Further investigations of a simple counting technique for measuring mixtures of two pure beta-emitting radionuclides.
A simple liquid scintillation counting technique to measure the activity composition of a mixture containing two known pure beta-emitting radionuclides was recently developed at the NMISA. The method has been applied to various two-component mixtures of (32)P, (33)P and (35)S, primarily to gauge the effect of spectral energy differences on the method's ability to extract the individual activities. Excellent results were obtained for mixtures of (33)P and (35)S, radionuclides with similar, low beta energies. Mixtures containing the high-energy beta-emitter (32)P were more difficult to resolve, although quenching of the counting sources with CHCl(3) improved mixture resolution.
van Wyngaardt
W M
WM
National Metrology Institute of South Africa, Rosebank, 7700 Cape Town, South Africa. FvWyngaardt@nmisa.org
Simpson
B R S
BR
Jackson
G E
GE