[en] This article discusses the history of Nuclear Physics at Chalk River. It began with the construction of a 150 kV Cockcroft-Walton generator in 1946, which was replaced in 1949 by a 250 kV generator. These machines were used to measure neutron cross sections of various elements. In 1952 a 3 MV Van de Graaff was installed and operated. Although it was intended for fast neutron work, the Van de Graaff was actually used for studying energy levels in the 1p and 2s1d shells via inelastic scattering, capture gamma, and stripping reactions involving protons, deuterons and helium projectiles. Five years later the van de Graaff was replaced by a Tandem Van de Graaff accelerator. First beam from a superconducting cyclotron was extracted in 1985