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developed same evideme that the uptake of radium is dependent gm exe —
changeable caloiva in @ mamer similar to radicatrantium and barium, In
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order to further explore this possibility, the soils from five pastures
were analysed for radium, «as were the bones of the livestock, [The data
obtained ere plotted in Figure 10. Radium determinations could not be
completed on the Tifton sauplez because these arrived too late fo permit
putld up of daughter product activity following soparation of tHe radiu226, ‘The four ratios obtained when plotted against reciprocal drchangeable
saloium do not showas clear a linssr regrezaion as was trues fox
strontium,
This my be dus to the fact thet radius dose not behave as stromtius does,
er to analytical difficulty with the low radium soncentrations ih soil.
Tre results are not completely discouraging and further work seems
c
indicated.
rison of Radiostrontius in Various
BoYogioe! Materials
huong the various mterials which have been analysed for rad{oetrontium
are same Which have in common the fact that the isotopes originaked to a
large extent from scils in the region of southern New York and nprthern
New Jersey. ‘These samples inciuie the lsnbs and astves from pasgures at
Ithaca and Rutgers, the New Tork City milk supply, human milk ank etillborns from the metropolitan New York area. For the last two kings of
semples, the primary origin of the redicsetrontius is, of sourse,iin doubt
but in human milk and stillborn alile there is likely to be a latge con
tribution of onloivm, and therefore strontium which has its origin in the
soils from this area.
Table 10 summarises fheposults of analysis of these mterials,
be noted that the Sr
are of the sane order.
jIt will
activity when expressed in d/nin/em ofloaloim
This 1g again a test of the constancy of the caloiumradiostrontdum ratio
in oaloium obtained from various places in the biological feeding
chain.
Thsse samples have in common the fact that in one way or ancther ithe
caloiu@e was derived via vegetation, the calci umrrediostrontium ratio of
which was determined by the oumulative fallout in the geographical] area
and the exobangeable oeloium of the soil. 4 more liberal sampling program and a more careful study of the dietary habits of humans in jth
area etudied seen indicated,
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P
105170549
00131986.030