This report is intended as a resource document for the eventual cleanup
of Bikini Atoll

and contains a summary of the data for the concentrations of

137¢cs, 90sr, 239+240pu, and 24]aAm in vegetation through 1987 and in soil

through 1985 for 14 islands at Bikini Atoll.

The data for the main residence

island, Bikini, and the second most important island,


are extensive;

these islands have been the subject of a continuing research and monitoring
program since 1974.

Data for radionuclide concentrations in ground water,

cistern water, fish and other marine species, and pigs from Bikini and Eneu

are presented.






resuspension and rainfall data from Bikini and Eneu Islands.

of our

The data for the

other 12 islands are much more limited because samples were coilected as part
of a screening survey and the islands have not been part of a continuing
research and monitoring program.

Cesium-137 is the radionuclide that produces

most of the estimated dose for returning residents, mostly through uptake by
terrestrial foods and secondly by direct external gamma exposure.

measures for reducing the !37cs uptake in vegetation are discussed.


In the fall of 1978, a radiological survey was made of Bikini Atoll and
11 atolls or islands east and southeast of Bikini.
are located in the general

These atolls or islands

direction of the fallout pattern that originated

from the BRAVO test on March 1, 1954 at Bikini Atoll (Fig. 1).
This survey, referred to as the Northern Marshall



Survey (NMIRS), was planned to be an aerial radiological reconnaissance to map
the external

gamma-ray exposure rates over the

islands of



However, an earlier dose assessment of Enewetak Atoll] (US AEC, 1973; Robison
et al., 1981c) and a preliminary dose assessment of Bikini



et al., 1982b) indicated that the most significant potential exposure pathway
at the contaminated atolls was the terrestrial

food chain.

Therefore, we

Suggested (in addition to the external gamma aerial survey) that sampling of
soil, vegetation, ground water, cistern water, and marine species be included’

as part of the program.


Thus, the final survey plan incorporated a secondary

Select target paragraph3