[| USDOEA
j
, Pa document consists ef
OMM™.
t
FL of
“ae
-"
er, i. D., Director
SAE?
Biology and Mecticine
i
pages
September 16, 1954
ey, Biophysics Branch
Biology and Medicine
“~
COMPUTATION OF I-131 DOSE IN HUMAN THYROIDS RESULTING FROM CASTLE
FALLOUT IN U.3.
SBP: RAD
BEST COPY AVAILABLE
Dr. Dunning has asked me to computa for you from the svailable
data the I-131 dose in human thyroids resulting from CASTLE
fallout in the U. S
I estimate the total dose to have been
less than 1,5 rep, as compared with the
sible dose per year of 15 reps (0.3 r
+ maximum permis-
S|
wi).
The basis of the caleulation was as follows:
Observations on: thyroid Activities
1.
LeRoy measured | human thyroids. fron Chicago antopsies by
scintillation counting,
ranged from 0.5-1.6 x
of July 12, 195h, activities
/em. dudging from half-life,
the activity was quite
tealy I~131.
hr. Dunham believes
the Jocal hospital I-131 contaminationaight possibly be the
source, rather than fallout.
2.
Harley measured 1 human thyroid from NW, Y. after digestion
and dhemical separation of I. This. technique gave high
sensitivity but Harley is not positive of 100% recovery. So
I-131 was demonstrated, and an upper limit of activity was
estimated at about 2% that observedby LeRoy.
3+
Looney and Colodzin at MMRI measured several human thyroids
from Washington by scintillation connting.
‘Their results
_ a
valne.
.
kh, Hardin Jones has observed I-13] in the urine of some patients
in San Francisco, sone in other patients, His figures are
not yet available to me.
|
opt
gouupu Aub
ce
were negative, with an upper limit of about 5 LeRoy! s
[ORNL ED 2;
“oy
#&=
6 Cantos, Series 4
-
f
RG _ toe thle,
Collection +
~
eé
5. Yan Middlesworth, Hardin Jones, and others measured the
activity of cattle, sheep, hog, and dog thyroiiis in June.
o
On cattle and sheep their resulta (extrapolated to July 12,
a
Middlesworth found hogs and dogs to contain much less
i
LeRoy's data) were approximately the same as IeHoy's,
Van
OFFICE p> _puppfounddogs "approximately as nigh ie aw
-
DUDLEY: MMack
SURNAME & |...91.6/5),
DATE ®
{. - 0 -
™ AEC-318 (Rev. 9-53)
MIAAP.
DANI/
a
= all
a
UG, 5. GOVERNMENT PRINTING OFFICE
16—62761-3
MANAG
.
ENENT -
Af
“oe
BOE ARCHIVES
=