Table 1.  U, Th, and K contents and heat generation
for Portsmouth granite (CP25A),

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sample                                     heat generation
number  interval  U,ppm  Th,ppm  K,wt.%  10^-^1^3cal/ 10^-^6/W/m^3^
                                           cm/sec
============================================================

 562   1843-1847   9.0    24.1    4.0      10.3       4.3

 566   1857-1861   9.1    20.6    3.4       9.6       4.0

 569   1866-1870   8.0    20.6    3.7       9.1       3.8

 573   1880-1884   7.8    17.9    4.0       8.5       3.6

 586   1922-1926   9.8    19.1    3.5       9.8       4.1

 591   1940-1945   9.6    23.8    3.7      10.5       4.4

 599   1964-1968   9.2    24.8    3.4      10.4       4.4

 602   1974-1979   8.5    20.9    3.5       9.4       3.9

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       average     8.9    21.5    3.6       9.7       4.1
   
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