Retrospective dosimetry is the method of using materials on or near a person who is exposed to ionizing radiation to determine the amount of radiation received by the person. A possible candidate material for retrospective dosimetry is Ivoclar Vivadent IPS e.max® CAD ceramic dental restoration material, which exhibits radiation-induced thermoluminescence when exposed to gamma- and x-ray radiation from a 137Cs source. The purpose of this paper is to characterize the material and study the behavior of the thermoluminescence signal with radiation dose and with delay time between radiation exposure and thermoluminescence measurement. The first glow peak is well-modeled by a first-order glow curve deconvolution formula. The height of the first glow peak is approximately linear with dose. The fading of the signal with time is approximately described by a power law curve with cutoff. The material appears to be suitable for retrospective radiation dosimetry.
1Department of Physics and Astronomy, Saint Cloud State University, 720 Fourth Avenue South, Saint Cloud, MN 56301;
2Department of Physics and Astronomy, Saint Cloud State University; present address Department of Orthopaedic Surgery, Johns Hopkins Hospital, Baltimore, MD 21287.
The authors declare no conflicts of interest.
For correspondence contact: Professor Steven T. Ratliff, Department of Physics and Astronomy, Wick Science Building Room 324, Saint Cloud State University, 720 Fourth Avenue South, Saint Cloud, MN 56301.
(Manuscript accepted 28 October 2017)