Order number 940330-160606-96
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page 38
set 11 with 111 of 111 items
Islands. The authors exposed modified Panasgnic-802
thermoluminescent dosimeters (TLDs) in over?100 sites
for six months to accomplish this task. The sites were
selected to be either in areas of known high gamma dose
rates,

in areas where the Marshallese would likely spend

most of their time upon resettlement, or in areas where
experimental environmental changes has been made.
Therefore, the beta and gamma does rates do not
represent island averages. The mean beta dose rate on
Enue ranged from 23 mrem/yr at 1 cm to 6 mrem/yr at 100
cm, aS compared with a mean deep dose rate of 17.5
mrem/yr.

The mean beta dose rate around houses and in

general area on Bikini ranged from 425 mrem/yr at 1 cm
to 178 mrem/yr at 100 cm, compared with a deep dose rate
of about 154 mrem/yr. Because monitoring sites were
specifically placed in the most-contaminated areas of
Bikini and Eneu, the unshielded beta dose rates reported
provide an upper limit of radiation dose;actual doses
received by the Bikinians would be reduced significantly
by clothing, footwear, and ground cover such as crushed
coral, which reduces the beta dose rate by 80-90%. The
amount of time spent in houses and in the minimally
contaminated areas around houses and the lagoon would
further reduce the beta dose rates reported here. 17
referenced,

KEYWORDS

12

figures,

1 table.

BIKINI/radiation monitoring ;CESIUM 137/beta dosimetry ;

STRONTIUM 90/beta dosimetry
SURFACE CONTAMINATION

EDB Item
52
TITLE ENGLISH
PERSONAL AUTHOR
PUB. DATE (YYMMDD)

LIMITATION CODE
ABSTRACT

;BIKINI;PROGRESS REPORT;

Evolution of reef and atoll margin carbonates, upper
Eocene through lower Miocene, Enewetak, Marshall Islands
Saller, A.H.;Schlanger, S.O.
880000

UNL
Two wells drilled along the margin of Enewetak Atoll
penetrated approximately 1,000 m of upper eocene,
Oligocene,

and lower Miocene carbonates.

STrontium

isotope stratigraphy indicates relatively continuous
deposition of carbonate from 40 Ma to 20 Ma.
Depositional environments show a gradual basinward
progradation of facies with slope carbonates passing
upward into fore-reef,

carbonates.

reef,

back-reef,

and~-agoonal

Slope strata contain wackestones and

packstones with submarine-cemented lithoclasts, coral,
coralline algae fragments, benthic rotaline forams,

planktonic forams,

and echinoderm fragments.

Fore-reef

strata are dominantly packstones and boundstones

containing large pieces of coral,

9003412

abundant benthic

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