Abstract:
From a commercial supplier a solution containing 226Ra has been standardized at National Laboratory for Ionizing Radiation Metrology (LNMRI) for the first time using Liquid scintillation based measurement. The measurement methods are 4[beta][alfa][omega]-[gama] live-timed anticoincidence counting. The results obtained by anticoincidence counting were adopted as reference value and its combined uncertainty was 0.94 %. The agreement of this reference value with reference system with ionization chamber was 0.56 %. This standardization was made in order to reduce the uncertainty in 226Ra measurement in Brazil.
