title: Formaldehyde increases MAGIC gel dosimeter melting point and sensitivity.
abstract: Polymeric gel dosimeters are being used to verify three-dimensional (3D) dose distributions of different types of radiotherapy treatments, especially the most complexes ones. An important factor that can limit the wider use of this kind of dosimeter is temperature, as gel melting can destroy 3D information. This work shows that adding formaldehyde to the gel preparation increases the melting point, allowing its use in warmer environments, including up to body temperature. An addition of 3% in mass of the formaldehyde solution to a MAGIC type gel dosimeter increased its melting point from 25 to 69 degrees C. Also important were a 12.5% increase in gel sensitivity and an expressive decrease in relaxation rate R2 uncertainty.
authors.affiliation: Departamento de Fisica e Matematica, FFCLRP, Universidade de São Paulo, Av Bandeirantes, Ribeirao Preto, SP, Brazil.
authors.forename: Juliana Polezze
authors.initials: JP
authors.lastname: Fernandes
authors.forename: Bruno Fraccini
authors.initials: BF
authors.lastname: Pastorello
authors.forename: Draulio Barros
authors.initials: DB
authors.lastname: de Araujo
authors.forename: Oswaldo
authors.initials: O
authors.lastname: Baffa
mesh_terms: D001205:Ascorbic Acid / Q000737:chemistry*; D019327:Copper Sulfate / Q000737:chemistry*; D005557:Formaldehyde / Q000737:chemistry*; D005780:Gelatin / Q000737:chemistry*; D006873:Hydroquinones / Q000737:chemistry*; D008689:Methacrylates / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D011829:Radiation Dosage; D012680:Sensitivity and Specificity; D044366:Transition Temperature
chemical_list: D006873:Hydroquinones; C476159:MAGIC polymer gel; D008689:Methacrylates; D011108:Polymers; D005557:Formaldehyde; D005780:Gelatin; D019327:Copper Sulfate; D001205:Ascorbic Acid