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oe
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uo
29 corrected countea mtr mint mar Eitan ws es of ep soem eta
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eorrections for ce ihe ee shee yumee ceeee yg
CriSaa ileal ode Sica
most samples was so low as to prevent such evaluation wn arenieney
Furthermore since the nuclide composition varied among plants and even
within differeat sections of the same plant, a blanket correction was ime
possible,
The gross gamma activity of these samples is shown in Table A.l,
Appendix, The activities corrected for the counting efficiency of Co?
are essentially the same as those calculated for the beta activity. The
exceptions are portulaca, the leaves of arrowroot, and the coconut palm
where the beta activity w:.3 consistently slightly greater than the gamma
activity. Data presertca in Chapter 3 show these exceptions are expressions of the nuclide comp»:ition,
Portulaca was manyt..:es more active than other plant specimens
recovered from the sa:v.c island. Leaves of plants were generally more
active than their fruit counterpart. The fact taat surfaces of leaves were
not decontaminated prisr to analysis may pene at least in part for
this difference,
iM
‘
Three stages of coconuts - green, ripe, and sprouting nut - were
analyzed. Both green cid ripe pandanus keys were examined. No distinct differences betwern the stage of grovth and activity were discernible.
Where possible the meat, mils, shell, and husk of coconuts were
analyzed separately,
~. “shin the limits of the analysis, the3 GENIAL appears
equally distributed 21 --g these fractions.
The order of plan: activities relative to th: igland from which they were
recovered was: Gejen > Sniwetak , Eniaetck > Rongelap > Sifo,
Utirik > Likiep. ‘i hese results agree weli with the activities of the res-
pective soils as shown in Table 2.1.
r
An accurate comparison of the gross beta activity of samples analyzed
in the current survey with the data secured one year ago was not possible
since self-absovztion torractions were aprlied in the previous survey,
It was, however, interaating to note th-t, although ssuch corrections were
not made, coconuts exhibited greater beta activity in the present study.
Water
The gross beta activity of well, cistern, ocean, and lagoon water is
shown in Table 2.1. Gamma measurements of these samples are recorded
eo ee ee ein mee = 5
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oa
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This finding, as wil! be discussed later, suggesis that coconuts possess
an unusual capacity to concentrate a ccrmponent of the residual activity.
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