no
.
There ile S@re 2. dence
a;
te
om
co
\~
‘
flat
ee
Nw
ere
- TURE:
yo.
o,
~
ijl,
othercid trersdlaticn from I
13 OMriy
Lelf as effect ..-: as x-.rraduateocn
(2 orcdve nz thyroid cancer in
rats, but it {$8 unkncun whether this relatien also applies tc the human
infant.
Tie credicned numbers or teyrcic cancers
in Utah children are
tabulated in Table 5 I_r beth a relative biolcgical effectiveness (™.B.E.}
ef Ll and a R.D.E.
of 3.1.
These values are compared with the number of
“spontaneous” cases exvected by aze 15 years.
Children are arranged by
age recognizing that some children were irradiated at age 0-1 and again at
age 1-2.
rarily
Irradiation received at age 2 and older has been assumed arbit-
(aithough pernaps incorrectly)
to be without effect.
Table 6
AGE
IN 1963
13
12
Ll*
io*
9
8
7
6
5
y
3
2
1
0
PREDICTED THYROID CANCERS IN UTAH CHILDREN
NUMBER OF
EST. AV. TH.
PRED. TH. CANCERS
CHILDREN
DOSE (RADS)
RBE = |
RBE = 0.1
20,000
0.4
“?).16
0.02
20,000
4.2
1.68
0.17
21,000
10.1
4.24
0.42
21,000
6.3
2.64
0.26
22,000
2.0
0.88
0.09
22,000
2.0
0.88
0.09
23,000
8.6
3.96
0.40
24,900
10.0
4.80
0.48
24,000
1.4
0.67
0.07
25,000
0
0
0
25,000
oO
0
0
26,000
1.0
0.52
0.05
ar=
2)
0.52
0.05
“
Q
0
0
0.95
0.10
6.4
21.90
:
"SPON."
9.4g"
0.44
0.47
0.47
0.49
0.49
0.51
0.53
0.53
0.55
0.55
0.58
0.60
0.60
0.02
2.20
5.57
foal’ mumber of fallout-induced thyroid cancers is 22
(for an R.B.E. of 1) or 2 (for an R.B.E. of 0.1).
These would be in add-
ition to the 6 "spontaneous" cases expected to develop in this 1/4 million
children during their first 15 years.
The large number of irrediated
children provides a rare opportunity to test the hypothesis that small