.mu..R/h were observed over parts
of Bikini Atoll,
including Bikini
Island, and over the northern part of Rongelap Atoll. Levels over
southern Rongelap and over Rongerik Atoll ranged from 4 to 7 .-mu..R/h.
Levels were somewhat lower at Ailinginae Atoll (approximately 2
..mu..R/h) and at Utirik Atoll (approximately 0.7 ..mu..R/h). The
variations observed were consistent with what might be expected from
the fallout pattern of the Bravo event. Levels at Ailuk, Likiep, Wotho
and Ujelang Atolls and at Mejit and Jemo Islands were consistent with
/sup 137/Cs activity, due to worldwide fallout, observed within the
United States and at other locations in the central Pacific. These four
atolls and the two islands, therefore, do not appear to have recieved
any significant direct contamination from the Bravo event or the other
tests conducted at Bikini and Enewetak Atolis.;
Major Descriptors: *MARSHALL ISLANDS -- DOSE RATES; *MARSHALL ISLANDS -RADIATION MONITORING
Descriptors: AERIAL MONITORING; CONTAMINATION; DATA COMPILATION; FALLOUT;
IMAGES; MAPS; NUCLEAR EXPLOSIONS
Broader Terms: DATA; EXPLOSIONS; INFORMATION; ISLANDS; MICRONESIA;
MONITORING; NUMERICAL DATA; OCEANIA
Subject Categories:
510302*
-- Environment,
Terrestrial -- Radioactive
Materials Monitoring & Transport -- Terrestrial Ecosystems & Food
Chains
--
(-1987)
INIS Subject Categories:
C22*
-- Radionuclide Ecology
10/5/738
(Item 438 from file: 103)
00884643
-NTS-82-003636; ERA-07-023144; INS-82-005132; EDB-82-059485
Author(s): Tipton, W.d.;
Fritzsche, A.E.;
Jaffe, R.J.;
Villaire, A.E.
Title:
In situ determination of /sup 241/Am on Enewetak Atoll.
survey:
July 1977-December 1979
Corporate Source:
EG and G, Inc., Las Vegas,
Measurements Group
NV
Date of
(USA). Energy
Publication Date: Nov 1981
p 25
Report Number(s):
EGG-1183-1778
Order Number: DE8&2007368
Contract Number
(DOE):
AC08-76NV01183
Document Type: Report; Numerical data
Language: English
Journal Announcement: EDB8201
Availability: NTIS, PC A02/MF AOl.
Subfile:
INS
{Technical
(US Atomindex input);
Information Center).
ERA
(Energy Research Abstracts);
TIC
Country of Origin: United States
Country of Publication: United States
Abstract: An in situ gamma ray spectrometer system was operated at Enewetak
Atoll from July 1977 to December 1979 in support of the Enewetak
Cleanup Project. The system employed a high purity germanium planar
detector suspended at a height of 7.4 m above ground. Conversion
factors were established to relate measured photopeak count rate data
to source concentration in the soil. Data obtained for /sup 241/Am,
together with plutonium-to-americium ratios obtained from soil sample
analyses, were used to establish area-averaged surface (0 to 3 cm)
transuranic concentration values. In areas which exceeded cleanup
measurements were made
in an iterative fashion to guide soil
removal until levels were reduced below the cleanup criteria. Final
measurements made after soil removal had been completed were used to
document remaining surface transuranic concentration values and to
establish external exposure rate levels due to /sup 137/Cs and /sup
60/Co.;
Major Descriptors: *XAMERICIUM 241 -- RADIATION MONITORING;
DECONTAMINATION; *SOILS -- RADIOACTIVITY
*ENIWETOK
--
Descriptors: CESIUM 137; COBALT 60; DOSE RATES; EXPERIMENTAL DATA; GAMMA
SPECTROMETERS; TABLES
Broader Terms: ACTINIDE ISOTOPES; ACTINIDE NUCLEI; ALKALI METAL ISOTOPES;
ALPHA DECAY RADIOISOTOPES; AMERICIUM ISOTOPES; BETA DECAY RADIOISOTOPES
; BETA-MINUS DECAY RADIOISOTOPES; CESIUM ISOTOPES; CLEANING; COBALT
ISOTOPES; DATA; HEAVY NUCLEI; INFORMATION; INTERMEDIATE MASS NUCLEI;
9003921
criteria,