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An extensive radiation survey of the islands of Bikini
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Toth meets
Atoll has revealed several interesting features of the
residual environmental radiation fields in *heavy Tecan AyEE
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fallout area a number of years after the initial depos ition:
| ‘Bikini Atoll»is the former weapons test area in the mid—
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Pacific where more than 20 nucleartests: were conducted from.
1946 to 1958.
The survey, conducted in May 1967,
included__
measurements of the external radiation levels and determina- ~-=.seeee E-
tion of the principal isotopes contributing to the total
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external exposure rates on each island of the atoll.
Because
of the high intensity of the radiation fields generated by
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the tests, we were able to detect at the time of this survey
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many Long-lived fission and activation products which were
7
undetectable or unnoticed in previously surveyed fallout
areas because of their trace presence.
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It was also possible
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to relate the residual radiation fields onthe atoll to
various locations of test ground zeros, to ‘meteorological
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conditions affecting local| Fallout ‘at the time of the tte
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and to weathering and radioactive decay processes occurring:
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