Modelo quantitativo de avaliação da contribuição de cada fonte radioativa na dose individual externa Hx em trabalhador de serviço de medicina nuclear

Abstract

Assess whether the activities performed in the Nuclear Medicine service are significant in the total dose received by the workers and their relative contributions. Methods: measured independent variables: number of scintigraphies remaining in the examination room (N); eluted activity (E); Total activity marked in pharmaceuticals kits (K); number of times that was scheduled to work in the Hot room (Q); Variable dependent measured: cumulative effective dose in the period 10/2012 to 04/2013 added to each worker, obtained by information registered daily and monthly on activities and doses received in the period. Held Multiple Linear Regression (D = a + β_1 N + E + β_2 β_3 K + β_4 Q) with α = 0.05 significance level. It was concluded that the independent variables N (p = 0.097) and E (p = 0.086) did not significantly interfere with the Cumulative dose in the period. The K variables (p = 0.017) and Q (p = 0.028) were significant in the proposed model.

Radiometric survey on the exposure to and management of radioactive waste produced by patients on I131 treatment

“…There has been no record for physicists in the last three years. In fact, these professionals do not routinely stay in the hot room, as reported by Oliveira (2016) in their research, which shows that the longer the stay, the higher the radiation dose received, which is the largest dose contribution factor ever accumulated.…”

“…One of the reasons to justify why this professional received the highest dose of radiation is that he did most of the routine work in the clinic with the use of unsealed sources, such as elution of the 99mTc generator, preparation of the radiopharmaceutical kits, adding the drug to the radioactive material to be administered to the patients, and positioning the patient already administered with radioactive material for image generation. According to a study by Oliveira (2016), the length of time in the preparation room, known as the hot room, also tends to increase the accumulated dose, since this room is one of the sites with the highest radiometric levels.…”

“…Workers in direct contact with the waste and the patients on iodine treatment are more susceptible to radiological exposure (OLIVEIRA et al, 2016). For this reason, it is necessary to quantify the doses in order to control the radiation exposure to workers.…”