VICENTE DE PAULO DE CAMPOS

VICENTE DE PAULO DE CAMPOS

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Avaliacao do limite de repetitividade e de deteccao de dosimetros de CaSOsub(4):Dy
2004 - CAMPOS, V.P.; DOI, M.S.; MANZOLI, J.E.
Leaked filters for energetic an angular dependence corrections of thermoluminescent response
2007 - MANZOLI, JOSE E.; CAMPOS, VICENTE de P. de; SHAMMAS, GABRIEL I.J.
Environmental radiation free reference for thermoluminescence monitoring essay
2007 - MANZOLI, JOSE E.; CAMPOS, VICENTE de P. de
Selecionamento de detectores de radiacao segundo sua sensibilidade e viabilidade para dosimetria termoluminescente
2003 - MANZOLI, J.E.; CAMPOS, V.P.
Determination of radiation direction in environmental monitoring
2009 - CAMPOS, VICENTE de P. de; MOURA, EDUARDO S.; ROCHA, FELICIA D.G.; MANZOLI, JOSE E.
The assessment of environmental exposure has been performed in Brazil using the thermoluminescence technique at Thermoluminescence Dosimetry Laboratory (LDT), at Nuclear and Energetic Research Institute (IPEN/CNEN-SP). To carry out these measurements, several thermoluminscent dosimeters (TLD's) were used to measure the expose. In this procedure, very few information of direction where the radiation came from is available. A vague supposition about the direction from where the radiation came from could be inferred only by evaluation of multiple dosimeters displaced at entire region of monitoring, but this demand to much effort or sometimes become impractical for certain situations. In this work, a single device is used to provide information about the direction from where the radiation came through. This device is called directional dosimeter (DD)[1]. Using more than one DD it is possible to reduce the uncertainty of the measurements and determine the radiation source position. The DD basically consists of a regular solid with high effective atomic number, where one TLD is positioned at each face. The DD allows evaluating the environmental exposure and the direction of the radiation by a simple vector sum. At each face of the DD, it is associated an orthogonal vector, and modulus of this vector represents the correspond exposure measured by the TLD. The direction of the radiation source is the sum of these faces vectors. The prototype used in this work was a lead cube with six TLDs of CaSO4:Dy/Teflon. The TLDs have high sensibility and are already used in area, environmental and personal monitoring. The measurements had shown the correct environmental exposure and a good indication of the radiation direction.
Evaluation of reproductibility and detection limit of CaSOsub(4):Dy radiation detectorsemission spectrometry after wet partial digestion and neutron activation analysis
2006 - MANZOLI, JOSE E.; CAMPOS, VICENTE de P. de; DOI, MIRIAN S.
Measurement response of thermoluminescent dosimeter, TLD, used by workers or placed at positions where gamma radiation field could be in action affecting biological tissues, should be completely characterized, in order to achieve the radiation quantity with precision and confidence. Among the evaluations concerned to its characterization, the detector reproductibility is of fundamental importance, because detectors present inside the TLD will be used many times in routine. Reproductibility is studied by repeated exposure to the same radiation field. The minimum detection limit is another important characteristics of a TLD. In this work evaluations of reproductibility and minimum detection are presented, for dosimeters produced at IPEN.