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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

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

Forkapić Sofija 17 January 2014 (has links)
<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>

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