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Istraživanje gasovitih radioaktivnih produkata uranijuma i torijuma / Research of the gaseous radioactive products of uranium and thorium

<p>U okviru ove doktorske disertacije autor već duže vreme radi&nbsp;na razvijanju i primeni niskofonske gama-spektrometrije na&nbsp;određivanju sadržaja uranijuma i ostalih radionuklida gama&nbsp;emitera u uzorcima zemlji&scaron;ta i sedimenta, kao i na praćenju&nbsp;<br />njihove distribucije i korelacije &scaron;to je od značaja za mapiranje&nbsp;radioaktivnosti poljoprivrednog zemlji&scaron;ta. Pored toga&nbsp;doktorant se bavi proučavanjem ravnoteže u radioaktivnim&nbsp;nizovima uranijuma i torijuma, čiji gasoviti produkti radon&nbsp;<sup>222</sup>Rn i toron&nbsp;<sup>220</sup>Rn kao inertni gasovi difuzijom napu&scaron;taju&nbsp;mesto generisanja i na taj način obrazuju značajne&nbsp;koncentracije u zatvorenim prostorima, &scaron;to predstavlja veliki&nbsp;<br />problem za niskofonske podzemne laboratorije i radijacioni&nbsp;rizik izloženog stanovni&scaron;tva. U sklopu ovih istraživanja&nbsp;razvijen je i egzaktan matematički model za određivanje&nbsp;<br />faktora ravnoteže između radona i torona i njihovih&nbsp;kratkoživećih produkata. Dobijeni rezultati će se koristiti za&nbsp;testiranje postojećih metoda merenja radona razvijenih u&nbsp;<br />laboratoriji i primenu za merenje koncentracije aktivnosti&nbsp;radona u urbanim sredinama. Ujedno proučavanje ovih pojava&nbsp;i iznalaženje korekcija na raspad može imati primenu i u&nbsp;drugim nuklearnim analitičkim tehnikama kod kojih je period&nbsp;poluraspada mete uporediv sa vremenom merenja.</p> / <p>In this dissertation the author has been working on the&nbsp;development and application of low-level gamma spectrometry&nbsp;method to determine the content of uranium and other&nbsp;radionuclides gamma emitters in soil and sediment, as well as&nbsp;monitoring their distribution and correlation which is important&nbsp;to map the radioactivity of agricultural soil. In addition, author&nbsp;studies the equilibrium in the radioactive series of &nbsp;uranium and&nbsp;thorium, which gaseous products radon&nbsp;<sup>222</sup>Rn and thoron&nbsp;<sup>220</sup>Rn as inert gases leave the place of origin by diffusion and&nbsp;thus forming significant concentrations indoors, which is a&nbsp;significant problem for the low-level underground laboratories&nbsp;and population radiation risk. As part of this research an exact&nbsp;model for the determination of radon and thoron equilibrium&nbsp;was developed. The results will be used to test existing&nbsp;methods of measuring radon developed in the laboratory and&nbsp;the application of the measurement of radon activity&nbsp;concentration in urban areas. At the same time the study of&nbsp;these phenomena and decay corrections may have application&nbsp;in other nuclear analytical techniques in which the half-life of&nbsp;the target is comparable with the time of measurement.</p>

Identiferoai:union.ndltd.org:uns.ac.rs/oai:CRISUNS:(BISIS)87662
Date17 January 2014
CreatorsForkapić Sofija
ContributorsBikit Ištvan, Vesković Miroslav, Mrđa Dušan, Nikezić Dragoslav
PublisherUniverzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, University of Novi Sad, Faculty of Sciences at Novi Sad
Source SetsUniversity of Novi Sad
LanguageSerbian
Detected LanguageUnknown
TypePhD thesis

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