Naslov
RADON POTENTIAL OF THE KARSTIC LOCATIONS IN THE WESTERN PART OF THE NIKŠIĆ MUNICIPALITY (MONTENEGRO)

Autori
Vukotić, Perko ; Radolić, Vanja ; Svrkota, Ranko ; Stanić, Denis ; Anđelić, Tomislav ; Mrdak, Radivoje ; Fuštić, Budimir

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Zbornik sažetaka 13. Simpozija Hrvatskog društva za zaštitu od zračenja / Petrinec, Branko ; Pavelić, Luka ; Popić, Jelena ; Kopjar, Nevenka - Zagreb : Hrvatsko društvo za zaštitu od zračenja, 2023, 135-135

Skup
13. Simpozij Hrvatskog društva za zaštitu od zračenja

Mjesto i datum
Poreč, Hrvatska, 18.04.2023. - 21.04.2023

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Domaća recenzija

Ključne riječi
karst region ; high indoor radon levels ; high geogenic radon potential

Sažetak
Radon concentrations in Montenegrin dwellings and schools are the highest in the western, rural part of the Nikšić municipality, which is a typical high karst region. In this region, during the national radon surveys, radon was measured in ground-floor rooms of 9 houses and 16 schools, at 25 locations that belong to an area of 800 km2. The radon concentrations in them were found to be in the range (219 – 2494) Bq/m3, with a mean value AM = 977 Bq/m3. In order to investigate the geogenic radon potential of these 25 karstic locations, as a probable cause of the high indoor radon levels, the following soil parameters were measured in the immediate vicinity of the mentioned houses and schools: humidity (H), electrical conductivity (EC), pH, activity concentrations of 226Ra, 238U, 235U, 232Th and 40K, radon activity concentration (c), permeability (k) for radon gas, and gamma dose rate (D) in the air 1 m above the soil. The geogenic radon potential of the location (GRP) was calculated from c and k values. Quantities that characterize radon in soils of the investigated area are found to have high values: c – range (8.9 – 390) kBq/m3, AM = 115 kBq/m3 ; k – range (3.9 – 180) ∙ 10-13 m2, AM = 153 10-13 m2 ; GRP – range (11 – 419), AM = 129. Also, concentrations of 226Ra, as 222Rn parent, are elevated (range (48 – 326) Bq/kg, AM = 167 Bq/kg), probably because of traces of bauxite presence at some of the investigated locations. Nine of the 25 investigated locations have a radon index (RI) which is categorized as extremely high, and the other 9 locations have very high RI. Spearman correlation reveals a strong relationship between c and GRP (rs = 0.906, p < 0.001), moderate relationships of c with D (rs = 0.517, p < 0.008) and 226Ra (rs = 0.521, p < 0.008), and k with EC (rs = 0.614, p < 0.001). The relationship between D and 226Ra is strong (rs = 0.719, p < 0.001). Pearson correlation shows positive linear relationships of gamma dose rate (D) with 226Ra and radon concentration (c) in soil and with GRP of the location, which means that D could be used at karstic terrains as the first, although rough indicator of radium content in the soil, and geogenic radon potential at the location as well.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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