BRAVO test. These data, “together with. appropriate: conversion\factors‘and: living’ a pattern models, provided an estimate of external dose. equivalent. ig “ & ony ok METHODS Exponentially declining activity concentrations have been observed in sur- - ‘Hin face soil for 137¢,, 129, and 905, from 1954 to the present on Rongelap and Utirik Atolls. Declining-activity concentrations havealso been observed in vegetation at a rate greater than chat predicted by radioactive:‘decay. pT TI EE repens een ony Thus exponential decline in dietary activity was assumed andthe following general equat ions were derived. . ° € boo ' . 5) KiXi e =(\ 9K, uvUe! fy - q* “Ex 7 : 4 eet aSR con Ye ocCatk sony COMPA! (eprgertsis, (GO* Us ? “ e er + G c aoe f) is aae ir AMRRIE Xi Ce a Ker, . de * : a i4 vr, (2) QmARKES i, yi & 2 : i ae a “{ OG ;5 eek aN Pe a) og e “4 : 5 o ‘ t and as ; IE d) e m(,tKj) (K , p° 5 D*= £, eTAP + (atkg) on a)KE(K i K--Ke ai d + a? 2; “(\tKy)e, i (3) [ne ORE, a Thee a where e Pe r es granny wh ag igen)itt Sojeveri etree a a a?