Method for carrying out accelerator mass spectrometry measurement by using super halogen anions of beryllium

Abstract

The invention discloses a method for carrying out accelerator mass spectrometry measurement by using super halogen anions of beryllium. The method is characterized by comprising the following steps: preparing a target sample capable of producing super halogen anions BeF3<->; bombarding the target sample and a PbF2 powder mixing target cone to generate a BeF3<-> beam; crushing the BeF3<-> beam in a tandem accelerator; enabling <9>Be<2+> to enter a mobile Faraday cup for measurement after passing through a main analysis magnet; enabling <10>Be<2+> to pass through along a main beam line and to directly pass through a main electrostatic analyzer and a second magnet at the high-energy end; and finally entering a gas detector for analysis. The method has the beneficial effects that interference of <10>B is effectively inhibited at the extraction stage by the extracted beam which is measured by taking BeF3<-> as <10>Be-AMS, so that the high-energy end of a miniature AMS does not need to be peeled off twice by using an energy-reducing film, and the transmission efficiency of the <10>Be beam is ensured (the high-energy end achieves 100% transmission), the original good beam quality is maintained in the absence of the film, and the risks to experimenters due to the fact that BeO as airborne dust has high toxicity are effectively avoided.

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...

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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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