1. PARALLEL RADON AND THORON SURVEY AT SPECIAL UNDERGROUND CIRCUMSTANCES. Authors: GÁBOR SZEILER, TAMÁS VIGH, JÁNOS SOMLAI, CSABA NÉMETH, NORBERT KÁVÁSI, TIBOR KOVÁCS.2. RADON AND RADON EXPOSURE OF WORKERS IN HUNGARIAN SHOW CAVES. Authors: TIBOR KOVÁCS, ANDRÁS VÁRHEGYI, GÁBOR SZEILER, JÓZSEF HAKL, NORBERT KÁVÁSI, JÁNOS SOMLAI.