1. THE INTERNATIONAL INTERCOMPARISON MEASUREMENT OF SOIL-GAS RADON AND RADON EXHALATION RATE FROM THE GROUND AND BUILDING MATERIALS. Authors: C. COSMA, M. MOLDOVAN, D. RISTOIU, T. JURCUT.2. RADIUM-226 MEASUREMENTS FROM UNDERGROUND WATERS IN DEJ AREA. Authors: M. MOLDOVAN, C. COSMA, D. RISTOIU.3. DOSE DISTRIBUTION IN THE IRRADIATION OF MEDULLOBLASTOMA WITH TWO ADJACENT FIELDS. Authors: C. CUDALBU, A. STAN, O. COZAR, D. RISTOIU.4. SEASON AND BUILDING MATERIAL INFLUENCE ON INDOOR RADON CONCENTARATION IN HOUSES FROM TRANSYLVANIA. Authors: C. COSMA, D. RISTOIU, C. CINDEA, STELA RÂMBOIU.