Asta Gregoric - Academia.edu (original) (raw)

Papers by Asta Gregoric

Journal of environmental radioactivity, 2008

Vertical profiles of radioactive radon gas ((222)Rn) and dissolved gaseous mercury (DGM) in seawa... more Vertical profiles of radioactive radon gas ((222)Rn) and dissolved gaseous mercury (DGM) in seawater in the Mediterranean Basin have been measured. They were found in the range 1.7-19.3 Bq m(-3) and 22-200 ng m(-3), respectively, at the bottom and 2.0-20.0 Bq m(-3) and 6-80 ng m(-3), respectively, at the surface. Preliminary results indicate a positive correlation between concentrations of both gases at some locations, but not at others. Further analyses will be performed, after (226)Ra contents in sediment and water have been determined, taking into account environmental parameters such as air and water temperatures, barometric pressure and water flow, in order to better interpret these profiles.

Journal of Radioanalytical and Nuclear Chemistry, 2015

Your article is protected by copyright and all rights are held exclusively by Akadémiai Kiadó, Bu... more Your article is protected by copyright and all rights are held exclusively by Akadémiai Kiadó, Budapest, Hungary. This e-offprint is for personal use only and shall not be selfarchived in electronic repositories. If you wish to self-archive your article, please use the accepted manuscript version for posting on your own website. You may further deposit the accepted manuscript version in any repository, provided it is only made publicly available 12 months after official publication or later and provided acknowledgement is given to the original source of publication and a link is inserted to the published article on Springer's website. The link must be accompanied by the following text: "The final publication is available at link.springer.com".

Collegium antropologicum, 2008

respectively. At both locations several anomalies in radon concentration were observed, that migh... more respectively. At both locations several anomalies in radon concentration were observed, that might have been caused by seismic events. In this study all earthquakes with ratio (D/R) between strain radius (D) and distance to the epicenter (R) greater than 0.5 were taken into account. Five earthquakes occurred in the vicinity of Bled in this period, the strongest at a distance of 17 km with the magnitude M L =3.8 and four radon anomalies were observed. At Hotavlje fourteen earthquakes occurred in the vicinity with D/R ratio from 0.5 to 2.9. During this period three radon anomalies were observed.

Uranium - Past and Future Challenges, 2014

Journal of Environmental Radioactivity, 2013

Soil samples, from 70 points uniformly distributed over entire Slovenia, were analysed for 40 K, ... more Soil samples, from 70 points uniformly distributed over entire Slovenia, were analysed for 40 K, 232 Th and 226 Ra using gamma spectrometry, and for 234 U and 238 U using alpha spectrometry. The following ranges and averages of activity concentrations (Bq kg À1 ) were obtained: 98e2600 and 800 AE 520 for 40 K, 9e170 and 77 AE 33 for 232 Th, 12e270 and 63 AE 44 for 226 Ra, 12e84 and 34 AE 19 for 234 U, and 11e90 and 34 AE 19 for 238 U. With respect to lithology, the highest average values for 40 K and 232 Th were found at clastic sediments containing clay and for 226 Ra on carbonate rocks. Based on the measured activity concentrations, terrestrial gamma dose rates were calculated. The total dose rate ranged from 15 to 260 nGy h À1 , with arithmetic mean of 110 AE 49 nGy h À1 , being the highest over carbonates.

International Journal of Climatology, 2014

ABSTRACT Radon concentration and cave temperature were studied at two morphologically different l... more ABSTRACT Radon concentration and cave temperature were studied at two morphologically different locations (the Beautiful Caves—BC and the lowest point—LP) in Postojna Cave (Slovenia). Radon concentration was considered a trace gas for cave ventilation research, where cave temperature was used as a supported microclimatic parameter. The influence of several climatic factors on radon concentration was studied, from which outside air temperature was found to have the highest control over cave ventilation. Measured radon concentration during 1-year period was in the range from 740 to 4000 Bq m−3 at LP, whereas during 2-year period at BC radon concentration experienced two different annual cycles. The change was observed after flood in September 2010. Radon concentration was in the range from 500 to 9000 Bq m−3 in the year 2010 and 500 to 5500 Bq m−3 in the year 2011 and 2012. Temperature was in the range from 9.9 to 10.5 °C and 9.8 to 10.7 °C at BC and BC-1 (the main passage connected to the LP), respectively. Two different ventilation regimes can be distinguished for LP location and for year 2010 at BC, whereas after flood, three ventilation regimes are characteristic for BC location. Significant change of radon emissions was observed after flood.

