Raul Mainardi is Full Professor of Physics at the University of Cordoba and Research Fellow of the National Research Council, both institutions from Argentina. He received a PhD from the University of Maryland (USA) and returned to his home country. Since 1975 he has been doing basic and applied research in x-ray spectrometry in topics such as x-ray fluorescence, bone densitometry, x-ray cross section measurements, x-ray spectral determination and its dosimetry and inverse Compton scattering studies for the production of x-rays and gamma ray intense beams. He has been intensely engaged in teaching and advising graduate and undergraduate students, many of them currently involved in medical physics work at health centers throughout his country.

R. Mainardi: x-ray spectral determination, x-ray dosimetry, x-ray cross section measurements, characteristic radiation emission by beta particle excitation, Inverse Compton scattering.

Roger Schibli is an Associate Professor at the ETH Zurich and the scientific deputy head of the Center for Radiopharmaceutical Science at the Paul Scherrer Institute Villigen (PSI), Switzerland. He graduated from the University of Basel Switzerland in November 1996. He spent two years at the University of Missouri-Columbia, MO as a post-doctoral fellow. Prof. Schibli's research activities focus on the development of new radiometal labeling strategies of biomolecules for targeted diagnosis and therapy of cancerous diseases. He is one of the co-inventor of the technetium- and rhenium-tricarbonyl technology (IsoLink®). Furthermore, his work emphasizes on the biological and pharmacological characterization and optimization of the radioactive compounds in vitro and in vivo. Medically relevant radionuclides for pre-clinical and clinical studies are produced at the large research facilities of the Paul Scherrer Institute under the direction of Prof. Schibli.

S.C. Roy was Professor and Chairman of the Department of Physics, Bose institute, Kolkata, India. He is currently the visiting professor at the University of Calcutta and the Editor-in-Chief of a reputed Indian journal Science and Culture.

Roy did his Ph.D. degree from the University of Calcutta on experimental investigations on elastic scattering of gamma rays and was Research Associate at the University of Pittsburgh, USA and at Yale University, USA. In Pittsburgh he was associated with the theoretical investigations on elastic and inelastic (Compton) scattering of x-rays and gamma rays. He was involved in developing most precise state-of-the-art estimation of elastic scattering cross sections of gamma rays. While he was at Yale University he was involved in radiation detector involvement and was instrumental in developing a new kind of neutron detector ‘superheated drop detector’ which was now included in the graduate student text book on radiation detector by G.F. Knoll (3rd edition).

Roy was Visiting Professor at Tom Baker Cancer Centre of University of Calgary, Canada and worked on medical physics using superheated drop detector. During this period he had been able to determine the neutron dose received by the fetus when a pregnant woman is irradiated by high energy x-rays at the chest. He was also a visiting Professor at Purdue University, USA and was involved to determine the neutron dose in proton therapy.