Bonn 2020 – scientific programme
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ST: Fachverband Strahlen- und Medizinphysik
ST 3: Radiation monitoring and dosimetry II
ST 3.1: Talk
Wednesday, April 1, 2020, 11:00–11:15, H-HS II
TL-DOS dose estimation study considering pre- and post-irradiation fading — •Hannah Jansen1, Kevin Kröninger1, Florian Mentzel1, Jens Weingarten1, and Jörg Walbersloh2 — 1TU Dortmund — 2Materialprüfungsamt NRW
The sliding film dosimeters currently used for personal dosimetry have to be replaced soon, because they do not meet the legal requirements for a renewal of their type approval any more. The TL-DOS dosimetry system will replace them in the western part of Germany. TL-DOS is developed by the Materialprüfungsamt NRW and the TU Dortmund. It is based on thermoluminescence using LiF:Mg, Ti. Ionizing radiation excites electrons so that electrons and holes get captured in local energy states (traps). They get released by heating the detector and recombine. The number of recombination photons is proportional to the deposited dose. The so-called glow curve is a plot of the number of photons as function of detector temperature. The glow curve is mainly affected by two processes: the pre- and the post-irradiation fading. Electron and hole traps change their configuration over time which is called pre-irradiation fading. Additionally, the electron release already starts at room temperature which causes a time-dependent photon number. This is the post-irradiation fading. A better understanding of their effect on the glow curve is necessary to draw more precise conclusions about the irradiation circumstances such as the irradiation date. In this talk, I will present results of a measurement program varying pre- and post-irradiation fading times and radiation dose.