pOacne
~
vee
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IR
-
-S5-
.mte syatee has 8 background of abcut S@ counts per sinute
ae
. m@ an efficiency of approstimetely 3@ per cent based on p2z_
The coun. 3 for biclogical semples were comverted to disinteqratioms per minute per gram td'm/g} cf wet t:esue and the
counts for samples of teland e011 and >ach sand were com
verted to d/m’g of dry material et t:me of counting by apply
tag correction factors for sample we.unt,
countew efficiency,
anc sl f-aensorption.
The values for gross peta activity itn the
appendix
tables are civen .: d’/m/g pilus Or minus the % per cent
counting
error,
which was obtained from nomograpt:s based am
the rat.o of the counting rate ond total time of counting of
tie sample to the counting rate and total time of counting
of back rou: ¢
tables,
(F.nsman,
1957).
The valwee in the summary
Tables 2 and 3, however,
havea‘een calculated in
terms cf miccomicrocuries per gram fule/’g) of wet tissue.
The samples collected :n 1353 were analyzed for gammaemitting tsotopee with a 3 x }-inch sodium iodide crystal
commected to a Raliation Courter “sporetary 256-channel anelyzer.
The radioisotopes present
in the sampies were tdenti-
fied by their gamma energies anc for some of the zamples the
amount of seech radioisotope was determined
ene
-
by & suctractive
sane