Could Nuclear Explosives Have Been Used on 9/11

Could Nuclear Explosives Have Been Used on 9/11
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Some have hypothesized that nuclear or thermonuclear devices could account for the spectacular explosion of World Trade Center Building 1 (WTC 1) and World Trade Center Building 2 (WTC 2) on September 11, 2001.
The arguments made for this mode of explosive demolition of WTC 1 and WTC 2 is that there were elevated levels of tritium found in and around the debris pile of the former World Trade Center highrises and that there were vast pools of molten metal found by the firefighters working in the ruble pile weeks after the collapse of the highrises.
The elevated Tritium levels, though not significantly greater than background concentrations, can be explained by the use of tritium radio-luminescent devices used in the World Trade Center Complex at the time
The molten metal discovered "running down the channel rails" by the firefighters can be explained by the presence of thermitic compounds present in all the dust samples that can burn work weeks underground without oxygen at temperatures significantly greater than the melting point of steel.
Also if thermonuclear charges were place in the sub-basements of WTC 1 and WTC 2 all of the sub-basements would have been completely destroyed which contradicts the evidence since there are photos of the sub-basement after the destruction of both towers that show the sub-basements had surprisingly sustained little damage from the collapse of the towers. Additionally there were people in the sub-basements, when WTC 1 and WTC 2 were destroyed, who would have been vaporized by a thermonuclear detonation but instead live to give testimony of the explosions they did experience prior to the collapse of the highrises.