Non-destructive assay of nuclear materials using a self-indication method Jun-ichi Hori, Tadafumi Sano, Yoshiyuki Takahashi, Jaehong Lee, Hironobu Unesaki and Ken Nakajima EPJ Web Conf., 146 (2017) 09042 Published online: 13 September 2017 DOI: 10.1051/epjconf/201714609042