Table 2. U, Th and K contents.

a	sample GDB	238U (ppm)						232Th (ppm)		K (%)
		(234Th)		(226 Ra)		(210Pb)
	9	1.28	±0.10	1.64	±0.03	1.17	±0.16	2.23	±0.09	7.595	±0.056
	8	0.68	±0.04	0.99	±0.01	1.09	±0.10	1.84	±0.06	2.523	±0.023
	7	1.91	±0.14	1.99	±0.04	1.72	±0.13	4.14	±0.20	3.527	±0.029
	6	2.26	±0.22	1.93	±0.05	1.66	±0.16	4.47	±0.27	3.065	±0.031
	5	2.25	±0.16	1.61	±0.03	1.27	±0.12	4.03	±0.19	2.747	±0.024
	4	2.06	±0.16	1.68	±0.03	1.17	±0.12	4.13	±0.20	2.913	±0.026
	3	1.40	±0.08	1.04	±0.01	0.89	±0.10	2.94	±0.11	2.011	±0.020
	2	1.30	±0.07	1.06	±0.01	0.81	±0.09	2.58	±0.08	1.700	±0.016
	1	1.07	±0.07	1.11	±0.02	1.02	±0.11	2.56	±0.10	1.756	±0.020
b	sample GDB	238U (ppm)						232Th (ppm)		K (%)
		(234Th)		(226 Ra)		(210Pb)
	9	1.57	±0.11	1.36	±0.02	0.85	±0.22	1.49	±0.06	5.247	±0.067
	8	1.25	±0.04	nd		nd		2.05	±0.04	1.975	±0.101
	7	1.72	±0.09	nd		nd		1.86	±0.07	3.497	±0.178
	6	2.02	±0.12	1.47	±0.03	1.46	±0.22	1.65	±0.07	1.143	±0.021
	5	1.31	±0.15	0.80	±0.03	0.80	±0.29	1.14	±0.08	0.846	±0.022
	4	0.83	±0.02	nd		nd		0.50	±0.00	0.840	±0.043
	3	0.69	±0.01	nd		nd		1.52	±0.01	1.040	±0.053
	2	2.17	±0.14	1.25	±0.03	1.02	±0.28	1.32	±0.08	0.881	±0.022
	1	0.88	±0.10	0.63	±0.02	0.45	±0.20	1.66	±0.06	1.103	±0.022
c	sample GDB	mass proportion of coarse fraction		238U (ppm)				232Th (ppm)		K (%)
				(234Th)		(226 Ra)
	9	22%		1.46	±0.11	1.57	±0.03	2.02	±0.07	6.944	±0.047
	8	16%		0.77	±0.03			1.87	±0.05	2.436	±0.025
	7	6%		1.88	±0.12			3.71	±0.16	3.521	±0.041
	6	13%		2.18	±0.19	1.84	±0.04	4.07	±0.24	2.750	±0.027
	5	13%		1.88	±0.13	1.29	±0.02	2.89	±0.12	1.994	±0.017
	4	4%		2.00	±0.15			3.97	±0.19	2.821	±0.025
	3	7%		1.35	±0.08			2.84	±0.10	1.942	±0.019
	2	12%		1.41	±0.07	1.08	±0.01	2.42	±0.07	1.598	±0.014
	1	20%		1.01	±0.05	0.96	±0.01	2.28	±0.08	1.547	±0.015

a) U, Th and K contents for the < 2 mm fraction deduced from high resolution gamma spectrometry. The U contents are deduced from the activity of different daughters in the decay chain: mainly ²³⁴Th, ²¹⁴ Pb and ²¹⁴Bi in equilibrium with ²²⁶Ra, and ²¹⁰Pb. b) U, Th and K contents for the 2 mm-1 cm fraction deduced from high resolution gamma spectrometry (GDB1, 2, 5, 6, 9) or ICP-MS or AES (GDB3, 4, 7, 8). c) Mean U, Th and K contents calculated from a and b, weighted by the mass proportion of the < 2 mm and 2 mm-1 cm fractions. The proportion of the 2 mm– 1 cm fraction per sample is indicated (i.e. mass of 2 mm-1 cm fraction on total dry mass of material < 1 cm) These content values represent the contents that would have been obtained if the whole < 1 cm fraction had been crushed, homogenized and analyzed.