Two laboratories, for thin films and polymer investigations operate for many years. Fruitful scientific collaboration with the Joint Institute for Nuclear Research, Dubna, Russia, has been maintained since 1962, as well as many others with the University of Bonn, Germany; the Center for Nuclear Reasearch, Saclay, France; Fermilab, Batavia, USA; the Technological University of Aachen, Germany; the Institute for Nuclear Physics, Juelich; the Polytechnik of Lodz, Poland; Friedrich-Schiller-Universitat-Jena, Germany University of Martin-Luther "Halle-Wittenberg", Germany; University of the Federal Armed Forced Munich, Germany; University of Minho, Portugal; Wroclaw Universitry of Technology, Poland; Aristotle University of Thessaloniki, Greece; Mahatma Gandy University, India; Ecole Polytechnique Federale de Lausanne, Suisse; University of Odense, Denmark.