Comparisons of measures oxposure rate uy at these sites. ne ek Majuro with those at Kwajalein, Wotje and Ailuk Atolls in the Sle Ll} contention; however, tend to support this firm conclusions must await the publicaNorthern Marshall Islands Radiologica? 2 is [Tt should be noted that exposure rates meas tred at Rongelap and Utirik Atolls, respectively, in the northern and northeastern Marshalls are significantiy higher than and southern islancs. the central x Rongelap and Utirik are known to have een contaminated by the Bravo Virtually all of the those in Test on Marcn 1, 1954, and contemporary incremental exposure rates above background at these sites is attributable to residual '?’Cs contamination in the soil and vegetation. The reconstructed exposure rate at Majuro close to the measured value. (Table 35) is reasonably The difference is attributed to the exposure rate contribution from “°K in biota (for which no assessment was included in the calculated value}, ties in the soil analyses. and to uncertain- Tables + and 5 vresent similar analyses for Ponape and Truk, both high vo group to the west of the Marshalls. nic islands in the Caroline These islands differed From Majuro by virtue of the contributions of the uranium and thorium chains in their volcanic soils, and their higher annual and calculated exposure rates at Truk were excellent. The significant difference between the two values at Ponape is attrioute2 orimarily to uncertainties