| Abstract | | Aim: In order to demonstrate the difference in dose conversion factors obtained based on epidemiological studies (DCFE) and by applying dosimetric models for mouth (DCFDm) and nasal (DCFDn) breathing the unattached fraction of nanosize radon short-lived decay products (fun) was measured. Methods: Portable SARAD EQF3020 and EQF3020-2 devices were used to continuously measureactivity levels of radon (Rn) and radon short-lived decay products (RnDP) , equilibrium factors between Rn and RnDP, and unattached fractions of RnDP. Measurements were carried out in kindergartens, karst caves and wineries. Conclusion: In kindergartens, fun ranged from 0.03 to 0.24 with a geometric mean of 0.14. DCFDm and DCFDn are higher by a factor of 4.0 and 1.7,respectively, than DCFE = 5 mSv WLM-1. At the lowest point of the PostojnaCave, fun values ranged from 0.54 to 0.68 in summer and from 0.12 to 0.14 in winter. DCFDm is higher than DCFE by a factor of 11.5-14.2 in summer and 3.6-4.0 in winter, while for DCFDn, these factors are 3.1-3.5 and 1.6-1.7,respectively. In wineries, fun values ranged from 0.08 to 0.20; DCFDm and DCFDn are higher than DCFE by factors of 2.8-5.1 and 1.5-1.9, respectively.
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| Summary | | Cilj: Meritve deleža prostih radonovih kratkoživih razpadnih produktov (fun) velikosti nanometrov z namenom, da bi prispevali k razlagi razlike med doznimipretvorbenimi faktorji (DCF), ki jih dobimo na podlagi epidemioloških izsledkov (DCFE) oziroma izračunamo po dozimetričnem modelu za dihanje skozi usta (DCFDm) in skozi nos (DCFDn). Metode: Za meritve smo uporabljali prenosna merilnika SARAD EQF3020 in EQF3020-2, s katerima smo kontinuirno merili koncentracije radona (Rn) in radonovih kratkoživih razpadnih produktov (RnDP), faktor radioaktivnega ravnotežja med Rn in RnDP (F) ter delež prostih RnDP (fun). Meritve smo izvedli v otroških vrtcih, kraških jamah in vinskih kleteh. Zaključki: V otroških vrtcih so bile vrednosti fun med 0,03 in 0,24 z geometrično srednjo vrednostjo 0,14. DCFDm in DCFDn sta bila za faktor 4,0 oziroma 1,7 večja od DCFE = 5 mSv WLM-1. V Postojnski jami je bil fun v območju 0,54-0,68 poleti in v območju 0,12-0,14 pozimi na najnižji točki v jami. DCFDm je za faktor 11,5-14,2 poleti in faktor 3,6-4,0 pozimi večji od DCFE, medtem ko sta ta faktorja 3,1-3,5 oziroma 1,6-1,7 za DCFDn. V vinskih kleteh so bile vrednosti fun v območju 0,08-0,20; DCFDm je bil za faktor 2,8-5,1, DCFDn pa za faktor 1,5-1,9 večji od DCFE.
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