The plutonium bomb was dropped on Nagasaki on August 9th 1945, three days after a uranium bomb had destroyed Hiroshima.
Pakistan has the enrichment know-how North Korea needs for a uranium bomb.
It isn't clear if it has been able to develop a uranium-based bomb, but experts have speculated that it used uranium in its February test.
It is not clear if it has been able to develop a uranium-based bomb, but experts have speculated that it used uranium in its February test.
For one thing, the enrichment of uranium for peaceful purposes is not as pure as enriching uranium for the bomb, and so the facility could control what level of enrichment it would bring uranium to, and therefore, at least establish some guarantee that the Iranians couldn't use this to secretly manufacture a nuclear weapon.
It has since been shopping for equipment and technology to enrich uranium, another bomb-making ingredient.
But the same facilities that are used for peaceful enrichment can be used to enrich uranium for a bomb.
But the North didn't need more plutonium because it also has a secret program to enrich uranium for a bomb.
Michael Mullen, the Chairman of the US Joint Chiefs of Staff, acknowledged that Iran has enough uranium for a bomb.
The U.S. scientists who made the first uranium A-bomb, dubbed "Little Boy, " were so sure that it would work they did not bother to test it.
If the Iranians did start turning their growing stockpile of enriched uranium into a bomb, Mr Obama would indeed find it hard not to respond with force.
ECONOMIST: Iran��s presidential and nuclear future is in doubt
But the same facilities that are used for peaceful enrichment can be used to enrich uranium for a bomb, and inspectors say they have not been able to fully gauge Iran's intentions.
Within a couple of months of your inauguration Iran could have enough low-enriched uranium for one bomb, once the stuff has been boosted (this could take less than another two months) to weapons-grade.
To choke off these materials -- and the illicit means of financing them -- provides the Council with a possibility to make it technically impossible for DPRK to have a functioning uranium-based bomb program.
Bruce Bechtol of the Marine Corps Command and Staff College will deliver, next Monday at Brookings in Washington, a paper contending that North Korea is now or will soon be capable of building a uranium-core bomb.
When that deal collapsed in 2002 after America confronted North Korea with evidence of its cheating secretly buying equipment to enrich uranium (another bomb ingredient) Mr Kim tossed out inspectors, extracted the plutonium from the rods and says he built bombs with it.
What did happen was that the Enola Gay, an American B-29 bomber, dropped a uranium-based atomic bomb on the Japanese city of Hiroshima.
The Israeli government's red line is apparently when Iran has enough enriched uranium to make a bomb (and when they hide it deep underground).
Three Security Council resolutions in recent years have imposed targeted sanctions on the Islamic Republic for refusing to stop enriching uranium, a potential bomb ingredient.
Mark Fitzpatrick argues that if Pyongyang has perfected the highly-enriched-uranium route to a bomb, then there will be heightened concern about the potential for the proliferation of these weapons or materials.
We also heard Arab leaders plead with American diplomats to use force to stop the Iranian nuclear weapons program, which by now may have enough enriched uranium for one spectacular bomb.
After Qom, Iran appeared to back off a bit by agreeing in principle to ship abroad much of its uranium stock (a bomb's worth or thereabouts if sufficiently re-enriched) for reworking to provide the needed reactor fuel.
Though North Korea openly admits making nuclear weapons using plutonium, it has still not come clean about its pursuit of the uranium route to the bomb, even though Pakistan's former chief nuclear scientist, Abdul Qadeer Khan, has reportedly said he sold Mr Kim's regime some uranium-linked nuclear secrets.
Seemingly contradicting Mullen, Defense Secretary Robert Gates claimed that there is no reason to worry about all that uranium because Iran won't have a bomb for some time, given that the uranium it possesses is not sufficiently enriched to make a weapon.
Even more disturbingly, an Iranian opposition group revealed that Tehran had obtained weapons-grade uranium along with a design for a nuclear bomb from a Pakistani scientist, and was covertly enriching uranium at a previously unknown military facility, despite an agreement (one that, not surprisingly, Iranian President Mohammad Khatami claimed as "a great victory") reached with European negotiators earlier this week requiring the Islamic Republic to eschew such activity.
Its centrifuge machines could produce enough bomb-usable uranium for about a weapon a year.
The only thing he has appeared to lack to operationalize this device is a sufficient quantity of bomb-grade uranium.
CENTERFORSECURITYPOLICY: Danger in the Air: Flights to Baghdad Offer Saddam
In 18 instances small amounts of bomb-grade uranium or plutonium were involved.
Israel assesses that Iran will have a sufficient quantity of enriched uranium to make a nuclear bomb by the end of the year.
Last week, the Washington-based Institute for Science and International Security released a report stating that Iran has reached "nuclear weapons breakout capability" -- it has enough uranium to make a nuclear bomb.
CNN: Rice: U.S. will seek to end any 'illicit' nuclear ambitions by Iran
应用推荐