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Authors:
M.T. Rézio, M.R. Vieira and A.R. Roda
Abstract:
The Nuclear Medicine Department of the Portuguese Institute of Oncology in Lisboa (IPOFG-CROL, SA) has recently acquired a new type of equipment for workplace monitoring: TAM radiation meter system (Tema Sinergy, Italy). It consists of a Geiger-Müller detector with a dose rate range between 0,1 µSv.h-1 to 0,02 Sv.h-1 and sensitive to energies between 50 keV to 1 MeV.
Eight detectors were installed in the most important areas of our department, namely, radiopharmacy, waiting room for accompanying persons, waiting room of injected patients (at two points), room of injected patients, PET radiopharmacy, PET commands room, and waiting room of PET injected patients. The dose rate measured by the equipment is collected on a computer on a 24-hour basis. The system allows an online visualization of the measurements as well as the storage on a database for evaluation. In this work the data collected with this equipment is analysed. The system give us the dose rate average, for example, in the PET commands room (0,186 uSv.h-1) and in the PET radiopharmacy (0,240 uSv.h-1). The results show that the dose rate limits established by law for this type of installations (0,4 mSv.week-1 for professionally exposed workers and 0,02 mSv.week-1 for the general public) are not exceeded. The aim of this work is to demonstrate there are presently good radiation protection conditions at our Department.
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