Прегледај по Аутор "ĆURGUZ, Z."

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    ACTIVE AND PASSIVE RADON CONCENTRATION MEASUREMENTS AND FIRST-STEP MAPPING IN SCHOOLS OF BANJA LUKA, REPUBLIC OF SRPSKA*
    (EDITURA ACAD ROMANE, 2012) ĆURGUZ, Z.; ŽUNIĆ, Z. S.; TOLLEFSEN, T.; JOVANOVIČ, P.; NIKEZIĆ, D.; KOLARŽ, P.
    Radon concentration measurements were performed in all 25 primary schools in Banja Luka city, the capital of Republic of Srpska, during 2011 and 2012, using both active RAD7 continual radon measuring instruments and CR-39 passive (commercially known as Gamma) detectors. The two complimentary methods were employed not only to obtain annual averages, but also to study the dynamics of radon concentration changes during the week. For each school, average and temporal variations of radon concentrations were analysed, taking into consideration local geology, building materials and meteorological conditions. The influence of forced ventilation, caused by frequent opening of doors and windows during working hours, with typical dawn and weekend peaks is evident in most but not all schools. Elevated levels of radon concentration (>400 Bq m-3) were found in a few schools using both methods. Although high correlation factor of 0.8 between passive and active methods was found, still shorttime (one-week) measurements cannot be used for annual estimation of radon activity but only as a screening one. Thus, the conclusion concerns only long time measurements as valid indicator of annual radon activity.
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    FACTORS AFFECTING INDOOR RADON VARIATIONS: A CASE STUDY IN SCHOOLS OF EASTERN MACEDONIA
    (Editura Academiei Romane (eA), 2019) STOJANOVSKA, Z.; BOEV, B.; ZUNIC, Z. S.; IVANOVA, K.; AJKA, S.; BOEV, I.; ĆURGUZ, Z.; KOLARŽ, P.
    The subject of this study is the radon concentrations variations, measured with a nuclear track detectors in a total of 58 premises in all 29 primary schools of 4 municipalities in the Eastern part of the Republic of Macedonia. Despite a relatively small territory, the variability of radon concentrations proved to be significant. The geometric means (geometric standard deviations) of radon concentrations in the examined municipalities were in the range from GM = 71 Bq/m3 (GSD = 2.08) to GM = 162 Bq/m3 (GSD = 2.69), while for the entire region it was: GM = 96 Bq/m3 (GSD = 2.47). The influence of the geographical and geological features of the school site as well as the building characteristics on the radon variations were investigated. The analysis showed that type of municipality, building materials, basement and geology have significant effects and respectively describe 6%, 16%, 22%, 39% of the radon total variability.