1935 A. 150 652 Comparing the gamma production coefficient with the neutron absorption co-efficient.
1946 14 June 699/2 Radioactive isotopes are created in chain-reacting piles by..the fission of U 235 nuclei..and..neutron absorption by nonfissionable nuclei.
1984 E. P. DeGarmo et al. (ed. 6) iv. 106 Hafnium, thorium and beryllium are used in nuclear reactors because of their low neutron-absorption characteristics.