Speaker
Description
Measurements of activity concentration using gamma - gamma coincidence is better than single measurement in terms of minimizing spectrum background, summing effects and pulse pile-up \cite{metwally}. Detection limits can be improved by eliminating the internal activity in $LaBr_3$:Ce scintillator through gamma - gamma coincidence condition \cite{Drescher}. An array of $LaBr_3$:Ce (2" by 2") detectors connected to a Digital Signal Processing system were used for measurement of natural occuring radioactive materials (NORM) in 1L Marinelli beakers for particular measurements with U ore and Th ore. Gamma - gamma coincident spectra were generated by setting software gates on $\gamma - \gamma$ matrices associated with the U and Th ore samples respectively. The results of these measurements will be presented and discussed.
