Memory effects and systematic errors in the RL signal from fiber coupled Al2O3:C for medical dosimetry

Sidsel Marie Skov Damkjær, Claus Erik Andersen

    Research output: Contribution to journalConference articleResearchpeer-review

    Abstract

    This review describes 40 years of experience gained at Risø The radioluminescence (RL) signal from fiber coupled Al2O3:C can be used for real-time in vivo dosimetry during radiotherapy. RL generally provides measurements with a reproducibility of 2% (one standard deviation). However, we have observed a non-random variability of the RL signal which means that the memory of the system is not fully reset by the optically stimulated luminescence (OSL) readout. Here we report an example of how this memory affects the RL signal. Measurements were performed in the range of 0–4 Gy using four Al2O3:C crystals, in cycles of irradiation and subsequent readout. We found the memory to be persistent, influencing several successive RL measurements. The induced systematic error was found to be crystal dependent, but proportional to the measurement-to-measurement dose variation (approximately 1.4% per Gy).
    Original languageEnglish
    JournalRadiation Measurements
    Volume45
    Issue number3-6
    Pages (from-to)671-673
    ISSN1350-4487
    DOIs
    Publication statusPublished - 2010
    Event7th European Conference on Luminescent Detectors and Transformers of Ionizing Radiation - Kraków, Poland
    Duration: 12 Jul 200917 Jul 2009
    Conference number: 7

    Conference

    Conference7th European Conference on Luminescent Detectors and Transformers of Ionizing Radiation
    Number7
    CountryPoland
    CityKraków
    Period12/07/200917/07/2009

    Keywords

    • Radiation research and nuclear technologies
    • Radiation physics

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