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The Dosimetry School - Course Instructors

Dr. rer. nat. Dipl.-Phys. Holger Georg

  • Studied Physics at Justus-Liebig-Universität Gießen, Trent University Peterborough (CA) and Albert-Ludwigs-Universität Freiburg. In 1999 he received his PhD from Albert-Ludwigs-Universität Freiburg. Dr. Georg has been working two years  as a software developer.
    In 2001, Dr. Georg became head of the PTW radiological calibration laboratory.

Dipl. Ing. Jens-Thomas Jobs

  • studied Biomedical Engineering at Chemnitz University of Technology, followed by an education as Medical Physicist  (University of Kaiserslautern). In 1992, he joined the International Sales Team at PTW being responsible for sales areas in Germany, Mediterranean and Middle East and the Americas.
    Since 2003, Calibration Facility Sales & Project Manager, responsible for order acquisition, contracting processing and fulfillment.

Dr. rer. nat. Dipl.-Phys. Ralf-Peter Kapsch

  • Study of Physics and dissertation at Halle University, PostDoc at Max Planck Institute for Physics of Complex Systems in Dresden.
    Since 2000 research associate at the department "Dosimetry for radiation therapy and diagnostic radiology" at the National Metrology Institute of Germany (PTB), since 2004 head of the PTB research group "High energy photon and electron radiation".
    Since 2002 leading contribution at the German Institute for Standardization (DIN).
    Since 2001 expert at the German Accreditation Body (DAkkS) for dosimetric measurement quantities, since 2004 external consultant of the IAEA for the dosimetry of high energy photon and electron radiation.

Dr. Stefan Pojtinger

  • Dr. Stefan Pojtinger is the head of the working group “Dosimetry for diagnostic radiology” at the German national metrology institute PTB. The working group is responsible for the realization and dissemination of the unit gray for x- and gamma radiation qualities. Thereby the group creates the metrological basis for the dosimetry in radiation protection as well as in medical x-ray diagnostics and x-ray therapy. Key tasks are calibrations for SSDLs, type testing, certification and consulting. The focus in research and development is the improvement of the primary standards and the dosimetry for medical x-ray diagnostics including mammography and computed tomography. Dr. Stefan Pojtinger is also member of IEC TC62 WG 3 which is responsible for IEC 61627 and IEC 61674 and is currently involved in a IAEA CRP research project which aims to lay the foundation for the revision of IAEA TRS 457.

Dr. Damian Twerenbold

  • Physics Doctorate at the Eidgenössische Technische Hochschule Zürich in 1986 on X-Ray detector development. Postdoc at CERN and European Space Agency (1986-1991). Technology Manager for X-ray tube manufacturing at Comet AG (1991-1994) and founder and CEO of startup company GenSpec SA in bioanalytical instrumentation (1994-2005). In 2005 joined the Swiss National Metrology Institute METAS as Head of Section Thermometry and Ionizing Radiation. Member of the Consultative Committee for Ionizing Radiation (CCRI) at the International Bureau of Weights and Measures (BIPM) in Paris and EURAMET Technical Committee for Ionizing Radiation. Member of various ISO and IEC Technical Committee committees. Since 2014 Technical Assessor ISO 17025, ISO 17020, and ISO 17043 for the Swiss Accreditation Body (SAS), the German Accreditation Body (DAkkS) and the Dutch Accreditation Council (RvA). Retired from METAS in 2020.
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