Summary of Concentrations of Th-232
in Major Rock Types and Soil

Rock Type	ppm	Bq/kg	pCi/kg
Igneous Rocks
Basalt (crustal average)	3-4	10-15	270-405
Mafic	1.6-2.7	7-10	189-270
Salic	16-20	60-80	1620-2160
Granite (crustal average)	17	70	1890
Sedimentary Rocks
Shale Sandstones	12	50	1350
Clean Quartz	<2	<8	<216
Dirty Quartz	3-6?	10-25?	270-675?
Arkose	2?	<8	<216
Beach Sands (unconsolidated)	6	25	675
Carbonate Rocks	2	8	216
Continental Upper Crust
Average	10.7	44	1188
Soils	9	37	999

Radionuclide Information
Nuclide	Half-Life	Alpha Energy (MeV)	Beta Energy (keV)	Gamma Energy (keV)	ALI/DAC
Th-212	0.03 s	7.92
Th-213	0.14 s	7.69
Th-214	0.10 s	7.68
Th-215	1.2 s	7.40 7.52
Th-216	0.18 ms 28 ms	9.91 7.92
Th-217	0.25 ms	9.25
Th-218	0.11 us	9.67
Th-219	1.05 us	9.34
Th-220	10 us	8.79
Th-221	1.7 ms	8.146 8.471
Th-222	2.8 ms	7.98
Th-223	0.65 s	7.29 7.32
Th-224	1.05 s	7.17 7.00		176
Th-225	8.72 m	6.479 6.441 6.501		322 246 359
Th-226	30.6 m	6.338 6.228		111.1 242.1 131.0	Th-226.html
Th-227	18.72 d	6.038 5.978 5.757		10.7 12.4 25.1 56.7 236.0	Th-227.html
Th-228	1.91 y	5.42 5.34	65.0 9.1 79.5	12.3 84.3	Th-228.html
Th-229	7340 y	4.845 4.901 4.815 4.798 4.968 4.979 5.050	6.2 9.1 12.5 20.6 20.6 23.5 56.0 67.2	12.3 85.4 88.5 100.0	Th-229.html
Th-230	77000 y	4.621 4.688	48.4 62.9 66.5	12.3	Th-230.html
Th-231	25.52 h		205.5 286.7 287.6 304.8	14.3 92.4 984.5 1025.9 1.0285	Th-231.html
Th-232	14.1E9 y	3.953 4.010	9.1 39.8 54.2 57.8	12.3	Th-232.html
Th-233	22.3 m		1.245	86.5 29.4 459.3
Th-234	24.1 d		96.2 188.6 95.8 75.8	13.3 63.3 92.3 92.8	Th-234.html
Th-235	7.2 m		-----	417.0 727.2 696.1 644.9
Th-236	37.5 m		-----	110.8
Th-237			-----