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Göksu, H.Y.

Radiation safety and Individual dose assessment using personal objects .

Vortrag: 13 th International Conference on Engineering Nuclear Energy Systems, 3-8 June 2007, Istanbul, Turkey. (2007)
After radiation incidents , it is often found that there are not enough data or direct measurements available to describe or define the actual accident situation so as to assess the doses to which particular group of persons have been exposed. Radiation dose reconstruction is essential part of radiation risk assessment and for epidemiological studies, as well as for the correct treatment of individuals in acute cases of exposure. Furthermore, there is a growing concern in the public about accidental radiation exposures due to the ageing of the nuclear power industry, illegal dumping of nuclear waste, or terrorist activities which may result in health risks to individuals. In such events, in areas where radiation dose monitoring has not been performed, it is essential to be able to assess doses to individuals rapidly for immediate emergency medical care or for general estimation of the radiological consequences. Recent investigations have shown that certain types of SIM cards containing microchips have the potential to be used for retrospective dosimetry (Göksu 2003, Marthur 2006). It has been observed that a certain type of telephone chip-card can be used as radiation detectors for individuals exposed to external gamma doses. The radiation dose responses of more than 200 chip-cards, produced by various companies since 1990, were investigated using infrared stimulated luminescence (IRSL). The radiation dose responses of some of the chip-cards were found to be linear with radiation dose over 250 mGy to 5 Gy and stable at ambient temperature, which allows the use of such chip-cards for reconstruction of doses for individuals.  In order to determine the source of radiation induced signal, we have investigated the chip cards produced by INFINEON at various stage of production. The initial investigations show that radiation induced signal mainly come from the layer that is used for protection chip cards from the environmental effects.  In order to improve the radiation dose response and detection limits of the cards, various type of artificial phosphors are added to protecting layer of the chip cards The variation of the dose  response and the detection limit with respect to the amount and the type of the phosphor  is investigated using various luminescence techniques. Feasibility of production of such cards in industrial scale will be discussed.
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Publication type Other: Lecture
Conference Title 13 th International Conference on Engineering Nuclear Energy Systems
Conference Date 3-8 June 2007
Conference Location Istanbul, Turkey
Institute(s) Institute of Radiation Protection (ISS)