“But then I would remember what Weinmann-Smith told me: there is at least enough nuclear material in the world to make 200,000 bombs, and the International Atomic Energy Agency speculates that 30 countries have the capability to do so.” (Whyte, 2018, p.13).

Reference

Whyte, C. (2018) Huntig Potential Nuclear Bombs. New Scientist. 04 August 2018, p.13.