Maybe related are 'criticality accidents', where by accident a critical mass is reached (either by bringing two masses of fissile material together, or by enclo

Maybe related are 'criticality accidents', where by accident a critical mass is reached (either by bringing two masses of fissile material together, or by enclosing a fissile mass by a neutron reflector), and someone gets a high dose of radiation, often with lethal result. See http://en.wikipedia.org/wiki/Criticality_accident http://en.wikipedia.org/wiki/Criticality_accident or http://www-pub.iaea.org/MTCD/publications/PDF/Pub1106_scr.pdf http://www-pub.iaea.org/MTCD/publications/PDF/Pub1106_scr.pd... for a report about the accident in Sarov, where a physicist lost his life.