Check eq. (32.4) by estimating the radioactive heat production rate using data from Table 20.6 Take the
Question:
Check eq. (32.4)
by estimating the radioactive heat production rate using data from Table 20.6
Take the fractional abundances of 235U, 40K to be 0.72%, 0.012%. Take the average energy release in 40K decay to be 0.71MeV.
Transcribed Image Text:
O = 98CU + 26.5CTH + 0.0035Ck[µW/kg] Half-life (y) Initial decay Average Subsequent decay chain Nuclide Crustal abundance (C) energy 238 U → 206 Ph + 8 a + 47.7 (51.6) MeV 234Th 231 Th 228 Ra B- "Ca (89%) 4.2 MeV 238U 235 U 232Th 40K 2.7 ppmm 19 ppbm 9.6 ppmm 2.4 ppmm 4.46 x 10° 4.4 McV 232 Th- 208Pp + 6 a + 40.5 (42.6) MeV 14.0 x 10 1.25 x 10 4.0 MeV 0.56 MeV EC 40Ar (11%) 1.46 MeV
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