Vipavska dolina je geomorfolosko dokaj zaprta, kar po eni strani omogoca pojav mocne burje, po drugi strani pa ob stabilnih meteoroloskih razmererah ugodne pogoje za kopicenje aerosolov znotraj prizemne mejne plasti. Poznavanje dinamike visinske porazdelitve aerosolov s socasno uporabo prizemnih meritev omogoca raziskave lokalnih emisij aerosolov, transporta aerosolov na daljse razdalje ter znacilnih atmosferskih struktur, ki se pojavijo v razlicnih vremenskih pogojih. Pri meritvah smo uporabili metode daljinskega zaznavanja z lidarjem, ki omogocajo opazovanje casovnega in prostorskega spreminjanja koncentracij aerosolov, ter tockovne meritve, ki omogocajo njihovo prepoznavanje in dolocanje njihovih lastnosti. Ugotovili smo, da je mogoce lidarske meritve uporabiti za studij vrste atmosferskih procesov in struktur v zelo razlicnih vremenskih pogojih. Opazili smo manjse konvekcijske strukture znotraj prizemne mejne plasti in gravitacijske valove nad njo. Meritve vsebnosti in lastnosti aerosolov pri tleh kazejo, da se lahko ob stabilnih atmosferskih pogojih v primerih povecanja lokalnih emisij njihove koncentracije hitro povecajo. Dinamiko in strukturo razsirjanja aerosolov znotraj Vipavske doline bomo v prihodnje podrobneje raziskali s socasnim prostorskim pregledovanjem z metodami daljinskega zaznavanja.
A review is given on the radon survey in the Slovenian karst caves, those open for tourists and those for cavers and speleologists only. Radon concentrations differed markedly from cave to cave, as well as from point to point in the same cave. In addition to radon, in the Postojna Cave also radon decay products (RnDP), equilibrium factor between radon and RnDP, and the unattached fraction of RnDP have been monitored. Based on highradon levels, permanent radon monitoring was introduced in Postojna Cave and time spent by workers in the cave limited in order to keep their exposure to radon acceptably low.
76 instantaneous indoor radon concentrations above the Slovenian action level of 400 Bqm-3 were selected from the database of 1600 radon concentrations in kindergartens and schools, assembled during the Slovenian National Radon Programme. A relationship was found between indoor radon concentrations, and geology of rocks under the foundations (uranium content, permeability, porosity, tectonic fractures) and the quality of building construction.
The radon ((222)Rn) activity concentration in 15 dwellings in the Planej village and 10 dwellings in the Gorozhup village has been measured with the aim to complement the national radon survey and to compare the results of two different measurement techniques. The radon concentration has been measured in winter and spring using alpha scintillation cells and in winter, spring and summer by exposing solid-state nuclear track detectors. Both methods gave similar results. Radon concentrations in both villages were similar, ranging from 82 to 432 Bq m(-3); the value of 400 Bq m(-3) was exceeded only in two dwellings. The resulting annual effective doses ranged from 1.78 to 6.40 mSv, with the average values of 3.28 mSv in the Planej village and 3.87 mSv in the Gorozhup village.
In Niška Banja, a spa town in a radon-prone area in southern Serbia, radon (222Rn) and thoron (220Rn) activity concentrations were measured continuously for one day in indoor air of 10 dwellings with a SARAD RTM 2010-2 Radon/Thoron Monitor, and equilibrium factor between radon and its decay products and the fraction of unattached radon decay products with a SARAD EQF 3020-2 Equilibrium Factor Monitor. Radon concentration in winter time ranged from 26 to 73 100 Bq m−3 and that of thoron, from 10 to 8650 Bq m−3. In the same period, equilibrium factor and the unattached fraction varied in the range of 0.08 to 0.90 and 0.01 to 0.27, respectively. One-day effective doses were calculated and were in winter conditions from 4 to 2599 μSv d−1 for radon and from 0.2 to 73 μSv d−1 for thoron.
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