Primary activity standardization of 177Lu for calibrating commercial dose calibrator

Abstract

Primary activity standardization of 177Lu has been conducted at the Center for Technology of Radiation Safety and Metrology-National Nuclear Energy Agency (PTKMR-BATAN) to establish a national reference standard for 177Lu measurements. The standardization was performed using a 47i(3(LS)-y coincidence counting system with digital coincidence counting (DCC) technique. The activity standardization of 177Lu gave a result of 148 kBq/g + 1.78 kBq/g at a reference time with uncertainty value evaluated at k = 2. The result was then used to establish a secondary standard by calibrating the reference ionization chamber using the ‘dialing-in’ method. A dial setting value of 024 was obtained on the standard reference IC. The new dial setting will be used in the routine calibration services of commercial dose calibrator to ensure all measurements of 177Lu are traceable to the national standards.