Parameter Amount Units Ref Uniformitarian Decay Time (tTotal) 4.54E+09 year 11 tHalf( 235U) 7.04E+08 year 4 tHalf( 238U) 4.47E+09 year 5 tHalf( 232Th) 1.40E+10 year 5 tHalf( 40K) 1.28E+09 year 5 tTotal/tHalf( 235U) 6.45 year/year tTotal/tHalf( 238U) 1.02 year/year tTotal/tHalf( 232Th) 0.32 year/year tTotal/tHalf( 40K) 3.55 year/year 2tT/tHU235 = 2^[t Total/tHalf( 235U)] 87.47 kg/kg 2tT/tHU238 = 2^[t Total/tHalf( 238U)] 2.02 kg/kg 2tT/tHTh232 = 2^[t Total/tHalf( 232Th)] 1.25 kg/kg 2tT/tHK40 = 2^[t Total/tHalf( 40K)] 11.69 kg/kg MCurrent( 235U) 4.83E+13 kg F28 MCurrent( 238U) 6.66E+15 kg F30 MCurrent( 232Th) 2.68E+16 kg F25 MCurrent( 40K) 1.72E+16 kg F26 MInitial( 235U) = 2tT/tHU235MC( 235U) 4.22E+15 kg MInitial( 238U) = 2tT/tU238MC( 238U) 1.35E+16 kg MInitial( 232Th) = 2tT/tHTh232MC( 232Th) 3.36E+16 kg MInitial( 40K) = 2tT/tHK40MC( 40K) 2.02E+17 kg ∆M(235U) = MI( 235U) – MC( 235U) 4.18E+15 kg ∆M(238U) = MI( 238U) – MC( 238U) 6.81E+15 kg Table 4 - Accelerated Decay Energy STERNBERG Craters and cracks 2023 ICC 52
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