Heat productivities

Heat productivities

Table
Heat productivities
isotope heat productivity, A
(calories per gram per year)
U-235 4.29
U-238 0.71
natural uranium 0.73
Th-232 0.20
K-40 0.22
natural potassium 27(10−6)
Rb-87 130(10−6)
natural rubidium 36(10−6)
major rock province

U
ppm abundances

Th
ppm

K
% heat productivity, A (in 10−13 calories per cubic centimetre per second)
oceanic crust 0.42 1.68 0.69 0.71
continental shield crust (old) 1.00 4.00 1.63 1.67
continental upper crust (young) 1.32 5.28 2.15 2.20
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Universalium. 2010.

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