Abstract
A photon–photon coincidence system was constructed for the standardization of 125I and 109Cd in PTKMR-BATAN, Indonesia. Two NaI(Tl) detectors of 76mm diameter × 6mm thickness with 0.5mm aluminum window were used, which were positioned approximately symmetrically to the source holder. The electronic chain was almost the same as for a 4πβ-γ system. The CANBERRA Multiport II multi channel analyzer was used for energy calibration and a Philips type PM3092 oscilloscope for visualization of the pulses. A polyethylene plastic was used as the source substrate for the 125I and 109Cd samples. The activity of a 125I solution was measured by the photon–photon coincidence and the efficiency extrapolation method (Schrader and Walz, 1987), whereas the activity of a 109Cd solution was determined by a tracer method using 125I (Schrader, 2006). The result of the 125I activity showed good agreement with the result of measurements using a calibrated ionization chamber, and the result of 109Cd also showed good agreement with the measurements result using a LEGe detector.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
