“…Part 2 was on "Epidemiology: Updates on epidemiological low dose studies", co-chaired by Cato M. Milder and Mark P. Little (Milder et al 2021). This second Bill Morgan Special Issue consists of two meeting reports (Laiakis et al 2021;Milder et al 2021), four review articles highlighted from recorded presentations in parts 1 and 2 (Chauhan et al 2021b;Kendall et al 2021;Little et al 2021;Paunesku et al 2021), three original articles (Chauhan et al 2021a;Golden et al 2021;Karpov et al 2021) and one review article (Preston et al 2021). give an overview of NCRP Report No.…”