Another indication that the device might have been a reactor is the quantity of fallout. The ‘fallout’ refers to the ppm’s found in the dust from the World Trade Center by the USGS. Different estimates are available for the mass of the towers and how much of that mass was steel as opposed to concrete. These estimates are very close to 200,000 tons of steel and 400,000 tons of concrete for the two Twin Towers together, total.Conservatively, we can estimate that 100,000 tons of structural concrete from each of the towers was pulverized into dust from the force of the explosions. With a minimum of 600ppm of Strontium and 1000ppm by weight of Zinc present in the dust, that translates into 60 tons of Strontium and 100 tons of Zinc in the dust. If we generously assume that as much as one third of the Uranium originally present transmuted into Strontium, this would put the original mass of Uranium present at about 470 tons, per tower. This is a staggering amount. If a lower portion of the Uranium in reactors fssioned into Strontium, then even more Uranium would have been present. How Much Uranium Is There In Nuclear Devices? This depends upon size and power alone. Taking the example of the Indian Prototype Fast Breeder Reactor, this contains 1,758 fuel subassemblies in the core; each subassembly is made up of 217 tubes or fuel pins with an outside diameter of 6.6mm, an internal diameter of 5.7mm and a length of 2.7m. This gives a volume of 6.9 x10-5m 3per pin and a total fuel volume of 26.3 m 3 in the core. The fuel used is normally an 80% - 20% mixture of Uranium Oxide and Plutonium Oxide but enriched Uranium was used on earlier FBR reactors. Let’s assume we use a pure Uranium fuel, which means we are exaggerating the amount of Uranium present in an FBR, but on the other hand FBRs (there are only a handful in operation) have a smaller core than a conventional thermal reactor – so this estimate will actually be lower than what we would expect in a conventional nuclear reactor.Uranium has a density of 18,950 kg m
-3. Therefore with a volume of 26.3m3 of fuel, this equates to nearly 500tons of Uranium present in the cores.These estimates may not be so far off the mark and they seem to support the view that if these explosions we're caused by reactors and not bombs that there were two reactors, and perhaps more. With one larger reactor under each tower this would account for the seismic signals and nuclear blast signatures. So the amount of fallout maybe consistent with more then one reactor.For another example we can consider the small Magnox nuclear reactor first built at Calder Hall in the UK, which went live in 1956. This contained 10,200 fuel elements, each rod of Uranium one meter long with a diameter of 25mm. The total volume of Uranium was therefore 5m3 and the total weight of Uranium fuel in the core was 95tons. This was a small reactor by modern standards but still contains over 1000 times as much Uranium as would be found in a small atomic bomb. The quantity of fallout that was measured in the World Trade Center dust is quite high and provides evidence that the explosions might have been caused by reactors yet there is equal potential that bombs were used since we arenÂ’t privy to current high technology used or the infinite possibilities achieved by the nuclear research industry and the real truth is, we just donÂ’t know. We know, with conclusive data obtained from following decay paths that fission occurred in New York City on September 11th, 2001 but we donÂ’t know what type of device caused it.
