Harald BUEKER,¹ Friedrich W. HAESING,¹ Frank PFEIFFER¹ and Hermann-Joseph SCHMITZ²

¹ Forschungszentrum JEich GmbH, ZEL-EGS, D-52425 JEich, Germany, ² ProCom GmbH, D-52021 Aachen, Germany

(Received July 2, 1996; Accepted September 9, 1996)

The developed fiber-optic twin sensor allows in-vivo dose measurement in the tissue of the patient's body. It consists of two radiation-sensitive fibers. The radiation-induced attenuations of these fibers are used to determine the dose absorbed in tissue. The two signals have a linear dose response, but they depend differently on the energy of the ionizing radiation. Evaluation of the two sensor signals permits a nearly tissue-equivalent dose indication.

Key words : fiber-optic sensors, dose measurement, ionizing radiation, in-vivo dosimetry, in-vivo sensors, radiation therapy