external exposure facility Low dose and low dose rate facility for cells R. Yentrapalli et al., Proteomics, 13 (2013) 1096-1107 This cell irradiation facility at Stockholm University delivers controlled low-dose and low-dose-rate gamma exposures for in vitro radiobiology studies. Research using the facility has demonstrated induction of premature senescence in human endothelial cells following chronic low-dose-rate gamma irradiation, with proteomic analysis revealing key mechanistic pathways. It is particularly suited to experiments requiring prolonged, low-intensity exposures that mimic occupational or environmental radiation scenarios. Located at Stockholm University. Paul Schofield