AbstractAbstract
[en] The present work describes the procedure carried out for the preliminary determination of neutron flux parameters for the nuclear research reactor IAN-R1 (RNI IAN-R1) through the not covered triple monitor method in the nucleus peripheral irradiation position. Using this method, the thermal flux value (φth), the epithermal neutron flux symmetry factor (α) and the ratio between thermal neutron fluxes with respect to the epithermal neutron flux (f) were estimated. Those parameters were obtained by irradiating zirconium (Zr) monitors and a gold-aluminum alloy monitors (Au-Al 0.1% Au), which were irradiated at the G3 and G4 irradiation positions of the RNI IAN-R1. The following values were found for the parameters estimated at an operating power of 30 kW, φth= 2,1 * 1011 cm2 s-1 (variance CV 4%), α = 0,02 (CV 83 %), and f =67 (CV 8 %). The high variance in α could be explained if we consider that the method only uses 3 capture reactions to describe the epithermal neutron spectrum. The variance could be improved by application of multimonitor methods for neutron flux characterization.
Original Title
Implementacion del metodo del triple monitor para la caracterizacion del flujo neutronico del reactor nuclear de investigacion IAN-R1
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Journal Article
Journal
Revista de Investigaciones y Aplicaciones Nucleares; ISSN 2590-7468;
; v. 2; p. 35-42

Country of publication
ACTIVATION ANALYSIS, CHEMICAL ANALYSIS, DEVELOPING COUNTRIES, ENRICHED URANIUM REACTORS, IRRADIATION REACTORS, ISOTOPE PRODUCTION REACTORS, LATIN AMERICA, NONDESTRUCTIVE ANALYSIS, POOL TYPE REACTORS, RADIATION FLUX, REACTORS, RESEARCH AND TEST REACTORS, RESEARCH REACTORS, SOUTH AMERICA, THERMAL REACTORS, TRAINING REACTORS, WATER COOLED REACTORS, WATER MODERATED REACTORS
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AbstractAbstract
[en] This work describes a procedure conducted using the neutron activation analysis technique for the validation of lanthanum (La) mass fraction determination in soil matrices. This study shows the principles of application of the relative method to instrumental neutron activation analysis and presents the experimental procedure used to evaluate the following performance parameters: selectivity, linearity, detection limit, quantification limit, precision, trueness and uncertainty. The results show that in the range of 0.66 to 38.0 mg/kg La, the method satisfies the acceptance criteria established in the validation process; as a consequence, the assaying of La by the developed method offers satisfactory results.
Original Title
Determinacion de la fraccion de masa de lantano (La) en suelos mediante analisis por activacion neutronica
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Secondary Subject
Record Type
Journal Article
Journal
Revista Investigaciones y Aplicaciones Nucleares (Online); ISSN 2711-1326;
; v. 4; p. 5-15

Country of publication
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