D.
The Aspect of Lagoon Contamination.
Prior to the Operation, a considerable amount of study was
devoted to the problem of contamination of the shot-atoll lagoon
and the possible disruption of surface operations as a result.
Con-
’ sidering the shot schedule and the flushing mechanism of the two
lagoons (Eniwetok and Bikini), the primary problem of ship operation
seemed real only at Bikini.
In general, it was assumed that the
problem would be more an operational nuisance than a health hazard
and that ship operation could begin by H plus 24 hours.
The even-
tual situation relative to lagoon operation was as predicted except
that the bulk of the water transport of fallout was horizontal and
downward.
Very little, if any, upwelling of radioactive material
occurred.
On all shots, except | SHOTS (Rud S; , ships were able
to re-enter the Enyu anchorages by approximately H plus 6 hours.
Following S#or 4, ships were kept clear of the lagoon until shot
day plus 1 and following (swor 53 re-sntry was delayed until H plus
10 hours.
,
For additional infcrmation concerning CASTLE radiological
safety, refer to the JTF SEVEN Final Report, RadiologicalSafety, |
Operation CASTLE, dated August 1954.
197