Liquid-scintillation-based anticoincidence counting of Co-60 and Pb-210

The method of liquid-scintillation-based 4πβ–γ anticoincidence counting was employed to assay the radioactivity concentration of acid solutions containing radionuclides 60Co and 210Pb (in equilibrium with its daughters). The limiting factors on the accuracy for such activity measurements and suggestions for minimizing such factors are reported.