title: Ambient radiation levels in positron emission tomography/computed tomography (PET/CT) imaging center.
abstract: OBJECTIVE
  To evaluate the level of ambient radiation in a PET/CT center.
  
  
  METHODS
  Previously selected and calibrated TLD-100H thermoluminescent dosimeters were utilized to measure room radiation levels. During 32 days, the detectors were placed in several strategically selected points inside the PET/CT center and in adjacent buildings. After the exposure period the dosimeters were collected and processed to determine the radiation level.
  
  
  RESULTS
  In none of the points selected for measurements the values exceeded the radiation dose threshold for controlled area (5 mSv/year) or free area (0.5 mSv/year) as recommended by the Brazilian regulations.
  
  
  CONCLUSIONS
  In the present study the authors demonstrated that the whole shielding system is appropriate and, consequently, the workers are exposed to doses below the threshold established by Brazilian standards, provided the radiation protection standards are followed.
authors: PhDs, Associate Professors, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG, Brazil.
authors: Priscila do Carmo
authors: Pdo C
authors: Santana
authors: PhDs, Associate Professors, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG, Brazil.
authors: Paulo Marcio Campos
authors: PM
authors: de Oliveira
authors: PhD, Full Professor, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG, Brazil.
authors: Marcelo
authors: M
authors: Mamede
authors: Graduate Students, Course of Technology in Radiology, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG, Brazil.
authors: Mariana de Castro
authors: Mde C
authors: Silveira
authors: Graduate Students, Course of Technology in Radiology, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG, Brazil.
authors: Polyanna
authors: P
authors: Aguiar
authors: Graduate Students, Course of Technology in Radiology, Universidade Federal de Minas Gerais (UFMG), Belo Horizonte, MG, Brazil.
authors: Raphaela Vila
authors: RV
authors: Real
authors: PhD, Titular Researcher at Centro de Desenvolvimento da Tecnologia Nuclear - Comissão Nacional de Energia Nuclear (CDTN/CNEN), Belo Horizonte, MG, Brazil.
authors: Teógenes Augusto
authors: TA
authors: da Silva
keywords: Dosimetry; PET/CT; Thermoluminescence dosimetry