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222Rn and 210Pb in ...
222Rn and 210Pb in the Arctic summer air
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- Samuelsson, Christer (författare)
- Lund University,Lunds universitet
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- Hallstadius, Lars (författare)
- Lund University
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- Persson, Bertil (författare)
- Lund University,Lunds universitet
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- Hedvall, Robert (författare)
- Lund University,Lunds universitet
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- Holm, Elis (författare)
- Lund University,Lunds universitet
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- Forkman, Bengt (författare)
- Lund University,Lunds universitet
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(creator_code:org_t)
- 1986
- 1986
- Engelska 20 s.
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Ingår i: Journal of Environmental Radioactivity. - 0265-931X. ; 3:1, s. 35-54
- Relaterad länk:
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http://dx.doi.org/10...
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- As part of an extensive air chemistry programme, during summer 1980, on board the Swedish ice-breaker 'Ymer', levels of 222Rn (radon) and its long-lived daughters 210Pb and 210Po were measured. The radon was trapped on charcoal and the long-lived daugther products sampled on filters on a daily basis. In addition, short-lived progenies were followed continuously on the filters in order to achieve a time resolution of about one hour. The concentrations of radon and 210Pb in the Arctic summer air north of latitude 75° N averaged 75 ± 21 (1 sd) and 0·075 ± 0·028 mBqm-3, r respectively. During a two week period of persistent polar winds, the mean radon concentration was 19 ±5 mBq m-3. During such 'Arctic background' conditions, radon exhalation from the sea may contribute significantly to the measured radon-in-air concentration. It is shown that steady-state equilibrium models, applied to an air mass over the sea, overstimate the aerosol residence-time calculated from activity ratios. Time-dependent calculations indicate a mean aerosol residence time of 4 to 7 d in Arctic air. Good agreement is observed between radon levels and the time since the air mass left larger areas. Both the 222Rn and the long-lived daughter measurements are insensitive to contamination from ship and local settlement.
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- ref (ämneskategori)
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