 |
| Titel |
Short-term ²²²Rn activity concentration changes in underground spaces with limited air exchange with the atmosphere |
| VerfasserIn |
L. Fijałkowska-Lichwa, T. A. Przylibski |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1561-8633
|
| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 11, no. 4 ; Nr. 11, no. 4 (2011-04-27), S.1179-1188 |
| Datensatznummer |
250009349
|
| Publikation (Nr.) |
 copernicus.org/nhess-11-1179-2011.pdf |
|
|
|
|
|
| Zusammenfassung |
The authors investigated short-time changes in 222Rn activity
concentration occurring yearly in two underground tourist facilities with
limited air exchange with the atmosphere. One of them is Niedźwiedzia (Bear)
Cave in Kletno, Poland – a natural space equipped with locks ensuring isolation
from the atmosphere. The other site is Fluorite Adit in Kletno, a section of
a disused uranium mine. This adit is equipped with a mechanical ventilation
system, operated periodically outside the opening times (at night). Both
sites are situated within the same metamorphic rock complex, at similar
altitudes, about 2 km apart.
The measurements conducted revealed spring and autumn occurrence of
convective air movements. In Bear Cave, this process causes a reduction in
222Rn activity concentration in the daytime, i.e. when tourists, guides and
other staff are present in the cave. From the point of view of radiation
protection, this is the best situation. For the rest of the year, daily
concentrations of 222Rn activity in the cave are very stable. In
Fluorite Adit, on the other hand, significant variations in daily 222Rn
activity concentrations are recorded almost all year round. These changes
are determined by the periods of activity and inactivity of mechanical
ventilation. Unfortunately this is inactive in the daytime, which results in the
highest values of 222Rn activity concentration at the times when
tourists and staff are present in the adit. Slightly lower concentrations of
radon in Fluorite Adit are recorded in the winter season, when convective
air movements carry a substantial amount of radon out into the atmosphere.
The incorrect usage of mechanical ventilation in Fluorite Adit results in
the most unfavourable conditions in terms of radiation protection. The staff
working in that facility are exposed practically throughout the year to the
highest 222Rn activity concentrations, both at work (in the adit) and at
home (outside their working hours). Therefore, not very well
considered solution for the ventilation system not only does not prevent radioactive
exposure of the staff, but can even increase it.
The authors have also observed comparable characteristics of the annual patterns of 222Rn activity concentration changes in underground spaces and
residential buildings situated in the same or similar climatic zones. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|