Prirodni radionuklidi u mahovinama iz istočne Srbije u razdoblju 2008.-2013.

Abstract

The results of the study on natural radionuclide content in 102 samples of the moss species randomly collected in 2008-2013 at 30 locations of eastern Serbia are presented in the paper. The activity concentration values of 238U, 226Ra, 232Th, 40K, and 7Be determined by gamma spectrometry were within the intervals: 238U (1.1–50) Bq kg-1, 226Ra (1.1–41) Bq kg-1, 232Th (1.4–28) Bq kg-1, 40K (64–484) Bq kg-1 and 7Be (88–227) Bq kg-1, not standing out of the average data reported for this region. The distribution of the obtained data for 226Ra, 232Th, and 238U activity concentration in the analysed mosses has shown values up to 10 Bq kg-1 with frequencies 47.1 %, 54.9 % and 48.0 %, respectively. The obtained activity concentration values of primordial 40K and cosmogenic radionuclide 7Be were up to 500 Bq kg-1 and about 90 % of all the results for 7Be uptake by mosses were in the 200-250 Bq kg-1 concentration range.U radu su prikazani rezultati ispitivanja sadržaja prirodnih radionuklida u 102 uzorka mahovine prikupljene metodom slučajnoga uzorka u razdoblju 2008.-2013. na 30 lokacija u istočnoj Srbiji. Vrijednosti koncentracija (specifične aktivnosti) radionuklida 238U, 226Ra, 232Th, 40K i 7Be, određene primjenom spektrometrije gama zračenja, nalaze se u opsegu: 238U (1,1 – 50) Bq kg-1, 226Ra (1,1 – 41) Bq kg-1, 232Th (1,4 – 28) Bq kg-1, 40K (64 – 484) Bq kg-1 i 7Be (88 – 227) Bq kg-1 te ne odstupaju značajno u odnosu na ostale rezultate dobivene za ovu regiju. Distribucija dobivenih podataka o koncentracijama 238U, 226Ra i 232Th u analiziranoj mahovini pokazuje vrijednosti do 10 Bq kg-1, s učestalošću 54,9 %, 48,0 % i 47,1 %. Dobivene vrijednosti koncentracija primordijalnoga 40K i kozmogenoga 7Be bile su do 500 Bq kg-1, pri čemu je oko 90 % svih rezultata za 7Be akumuliranog u mahovinama bilo u opsegu koncentracija 200 – 250 Bq kg-1