“…One reason may relate to the long half-life (15.7 million years) of the isotope that makes it a low-radioactive risk. Some studies have, however, indicated an enhanced accumulation of the isotope in animal and human organs (Handl et al, 1990;Handl, 1996;Hou et al, 2000Hou et al, , 2003aFréchou et al, 2002), which call for a more comprehensive evaluation of the impact of 129 I on the environment and human health.…”