title: Thermoluminescent characteristics of LiF:Mg, Cu, P and CaSO4:Dy for low dose measurement.
abstract: Thermoluminescence (TL) characteristics for LiF:Mg, Cu, P, and CaSO4:Dy under the homogeneous field of X-ray beams of diagnostic irradiation and its verification using thermoluminescence dosimetry are presented. The irradiation were performed utilizing a conventional X-ray equipment installed at the Hospital Juárez Norte of México. Different thermoluminescence characteristics of two material were studied, such as batch homogeneity, glow curve, linearity, detection threshold, reproducibility, relative sensitivity and fading. Materials were calibrated in terms of absorbed dose to the standard calibration distance and they were positioned in a generic phantom. The dose analysis, verification and comparison with the measurements obtained by the TLD-100 were performed. Results indicate that the dosimetric peak appears at 202°C and 277.5°C for LiF:Mg, Cu, P and CaSO4:Dy, respectively. TL response as a function of X-ray dose showed a linearity behavior in the very low dose range for all materials. However, the TLD-100 is not accurate for measurements below 4mGy. CaSO4:Dy is 80% more sensitive than TLD-100 and it show the lowest detection threshold, whereas LiF:Mg, Cu, P is 60% more sensitive than TLD-100. All materials showed very good repeatability. Fading for a period of one month at room temperature showed low fading LiF:Mg, Cu, P, medium and high for TLD-100 and CaSO4:Dy. The results suggest that CaSO4:Dy and LiF:Mg, Cu, P are suitable for measurements at low doses used in radiodiagnostic.
authors.affiliation: CICATA - Legaria del Instituto Politécnico Nacional, 11500 México, D.F., Mexico. Electronic address: susi2489@hotmail.com.
authors.forename: S
authors.initials: S
authors.lastname: Del Sol Fernández
authors.affiliation: CICATA - Legaria del Instituto Politécnico Nacional, 11500 México, D.F., Mexico.
authors.forename: R
authors.initials: R
authors.lastname: García-Salcedo
authors.affiliation: CICATA - Legaria del Instituto Politécnico Nacional, 11500 México, D.F., Mexico.
authors.forename: J Guzmán
authors.initials: JG
authors.lastname: Mendoza
authors.affiliation: CICATA - Legaria del Instituto Politécnico Nacional, 11500 México, D.F., Mexico.
authors.forename: D
authors.initials: D
authors.lastname: Sánchez-Guzmán
authors.affiliation: Hospital Juárez de México, 07760 México, D.F., Mexico.
authors.forename: G Ramírez
authors.initials: GR
authors.lastname: Rodríguez
authors.affiliation: Universidad Autónoma Metropolitana-Xochimilco, 04960 México, D.F., Mexico.
authors.forename: E
authors.initials: E
authors.lastname: Gaona
authors.affiliation: CICATA - Legaria del Instituto Politécnico Nacional, 11500 México, D.F., Mexico.
authors.forename: T Rivera
authors.initials: TR
authors.lastname: Montalvo
keywords: Dosimetry; Low dose X-ray; Radiodiagnostic; Thermoluminescent materials