A method for accelerator mass spectrometry using beryllium superhalogen anions

A technology of accelerator mass spectrometry and negative ions, which is applied in the direction of measuring devices, material analysis through electromagnetic means, instruments, etc., and can solve the problems of low beam intensity and instability

Inactive Publication Date: 2016-06-29
INST OF EARTH ENVIRONMENT CHINESE ACAD OF SCI
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Problems solved by technology

[0009] In view of this, the Canadian Isotrace laboratory X-L.Zhao et al. proposed the use of BeF for the first time in 2004 - (Beryllium monofluoride anion) is stable, while BF - Unstable characteristics, expected to BeF - conduct 10 Possibility of AMS measurement of Be, but BeF - compared to BeO - The beam intensity is too small (reduced by 10-50 times), so that this method cannot be a satisfactory replacement for BeO - take measurements

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  • A method for accelerator mass spectrometry using beryllium superhalogen anions
  • A method for accelerator mass spectrometry using beryllium superhalogen anions
  • A method for accelerator mass spectrometry using beryllium superhalogen anions

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Embodiment Construction

[0028] The present invention will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments.

[0029] The present invention utilizes the method that the super halogen anion of beryllium carries out accelerator mass spectrometry, comprises the following steps:

[0030] 1. Preparation of target sample BaBeF 4

[0031] Target samples are used to efficiently produce super halogen anion BeF 3 - , which can be a salt containing Be and F, in this embodiment the target sample is selected BaBeF 4 .

[0032] refer to figure 1 , BaBeF 4 The specific preparation process of the target sample is as follows:

[0033] 1. Add 0.5mMole to 1g loess sample in sequence 9 Be carrier, 6mlH 2 o 2 Solution (H 2 O and H 2 o 2 The volume ratio is 1:1), 6ml12MHCl, mix well and filter off the residue, and record the remaining solution as sample solution A.

[0034] Continue processing of residues:

[0035] First, soak the residue in 25ml 6M HCl ...

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Abstract

The invention discloses a method for measuring accelerator mass spectrometry using super halogen anions of beryllium, which is characterized in that it comprises the following steps: preparing BeF capable of producing super halogen anions 3 - target sample; bombardment target sample with PbF 2 Powder mixing target cone produces BeF 3 - beam current; BeF 3 - The beam is crushed in the tandem accelerator; after passing through the main analysis magnet 9 be 2+ into the removable Faraday cup for measurement, 10 be 2+ passing along the main beamline; 10 be 2+ Directly through the main electrostatic analyzer and the second magnet at the high energy end, and finally into the gas detector for analysis. The benefit of the present invention is that: with BeF 3 - as 10 The extraction beam measured by Be-AMS effectively suppresses the 10 The interference of B makes it unnecessary to use the energy-reducing film for secondary stripping at the high-energy end of the small AMS, resulting in 10 The transmission efficiency of the Be beam is guaranteed (up to 100% transmission at the high-energy end), and the original good beam quality is maintained without the membrane; it effectively avoids the high toxicity of BeO as airborne dust to the experimenters. risks of.

Description

technical field [0001] The invention relates to a method for measuring accelerator mass spectrometry, in particular to a method for measuring accelerator mass spectrometry using beryllium super halogen negative ions, and belongs to the technical field of accelerator mass spectrometry. Background technique [0002] With the development of accelerator mass spectrometry (AMS) technology, long-lived cosmogenic nuclides 10 The research on Be (with a half-life of about 1.5Ma) has developed rapidly in just a few decades, and has been widely used in various fields of earth science and environmental science, such as: [0003] 1. Measured by accelerator mass spectrometry (AMS) 10 Be traces the history of solar activity changes; [0004] 2. The accelerator mass spectrometry (AMS) measurement 10 Be data is used in meteorological research to track global precipitation distribution; [0005] 3. Measured by accelerator mass spectrometry (AMS) 10 Be to determine the age and rate of dep...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/64
Inventor 付云翀张丽赵国庆刘起武振坤
Owner INST OF EARTH ENVIRONMENT CHINESE ACAD OF SCI
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