Merjenje koncentracij radona v prostorih in ocena izpostavljenosti na delovnih mestih

Čevka, Manca (author), Novosel, Barbara (mentor), Kolar, Mitja (comentor)

Radon je naravni radioaktivni plin, ki lahko zaradi kopičenja v zaprtih prostorih predstavlja pomemben dejavnik tveganja za zdravje zaposlenih. Namen magistrskega dela je bil določiti koncentracije radona v izbranih kletnih prostorih Fakultete za kemijo in kemijsko tehnologijo Univerze v Ljubljani, analizirati njihovo časovno in prostorsko spreminjanje ter oceniti izpostavljenost zaposlenih radonu na izbranih delovnih mestih. Meritve so bile izvedene v zimskem in poletnem merilnem obdobju z uporabo aktivnih merilnikov radona in pasivnih detektorjev za sledi CR-39. Pasivne meritve so bile izvedene na desetih merilnih mestih, aktivne pa v prostoru za izdajo kemikalij, garderobi za čistilke in skladišču opreme. Pri aktivnih meritvah so bili analizirani časovni potek koncentracij, povprečni dnevni profil ter razlike med delovnim in nedelovnim časom. Kot dodatna podlaga za interpretacijo so bili uporabljeni tudi razpoložljivi mikroklimatski in obratovalni podatki sistema tehničnega upravljanja stavbe. Rezultati so pokazali nizke koncentracije radona v vseh obravnavanih prostorih. Povprečne koncentracije pri aktivnih meritvah so se pozimi gibale med 16 in 23 Bq/m³, poleti pa med 12 in 28 Bq/m³. Tudi pasivne meritve niso pokazale povišane obremenjenosti z radonom. Primerjava delovnega in nedelovnega časa ni pokazala enotnega vzorca, saj so bile koncentracije med delovnim časom nižje le v prostoru za izdajo kemikalij, medtem ko je bil v preostalih dveh aktivno spremljanih prostorih ugotovljen nasproten vzorec. Tudi sezonske razlike niso bile enotne, saj so bile pri dveh od treh aktivno spremljanih prostorov koncentracije pozimi višje kot poleti, v garderobi za čistilke pa je bila višja povprečna koncentracija ugotovljena poleti. Na podlagi izvedenih meritev je mogoče oceniti, da v času raziskave na obravnavanih delovnih mestih ni bila ugotovljena povečana obremenjenost z radonom. Izmerjene koncentracije so bile nižje od referenčne ravni 300 Bq/m³, pri čemer je treba upoštevati, da se ta nanaša na povprečno letno koncentracijo radona. Rezultati hkrati potrjujejo časovno in prostorsko spremenljivost radona ter kažejo na smiselnost periodičnega spremljanja koncentracij, zlasti v kletnih delovnih prostorih.

• Language: Slovenian
• Keywords: varnost in zdravje pri delu, radon, meritve koncentracije, delovno okolje, izpostavljenost zaposlenih
• Work type: Master's thesis/paper
• Organization: FKKT - Faculty of Chemistry and Chemical Technology
• Year: 2026
• PID: 20.500.12556/RUL-190444
• Publication date in RUL: 29.10.2026

Secondary language

• Language: English
• Title: Measurement of radon concentrations in indoor spaces and assessment of occupational exposure at workplaces

Abstract

Radon is a naturally occurring radioactive gas that may accumulate in enclosed spaces and pose a significant health risk to employees. The purpose of this master’s thesis was to determine radon concentrations in selected basement rooms of the Faculty of Chemistry and Chemical Technology at the University of Ljubljana, analyse their temporal and spatial variations, and assess employee exposure to radon at selected workplaces. Measurements were carried out during winter and summer measurement periods using active radon monitors and passive CR-39 track detectors. Passive measurements were conducted at ten measurement locations, while active measurements were performed in the chemical dispensing room, the cleaners’ changing room, and the equipment storage room. The active measurements were used to analyse temporal variations in radon concentrations, average daily profiles, and differences between working and non-working hours. Available microclimatic and operational data from the building management system were also used as supplementary information for the interpretation of the results. The results showed low radon concentrations in all investigated rooms. Mean concentrations obtained from active measurements ranged from 16 to 23 Bq/m³ in winter and from 12 to 28 Bq/m³ in summer. Likewise, the passive measurements did not indicate elevated radon levels. The comparison between working and non-working hours did not reveal a consistent pattern, as concentrations were lower during working hours only in the chemical dispensing room, while the opposite pattern was observed in the other two actively monitored rooms. Seasonal differences were also inconsistent, as concentrations were higher in winter than in summer in two of the three actively monitored rooms, whereas a higher mean concentration was observed in the cleaners’ changing room during summer. Based on the measurements, no increased radon concentrations were identified at the investigated workplaces during the study period. The measured concentrations were below the reference level of 300 Bq/m³, although it should be noted that this reference level applies to the annual average radon concentration. The results also demonstrate the temporal and spatial variability of radon concentrations and indicate the importance of periodic monitoring, particularly in basement workplaces.

• Keywords: occupational safety and health, radon, concentration measurements, work environment, employee exposure