jan 1, 2003 - 2003
January 10 - North Korea announces it will withdraw from the Nuclear Non-Proliferation Treaty.
February 5 - North Korea announces that it had reactivated its nuclear facilities and is going ahead with their operation "on a normal footing."
February 9 - Iran acknowledges for the first time that it has uranium ore reserves and that it will reprocess the spent fuel. But it insists the nuclear program was designed solely for civilian use.
February 27 - The United States says North Korea has reactivated its five-megawatt nuclear reactor at Yongbyon.
May 12 - North Korea backs out of the only remaining legal obligation blocking its nuclear ambitions, a 1992 pact with South Korea to keep the peninsula free of nuclear weapons.
May 14 - Russia's lower house of parliament votes to ratify the Strategic Offensive Reductions Treaty (Moscow Treaty).
May 29 - Russia's upper house of parliament votes to ratify the Strategic Offensive Reductions Treaty (Moscow Treaty).
July 9 - Ukraine will get $85 million to build a new shield over Chernobyl to stabilize the old "sarcophagus" covering the gaping hole in reactor No. 4.
August 26 - U.N. inspectors have found traces of highly enriched, weapons-grade uranium at an Iranian nuclear facility.
August 26-29 - Six-party talks aimed at ending the standoff over North Korea's suspected nuclear weapons program take place in China.
September 9 - Edward Teller, "father of the H-bomb" dies.
September 25 - The IAEA team in Iran has found additional traces of weapons-grade uranium in Iran.
September 26 - Afghanistan signs, ratifies Comprehensive Nuclear Test Ban Treaty.
October 29 - Iran delivers a report to the IAEA to allay international concern about its nuclear program.
November 10 - The International Atomic Energy Agency reports that Iran has acknowledged producing a small amount of plutonium, a material useable in a nuclear bomb.
December 18 - Iran signs Protocol on Snap UN Nuclear Inspections.
December 19 - Libya has admitted trying to develop weapons of mass destruction. It is discovered that Libya's nuclear weapons program is "much further advanced" than U.S. and British intelligence agencies had thought, and includes centrifuges and a uranium-enrichment program, all necessary components in making a nuclear bomb.
Added to timeline:
atomic and nuclear physics