One major objective of this work is to experimentally estimate the following kinetic parameters on the IPEN/MB-01 research reactor at São Paulo: the effective neutron delayed fraction, betaeff, the prompt neutron generation time, lambda, and the ratio betaeff/ lambda. In order to achieve our goal, we will use a microscopic noise technique called Rossi-alpha method. This method is based on the statistical nature of the fission-chain process. Using a coincidence acquisition system, the rationale is to experimentally determine the probability distribution of detecting neutrons from the same chain. Through a least-squares fit of this distribution we estimate the prompt neutron decay constant alpha = (betaeff-rho)/lambda. The alpha parameter will be measured for three sub-critical levels using three different source configurations, and the ratio betaeff/ lambda is obtained via a extrapolation to rho = 0. A specific acquisition system for Rossi-alpha measurements has been developed in order to achieve our objective. This system is based on a multichannel scaler controlled by virtual instruments that records the timing of all neutron events, allowing data analysis during the acquisition. The first measurements were performed using two BF3 detectors positioned at the center of IPEN/MB-01 reactor core. In the future the same measurements described above will be performed using ³He and photodiode detectors. The photodiode detectors have been developed by the Reactor Physics Division of IPEN. In this work we will present a preliminary set of Rossi-alpha measurements performed on the IPEN/MB-01 research reactor at São Paulo.

A summary of the world status on R&D related to the utilization of Accelerator Driven System (ADS) for energy generation and mainly for transmutation of long lived nuclear waste is presented. A proposal to start a TechnicalWorking Group (TWG) in Brazil to prepare a Road Map having as a final goal an experimental facility to utilize an accelerator in basic and applied research; products and services and R&D in energy generation and transmutation are presented.

Este trabalho relata um caso clínico de carcinoma escamo celular cutâneo em um cão da raça Weimaraner, fêmea, 8 anos de idade tratado utilizando-se braquiterapia com folhas de Ouro-198. Os objetivos deste relato foram: avaliar o uso de um molde radioativo confeccionado para uso veterinário e sua eficácia no tratamento de um tumor de pele em cão. O método demonstrou ser eficaz no tratamento do tumor, mostrou ser uma prática segura para a equipe profissional envolvida, com baixos custos e resultado radiobiológico superior quando comparado com o tratamento padrão utilizado com outros elementos radioativos.

This study showed a skin squamous cell carcinoma clinical case from 8-years-old female weimaranner, treated by gold-198 foil brachytherapy. The aims were to evaluate special radioactive mould performed to be used on Veterinary practioners and, it's efficiency on one case of skin tumor treatment in dog. The method showed efficacy on the skin tumor treatment and radiological protection especially for the professional team involved, low cost and better radiobiological results when it was compared with standard treatment using others radioactive elements.