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Radiation Protection Dosimetry 66:111-112 (1996)
© 1996 Oxford University Press

A New TL Finger Ring Dosimetry System with Automated Ring Identification

K.E. Duftschmid, M. Majevski, E. Michler and R.A. Tawil

TL finger ring dosemeters, particularly if used during surgery, etc., have to be small, convenient to wear and suitable for cold sterilisation. This makes automated ring identification difficult to achieve. A new approach is described, based on a circular TLD chip mounted with Kapton foil on a small aluminium disc containing a miniaturised circular bar code (radial 6 digit ITF) and a six digit number. The ring is inserted into a disposable plastic finger ring and protected by a circular cover plate. This ring design is convenient to wear, fits all finger sizes and can be cold sterilised for multiple use in surgery. For readout the ring is opened by a semi-automated device an up to four bar coded discs inserted into a modified standard TLD card for automatic processing by Harshaw readers models 6600 or 8800. The reader contains a video bar code identification system based on a miniaturised CCD camera and image processing by special PC software. The circular bar codes are mathematically linearised and decoded directly from the enhanced grey scale picture obtained with optimised illumination by power LEDs. The system described (Patent No. A 398005/1994) is a fast and economic solution for fully (or semi-) automated evaluation of TLD finger rings in larger personnel monitoring services.


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