Operation IVY,
of
conducted at Eniwetok in November 1953.
these measurements
present in
highest
the
showed
Pacific
Evalustion
that only very low radioactivity was
Islands.
Outside Eniwetok Atoll the
reading was approximately 1.5 milliroentgens per hour
of gamma radiation 60 hours after the first detonation.
sampling unlts
set up at a number of
Air
islands were not activated
since fall-out did not reach the minimum measurable value of
OLS :milliroentgens
per hour,
In
the United States,
observations
disclosed air activity 500 times above normal at Hanford,
Washington, but this value declined quickly.
Neither this
amount nor the much lower values measurcd elsewhere in the
United States
constituted a health hazard.
Operation UPSHOT-KNOTHOLE.
4,
Fall-out data.
UPSHOT-KNOTHOLE,
The first & detonations
of
Operation
the current cpring tests at the Nevada Proving
Ground, have produced significantly higher fall-out than those
of
previous
sertes.
from tower shots
The
relatively heavy fall-outs
of higher energy yield than
continental tests.
5.
These
those
&
resulted
in previous
(See Part III, Weapons.)
highest
gamma doses
Location
in populated areas were:
Population
Riverside Cabins, Nevada
13 weeks
Gamme dose
Lifetime
(roentyrens)
14
7.0
11.0
200-300
5,5
8,0
Lincoln Mine, Nevada
200
3.0
3.8
vo
Rockville, Utah
300
O21
2.85
‘
Bunkerville, Nevada
6.
standard
These
of
.
values may be
3.9 roentgens for
compared with the
Commissicn's
13 weeks as a maximum permissible
dose.
- 59 -
Part VI