what was the source of alpha particles in rutherford's experiment
Rutherford scattering The initial discovery was made by Hans Geiger and Ernest Marsden in 1909 when they performed the gold foil experiment in collaboration with Rutherford, in which they fired a beam of alpha particles (helium nuclei) at foils of gold leaf only a few atoms thick. At the time of the experiment, the atom was thought to be analogous to a plum pudding (as proposed by J. J. Thomson), with the negatively-charged electrons (the plums) studded throughout a positive spherical matrix (the pudding). If the plum-pudding model were correct, the positive "pudding", being more spread out than in the correct model of a concentrated nucleus, would not be able to exert such large coulombic forces, and the alpha particles should only be deflected by small angles as they pass through.
Alpha (film) In Upper Paleolithic Europe, 20,000 years in the past, a small tribe of hunter-gatherers prepares for an expedition to hunt for the coming winter's food. Tau, its chief, trains his adolescent son Keda, accepting him and another boy to join the hunting party. His wife Rho worries that Keda is not ready, but Tau believes he is and the hunters set out.