Retrospective reconstruction of Iodine-131 distribution through the analysis of Iodine-129 Hiroyuki Matsuzaki, Yasuyuki Muramatsu, Takeshi Ohno and Wei Mao EPJ Web Conf., 153 (2017) 08014 Published online: 25 September 2017 DOI: 10.1051/epjconf/201715308014