(7)Be, (210)Pb, and (210)Po in the surface air from the Arctic to Antarctica.

• In the present study we have investigated the activity concentrations of (210)Pb, (210)Po as well as (7)Be in surface air of the North and South Atlantic (1988-1989), the Arctic Ocean (1991), and along the coastline of Siberia (1994) during succeeding expeditions in the Swedish Polar Research program. During the cruises in the Arctic Ocean during 1991-07-28 to 1991-10-04 the average airconcentrations of (7)Be was 0.6±0.4mBq/m(3), (210)Pb 40±4μBq/m(3) and (210)Po-38±10μBq/m(3). During the Swedish-Russian Tundra Ecology-94 expedition along the Siberian coastline the average air concentrations of (7)Be and (210)Pb measured during May-July were 11±3, and 2.4±0.4mBq/m(3), and during July-September they were 7.2±2 and 2.7±1.1mBq/m(3) respectively. The results from measurements of the activity concentration of (210)Pb in the air over the Arctic Ocean vary between 75 and 176μBq/m(3). Inthe air close to land masses, however, the activity concentration of (210)Pb in the air increases to 269-2712μBq/m(3). The activity concentration of (7)Be in the South Atlantic during the cruise down to Antarctica varied between 1.3 and 1.7 with an average of 1.5±0.8mBq/m(3). The activity concentration of (210)Pb in the South Atlantic down to Antarctica varied between 6 and 14μBq/m(3). At the Equator the activity concentration recorded in November 1988 was 630μBq/m(3) and in April 1989 it was 260μBq/m(3). The average activity concentration of (210)Pb during the route Gothenburg-Montevideo in 1988 was 290 and on the return Montevideo-Gothenburg it was 230μBq/m(3). The activity concentration of (210)Po in the South Atlantic down to Antarctica varied between 15 and 58μBq/m(3). At the Equator the activity concentration in November 1988 was 170 and in April 1989 it was 70μBq/m(3). The average activity concentration of (210)Po during the route Gothenburg-Montevideo in 1988 was 63 and on the return Montevideo-Gothenburg it was 60μBq/m(3). The average of the activity concentrations in the Antarctic air of (210)Pb was 27±10μBq/m(3) and of (210)Po it was 12±7μBq/m(3). All our results were compiled together with other published data, and the global latitudinal distribution of (210)Pb was converted to total annual deposition (Bq/m(2)/a) and fitted to a 4th degree polynomial. By using the global latitudinal distribution of (210)Po/(210)Pb-activity ratio from our own results the global latitudinal distribution of (210)Po annual deposition was derived.

Ämnesord

MEDICIN OCH HÄLSOVETENSKAP  -- Klinisk medicin -- Radiologi och bildbehandling (hsv//swe)

MEDICAL AND HEALTH SCIENCES  -- Clinical Medicine -- Radiology, Nuclear Medicine and Medical Imaging (hsv//eng)

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Miljövetenskap (hsv//swe)

NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Environmental Sciences (hsv//eng)

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