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J Environ Radioact. 2016 Aug;160:80-6. doi: 10.1016/j.jenvrad.2016.04.025. Epub 2016 May 4.

Temporal variability of beryllium-7 fallout in southwest UK.

Author information

1
Plymouth University, School of Geography, Earth and Environmental Sciences, Plymouth, PL4 8AA, UK. Electronic address: alex.tayor@plymouth.ac.uk.
2
Plymouth University, School of Geography, Earth and Environmental Sciences, Plymouth, PL4 8AA, UK; Kemakta Konsult, Stockholm, Sweden.
3
Plymouth University, School of Geography, Earth and Environmental Sciences, Plymouth, PL4 8AA, UK.
4
Soil and Water Management and Crop Nutrition Laboratory, FAO/IAEA Agriculture & Biotechnology Laboratory, IAEA Laboratories Seibersdorf, Austria.

Abstract

Cosmogenic beryllium-7 has been widely employed as a sediment tracing tool and continued development of its use as a soil erosion tracer requires knowledge of fallout temporal dynamics. Data regarding beryllium-7 fallout in the UK are scarce and here the authors provide a record of beryllium-7 fallout in southwest England spanning a two-year period. A monthly fallout record was developed for Plymouth, UK using regular rainfall sampling to determine beryllium-7 rainfall activity concentration (Bq L(-1)) and deposition flux (Bq m(-2)). Data showed a general tendency for higher activity during the spring/summer months and lower activity in the autumn/winter months. Comparison with data for other UK sites (Chilton and Aberporth) for the same period found significant differences in (7)Be activity in rainwater and lower variability in Plymouth than Chilton and Aberporth. Total deposition was largely controlled by rainfall in Plymouth although regression coefficients suggested greater importance of other atmospheric controls at the Chilton and Aberporth sites. Use of a deposition proportion to rainfall proportion ratio identified periods when deposition was influenced by varying (7)Be activity in rainfall. Broad ranges in ratios were found for Chilton and Aberporth and this has implications for sediment tracer studies requiring estimates of (7)Be deposition flux across months or seasons.

KEYWORDS:

Beryllium-7; Deposition; Fallout; Rainfall

PMID:
27155526
DOI:
10.1016/j.jenvrad.2016.04.025
[Indexed for MEDLINE]

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