APPENDIX IIT IODINE SAMPLING PROGRAM During the 1958 EARDTACK series at PPG e new type of sempling was intrcduced to study the Todine-131 concentration in air from fajlout and to determine the possibility of such sampling in off-site monitoring for e test series, The iodine sempling progrem was carried out on the five popur lated atolls Eniwetok, Wotkho, Ujelang, Utirik and Rongelep, Since iodine is geseous and is not trappec by filter paper e low volume air pump was used which pulled eir thrcugk a cartridge filled with activated charcoal which will collect gaseous iodine, The intake end of the cartridge also has a iSA filter to collect any iodine that might have been deposited es particulates and to prevent the other perticulate activity from entering the charcoal filter, These cart- ridges are then ccunted by use of a single channel analyzer and the iodine concentration extrapolated back to the end of collecticn, The results of these data have been tabuleted and are attacied, These data will be studied further to determine pessible correlations between external gamma levels, gross air-borne perticulate beta, and I-131 levels,