RESUMO
The consistency of the published values for fission averaged cross-sections of threshold reactions induced in a nuclear reactor is analyzed. The influence of the literature data involved in the determination of these cross-sections is discussed. Renormalizations based on cross-sections value for the standard reactions, isotopic abundances of the precursors and radiation emission probabilities of the radionuclide under study and the monitor, are applied to the evaluation of the cross-sections for the reactions: (46)Ti(n,p)(46)Sc; (47)Ti(n,p)(47)Sc; (48)Ti(n,p)(48)Sc; and (64)Zn(n,p)(64)Cu.
Assuntos
Radioisótopos de Cobre/química , Nêutrons , Fissão Nuclear , Radiometria/métodos , Escândio/química , Titânio/química , Radioisótopos de Zinco/química , Radioisótopos de Cobre/efeitos da radiação , Isótopos/química , Isótopos/efeitos da radiação , Doses de Radiação , Escândio/efeitos da radiação , Titânio/efeitos da radiação , Radioisótopos de Zinco/efeitos da radiaçãoRESUMO
This work presents the experience developed by the Radioisotope Metrology Laboratory (LMR), of the Argentine National Atomic Energy Commission (CNEA), as result of the accreditation process of the Quality System by ISO 17025 Standard. Considering the LMR as a calibration laboratory, services of secondary activity determinations and calibration of activimeters used in Nuclear Medicine were accredited. A peer review of the (alpha/beta)-gamma coincidence system was also carried out. This work shows in detail the structure of the quality system, the results of the accrediting audit and gives the number of non-conformities detected and of observations made which have all been resolved.
Assuntos
Acreditação/organização & administração , Laboratórios/normas , Medicina Nuclear/organização & administração , Garantia da Qualidade dos Cuidados de Saúde/organização & administração , Monitoramento de Radiação/normas , Proteção Radiológica/normas , Compostos Radiofarmacêuticos/análise , Acreditação/métodos , Argentina , Doses de Radiação , Compostos Radiofarmacêuticos/normasRESUMO
A method for determination of aluminum and phosphorus in biological materials, based on activation in a nuclear reactor and measurement of 28Al, produced by the 27Al(n, gamma)28Al and 31P(n, alpha)28Al reactions, is described. Irradiations in the undisturbed and epicadmium spectra provide a two-equation system in order to determine the contributions of aluminum and phosphorus to the total activities. Germanium is used as an integral flux monitor and comparator, through the reactions: 74Ge(n, gamma)75Ge, 76Ge(n, gamma)77Ge, and 72Ge(n,p)72Ga.
