined as the day _ of marked increase of activity above background. footnote (1), Table B.1) (See f, Maximum activity, d/m-precip. date: The radioactivity extrapolated to collection day and the date of the highest single gummed paper at each station and the reported precipitation associated with that sample, "M" means precipitation data is missing. In a few instancesthe maximum.was unreasonably early so the secondary maximm was chosen as the actual maximun. nN - 136 “