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Such as this.
A few simple minutes of web searching would have revealed that tactical nuclear weapons suitable for this kind of attack, such as variants of the B61 or the ground-penetrating variant known as the B61-11, would have created a massive and distinctive signature, as noted by GlobalSecurity.org:
A 1-kiloton nuclear weapon detonated 20 to 50 feet underground would dig a crater the size of Ground Zero in New York and eject 1 million cubic feet of radioactive debris into the air. Detonating a similar weapon on the surface of a city would kill a quarter of a million people and injure hundreds of thousands more.
Nuclear weapons cannot be engineered to penetrate deeply enough to prevent fallout. Based on technical analysis at the Nevada Test Site, a weapon with a 10-kiloton yield must be buried deeper than 850 feet to prevent spewing of radioactive debris. Yet a weapon dropped from a plane at 40,000 feet will penetrate less than 100 feet of loose dirt and less than 30 feet of rock. Ultimately, the depth of penetration is limited by the strength of the missile casing. The deepest current earth penetrators, the B61 Mod 11, can burrow is 20 feet of dry earth. Casing made of even the strongest material cannot withstand the physical forces of burrowing through 100 feet of granite, much less 850 feet.
Even a minimal level of Internet research would have revealed that it is impossible for a nuclear warhead to have been used without immediate and noticeable effects including a massive crater, something approaching a million cubic feet of radioactive material being ejected into the air, and of course, a massive seismic shockwave that would have been recorded by other nations around the region.
http://blogsearch.google.com/blogsearch?q=USAF+struck+Syrian+nuclear+site
and this
http://www.dailykos.com/storyonly/2007/11/4/115325/307
see the comment thread
http://www.dailykos.com/storyonly/2007/11/5/111535/891
see the comment thread @ the JPost.
