On the use of gamma-gamma coincidence to detect very low activities
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2017
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BRAZILIAN MEETING ON NUCLEAR PHYSICS, 40th
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Resumo
The detection of very low gamma ray activities is a delicate task, and very important in environmental radiation
studies, for instance. It usually requires the use of low-background shielding, as the long counting times required
usually make the background subtraction quite tricky, and often result in rather high experimental uncertainties.
In this work a different approach is tested, where a two-detector gamma-gamma coincidence system is used
to eliminate essentially all of the background continuum - at the cost of reduced overall efficiency and, more
importantly, requiring that the radionuclide to be studied presents useful gamma-gamma coincidences. Two
distinct methods of analysis are tested, either using an "open-window" coincidence where an event is registered
whenever any event is registered in the other detector, or using a strict coincidence analysis, where a valid
coincidence between two gamma-rays from the same decay are required; this allow for a discussion on the
advantages and problems of each method, as well as for an experimental assessment of the performance of such
a system.
Como referenciar
ZAHN, GUILHERME S.; GENEZINI, FREDERICO A.; RIBEIRO JUNIOR, IBERE S.; FAGIONATO, ESNEL A. On the use of gamma-gamma coincidence to detect very low activities. In: BRAZILIAN MEETING ON NUCLEAR PHYSICS, 40th, September 3-7, 2017, Campos do Jordão, SP. Abstract... São Paulo, SP: Sociedade Brasileira de Física, 2017. p. 1-1. Disponível em: http://repositorio.ipen.br/handle/123456789/31186. 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.