Beryllium-7 atmospheric deposition and sediment inventories in the Neponset River estuary, Massachusetts, USA

Short-term seasonal variability in 7Be wet deposition in a semiarid ecosystem of central Argentina

“…For each rain event, a 400 ml subsample was measured from the total rainwater that was collected; and 2) the counting rate of our ultralow environmental background detector is only approximately 20 counts keV À1 d À1 at the region of interest (477 keV). Both characteristics combined make the present activity measurements a particular case in comparison with previous experiments in which either rainwater samples were chemically treated or detectors did not have such high sensitivity (Caillet et al, 2001;Ioannidou and Papastefanou, 2006;Wallbrink and Murray, 1994;Zhu and Olsen, 2009). …”

“…Recently, 7 Be atmospheric depositional fluxes were determined for a seven-year period in Boston, Massachusetts (Zhu and Olsen, 2009), measuring 7 Be in monthly precipitation samples from September 2000 to August 2007. The monthly 7 Be atmospheric deposition flux ranged from 1 to 670 Bq m À2 , with an average of 216 Bq m À2 .…”

Seasonal and inter-annual variation of Beryllium-7 deposition in birch-tree leaves and grass in the northeast upland area of the Czech Republic

“…Al-Azmi et al, 2001;Azahra et al, 2003;Ioannidou et al, 2005;Papastefanou and Ioannidou, 2004;Taplos et al, 2005;Zhu and Olsen, 2009). However, the annual 7 Be activities in birch-tree leaves in the respective years were significantly lower (P < 0.05) compared to the activities in grass (Table 2) and significantly higher (P < 0.01) than the average values of 7 Be in soils.…”

“…The 7 Be deposition, the 7 Be content in air (atmosphere) near the ground and the content as related to the scavenging mechanism and to removal processes were studied by many authors (e.g. Azahra et al, 2003;Buraeva et al, 2007;Doering and Akber, 2008;Hasegawa et al, 2007;Karunakara et al, 2003;Momoshima et al, 2006;Zhu and Olsen, 2009). They suggested that the seasonal variation of the 7 Be volume activity exhibiting a springesummer maximum and an autumnewinter minimum may be significantly dependent on the precipitation mode.…”

“…a springesummer maximum and an autumnewinter minimum. Zhu and Olsen (2009) measured the monthly 7 Be atmospheric fluxes in USA (Boston, Massachusetts) between September 2000 and August 2007 which exhibited seasonality and correlated with precipitation and solar activity. These fluxes resulted in the 7 Be sediment inventories in the Neponset River estuary ranging from 48 to 546 mBq cm À2 .…”