tnat from carbon-t+,
a
Ociouer
Qo,
Ga
Sutow and Conard
ne
G66
the doses from which
are celivered at extremely iow rates over a
wis
Lie
tune.
In o the bedy where
he
the nuclide concentrates
argc wth
-AYDOrn-.t
in the thyroid giand.°7 347) Alour 3 to 10
per cent of the [7% ingested by cows ices
milk consumpiion, the tnvroid giand of chil
Gren concentrates much more iodine than
that cf acults.
Fetal thyroids contain more iodine-12%
than inaternal thyroid glands on a per gram
bon-l4 in the
cifferent carbon
re,
sohere, sure
e
ans),
2s DEAK ENCCSS
of carrbon-1-t wctivitv ac about 7. per cent
has been predicted in 196+
sevel will then fall
or
weignt basis.) *2 The most critical age in
postnatal life In regard to dosage has been
estunated io be between 6 nmionths anc 2
years of age*) 3? Thyroic doses “Fon roll
out iodine-i3! in infanis calculated on the
+
+
7
Dasis oF Oe7
akier O.
:
th,
iresi animal walk
con-
LO ine Lota)
Covidua,
LOGY
GQurin hls
mic LV.
aug CUMMHQUVE
mere elect
offers Over
auar a
serene
eRerstign
genetic
numboes eo
Go.
yeneratlons
e
bowev ry,
Tnay be significance”
Aciauve
Visas.
Dac
sONYgr vad
isk
260d
dose that will be de
7
G
oo
.
bP
-
a
to
Co
to
y
C
,
c
rc
v
Q
“
=
ele
rm.
0
ne
7
ro
Go
“
t
rt
o
2
ms
rs
ot
a
rallout has Beer expressed iy wimis Gf Gose
QO
and 1965, respective
relauicnesio of sadiailun duse lo Uiyiuid car
Cinogtnesls Lave Deen made on clinical and
epldeno.ovical data from populations with
known exiernal irradiation by doses in the
therapeutic vange { SU r to 5,000 ae
Cruce risk estimates for thyroid carcino
genesis, based on iverage follow-up tiae of
10 vears und thought to be valid jor acute
irraqiation of clilcren only in the exposure
ranve oi 1u0 to 300 roentgens,**? have been
caiculated to be 0.3 to 1.6 cases per 10" exposcd ponulation per year per roentgen.”
A risk estumaie of Ligh magnitude (35 ver
y
iO" per rad) also has been Gerived*! Reports concerning association of iodine-.5i
as an average for
the world popula
relevant issues
Guring the com
matcrial introduced
dino ine oemvironinent. 7"
fallacies
2AiGue
:
1g
toto
wincal
+
Natura,
papiiaciqe
PAGIAUON
period of time cur-
oot
ar
raquinucon Woula 2ave ic
scarce?" The risk of thyroid cancer from
be Goubled to give 2 Coase eGudi lo Luc dose
comminnens”?
Caiculated in this wav, the
veriods equal approxumaicly 9 moniis ior
internal exposure to radioiodine has been
estimated to be one-tenth that from exicrna!
the vonuads, 32 monihs for cells Hning the
bone surfaces, and 20 months for the pone
xehradiation?? The substitution o. PaG10jouine-freu mulk (canned or shipped milk’
miarrow.?!
Yae Likelihood
resulk of Cusomic ft
tests Of weapons
ta
ro
midiec bY the Fed
hee During
and ma‘ignant tumors of the thyroid are
oO
he
©
r
r
me
°
D.
on
..3
OQ
recoramended
&¥.
been
a
“
and Ue ieecing of stored iced vo catue nave
when
criticaly
hi
-
eo den, lsu
My
ave
Toe
Gelecica.
4 ic
b
Bo
"
oO
oO
©
we
G
om
id inorganic thyroi.-piocxing agents (such as locides. perchlorides, anc
srudied as a countermeasure for sudden high radioiodine contaiminadon evenis.?
Caruon-i-.. Tac long-term risk is primarily
Unt &.0.006 Peron
mated ntianber of cases cousea bY nature
caciation ure O to $4,000 zor leukemia and
O to 14,000 for bone cancer.