... 4,40(50)-bis-t-butyl-cyclohexano-18-crown-6, a highly selective complexant for Sr2þ, immobilizedon an inert support. The column is washed with 12 column volumes of 8 MHNO3, which removes Ca and ... of210Pb soil inventories. J. Environ. Radioactivity 41 :111 –125.Bunzl, K., Flessa, H., Kracke, W. and Schimmack, W. 1995. Association of fallout239,240Pu and 241Am with various soil components ... the development of ICP-MS, and there are a number of NAA methods for long-lived radionuclides,principally129I (Muramatsu and Yoshida, 1995; Parry et al., 1995),232Th and 238U (Edgington,...