time of entry. This time delay was caused by the pradtice of issuing film badges at Eniwetok and developing
the film at Bikini and by a lack of night transportatjon
in the lagoon.
The practice of entry control by film—-badge exposqres
left much to be desired, but it was the only method afail-~
able in the absence of reliable self-reading dosimetric
devices.
The practice of issuance and development of}film
badges may have penalized many individuals because offinherent inaccuracies of the film badge in the presencefof
low-energy radiation and low dosages.
PRE-EVENT SAFETY MEASURES
Hazard Zones
A security zone, 150 x 300 nmi
(278 x 556 km), was established around
Enewetak and Bikini prior to CASTLE (Reference 26),* and this also served
as a radsafe precaution area.
The area was patrolled by P2V
fhircraft and
destroyers to assure that no unauthorized vessels were present.
also diverted shipping from within a sector 500 nmi (926 km)
The Navy
From ground
zero in an are extending from the southwest, clockwise to thefeast.
volving primarily U.S. shipping, this was done on all shots
H+24.
In-
fffom H-hour to
‘
After BRAVO, maximum cooperation with other nations was
trol shipping in the hazard zone.
ught to con-
The area was officially ddsignated a
danger zone and redefined as the sector centered on 12°N, 16 PE, from 240°
clockwise to 95°, with a radial distance 450 nmi (833 km).
subsector
(designated Area Green) was defined as the region bounded by 10°15'N,
16°40'N, 160°10'E, and 170°20'E, which was subject to more itensive air
and sea search prior to a shot than the rest of the danger z@ne.
tionally, all U.S. shipping that passed within 600 nmi (1,11]}
kini came under the operational control of CTG 7.3
Addi-
km) of Bi-
(for rads&fe diversion
if necessary).
* The area was bounded by 160935' to 166°16'E and 10°15' to posse
107