Journal of environmental radioactivity, 2008

Vertical profiles of radioactive radon gas ((222)Rn) and dissolved gaseous mercury (DGM) in seawa... more Vertical profiles of radioactive radon gas ((222)Rn) and dissolved gaseous mercury (DGM) in seawater in the Mediterranean Basin have been measured. They were found in the range 1.7-19.3 Bq m(-3) and 22-200 ng m(-3), respectively, at the bottom and 2.0-20.0 Bq m(-3) and 6-80 ng m(-3), respectively, at the surface. Preliminary results indicate a positive correlation between concentrations of both gases at some locations, but not at others. Further analyses will be performed, after (226)Ra contents in sediment and water have been determined, taking into account environmental parameters such as air and water temperatures, barometric pressure and water flow, in order to better interpret these profiles.

Journal of Radioanalytical and Nuclear Chemistry, 2015

Your article is protected by copyright and all rights are held exclusively by Akadémiai Kiadó, Bu... more Your article is protected by copyright and all rights are held exclusively by Akadémiai Kiadó, Budapest, Hungary. This e-offprint is for personal use only and shall not be selfarchived in electronic repositories. If you wish to self-archive your article, please use the accepted manuscript version for posting on your own website. You may further deposit the accepted manuscript version in any repository, provided it is only made publicly available 12 months after official publication or later and provided acknowledgement is given to the original source of publication and a link is inserted to the published article on Springer's website. The link must be accompanied by the following text: "The final publication is available at link.springer.com".

Collegium antropologicum, 2008

respectively. At both locations several anomalies in radon concentration were observed, that migh... more respectively. At both locations several anomalies in radon concentration were observed, that might have been caused by seismic events. In this study all earthquakes with ratio (D/R) between strain radius (D) and distance to the epicenter (R) greater than 0.5 were taken into account. Five earthquakes occurred in the vicinity of Bled in this period, the strongest at a distance of 17 km with the magnitude M L =3.8 and four radon anomalies were observed. At Hotavlje fourteen earthquakes occurred in the vicinity with D/R ratio from 0.5 to 2.9. During this period three radon anomalies were observed.

Uranium - Past and Future Challenges, 2014

Journal of Environmental Radioactivity, 2013

Soil samples, from 70 points uniformly distributed over entire Slovenia, were analysed for 40 K, ... more Soil samples, from 70 points uniformly distributed over entire Slovenia, were analysed for 40 K, 232 Th and 226 Ra using gamma spectrometry, and for 234 U and 238 U using alpha spectrometry. The following ranges and averages of activity concentrations (Bq kg À1 ) were obtained: 98e2600 and 800 AE 520 for 40 K, 9e170 and 77 AE 33 for 232 Th, 12e270 and 63 AE 44 for 226 Ra, 12e84 and 34 AE 19 for 234 U, and 11e90 and 34 AE 19 for 238 U. With respect to lithology, the highest average values for 40 K and 232 Th were found at clastic sediments containing clay and for 226 Ra on carbonate rocks. Based on the measured activity concentrations, terrestrial gamma dose rates were calculated. The total dose rate ranged from 15 to 260 nGy h À1 , with arithmetic mean of 110 AE 49 nGy h À1 , being the highest over carbonates.

International Journal of Climatology, 2014

ABSTRACT Radon concentration and cave temperature were studied at two morphologically different l... more ABSTRACT Radon concentration and cave temperature were studied at two morphologically different locations (the Beautiful Caves—BC and the lowest point—LP) in Postojna Cave (Slovenia). Radon concentration was considered a trace gas for cave ventilation research, where cave temperature was used as a supported microclimatic parameter. The influence of several climatic factors on radon concentration was studied, from which outside air temperature was found to have the highest control over cave ventilation. Measured radon concentration during 1-year period was in the range from 740 to 4000 Bq m−3 at LP, whereas during 2-year period at BC radon concentration experienced two different annual cycles. The change was observed after flood in September 2010. Radon concentration was in the range from 500 to 9000 Bq m−3 in the year 2010 and 500 to 5500 Bq m−3 in the year 2011 and 2012. Temperature was in the range from 9.9 to 10.5 °C and 9.8 to 10.7 °C at BC and BC-1 (the main passage connected to the LP), respectively. Two different ventilation regimes can be distinguished for LP location and for year 2010 at BC, whereas after flood, three ventilation regimes are characteristic for BC location. Significant change of radon emissions was observed after flood.