Аннотация:A 3MV multi-element accelerator mass spectrometer (AMS) has been installed in Xi'an, China, and preliminary tests have been completed. The results of both background and precision tests for 4 nuclides are 3.1 × 10 –16 , 0.2% ( 14 C); 1.8 × 10 –14 , 1.4% ( 10 Be); 2.3 × 10 –15 , 1.14% ( 26 Al); and 2.0 × 10 –14 , 1.75% ( 129 I). The unique features of this facility are the newly developed ion source accepting solid and CO 2 samples; the specially designed low-energy injector, including a “beam blanking unit” and “Q-snout”; the acceleration tube structure with the combined magnetic and electrostatic suppression; and the function of the slit stabilization in the post-acceleration system. These features are discussed in terms of the end-user's point of view.
