RÉSUMÉ
A 4πγ integral counting system with a NaI(Tl) well-type detector and a digital interface to acquire measurement data was implemented at LMR-CNEA. The detection efficiency as a function of the energy was computed by Monte Carlo simulations and the total efficiencies for ampoules and point sources were calculated considering all the decay branches. A computer code was developed to analyse data. This program reads the files generated by the digitizer module, corrects for dead time and calculates source activities and their uncertainties. Ampoules with solutions of 113Sn, 192Ir and 131I were measured.
RÉSUMÉ
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.
Sujet(s)
Agrément/organisation et administration , Laboratoires/normes , Médecine nucléaire/organisation et administration , Assurance de la qualité des soins de santé/organisation et administration , Contrôle des radiations/normes , Radioprotection/normes , Radiopharmaceutiques/analyse , Agrément/méthodes , Argentine , Dose de rayonnement , Radiopharmaceutiques/normesRÉSUMÉ
Multigamma simulated-gas standards were developed for monitoring the surrounding air at nuclear power plants by several commercial firms and laboratories. The main advantages of our simulated-gas standard consist of the easy preparation, gravimetrically spiking the matrix with a standardised multigamma radioactive solution. and that it does not require to be tested against actual gas standards. Self-attenuation correction factors for low gamma-ray energies were calculated. Original studies about the stability of the adherence of the dried radioactive residue to the matrix are presented and discussed.