“The WTC contained no exit signs with tritium, according to the group studying the tritium samples found at the WTC. (Parekh, et al and Semkow, et al)” - Where Did the Towers Go? by Dr Judy Wood p. 372

“Study of Traces of Tritium at the World Trade Center” - (Parekh, et al and Semkow, et al)

“Tritium in the World Trade Center September 11th, 2001 Terrorist Attack, It’s Possible Sources and Fate” - (Parekh, et al and Semkow, et al)

“The amount of tritium found in a sample from WTC6 is approximately 50 times the background level.” - Where Did the Towers Go? by Dr Judy Wood p. 376