Página 260 - irpa

260 ST 3.3 – Protección radiológica en medicina nuclear
DOSE RATE MEASUREMENT FOR I¹³¹ OUTPATIENT TREATMENT
Rodrigues Junior, Cláudio Lucindo*; Lopes Filho, Ferdinand de Jesus;
Lucena Barros, Juliana Patrícia Pereira; Aragão Filho, Geraldo de Lemos;
Moura Oliveira, Cláudia Florencio; Santana de Morais, Carolinne Santana;
Vanderlei Pinto, Alan Munis
Instituto Federal de Ciência Educação e Tecnologia. Brasil.
* Responsible author, email: claudio.rd.ifpe@gmail.com
Radioactive Iodine Therapy is a therapeutic procedure for the purpose to combat several
diseases affecting the thyroid, carrying out by the I¹³¹ or I¹²³ orally administration. The goal of
this study was to quantify and estimate if the exposure rate and the dose rate from Iodine (I¹³¹)
intake by the patient was at the appropriate level for release, according to the regulatory norm of
Brazilian Nuclear Medicine services, Comissão Nacional de Energia Nuclear (CNEN), at the
moment that patient is released after the use of the radionuclide activity below 1.85 GBq (50
mCi). To the search, patients who underwent this treatment in a Nuclear Medicine service were
evaluated. A digital Geiger-Muller counter was used as the measuring instrument. In order to
obtain measures about distances between the detector and the patient, they were fixes in 2m,
1m, 0,5m and directly in contact with the patient. Those measurements were performed in a free
area from radiation. The results showed a satisfactorily relation with the Brazilian norms,
referring to the release of the patient when therapeutic doses have been administered.