1,720,982 research outputs found
Nuclear chemistry, radiochemistry, radiation chemistry, health physics and sustainable nuclear energy production
No full textNuclear Chemistry, Radiochemistry, Radiation Chemistry and Heath Physics play a fundamental role in sustainable nuclear energy production. Their applications are crucial in each stage of the nuclear power cycle. There will be stressed some particular chemical steps concerning the extraction and production of fuel pellets, claddings and assemblies, water radiolysis, plant decommissioning and their reprocessing or disposal cycle. The objectives of this work are: the presentation and the discussion about strength and weakness of the nuclear and radiochemical methods to be used in the sustainable production of nuclear energy and the stressing of the great need of education and training of young scientists in the field of. nuclear and radiochemical (N&R) techniques, in order to ensure a sustainable supply of qualified personnel, whose number have declined steadily and dramatically in the last 20 years. A review on main problematic regarding the different fuel cycles is presented, distinguishing between the traditional open fuel cycle (UOT) adopted in many Countries and the more advanced close cycle, with reprocessing of the nuclear rad-waste, taking into account the partitioning (P) and transmutation (P&T) of U and Pu radionuclides, fission products (FPs), minor actinoids (MAs) and activation products
Content of trace elements in the respirable fractions of the air particulate of urban and rural areas monitored by Neutron Activation Analysis
No full textThe concentrations (ng/m3) of more than 30 trace elements have been determined in the total air particulate matter and in the size-segregated fractions collected in urban, industrialized, and rural residential areas in northern Italy by means of a multistage inertial impactor with the PM10 inlet. All measurements have been carried out by instrumental neutron activation analysis, except for Pb and Cd, which have been determined by electrothermal atomic absorption spectroscopy. Analytical quality assurance procedures have been developed with special regard to blanks, reagents, and sampling. Total concentrations and the granulometric distribution found in the different locations are reported and compared
Radioanalytical Quality Controls by INAA and RNAA determination of Specific Activity, Chemical Purity and Isotopic Composition of labelled compounds
No full textStudio delle concentrazioni degli elementi in tracce e della loro distribuzione granulometrica nel particolato atmosferico di zone urbane e industrializzate mediante analisi per attivazione neutronica.
No full textDeterminazione di elementi in traccia nel particolato atmosferico mediante analisi per attivazione neutronica.
No full textIl ruolo della chimica nucleare e della radiochimica nello sviluppo dell’energia nucleare
No full textImproved radiochemical separation of No-Carrier-Added vanadium-48 from proton irradiated titanium target
No full textA novel radiochemical separation for 48V radiotracer in no-carrier-added (NCA) form, via proton irradiation on Ti targets of natural isotopic composition has been developed. Metallic Ti targets irradiated with 21 MeV proton beam energy was submitted to a selective radiochemical separation consisting of an alkaline fusion-precipitation step, followed by column Chelex-100 chromatographic purification. Very high specific activity 48V, at levels of hundreds MBq .microg-1 was prepared. Chemical analysis of radiotracer was carried out by ET-AAS and INAA. The decontamination factor from Ti target was 5.10E5, with an overall radiochemical yield for 48V larger than 90%. The NCA 48V has used for labeling a range of chemical forms of V(III, IV, V) and applied in the study of metabolic behavior of different chemical forms in in-vivo and in-vitro experiments on rats and cell cultures
Determinazione di elementi metallici in tracce, mediante attivazione neutronica, nella mucosa orale: studio preliminare. Nota I: protocollo e metodologie di ricerca.
No full textCyclotron production of “No Carrier Added” platinum, palladium and rhodium radionuclides for metallo-toxicological studies
No full text
- …
