Total-skin electron beam (TSEB) irradiation is used to deliver a homogeneous dose distribution over the entire skin surface of a patient. TSEB dosimetry is quite complex as to the evaluation and measurement of absorbed dosage in the cutaneous region. This paper evaluates the performance of different dosimetric materials, using TL and OSL dosimetry, in the extremity-dose assessment of TSEB treatments using the six-dual-field technique and an anthropomorphic phantom. Dosimeters were selected with repeatability better than ±5.0% and calibrated to 6-MeV electron-beam dosimetry. Measurements were conducted in the abdominal region as a reference point and on the extremities. Results show expected deviations ranging up to 20% in the dose received in the extremities and good results in dose assessment using all dosimetric materials tested.
RESUMOO CaSO4:Dy é um material dosimétrico produzido nacionalmente, que apresenta alta sensibilidade, porém, uma alta dependência energética da resposta termoluminescente (TL) na região do efeito fotoelétrico. O objetivo deste trabalho é realizar um estudo comparativo da resposta TL do CaSO4:Dy quando irradiado com diferentes energias, na presença de placas de ácido polilático (PLA) impressas 3D e polimetilmetacrilato (PMMA). Os resultados obtidos indicam que o PLA apresenta uma diferença na atenuação da radiação, comparada ao PMMA, indicando que deve ser levada em consideração a qualidade da impressão empregada na confecção da placa a ser irradiada.Palavras-chave: Impressora 3D, Dosímetro termoluminescente, Dependência energética.
ABSTRACTThe CaSO4:Dy is a dosimetric material that is nationally produced, which presents high sensibility but a high energy dependence of its thermoluminescent (TL) response at the photoelectric effect region. This study aims to compare the TL response of the CaSO4:Dy when irradiated with different energies at the presence of 3D printed plates of polylactic acid (PLA) and polymethilmetacrylate (PMMA). Results show that the PLA presents different radiation attenuation when compared to PMMA, indicating that the quality of the print used on PLA plates manufacture should be taken into account.
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