A two-dimensional analysis of three coincident gamma-rays in 108Agm decay, detected by two NaI(Tl) scintillation detectors, allows a direct measurement of the source activity
A modification of Eldridge - Crowther formulas derived originally for 125I was done recently for the case of two coincident gamma-rays in 60Co decay. A similar approach is applied to a more complicated case of three coincident gamma-rays in the108Agm decay. The large number of experimental quantities, measured both in coincidence and anticoincidence modes, allows the determination of both detector efficiencies for all three x-ray photo-peaks and the source activity. Results are compared with measurements of the activity of the same source with HPGe detectors.
Contour plot for a two-dimensional histogram of coincident events. Six coincident peaks and six coincident summation peaks are clearly seen.
Lead Organizational Unit:pml