100 py and breadfruit) are not growing nowon TTT all of the northern islands, the ubiquitous a 376, b Messerschmidia and Scaevola were sampled and analyzed extensively with the o 79s, Concentration — pCi/g, dry a 10 a intent that they be used as "indicator — species" for estimating doses from the A a 4 a ‘ 4 b a edible plants should they become avail- a a4 able, & Te s 137 ax a4 o o OO.) same location is shown in Fig, 168. 0 0 To increase accuracy, dose estimates o Bo Cs activity in coconut meat and Messerschmidia and/or Scaevola from the a 4 The correspondence between Oo to the human population through the aa terrestrial vegetation pathway should be a based on the geographical distribution of o° 8 O.opL tut tt 5 10 15 20 radionuclides, Oo ol 25 30 35 In order to do this, how- ever, a correlation between nuclide 40 45 content of vegetation and nuclide content of soil must be established. Island number As an ex- ample of the correlations that have been Fig. 167. Concentrations of 90... and 13% O6 in coconut meat. developed, data for 37a in Messerschmidia and Scaevola vs los in soil are shown in Fig. 169. Similarly, data obtained from rats — the only mammals now found on the Atoll — sare it Concentration in coconut — pCi/g, dry. were found to correlate with the vegetation radionuclide levels, 100 I 4 Messerschmidia oScaevola ( “qo correlations for a 137 For example, Cs in rat muscle vs Messerschmidia/Scaevola are shown in Fig. 170, and for 405, in rat bone vs 10 _ Messerschmidia /Scaevola are shown in Fig. 171. 1.0 Y = 1,27 x9-612 Three classes of data obtained from _ the terrestrial biota survey, therefore, oa 0.1 0.1 | 1.0 _] 10 l 100 have been used to estimate potential human doses through the terrestrial food 1000 pathway: Concentration in indicator plant — ® eCi/g, dry Data obtained from the edible organisms where they were available. Fig. 168. Statistical correlation between 375 in coconut meat and 137Cs in Messerchmidia and Scaevola. Data obtained from the correlation between edible plants — indicator II~32