Double-injected tandom accelerator mass spectrometer

Abstract

The double-injection tadem accelerator mass spectrometer is characterized by that its injection system comprises double-focussing speed analzer, static quadrupole lens and mass recombiner. On the premise of no changing detected nuclide species and accuracy said inventino can reduce its cost, and possesses the advantages of simpe structure and operation, and is applicable to detection analysis of various long-life radionuclides.

Description

technical field [0001] The invention belongs to the improvement of the accelerator mass spectrometer structure. Background technique [0002] Accelerator mass spectrometry is a rapidly developing application field of accelerator technology and a new technology of ion beam analysis. Facts have shown that Accelerator Mass Spectrometer (AMS) technology is a highly sensitive method for analyzing long-lived radionuclides. At the end of the 1970s, when the accelerator mass spectrometer based on accelerator mass spectrometry came out, two types of operation modes of the injection system structure were proposed, namely the alternate injection mode and the simultaneous injection mode. [0003] (1). Single alternate injection system At present, among the nearly 50 AMS devices in the world, most of them use the alternate injection system called "energy jumping magnet (bouncer magnet)". This technique was first proposed by K.H.Purser et al. [K.H.Purser et al., in: Proc. 1st Conf. On R...

AI Technical Summary

Problems solved by technology

The first generation of simultaneous injection system [D.E.Lobb, et al., Nucl.Instr. & Meth.179(1981)171] was in normal operation in 1984, but the system has different paths for ions of various masses when passing through the magnet. Second-order effects caused by different polar angles are not considered

Proposal of the second generation simultaneous injection system [A.E.Litherland, et al., Nucl.Instr. & Meth.B52 (1990) 375; K.H.Purser, et al., Nucl.Instr. & Meth.B35 (1988) 284], It can meet Brown's achromatic requirements, but the problem is that the focal plane at the symmetry plane of the system is not perpendicular to the central orbit

However, in subsequent reports, this double injection structure was not mentioned, only a single simultaneous injection system was mentioned.

The reason for this analysis is that there are still some technical problems unresolved in the double-injection structure. It is difficult to get the best of both worlds by using the same optical path in this hybrid double-injection structure by inserting alternately injected optical path elements into the optical path elements of the simultaneous injection system. Can be analyzed, but difficult to achieve high accuracy

Images