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Institute for Science and International Security

Washington non-profit; open-source satellite analysis of nuclear weapons programmes worldwide since 1993.

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#140 26 Jun

Estimated 265-287kg of HEU at Esfahan's backfilled tunnels from satellite imagery

Iran Conflict 2026: 461 kg of uranium no one can verify
#136 23 Jun

Estimated 155-175 kg of Iran's 440.9 kg HEU remains unlocated since 28 February

Iran Conflict 2026: Iran takes oil, refuses the inspectors
#71 16 Apr
#74 6 Apr
Analysed byDADavid Albright
assessed fordow penetration for
Iran Conflict 2026 · source event
#44 19 Mar
#41 17 Mar