During the second world war, Canada made several important contributions to the wartime work of the Manhattan Project. The three main contributions were: establishing a domestic nuclear research laboratory in Montreal to investigate heavy water reactors, creating supply chains to provide uranium oxide, heavy water and polonium to the Manhattan Project, and the direct contributions of several Canadians living the United States. These wartime efforts helped establish a legacy of nuclear research in Canada which has persisted to the present day.
@article{arxiv.2103.08582,
title = {Canadian Contributions to the Manhattan Project and Early Nuclear Research},
author = {S. A. Andrews and M. T. Andrews and T. E. Mason},
journal= {arXiv preprint arXiv:2103.08582},
year = {2021}
}