title: Application of concentrated TiO2 sols for gamma-ray radiation dosimetry.
abstract: Upon exposure to gamma-radiation, a concentrated TiO2 sol changes from colorless to deep blue with an absorption maximum at 540 nm. The absorption has been assigned to trapped electrons or Ti3+ states in the solid matrix based on its spectroscopic similarity to the samples irradiated with UV light. Unlike the conduction-band electrons generated from direct excitation by UV radiation, the origin of the trapped electrons during gamma-ray irradiation may be traced to a series of reducing species produced by the high energy electrons, which in turn, are the direct result of gamma-irradiation. As the absorption intensity is linearly related to the duration of exposure to gamma-radiation, it may have an application in gamma-ray dosimetry. The sensitivity of its dosage response has been found to be influenced by the semiconductor particle concentration and the dispersing solvent.
authors.affiliation: Department of Chemistry, Clarkson University, Potsdam, NY 13699, USA.
authors.forename: J
authors.initials: J
authors.lastname: Huang
authors.forename: M
authors.initials: M
authors.lastname: Wang
authors.forename: J
authors.initials: J
authors.lastname: Zhao
authors.forename: N
authors.initials: N
authors.lastname: Gao
authors.forename: Y
authors.initials: Y
authors.lastname: Li