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Table 7 Gadolinium Ʃa for different concentrations

From: Methodology and algorithm to correct the thermal neutron porosity for the effect of rare elements and rock minerals with high neutron absorption probability

Mean gadolinium, ppm Σa, CU
0.5 0.2516
1 0.5032
1.5 0.7548
2 1.0065
2.5 1.2581
3 1.5097