Neutron activation analysis lifetimes
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2010
Autores IPEN
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REUNIAO DE TRABALHO SOBRE FISICA NUCLEAR NO BRASIL, 33.
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Resumo
Lifetime measurements are very important to study beta and gamma decay properties and are also important to
identify and quantify nuclides using the parametric Neutron Activation Analysis (NAA)[1]. Beta decay lifetime
affects for example the path of r-process in stellar nucleosynthesis. In this work NAA technique was applied
to determine beta decay lifetime of isotopes produced at the IEA-R1 nuclear reactor at the IPEN facilities.
We have used a standard reference material supplied by the IAEA (soil-7, 2709 and 2710) and NIST (8414,
1486, 1400, 1573a and 1577b) to produce short (minutes) and long-lived (hours to days) isotopes. After the
irradiation, the activated samples are gamma-counted using a HPGe Spectrometer of High Energy Resolution
and the gamma-ray peaks, corresponding to gamma transitions, related to the nuclides of interest, are evaluated
using in-house software. The peak areas from the identified isotopes were tracked from one, five and ten minutes
spectra for the short-lived element measurements and thirty and sixty minute gamma-ray spectra in order to
extract the long-lived elements. We have measured the lifetimes for the isotopes 28Al,52V, 24Na, 42K, 56Mn and
140La. The lifetime results were compared with the known values from literature [1] and we have succeeded to
improve the measurements for these beta-decay lifetimes.
Como referenciar
OKIMURA, H.H.; SILVEIRA, M.A.G. da; MEDINA, N.H.; ZAMBONI, C.B. Neutron activation analysis lifetimes. In: REUNIAO DE TRABALHO SOBRE FISICA NUCLEAR NO BRASIL, 33., 7-11 de setembro, 2010, Campos do Jordao, SP. Resumos... p. 38. Disponível em: http://repositorio.ipen.br/handle/123456789/21218. Acesso em: 30 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.
Assuntos
aluminium 28; aluminium; beta decay radioisotopes; beta decay; cosmochemistry; days living radioisotopes; half-life; heavy ion spectrometers; iear-1 reactor; lanthanum 140; lanthanum; lifetime; manganese 56; neutron activation analysis; nucleosynthesis; particle widths; potassium 42; sodium 24; vanadium 52