Dortmund 2021 – wissenschaftliches Programm

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ST: Fachverband Strahlen- und Medizinphysik

ST 10: Radiation Monitoring and Dosimetry

ST 10.1: Vortrag

Donnerstag, 18. März 2021, 14:00–14:15, STa

Glowcurve simulation using rate equations — •Alexander Schneider, Evelin Derugin, Florian Mentzel, Jens Weingarten, and Kevin Kröninger — TU Dortmund, Lehrstuhl für Experimentelle Physik IV

Due to the expiration of the design license of film dosemeters in 2025 thermoluminescence based dosemeters (TLD) will come into operation in large quantities. Measurement of doses of ionizing radiation with these TLD is based mainly on empirical data, an extensive model describing the physical behavior involved in the measuring process is missing.

Charge carriers that are exited from their ground state by ionizing radiation can - in TLD materials - be trapped in metastable states. Heating a radiated TLD material then releases the trapped charge carriers which subsequently recombine, partially in a luminescent process. The relation of temperature and the resulting thermoluminescence intensity for a given dose is well known in a quantitative sense and the absorbed dose can be derived from the glowcurve.

This talk will discuss models describing the physics behind the readout process and the difficulties involved in their development. Rate equations describing the movement of charge carriers are used as a basis for creating artificial glowcurves but immediately introduce the difficulty of finding correct parameter values. The data driven approach towards usable parameter values and a better understanding of the underlying physics can be done with several tools, including statistical analysis and machine learning techniques.