Further study on highly sensitive AMS measurement of 53Mn

The AMS facility at China Institute of Atomic Energy has been equipped with a Delta E-Q3D detection system for the measurements of Mn-53. While the sample material of MnO2 and the extraction ions of MnO- were used previously in AMS measurement of Mn-53 with fairly good results, a method has recently been developed with the extraction of MnF- from ion source using MnF2 and MnO2 + PbF2 as sample materials. As a result, a sensitivity of 10(-14) (Mn-53/Mn) has been achieved. Compared with the original MnO-/MnO2 approach, the method of MnF- extraction, combined with Delta E-Q3D detection technique, demonstrated an improved sensitivity for AMS measurement of Mn-53. (C) 2012 Published by Elsevier B.V.