BRAVO test. These data, ‘eogerterwith“appropriateconversion’tasters‘and:Living’ hte pattern models, provided an eutimate of external dose ‘equivalent. METHODS 2 Tetpe hea ae oe Ape alpe al eae en = oe : : Exponentially declining activity concentrations have been observed in surface soil for 137, 129, ond and Utirik Atolls. Sr from 1954 to the present on Ronge lap Dec lining:activity concentrations have: also been observed in vegetationat a rate greater than that predicted by radioactive:‘decay. poe RRP TTepmeneame ata ry Thus exponential decline in dietary activity was assumed andthe folowing general equations were derived. . “| ” Jeo FY Yo (ri KiXi “nk ypews wee 2 -a . Vera © ‘ageUXiRi Xie 2some e Cathey S ‘Ae. t* or 7 | (1) cy i 1Gfe q- a? (ti or,” ae oF 90 Nee ee eee om phat ode ° — f£ Xi bi KK (e “(tkge B -e Heke 7 agi i } ’ (2) My 2 + : and : D= £),P° 5. “is K.-K. —(44Kj) (K,+d) eTOAPREDE + (youg) an (K;+d) ae —(\+K; Dt. tae ls Tee, Ute me 3 * ©) L a ees ME where = 4 6 “8 os +e Rey * ei ee goog noe de, mete . . _ F sh eae BeEE Yip eigences ere ony avesvyBaty : ee te tab *