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首页> 美国政府科技报告 >Radionuclides, Heavy Metals, and Polychlorinate Biphenyls in Soils Collected Around the Perimeter of Low-Level Radioactive Waste Disposal Area G during 2006
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Radionuclides, Heavy Metals, and Polychlorinate Biphenyls in Soils Collected Around the Perimeter of Low-Level Radioactive Waste Disposal Area G during 2006

机译：2006年低放射性废物处置区G周围聚集的土壤中的放射性核素，重金属和多氯联苯

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Twenty-one soil surface samples were collected in March around the perimeter of Area G, the primary disposal facility for low-level radioactive solid waste at Los Alamos National Laboratory (LANL). Three more samples were collected in October around the northwest corner after elevated tritium levels were detected on an AIRNET station located north of pit 38 in May. Also, four soil samples were collected along a transect at various distances (48, 154, 244, and 282 m) from Area G, starting from the northeast corner and extending to the Pueblo de San Ildefonso fence line in a northeasterly direction (this is the main wind direction). Most samples were analyzed for radionuclides (3H, 238Pu, 239, 240Pu, 241Am, 234U, 235U, and 238U), inorganic elements (Al, Ba, Be, Ca, Cr, Co, Cu, Fe, Mg, Mn, Ni, K, Na, V, Hg, Zn, Sb, As, Cd, Pb, Se, Ag, and Tl) and polychlorinated biphenyl (PCB) concentrations. As in previous years, the highest levels of 3H in soils (690 pCi/mL) were detected along the south portion of Area G near the 3H shafts; whereas, the highest concentrations of 241Am (1.2 pCi/g dry) and the Pu isotopes (1.9 pCi/g dry for 238Pu and 5 pCi/g dry for 239,240Pu) were detected along the northeastern portions near the transuranic waste pads. Concentrations of 3H in three soil samples and 241Am and Pu isotopes in one soil sample collected around the northwest corner in October increased over concentrations found in soils collected at the same locations earlier in the year. Almost all of the heavy metals, with the exception of Zn and Sb in one sample each, in soils around the perimeter of Area G were below regional statistical reference levels (mean plus three standard deviations) (RSRLs). Similarly, only one soil sample collected on the west side contained PCB concentrations 67 ig/kg dry of aroclor-1254 and 94 ig/kg dry of aroclor-1260. Radionuclide and inorganic element concentrations in soils collected along a transect from Area G to the Pueblo de San Ildefonso fence line show that most contained concentrations of 241Am, 238Pu, and 239,240Pu above the RSRLs. Overall, all concentrations of radionuclides, heavy metals, and PCBs that were detected above background levels in soils collected around the perimeter of Area G and towards the Pueblo de San Ildefonso boundary were still very low and far below LANL screening levels and regulatory standards.

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