Measurement Technology of ¹²⁹I Based on Compact AMS

Based on the accelerator mass spectrometry system (AMS) with a terminal voltage of 0.3 MV which was independently designed and constructed by China Institute of Atomic Energy (CIAE), the ¹²⁹I measurement method has been developed. The high efficiency, high precision and high sensitivity measurement method have been developed by systematic studies on ion transport, gas stripping, charge state selection, background elimination, etc. At present, the transmission efficiency is more than 50%, the measurement accuracy reach 0.4%, and the measurement sensitivity of ¹²⁹I/¹²⁷I=1×10^-14 has been realized by the compact AMS system.