SLIDE 1
The BRAVO device was detonated on a sandspit near
BRAVO Cloud Dimensions.
It was a
Namu Island, Bikini Atoll at 0645 March 1, 1954 (28/2/54 1845 GCT).
The upper limit to cloud height was 40 km (25
17 MT thermonuclear yield.
miles). The diameter 10 minutes after the burst was 110 km (70 miles). The
fission/fusion ratio was estimated to be 0.47. It was the first in the Castle
The second shot was 100 KT and occurred 30 days
series of experiments.
later.
The next three shots were 150 KT, 9.5 MT and 10 MT respectively. The
9.5 and 10 MT shots may have contributed some fallout at Rongelap and Utirik,
perhaps as mich as a 8% of the surface activity. These later shots occurred
after persons were evacuated.
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Upper Limnt,
Cloud Height’
fem Diometer
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BY
“Jo
7
Time, Minutes
Cloud Dimensions:
Operation CASTLE + Shot 2 - Bravo.