easterly along
(3)
the island). In addition,
a tower shot having a
yield, was
surveyed forcrater size. The results are not available at this time.
Jeeps were exposed on three events in an investigation of the response
of drag-sensitive targets. Good results were obtained and will supplement
the damage~prediction curves by including the blast conditions resulting from
these particular types of shots.
Water-wave studies were made on the megaton-range devices. Instruments were placed to document the Bikini Lagoon waves, and at distant
locations (Ailinginae and Eniwetok Atolls, and Wake and Johnston Islands) to
record the long-period ocean waves. Microbarographs were operated at
Wake and Johnston fo investigate the possibility that these long-period waves
are air-coupled ‘SMhsiderabis inundation photography was taken. Wave
action from euler: the Bikini Lagoon was less than expected, since the
crater did not breach into the ocean or the deep channel and, apparently,
there was unexpectedly great convergence and dissipation onto the near
{slands of the Eninman complex.
These results, based on preliminary analysis in the field, must be
considered as tentative. Blast records will be re-examined and reanalyzed
at the laboratories. Photographic analysis cannot be accomplished at the proving grounds and must awaitlaboratory study.
However, a general statement of the accomplishment of this program
can be made: With the exception of the WMA in which the drop error
affected the results of those projects participating, the objectives of the
Program 1 projects were carried out. On all events a high percentage of
instrumentation successfully operated at and through shot time, recording
reliable data.
Blast data have been obtained which will supplement existing
information. These data will extend presently established curves, and will
strengthen the knowledge of blast phenomena in areas heretofore only
meagerly instrumented or not documented at all.
2.1.2
Program 2, Nuclear Radiation and Effects
Program 2 was concerned with the distribution of radioactivity in the
cloud resulting from nuclear explosions and the subsequent fallout of material from the cloud and with various nuclear radiation effects.
Gamma ion chambers were fired into the cloud by high-speed rockets
and the resulting gamma-rate data were telemetered to recording stations.
Preliminary analysis indicates there is comparatively little activity in the
stem region and that cloud activity is in the lower portion of the cloud.
Destroyer escorts and the M/V Horizon were used to delineate the
fallout pattern over water and to study the nature of the transport and
- 29 -
ewes
a *
Z£7