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AbstractAbstract
[en] This contract is concerned with development of methods for detection of fission products i the heavy water and quantitative radiochemical analysis for detecting one fission product which enables reliable verification of heavy water contamination by fission products and estimation of contamination level. Qualitative and quantitative radiometry measurements of fission products in water are shown on page 4. Page 6 shows study of contamination and decontamination of water on the laboratory level. Experiments have shown that the majority of fission products was adsorbed on the uranium oxide and that the iodine isotopes are partly in water (non-adsorbed). Gamma spectrometry analyses showed 131 I moves to distillate with the initial quantities of distilled water. decontamination factors compared to the total activity of fission products in distillator and distillate are not higher than ∼103. Decontamination of water contaminated by uranium oxide and fission products in the distillation device of the RA reactor is shown on page 8. Experiments demanded special preparation due to high activity of uranium (1.7 g of uranium irradiated in the reactor for 10 days at neutron flux 1.1013 n.cm2/s. Prior preparations for transport and dissolution of irradiated metal uranium as well as sampling were needed. Distillation was done under lower pressure and temperature to avoid possible contamination of the environment bu fission products and iodine. Decontamination factors are shown in Table. Contamination and decontamination of stainless steel on the laboratory level are described on page 5. It was found that the deposition of activity on the stainless steel plates is inhomogeneous showing that the uranium oxide and fission products are deposited on the rough metal surfaces. According to literature data and our laboratory studies decontamination was done by nitric acid solution (2MHNO3). Since the heavy water system of the RA reactor was made of stainless teel (except the reactor core) this solution was used for decontamination of the distillation device. After decontamination this device was washed by tap water until disappearance of activity in the water
[sr]
Rad po ovom ugovoru sastoji se u razradi metoda za detekciju fisionih produkata u teskoj vodi kao i kvantitativne radiohemijske analize pri odredjivanju jednog izotopa - fisionog produkta koji nam omogucava da sa sigurnoscu utvrdimo da se radi o kontaminaciji teske vode fisionim produktima i ukaze na velicinu i obim kontaminacije. Na strani 4 prikazana su kvalitativna i kvantitativna radiometrijska merenja fisionih produkata u vodi. Na stani 6 prikazano je ispitivanje kontaminacije i dekontaminacije vode na laboratorijskom nivou. Eksperimenti su pokazali da je veci deo fisionih produkata apsorbovanih na oksidu urana a da se izotopi joda nalaze jednim delom u vodi (neasorbovani). Gama spektrometrijske analize su pokazale da sa prvim kolicinama destilisane vode i 131 J prelazi u destilat. Dekontaminacioni faktori u odnosu na totalnu aktivnost fisionih produkata u destilatoru i destilatu nisu veci od ∇ 104. Na strani 8 prikazana su ispitivanja dekontaminacije vode od oksida urana i fisionih produkata na destilacionoj aparaturi reaktora RA. Eksperimenti su zahtevali posebnu pripremu zbog visoke aktivnosti urana (1.7 g urana ozracenog u reaktoru 10 dana na fluksu 1.1013n.cm2/sec). U tu svrhu su izvrsene prethodne pripreme za transport i rastvaranje ozracenog metalnog urana u destilatoru kao i uzimanje proba. Destilacija je izvodjena pod snizenim pritiskom i temperaturom zbog moguce kontaminacije prostorija sa fisionim gasovima kao i jodom. Faktori dekontaminacije prikazani su na tabeli 3. Na strani 5 prikazana su ispitivanja kontaminacije i dekontaminacije nerdjajuceg celika na laboratorijskom nivou. Ispitivanja su pokazala, sa plocicama od nerdjajuceg celika, da je depozicija aktivnosti nehomogena sto ukazuje da se oksid urana i fisioni produkti deponuju u risovima neobradjenih povrsina metala. Prema literaturnim podacima kao i nasim laboratorijskim ispitivanjima dekontaminacija plocica od nerdjajuceg celika izvodjena je sa rastvorom azotne kiseline (2MHO3). Posto je sistem za tesku vodu na reaktoru RA sagradjen od nerdjajuceg celika (sem jezgra reaktora) to je ovaj rastvor bio upotrebljen za dekontaminaciju aparature za destilaciju. Posle dekontaminacije aparatura je prana vodovodnom vodom sve do nestanka aktivnosti u vodi (author)Original Title
Kontaminacija i dekontaminacija i sigurnosne radiohemijske analize reaktora RA (Izvestaj za 1966. godinu)
Primary Subject
Secondary Subject
Source
Dec 1966; 23 p; RA--03-1001/31; Also available from the Institute of nuclear sciences Vinca; 3 tabs, 6 figs, 26 refs
Record Type
Miscellaneous
Report Number
Country of publication
ACTINIDE COMPOUNDS, ALLOYS, BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, CARBON ADDITIONS, CHALCOGENIDES, CHEMICAL ANALYSIS, CLEANING, DAYS LIVING RADIOISOTOPES, DEUTERIUM COMPOUNDS, ENRICHED URANIUM REACTORS, EQUIPMENT, HEAVY WATER COOLED REACTORS, HEAVY WATER MODERATED REACTORS, HIGH ALLOY STEELS, HYDROGEN COMPOUNDS, INORGANIC ACIDS, INORGANIC COMPOUNDS, INTERMEDIATE MASS NUCLEI, IODINE ISOTOPES, IRON ALLOYS, IRON BASE ALLOYS, IRRADIATION REACTORS, ISOTOPE PRODUCTION REACTORS, ISOTOPES, MATERIALS, NITROGEN COMPOUNDS, NUCLEI, ODD-EVEN NUCLEI, OXIDES, OXYGEN COMPOUNDS, QUANTITATIVE CHEMICAL ANALYSIS, RADIOACTIVE MATERIALS, RADIOISOTOPES, REACTORS, RESEARCH AND TEST REACTORS, RESEARCH REACTORS, STEELS, TANK TYPE REACTORS, THERMAL REACTORS, TRANSITION ELEMENT ALLOYS, URANIUM COMPOUNDS, URANIUM OXIDES, WATER
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