Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) TAKAHASHI Haruo and MATSUMOTO Kazuyasu and SATO Jun,Radon Degassing Efficiency of Pyroclastic Material from Unzen Volcano,BULLETIN OF THE VOLCANOLOGICAL SOCIETY OF JAPAN,04534360,The Volcanological Society of Japan,1993,38,4,135-137,https://cir.nii.ac.jp/crid/1390001204303869568,https://doi.org/10.18940/kazan.38.4_135