It was hough thet the redtoectivity in the samples of Asparagupeis we ‘a cotlected ia early March might be due to 8 short half-life iectape reeait tag from ths: teet ef March |. 1054 at Bikini. ia order to vorivly this aseumption series ef counts for determining radicective half life were taitiated at the Emiwetok laboratory. Duplicate sampiee were seat to the home laboratory at the University :( Washington for more complete analyses The revelts of tests conducted on samples collected at Eniwe. tok and Roagelap Atolls from March through June are gives in Tabie 0 Plote of the radioactive decay uf three samples of Aepaeragopeis are shown ia Figure | Discussion ~ ab The reeatts of the half life swudies aad re@ochemi: a! saslyses® indi cate that at least 90 percem of the radicectivity in Asperag psis was due to 1'31 The half life of the isotope coatributing #0 percent of the radiv activity 1a Asperagopeis was found to be 7 6 to 8 S days TWis compares well with the accepted vaise for 1!3! which is gives as 8 14 days (5). The lowest values obtained at Eniwetok may have been due t. the presence of Cheadraia et al (2) and ia as follows The éried signe were heated several miantes with NaCiO aad 0 1 8 NaOS conteiniag iodine carrier (added as Ki), Nitered. and discarded The toding ta the sulutiua was reduced with hydro. sylamine hydrochior.ide. extracted iato CCl, end re-extracted \ato water comtaining a little Diewlfite The sequeves solution was acidified and treated with sodium aitrate The estrection into carvee tetrachiveide aad \ato water was repeated The twdine wa. precipitated from the reeultiag solu tive as ailver iodide and counted in an iaternal gaa flow couater