Open AccessCalibration Of The Short Irradiation Facility For k0 - NAA Implementation At The IEA-R1 Reactor
Author(s) -
João Pedro Oliveira Flores,
Paulo Sérgio Cardoso da Silva,
Mauro S.S. Dias,
Marina F. Koskinas,
Denise S. Moreira,
Ione M. Yamazaki
Publication year - 2021
Publication title -
brazilian journal of radiation sciences
Language(s) - English
Resource type - Journals
ISSN - 2319-0612
DOI - 10.15392/bjrs.v9i1a.1570
Subject(s) - irradiation , research reactor , radiochemistry , neutron activation analysis , neutron flux , reproducibility , materials science , calibration , neutron , neutron activation , spectrometer , nuclear engineering , calibration curve , neutron irradiation , neutron temperature , analytical chemistry (journal) , nuclear physics , chemistry , physics , detection limit , optics , chromatography , quantum mechanics , engineering
The short irradiation facility of the IEA-R1 nuclear research reactor at IPEN, São Paulo, Brazil, has been used for short irradiation of samples for the purpose of determining the concentration of elements of these samples through the use of the instrumental neutron activation analysis technique. With the aim of implementing the k0-NAA method at the Neutron Activation Analysis Laboratory (LAN), the reactor parameters a and f were obtained using the bare triple method. In this method, a set of three neutron flux monitors were irradiated without Cd-cover. The efficiency curve of the gamma-ray spectrometer used was determined by measuring calibrated radioactive sources at the commonly used counting geometries. The results for the parameters a and f were respectively 0.0384±0.0016 and 35.67±0.26. This value of f shows that the neutrons in the irradiation position are well thermalized.The variation of these parameters was studied with time and the reproducibility was verified.