TNT equivalent
The devices were boosted fission weapons using military-grade plutonium, yielding 60.1% of the first tests performed two days earlier. The Theoretical Physics Group (TPG) calculated that the blast yield was 20 kt of TNT equivalent. Although the American Physical Society estimated the yield at based on data received by their computer, Dr. Abdul Qadeer Khan confirmed the TPG blast calculations in an interview in 1998.