898
SESSION IV DISC USSION
RIVERA: This 0.35 was sort of a value for the whole year. It took
into account not only Dr. Beninson’s data but also our data and those
’ of Loutit. We also took into account turnover during this time; therefore this was sort of an average effective discrimination factor for the
year.
BENINSON: The values I presented did not assume any turnover.
If 50% turnover for the first year were used, as Mr, Rivera has done,
my data would give a value of about 0.4 for the discrimination factor.
RIVERA: There is the most interesting question when weget
sufficient data that we want to investigate; i.e., will this discrimination
of 0.35 also obtain during adolescence? The few data I have seem to
indicate that discrimination may diminish at adolescence and reach
this value. If we could find some animals that had an adolescence,
maybe we could do some experiments with them to see if they have
diminished discrimination during this second burst of skeletal growth
rate.
TAMPLIN: Mr. Hardy, in the Rongelap study the *Sr was estimated
from urine levels as 12 nc. How was this done ?
HARDY: Do you mean how was the body burden estimated from the
urine data?
TAMPLIN: Yes.
HARDY: This calculation was made by Dr. Cohn at Brookhaven, ”*
using assumptions described in a report by K. T. Woodwardetal.t I
do not have these references with me and am not prepared to describe
the calculation.
LENGEMANN: Mr. Hardy, in your study using the Rongelapdiet,
your data showed no return to the control level of radiocesium in the
urine and feces when the individual was shifted back to his usual diet.
Yet for radiostrontium there was a return to normal. You attributed
. the failure of the cesium level to return to the control level to a rise
in the cesium content of the usual diet of the subject. Wouldn’t you
expect
an
increase also in the radiostrontium in the normal diet,
leading to a failure of the urinary and fecal strontium to return to the
control level?
*S. H. Cohn, Metabolism of Fission Products in Man: Marshallese Experience, in Diagnosis and Treatment of Radioactive Poisoning, Symposium Proceedings, Vienna, 1962, pp. 235-251, International Atomic Energy Agency,
Vienna, 1963.
+K. T. Woodward, A. G. Schrodt, J. E, Anderson, H. A. Claypool, and J. B.
Hartgering, The Determination of Internally Deposited Radioactive Isotopes in
the Marshallese People by Excretion Analysis, USAEC Report DASA-~-1180,
Walter Reed Army Medical Center, Institute of Research, 1959.