D’ERRICO, FRANCESCOJUNOT, DANILO O.POLO, IVON O.CHIERICI, ANDREACIOLINI, RICCARDOSOUZA, DIVANIZIA N.CALDAS, LINDA V. E.SOUZA, SUSANA O.2020-01-142020-01-14D’ERRICO, FRANCESCO; JUNOT, DANILO O.; POLO, IVON O.; CHIERICI, ANDREA; CIOLINI, RICCARDO; SOUZA, DIVANIZIA N.; CALDAS, LINDA V. E.; SOUZA, SUSANA O. Differential-fading optically stimulable materials for nuclear safeguards. In: INTERNATIONAL NUCLEAR ATLANTIC CONFERENCE, October 21-25, 2019, Santos, SP. <b>Proceedings...</b> Rio de Janeiro: Associação Brasileira de Energia Nuclear, 2019. p. 3838-3843. Disponível em: http://repositorio.ipen.br/handle/123456789/30684.http://repositorio.ipen.br/handle/123456789/30684Safeguards agencies are concerned with the safety of nuclear installations and the security of nuclear materials. Material protection, control, and accountancy are the first steps towards maintaining continuity of knowledge of these materials and preventing illicit trafficking or diversion of these materials for illicit purposes. Related concerns also exist in arms control, where the item chain of custody is important. In order to strengthen and improve the efficiency and effectiveness of existing safeguards measures, tamperproof devices and materials are needed capable of determining elapsed time since the undeclared movement of a source. Our group developed a new approach for surveillance based on passive, solid-state devices. Relying on a non-electronic detection mechanism is highly desirable because complex electronic components and circuits are potentially vulnerable to tampering and snooping. The device is a set of passive optically stimulated luminescent detectors based on calcium sulfate doped with various rare earths. The different doping produces different temporal fading profiles. When a source causes energy deposition in the detectors, the latter accumulate trapped electrons that undergo de-trapping at different rates. Thus, reading them out produces a set of signals that correlates both with the strength of the source and with the time of its passage.3838-3843openAccesscalcium sulfatesdoped materialsradiation detectorsradioactive materialsrare earthssafeguardssecuritythermoluminescent dosemetersTexto completo de evento0000-0002-7362-2455https://orcid.org/0000-0002-7362-2455