Document Type: Journal Article
Language: English
Journal Announcement: EDB8408
Country of Origin: Japan
Abstract: The determination of the /sup 240/Pu//sup 239/Pu isotopic ratio
in environmental samples has been attempted by the measurement of the
Lx/..cap alpha..-ray activity ratio using a Ge-LEPS (low-energy photon
spectrometer) and a surface-barrier
Si detector. By this method,
interesting data were obtained for various samples collected from
Thule, Greenland, Bikini Atoll and Nagasaki, as well as for some soils
collected from near and off-site locations of atomic power stations.;
Major Descriptors: *PLUTONIUM 239 -- ISOTOPE RATIO; *PLUTONIUM 240 -ISOTOPE RATIO; *SOILS -- SAMPLING; *SURFACE BARRIER DETECTORS -PERFORMANCE; *X-RAY SPECTROMETERS -- PERFORMANCE
Descriptors: ALPHA PARTICLES; BIKINI; GREENLAND; NAGASAKI; X RADIATION
Broader Terms: ACTINIDE ISOTOPES; ACTINIDE NUCLEI; ALPHA DECAY
RADIOISOTOPES; ASIA; CHARGED PARTICLES; ELECTROMAGNETIC RADIATION;
EVEN-EVEN NUCLEI; EVEN-ODD NUCLEI; HEAVY NUCLEI; IONIZING RADIATIONS;
ISLANDS; ISOTOPES; JAPAN; MARSHALL ISLANDS; MEASURING INSTRUMENTS;
MICRONESIA; NUCLEI; OCEANIA; PLUTONIUM ISOTOPES; RADIATION DETECTORS;
RADIATIONS; RADIOISOTOPES; SEMICONDUCTOR DETECTORS; SPECTROMETERS;
YEARS LIVING RADIOISOTOPES
Subject Categories: 440101*
-- Radiation Instrumentation -- General
Detectors or Monitors & Radiometric Instruments
510301
-- Environment, Terrestrial -- Radioactive Materials Monitoring
& Transport -- Soil -- (-1987)
10/5/667
01422428
Author(s):
{Item 367 from file: 103)
ERA-09-036291; EDB-84-120229
Hicks,
H.G.
Title: Results of calculations of external gamma radiation exposure rates
from local fallout and the related radionuclide compositions of
selected US Pacific events
Corporate Source:
Publication Date:
Report Number(s):
Order Number:
Lawrence Livermore National Lab.,
Feb 1984
UCRL-53505
CA
p 205
(USA)
DE84010678
Contract Number
(DOE):
W-7405-ENG-48
Note: Portions are illegible in microfiche products.
available until stock is exhausted
Original copy
Document Type: Report; Numerical data
Language: English
Journal Announcement:
INS8408
Availability: NTIS, PC A1l0/MF AOl;
Subfile:
INS
Abstracts).
(US
Atomindex
1.
input);
NTS
(NTIS);
BRA
(Energy Research
Country of Origin: United States
Country of Publication: United States
Abstract: This report presents data on calculated gamma radiation exposure
rates and local surface deposition of related radionuclides resulting
from selected US Pacific events. Results of the calculations of
relative external gamma radiation exposure rate and related
radionuclide ground deposition are given in six appendices. The output
of the calculation has 30 decay times: 10 from 1 to 21h, 10 from i to
300 d, and 10 from 1 to 50 y. For each of these times and for zero
time, there are values of the external gamma radiation exposure rate
cD
cD
normalized to 1 mR/h, 1m above the surface, 12 h after the event; the cry
associated values of ..mu..Ci/m/sup 2/ for each radionuclide; and the
total ..mu..Ci/m/sup 2/. Surface roughness effects are simulated by
—
using Beck’s values of (mR/h)/..mu..Ci/m/sup 2/) for a relaxation
length of 0.16 g/cm/sup 2/. Fractionation effects, simulated by the
removal of a fraction of the refractory nuclides from the calculation,
were found for unfractionated debris and for debris with 0.5 and 0.1 of
the refractory elements present. Each Appendix contains three sets of
ll pages of calculated results relating to one event in Table 1. Each
set of 11 pages is marked page 2 through page 12. Page 2 of each set