Method for measuring negative thermal ionization mass spectrometry of molybdenum isotope abundance

A technology for isotope abundance and mass spectrometry measurement, which is applied in the field of molybdenum isotope abundance negative thermal ionization mass spectrometry measurement. It can solve the problems of large relative standard deviation of measurement results and long measurement time. The effect of measurement accuracy

Active Publication Date: 2012-07-11
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, Sr(NO 3 ) 2 As an emitter, the measurement time is longer; Ca(NO 3 ) 2 In

Method used

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  • Method for measuring negative thermal ionization mass spectrometry of molybdenum isotope abundance
  • Method for measuring negative thermal ionization mass spectrometry of molybdenum isotope abundance
  • Method for measuring negative thermal ionization mass spectrometry of molybdenum isotope abundance

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Embodiment 1

[0036] A method for measuring molybdenum isotope abundance negative thermal ionization mass spectrometry of the present invention comprises the following steps: step 1 rhenium strip coating sample, step 2 temperature rise measurement and step 3 data correction.

[0037] Step 1 specifically includes the following steps:

[0038] Step 1.1 drop-coating molybdenum on the rhenium ribbon wire of the double rhenium ribbon assembly including the sample belt and the ionization belt, the sample amount can be 0.1-1 μg, preferably 1 μg;

[0039] Step 1.2 Place the double rhenium ribbon assembly in a vacuum environment, connect it to a 5.5A current, continue to supply power for 10 minutes, and use a burning ribbon device to remove surface impurities and water vapor; the vacuum degree of the above vacuum environment is preferably 1×10 -6 mbarPa;

[0040] Step 1.3 Take out the double rhenium tape assembly from the burning tape device and place it on the sample coating device;

[0041] Step...

Embodiment 2

[0073] The difference between this embodiment and embodiment 1 is:

[0074] In steps 2.2 and 2.4, vacuumize the ion source, and the vacuum degree of the ion source after vacuuming is 5×10 -7 mbar.

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Abstract

The invention belongs to the field of measurement of molybdenum isotope abundance, and more particularly relates to a method for measuring the negative thermal ionization mass spectrometry of molybdenum isotope abundance. The method comprises the three steps of rhenium strip sample coating, temperature raise measurement and data correction. According to the method disclosed by the invention, a negative thermal ionization mass spectrometry measuring method is adopted, a double-rhenium-strip assembly is used, and a SrCl2 solution is used as a cast charge. The method disclosed by the invention solves the technical problems of large sample coating amount, long measuring time and larger relative standard deviation of a measuring result in the prior art. According to the method disclosed by the invention, all index parameters are relatively balanced, thus the technical effects of smaller sample coating amount, short measuring time and smaller relative standard deviation of the measuring result are achieved; and the method is particularly suitable for measuring requirements of a radioactive sample and a biological sample with low cost.

Description

technical field [0001] The invention belongs to the field of molybdenum isotope abundance measurement, in particular to a method for measuring molybdenum isotope abundance negative thermal ionization mass spectrometry. Background technique [0002] The atomic number of molybdenum (Mo) is 42, and there are 7 stable isotopes 92Mo, 94Mo, 95Mo, 96Mo, 97Mo, 98Mo and 100Mo. Molybdenum is widely distributed in molybdenite and meteorites in nature. Molybdenum is also an essential micronutrient element for animals and plants. The measurement of molybdenum isotope abundance is of great significance in geological and biological research. At the same time, the molybdenum isotope is located near the first peak of the mass distribution curve of 235U thermal neutron fission products, and the fission yield of 98Mo is 5.75%. 98Mo can be used as an ideal fuel element burnup measurement monitoring body. When measuring the burnup of fuel elements by the destruction method, the abundance of 98M...

Claims

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Application Information

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IPC IPC(8): G01N27/64G01T1/167
Inventor 梁帮宏张劲松邓辉杨彬张舸
Owner NUCLEAR POWER INSTITUTE OF CHINA
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