Lachner Johannes, Christl Marcus, Bisinger Tanja, Michel Rolf, Synal Hans-Arno
Laboratory of Ion Beam Physics, ETH Zürich, 8093 Zürich, Switzerland.
Appl Radiat Isot. 2010 Jun;68(6):979-83. doi: 10.1016/j.apradiso.2010.01.043. Epub 2010 Feb 4.
Atom ratios of the isotopes (239)Pu, (240)Pu, (241)Pu and (244)Pu were determined in sediments and soils from Bikini atoll using low energy Accelerator Mass Spectrometry. All samples had been contaminated by local fallout from nuclear weapon testing between 1946 and 1958 and show significant variations in the isotopic composition, which are ascribed to the different yields of single tests and to the mixture of material from various devices. Differences in the (244)Pu/(239)Pu ratio (2.8-5.7x10(-4)) are more pronounced than in the (240)Pu/(239)Pu ratio of the same samples and provide complementary information to distinguish the sources of contamination.
利用低能加速器质谱法测定了比基尼环礁沉积物和土壤中同位素钚-239、钚-240、钚-241和钚-244的原子比。所有样品均受到1946年至1958年期间核武器试验产生的当地放射性沉降物的污染，其同位素组成存在显著差异，这归因于单次试验的不同产率以及来自各种装置的物质混合。钚-244/钚-239比率（2.8 - 5.7×10⁻⁴）的差异比同一样品中钚-240/钚-239比率的差异更为明显，为区分污染来源提供了补充信息。
