<p>U disertaciji je izvršena optimizacija detektorskog IZ sistema Quantulus 1220<sup>TM</sup> radi razvoja metoda za određivanje pojedinačnih radionuklida <sup>3</sup>H,<sup> 222</sup>Rn i<sup> 90</sup>Sr, kao i ukupne alfa/beta aktivnosti u vodama. Predstavljeni su eksperimenti u svrhu kalibracije sistema, istraživanja uticaja relevantnih parametara na rezultate određivanja aktivnosti alfa i beta emitera, i podešavanja optimalnih vrednosti ovih parametara. Posebna pažnja je posvećena variranju PSA diskriminatora, odnosno podešavanju analizatora oblika impulsa na optimalnu vrednost u svrhu optimalnog razdvajanja alfa od beta događaja, kao i ispitivanju efekata prigušenja u uzorcima i metodama njihove korekcije. Predstavljene razvijene metode su brze, efikasne i jednostavne, što je naročito važno u slučaju radijacionog akcidenta, kada je potrebno brzo odrediti sadržaj radionuklida u uzorcima vode, a njihova validnost je pokazana u okviru međunarodnih<br />i međulaboratorijskih interkomparacija.</p> / <p>Dissertation involves optimization of detector AB system Quantulus 1220<sup>TM</sup> for development of methods for determination of individual radionuclides <sup>3</sup>H, <sup>222</sup>Rn and <sup>90</sup>Sr, as well as gross alpha/beta activity in waters. Presented experiments had purpose of calibration of the system, investigation of relevant parameters influence on activity measurements of alpha and beta emitters, as well as setting the optimum values of these parameters. Special attention was devoted to PSA discriminator value setting, i.e. adjusting the pulse shape analyzer level at optimum value for an optimal separation of alpha from beta events, as well as testing the effects of quenching in the samples and methods for quench correction. Presented developed methods are fast, efficient and simple, which is especially important in the case of a radiation accident, when there is a need to quickly determine the content of radionuclides in water samples, and their validity has been demonstrated within the framework of international and inter-laboratory ntercomparison measurements.</p>
| Identifer | oai:union.ndltd.org:uns.ac.rs/oai:CRISUNS:(BISIS)95552 |
| Date | 31 October 2015 |
| Creators | Stojković Ivana |
| Contributors | Todorović Nataša, Krmar Miodrag, Kozmidis-Luburić Uranija, Krajcar Bronić Ines |
| Publisher | Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, University of Novi Sad, Faculty of Sciences at Novi Sad |
| Source Sets | University of Novi Sad |
| Language | Serbian |
| Detected Language | English |
| Type | PhD thesis |
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