Abstract
137Cs and 241Pu (via 241Am) concentrations were measured γ-spectrometrically on air filters from the early 1960s (mainly from 1964–66) from Vienna, Austria, and an alpine station in Salzburg, Austria. Accelerator mass spectrometry (AMS) was used to determine 240Pu/239Pu, 236U/238U and 233U/236U atom ratios as well as 236U, 239Pu and 240Pu atom concentrations. The maximum 236U/238U atom ratio of these unique undisturbed global fallout samples was (1.19 ± 0.31) × 10−5 in spring 1964. The 233U/236U atom ratios were found within (0.15–0.49) × 10−2 and indicate that the weapons tests of the early 1960s can be excluded as 233U source. The 236U/239Pu atom ratios were calculated in the range of 0.22–0.48.
Original language | English |
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Article number | 107030 |
Number of pages | 8 |
Journal | Journal of Environmental Radioactivity |
Volume | 255 |
DOIs | |
Publication status | Published - Dec 2022 |
Austrian Fields of Science 2012
- 104023 Environmental chemistry
- 104020 Radiochemistry
- 103039 Aerosol physics
- 103037 Environmental physics
Keywords
- U/U
- Pu/Pu
- Air filters
- AMS
- Bomb peak