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Measurement of radionuclides in soil and indoor radon on Kosovo and Metohija

dc.contributor.advisorKrstić, Dragana
dc.contributor.otherNikezić, Dragoslav
dc.contributor.otherŽunić, Zoran
dc.contributor.otherMilić, Gordana
dc.creatorGulan, Ljiljana
dc.date.accessioned2018-12-28T09:17:00Z
dc.date.available2018-12-28T09:17:00Z
dc.date.available2020-07-03T15:08:56Z
dc.date.issued2014-09-23
dc.identifier.urihttp://nardus.mpn.gov.rs/handle/123456789/10552
dc.identifier.urihttp://eteze.kg.ac.rs/application/showtheses?thesesId=6406
dc.identifier.urihttps://fedorakg.kg.ac.rs/fedora/get/o:1041/bdef:Content/download
dc.description.abstractSAŽETAK: U ovom radu su gamaspektrometrijski određene aktivnosti radionuklida 226Ra, 232Th, 40K i 137Cs u 104 uzorka zemljišta sa 74 lokacije na Kosovu i Metohiji; njihove srednje vrednosti iznose: 33, 35, 608 i 48 Bq kg-1, respektivno. Srednja vrednost jačine doze gama zračenja koju prima stanovništvo usled spoljašnjeg izlaganja prirodnim izvorima jonizujućih zračenja iz tla iznosi 61.5 nGy h-1 i slična je dobijenim vrednostima u susednim zemljama. Doprinos efektivnoj dozi od prirodnih radionuklida je 87% (75.4 μSv y-1), dok je doprinos dozi od 137Cs 13% (11.6 μSv y-1); srednja vrednost indeksa radijacionog rizika usled spoljašnjeg izlaganja je 0.35. Izmerene aktivnosti i procenjeni parametri ukazuju da na Kosovu i Metohiji ne postoji značajan rizik za stanovništvo usled spoljašnjeg izlaganja izvorima jonizujućih zračenja iz tla. Utvrđeno je postojanje jake korelacije između prirodnih radionuklida, što govori o njihovoj geohemijskoj povezanosti; pokazano je da nema korelacija prirodnih radionuklida sa veštačkim radionuklidom 137Cs. U radu su predstavljeni i rezultati merenja radona, torona i njihovih potomaka u zatvorenim prostorijama pasivnom integracionom metodom pomoću trag detektora (CR- 39 i LR115) na 113 lokacija na Kosovu i Metohiji. Prema prosečnoj koncentraciji radona iz dve prostorije u objektima (129 Bq m-3), srednja godišnja efektivna doza usled izlaganja radonu i njegovim potomcima iznosi 3.25 mSv y-1. Identifikovane su lokacije na kojima postoji povećan rizik usled izlaganja radonu u zatvorenim prostorijama; uzrok je povišen sadržaj radionuklida u tlu. Procenjena godišnja efektivna doza usled izlaganja toronu i njihovim potomcima je 4 puta veća od prosečne svetske vrednosti. U okviru rada prvi put su direktno merene ravnotežne ekvivalentne koncentracije radona (EERC) i torona (EETC) i na osnovu njih su određeni ravnotežni faktori za radon i toron za atmosfere zatvorenih prostorija i oni iznose 0.47 i 0.021, respektivno. Utvrđene su slabe pozitivne korelacije 226Ra i 232Th sa izotopom radona 222Rn; između ostalih radionuklida i izotopa radona nema korelacija. Analizirane su i diskutovane korelacije između izmerenih koncentracija radona i torona (R2=0.032) i korelacije između odgovora različitih vrsta detektorskih sistema.sr
dc.description.abstractSUMMARY: In this study, the specific activities of radionuclides 226Ra, 232Th, 40K and 137Cs in 104 soil samples collected from 74 locations of Kosovo were determined by gamma ray spectrometry; the mean values were found: 33, 35, 608 and 48 Bq kg-1, respectively. The mean value of absorbed dose rate in the air due to natural sources of ionizing radiation from the soil is 61.5 nGy h-1 and it is similar to the values obtained in the neighboring countries. The contribution to the effective dose from natural radionuclides is 87% (75.4 μSv y-1), while the contribution to the dose that comes from 137Cs is 13% (11.6 μSv y-1); mean value of external hazard index is 0.35. The measured activities and the estimated parameters indicate that there is no significant risk to the population of Kosovo and Metohija due to external exposure to ionizing radiation from the soil. A strong positive correlation exists between natural radionuclides, indicating their geochemical relation; it has been shown that there is no correlation between natural radionuclides and artificial radionuclide 137Cs. The thesis presents the results of measurements indoor radon, indoor thoron and their progenies using passive integration method with track detectors (CR-39 and LR115) at 113 locations in Kosovo and Metohija. According to the average indoor radon concentration in two rooms of dwellings (129 Bq m-3), the mean annual effective dose from exposure to radon and its progenies amounts 3.25 mSv y-1. Locations with an increased risk from exposure to indoor radon were identified; cause of the high content of radionuclides in the soil. The mean annual effective dose from exposure to thoron and its progenies is 4 times higher than the world average values. Equilibrium equivalent concentration of radon (EERC) and thoron (EETC) were directly measured for the first time and from them certain equilibrium factors for radon and thoron of indoor atmospheres were calculated and they are 0.47 and 0.021, respectively. Weak positive correlation of 226Ra and 232Th with radon isotope 222Rn were found; there is no correlation between the other radionuclides and radon isotopes. The correlation between the measured concentration of radon and thoron (R2 = 0.032) were analyzed and discussed and also correlation between the responses of different detector types.en
dc.formatapplication/pdf
dc.languagesr
dc.publisherУниверзитет у Крагујевцу, Природно-математички факултетsr
dc.relationinfo:eu-repo/grantAgreement/MESTD/Integrated and Interdisciplinary Research (IIR or III)/41028/RS//
dc.relationinfo:eu-repo/grantAgreement/MESTD/Integrated and Interdisciplinary Research (IIR or III)/43002/RS//
dc.relationinfo:eu-repo/grantAgreement/MESTD/Basic Research (BR or ON)/171021/RS//
dc.rightsopenAccessen
dc.sourceУниверзитет у Крагујевцуsr
dc.subjectradonsr
dc.subjecttoronsr
dc.subjectefektivna dozasr
dc.subjectkorelacijasr
dc.titleMerenje radionuklida u tlu i radona u zatvorenim prostorima na Kosovu i Metohijisr
dc.title.alternativeMeasurement of radionuclides in soil and indoor radon on Kosovo and Metohijaen
dc.typedoctoralThesis
dc.rights.licenseBY
dc.identifier.fulltexthttp://nardus.mpn.gov.rs/bitstream/id/47604/Disertacija.pdf
dc.identifier.fulltexthttp://nardus.mpn.gov.rs/bitstream/id/47605/Ljiljana_Gulan_PMF.pdf


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