Characterization of OSL dosimeters for use in dose assessment in Computed Tomography procedures

Autor(es)

Giansante, Louise ^[1] ; Santos, Josilene C. ^[1] ; Umisedo, Nancy K. ^[1] ; Terini, Ricardo A. ^[1] ; Costa, Paulo R. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Phys, Nucl Phys Dept, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: PHYSICA MEDICA-EUROPEAN JOURNAL OF MEDICAL PHYSICS; v. 47, p. 16-22, MAR 2018.
• Citações Web of Science: 2

Resumo

This study describes the characterization of an Al2O3:C OSLD (Landauer's Luxel T tape) for dose evaluation in Computed Tomography. The irradiations were conducted using both a constant potential X-ray equipment and a 64-slice clinical CT scanner, and the readouts were performed using a Riso TL/OSL reader. The following aspects were studied: batch homogeneity, energy response, linearity of dose response, reproducibility, reusability, and effect of uncertainties with the normalization of OSL signals per their response to beta radiation. A group of 330 dosimeters from the 452 irradiated with the same dose presented OSL signals within the interval of 4.7% from the average. The dosimeters presented energy-dependent response in good agreement with results found in the literature. The air kerma response of the OSL signal showed a linear trend for both the constant potential X-ray device and the clinical CT scanner, with differences in their slopes of approximately 10%. Reproducibility, reusability, and effect of beta normalization were analyzed by separating 72 dosimeters in 3 groups. The results obtained in this study together with those of previous works indicate that this type of dosimeter is adequate for dose evaluation in CT clinical applications. (AU)

• Processo FAPESP: 08/57863-2 - P&D em metrologia das radiações
• Beneficiário: Linda Viola Ehlin Caldas
• Modalidade de apoio: Auxílio à Pesquisa - Temático