Autori:
1. Kremena Ivanova, National Centre of Radiobiology and Radiation Protection, Sofia, Bulgaria, Bulgaria
2. Todor Yordanova, National Centre of Radiobiology and Radiation Protection, Sofia, Bulgaria, Bulgaria
3. Desislava Djuvnakova, National Centre of Radiobiology and Radiation Protection, Bulgaria
4. Zdenka Stojanovska, Faculty of Medical Sciences, Goce Delčev University Stip, Macedonia

Apstrakt:
This paper aims to analyze the spatial distribution of annual radon concentrations in dwellings within the Lovech district, Bulgaria. A detailed study of average annual radon concentration was conducted to identify areas with a higher potential for radon entry into buildings in the Lovech district. The surveyed dwellings were 683 number. The number of detectors used for the representative sample was determined based on their area, with an expected geometric mean deviation for a log-normal distribution at an accuracy level of 0.2 and a confidence level of 95%. For each municipality, adjustments to the number of detectors were made based on the number of dwellings and population. Passive long-term track detectors type RSFV were utilized, consisting of two CR-39 chips placed in cylindrical diffusion chambers for the RADOSYS system. Detectors were deployed at sampling sites for a full year, from March/April 2023 to March/April 2024, according to the measurement start time. The annual arithmetic mean radon level for ground-floor dwellings from the detailed survey during 2023–2024 is 104 Bq/m3, with values ranging from 7 to 686 Bq/m3. The geometric mean (GM) of the detailed survey results, with a one-year sampling period, is 79 Bq/m3, with a standard geometric deviation of 2.17 and a median of 79 Bq/m3. The hypothesis that radon levels in the Lovech district follow a log-normal distribution (KS, p=0.24 >0.05) is confirmed. Data analysis by municipality, building type, number of floors, and presence of an underground floor revealed statistically significant differences. A model for the distribution of annual radon concentration in the area has been studied, which can be used to develop a detailed map of the region.

Ključne reči:
radon,dwellings,track detectors,Lovech district,ground floor,annual concentration

Tematska oblast:
SIMPOZIJUM A - Nauka materije, kondenzovane materije i fizika čvrstog stanja

Datum prijave sažetka:
11.08.2025.

Konferencija:
Contemporary Materials 2025 - Savremeni Materijali

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