in experiments where mouse embryo cells ( c3h 10t1/2 ) were irradiated with a parallel beam of 5.6 mev alpha particles from a tandem van de graaff machine , we made the surprising discovery that about 10 to 20 alpha particles through each nucleus were required to kill 2/3 of the cells ( lloyd 1979a ) .
C0007610
nucleus
C0007634
cells