A soil sampling program is the most direct means of determining the types, concentration/activity, and distribution of radionuclides within and around nuclear facilities.
Los Alamos National Laboratory (LANL), for example, has had a soil surveillance program since the early 1970s and the purpose of this paper was to 1) evaluate this 20+year data set to determine if there are any statistical differences in radionuclides (3H, 137Cs, 238Pu, 239,240Pu, 241Am, 90Sr, totU) and radioactivity (gross alpha, bêta, and gamma), as a function of air emissions and fugitive dust, in surface soils (0-5 cm depth) collected from LANL, perimeter (PM) and background (BG) sites, and 2) determine if radionuclide concentrations are increasing or decreasing over time.
Also, the total effective dose equivalent (TEDE) and the corresponding risk of excess cancer fatalities (RECF) to a PM community were estimated.
Based on the long-term average, nine out of the ten radionuclide parameters measured in LANL soils (n=12) were significantly (p<0.05) higher in concentration than BG (n=6).
Perimeter soils (n=10), on the other hand, showed less differences with only four out of the ten parameters being statistically higher in concentration than BG.
Most radionuclides in LANL and PM areas, with the exception of 238Pu in soils from PM, significantly decrease in concentration over time, so that by 1996 most radionuclides were approaching values similar to BG.
The maximum net positive TEDE (...)
Mots-clés Pascal : Nouveau Mexique, Etats Unis, Amérique du Nord, Amérique, Pollution sol, Pollution radioactive, Radioisotope, Contrôle, Radioactivité, Teneur, Installation nucléaire, Echantillonnage, Variation temporelle, Variation spatiale, Dosimétrie, Homme
Mots-clés Pascal anglais : New Mexico, United States, North America, America, Soil pollution, Radioactive pollution, Radioisotope, Check, Radioactivity, Content, Nuclear installation, Sampling, Time variation, Spatial variation, Dosimetry, Human
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 98-0519975
Code Inist : 001D16D02. Création : 23/03/1999.