Authors: M. Reitzig, T. Härtling, M. Winkler, P.E. Powers, S. Derenko, O. Röder, J. Opitz
Affilation: Fraunhofer Institute for Nondestructive Testing IZFP, Dresden Branch, Germany
Pages: 119 - 122
Keywords: wterilization, medical products, optical monitoring, luminescence, up-conversion
We present recent investigations on time-resolved measurements on alterations in the temporal luminescence decay of up-conversion phosphors induced by electron beam treatment. As a consequence of the tight regulations concerning sterility in the food and medical sectors a reliable and nondestructive in situ evaluation of the sterilization process faces a huge demand. Our technique is based on placing a suitable marker material (based on rare-earth phosphors) inside or as a coating on the packaging material. Upon electron irradiation the marker material changes its luminescent properties as a function of applied energy dose. The energy dependence is verified by time-resolved measurements on different up-conversion materials.