Digital anti-coincidence counting method with emulated live-time of the extending dead-time: 67Ga standardization

A new programming algorithm implementing the digital anti-coincidence method has been developed. The algorithm emulates the extendable dead-time scheme and calculate the system live-time by counting the clock pulses of the analog-to-digital converter (ADC). The new live-timed anti-coincidence algorithm applied for the 4πβ(LS)-γ system provides a collateral system for the existing primary radionuclide metrology standard in Korea. Using the anti-coincidence method developed, we measure the activity of the gallium-67 with an uncertainty level 1%. The uncertainty level achieved is comparable to the uncertainty level of coincidence method. The newly developed method provides a valuable alternative for coincidence method in the radionuclide metrology, in case that the coincidence method is not suitable to use for activity standardization of the radionuclide under consideration.