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Double-injected tandom accelerator mass spectrometer

A technology of accelerator mass spectrometry and dual injection, applied in accelerator mass spectrometers, mass spectrometers, instruments, etc., can solve the problems of unconsidered secondary effects, single simultaneous injection system, difficulty in high precision, etc.

Inactive Publication Date: 2004-08-18
INST OF EARTH ENVIRONMENT CHINESE ACAD OF SCI
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  • Abstract
  • Description
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  • Application Information

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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

Method used

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  • Double-injected tandom accelerator mass spectrometer

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Embodiment Construction

[0022] According to the technical scheme of the present invention, the multi-sample device on the ion source can adopt the rotary product of NEC Company, but the injection energy is determined as 40keV of HVEE Company; the velocity analyzer adopts the structure of NEC Company; the mass recombiner adopts the structure of HVEE Company The tandem accelerator adopts the Pelletron 9SDH-2 type of NEC Company or the Tandtron 4130 type of HVEE; the high-energy mass spectrometry system adopts the products of NEC or HVEE.

[0023] The application example of the present invention in Institute of Earth Environment, Chinese Academy of Sciences is shown in Fig. 1. The structural parameters of the beam optical elements of its serial double injection system are as follows:

[0024] Long L of Velocity Analyzer m =30cm, electrode spacing d=5cm, electric field strength E=1kV / cm, need to use two output as 3kV pulse power supply to the two electrodes, magnetic field strength is 4kG, the distance ...

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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 alternating 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D59/44G01N27/62H01J49/42
CPCH01J49/0086
Inventor 周卫建陈茂柏
Owner INST OF EARTH ENVIRONMENT CHINESE ACAD OF SCI
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