Page 192 - 00. Complete Version - Progress Report IPEN 2014-2016

192 Nuclear Science and Technology | Progress Report

tal standards required in the relative method.

The INAA relative method is considered one
of the most accurate analytical methods, but
more and more neutron activation laborato-
ries in Brazil and in other countries all over the
world are using the k0-INAA method, due to
the quite accurate results obtained and the im-
provement of the analysis procedure and time.

The objective of this study was to compare the
results obtained by relative INAA and k0-IN-
AA methods at the IEA-R1 reactor of IPEN. The
same input parameters (sample mass, nucle-
ar data, net peak area for the same gamma
line and the same measurement and same
cooling and measurement times) were em-
ployed in the analysis of reference materials
of different matrices: basalt BE-N (IWG-GIT),
SOIL-5 (IAEA), Buffalo River Sediment (NIST-
BRS-8704), INCT-MPH-2 Mixed Polish Herbs,
Oyster Tissue (NIST-SRM-1566b) and Bovine
Liver (NIST-SRM-1577c). The k0-standardiza-
tion method has been applied by using the k0_
IAEA software. To evaluate the accuracy of the
results, bias (%) and En-number test were ap-
plied to the results obtained for more than 20
elements in the analysis of the reference ma-
terials. The results pointed to the possibility of
using the k0-INAA method with good accura-
cy. (Financial Support: CNEN, CNPq).

Instituto de Pesquisas Energéticas e Nucleares