A series of 254 weapons design experiments was conducted by Los Alamos National Laboratory from 1944 through 1962 and resulted in the dispersal of approximately 11 PBq (300 kCi) of radioactive 140La.
All shots occurred at Point Able in Bayo Canyon, east of the Los Alamos townsite.
Public interest and the Government Accounting Office probe precipitated a dose reconstruction to assess potential exposures to members of the public.
The information available for each shot included explosive charge size, date and time of explosion, and shot activity.
Detailed meteorological data were not available for the majority of the shots, requiring the development of statistically representative meteorological data.
A wind rose was developed specific to the afternoon-evening time of the shots, and the wind frequency in each sector was used to determine the fraction of activity dispersed towards each hypothetical receptor.
HOTSPOT 7, a Gaussian plume-based dispersion model, was used to determine the average dose per sector per unit of shot activity.
The dose from penetrating radiation from ground-deposited 140La was greater by several orders of magnitude than the dose from inhalation and immersion.
The highest doses to a permanent resident probably occurred in the easternmost part of the Los Alamos townsite.
The highest annual dose occurred in 1955 and was approximately 0.23 mSv. (...)
Mots-clés Pascal : Armement nucléaire, Expérimentation, Lanthane, Impact environnement, Distribution dose, Analyse risque, Radiocontamination, Modélisation, Dosimétrie, Dispersion atmosphérique, Répartition géographique
Mots-clés Pascal anglais : Nuclear weapon, Experimentation, Lanthanum, Environment impact, Dose repartition, Risk analysis, Radioactive contamination, Modeling, Dosimetry, Atmospheric dispersion, Geographic distribution
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 97-0506360
Code Inist : 002A08F03. Création : 13/02/1998.