~ 22 27 ppe Sr-90/g Ca compared to 25 Re Sr-90/g Ca based on dota
availeble in the summer of 1955.
A number of individuals have raised the cuestion as to
whether a discussion of average fallout values is adequcte to
define the upper limit of hazard to people exposed to unusually heavy fallout.
In this connection it
is worth noting
that as the data continue to accimulate from every corner of
the globe the deviations from everaze that cre noted cre
the deviations in the safe direction.
Wherees fallout values
are rarely reported more then twice the meen for eny given —
region, it is not uncommon to observe veiuce wich crs of the
order of 10% of the everage.
Our final problem is to estimate the burden of Sr-90 which
will be attained by a population whose principal dietsry source
of Ca contains 25 pnc/g Ca.
As has been noted by previous
speekers, it is known that human metabolisn involves some measure
of discrimination against strontium end in favor of ealeiun.
Based on the data now available a child being nourished on milk
conteining 25 ppe Sv-90/g Ca would be expected to develop a
skeleton containing Sr-90 in scmewhat lower concentrations than
this value but probably higher than 10 ppe Sr-90/g Ca.
‘Thus
10-20 ppe/e Ca may be said to be the hichest foreseeable velue
that will be etteined by the populetions of the future fron
nuclear devices detonated up to late 1956.
& value of 15 ppe/g
Ca will be teken as a besis for discussion.
2