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Nondestructive testing of electron beam sterilization by means of an optically active marker material

: Härtling, T.; Reitzig, M.; Mayer, A.; Wetzel, C.; Röder, O.; Schreiber, J.; Opitz, J.


Jiang, S. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Optical components and materials IX : 25 - 26 January 2012, San Francisco, California
Bellingham, WA: SPIE, 2012 (Proceedings of SPIE 8257)
ISBN: 978-0-8194-8900-5
Paper 825713
Conference "Optical Components and Materials" <9, 2012, San Francisco/Calif.>
Fraunhofer IZFP, Institutsteil Dresden ( IKTS-MD) ()

Secure proof of sterilization processes on packaging materials is an important issue in many economic sectors. In this context, electron beam sterilization is a highly effective low temperature technique. However, verifying the application of a sufficient electron dose is still difficult - especially on products with complex geometry. Here we report on an optical, hence fast and contactless approach which gives reliable evidence of a successful e-beam treatment. The technique is based on placing a suitable marker material (rare-earth based particles) inside or as a coating on the packaging material. By electron irradiation these particles change their optical properties and thus indicate the successful application of the electron beam.