On the use of coincidence INAA for selenium determination
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2021
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REUNIÃO DE TRABALHO SOBRE FÍSICA NUCLEAR NO BRASIL, 44.
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Instrumental Neutron Activation Analysis (INAA) is a widely used technique applied on the
determination of several elements in different matrices. Selenium is one of the elements that can
be studied by INAA and its determination is usually performed using one, or both, 136:01 and
264:66 keV transitions from 75Se radioisotope. Se determination by INAA is a case that requires
special attention, mainly in virtue of three issues: (i) spectral interferences may occur due to intense
gamma rays from 181Hf (136 keV) and 182Ta (264 keV); (ii) in samples with high levels of K and Na,
the increased background levels due to Compton effect lead to enlargement of the detection limit;
(iii) high concentration of P or any other intense high-energy beta emitter can severely impact the
detection below 200{300 keV due to bremsstrahlung radiation. A possible solution for these issues
is the use of gamma-gamma coincidence INAA (CINAA), as the 136 and 264 keV transitions are
part of a strong gamma-gamma cascade.
In this work coincidence measurements of the decay of 75Se were performed to compare the
results for Se obtained by conventional INAA and CINAA in biological and geological Certi ed
Reference Materials (CRMs). The results show that the use of coincidence can drastically reduce
the net/gross ratio, which implies in a reduction of the detection limit for 75Se; furthermore, the
results of Se concentration obtained using both methodologies are in agreement with the certi ed
values, and both techniques provided accurate results.
Como referenciar
RIBEIRO JUNIOR, IBERE S.; ZAHN, GUILHERME S.; GENEZINI, FREDERICO A.; DRESCHER, ADAM; LANDSBERGER, SHELDON. On the use of coincidence INAA for selenium determination. In: REUNIÃO DE TRABALHO SOBRE FÍSICA NUCLEAR NO BRASIL, 44., 9-11 de novembro, 2021, Online. Resumo... São Paulo, SP: Sociedade Brasileira de Física, 2021. Disponível em: http://repositorio.ipen.br/handle/123456789/33546. Acesso em: 31 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.