Abstract
In the detection of heavy radioisotopes using AMS different techniques are applied to optimize background reduction for each specific element. It is generally believed that the detection of some elements like 36Cl or 41Ca requires a terminal voltage of at least 5 to 6 MV in order to obtain low enough detection limits. The 3MV HVEE multi-element AMS system combines the detection of 14C with very high accuracy using simultaneous injection, with the detection of 129I using sequential injection. In addition, the system is designed to measure 36Cl at a terminal voltage as low as 3 MV. 14C measurements have shown a precision down to 0.25%, limited only by counting statistics. Performance measurements with the sequential injector have demonstrated good ion beam quality and high energy and mass resolution. Backgrounds for 129I were found to be 2×10−13 for commercial available AgI material.
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