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| Titel |
Short-term Rn-222 concentration changes in underground spaces with limited air exchange |
| VerfasserIn |
Lidia Fijałkowska-Lichwa, Tadeusz A. Przylibski |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250036652
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| Zusammenfassung |
| Authors conducted research on radon concentration in two underground structures located in
the vicinity of Kletno (Sudety Mts., SW Poland), which are accessible for visitors. One of
these structures is Niedźwiedzia (Bear) Cave, and the second one is the part of former
uranium mine – Fluorite Adit. Both selected underground structures are characterized by
almost constant temperature, changing within the range from +5 to +7Ë C and also constant
relative humidity, close to 100%. Both these parameters testify that air exchange with the
atmosphere is very limited. Air exchange is limited particularly in Niedźwiedzia
Cave, which microclimate is protected i.e. by applying of locks at the entrance
and exit of tourist route. The measurements were conducted between 16.05.2008.
and 15.11.2009., by the use of a new Polish equipment – SRDN-3 devices with
semiconductor detector. SRDN-3 device records every hour radon concentration as well
as atmospheric parameters - relative humidity and temperature. At the same time
authors conducted measurements of basic parameters in the open atmosphere close to
Niedźwiedzia Cave. Obtained results of atmospheric parameters measurements
may be used for both underground structures; because they are located within the
distance of about 1Â km. Atmospheric parameters were measured by the use of
automatic weather station VantagePro2. On the base of conducted research authors
corroborate, that the differences of radon concentration in both underground structures
reach three orders of magnitude during a year. In Niedźwiedzia Cave these values
are in the range from below 88 Bq/m3 (detection limit of the SRDN-3 device) up
to 12 kBq/m3. Related values in Fluorite Adit are between < 88 Bq/m3 and 35
kBq/m3. It was observed also the different course of daily radon concentration
changes in both structures. Additionally, authors registered that daily course of radon
concentration changes differs due to season of the year. Such changes are observed in both
structures. The reasons of these changes are probably connected with the way of air
exchange between interior of the structure and the atmosphere. In both cases they are
determined by atmospheric air temperature changes in relation with the temperature of
the air inside the cave or adit. Authors have been still working on this problem.
We can also say, that the character of daily radon concentration changes inside
both examined structures differ from typical changes noted in dwelling houses. |
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