A kind of measuring method of uranium isotope ratio

A technology of isotope ratio and determination method, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of inconsistent mass fractionation effect, difficult external standard calibration, and time-consuming measurement process, achieving short cycle, wide application range, high efficiency effect
CN109900771BActive Publication Date: 2021-10-19BEIJING RES INST OF URANIUM GEOLOGY
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
BEIJING RES INST OF URANIUM GEOLOGY
Publication Date
2021-10-19

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Abstract

The invention belongs to the technical field of material property determination, and in particular relates to a method for determining a uranium isotope ratio. The present invention includes the following steps: Step 1. Heating up: applying current to make the ionization zone and evaporation zone and the temperature of the evaporation zone where the ion current intensity of the control sample is less than 100mV; Step 2. Adjusting the focusing parameters: adjusting the focusing parameters at a low evaporation zone temperature , to stabilize the sample peak platform; Step 3. Data collection: refer to the pre-evaporation heating rate to raise the temperature of the evaporation zone to the set test ion current intensity; Step 4. Data fitting; Step 5. Data derivation: use the fitting result The equation calculates the data for 1-2 cycles; Step 6. Selection of the starting point of the derived data; Step 7. Calculation of the result: Calculate the mean value of the data between the starting point of fractionation correction and the end point of the calculation. The invention can solve the problem that the mass fractionation effect of the existing conventional measurement methods is inconsistent, and it is difficult to perform external standard correction, and the pervaporation method has good consistency of the mass fractionation effect, but the measurement process takes too long.
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Description

technical field

[0001] The invention belongs to the technical field of measuring material properties, and in particular relates to a method for measuring uranium isotope ratios. Background technique

[0002] Thermal ionization mass spectrometry is a classic method for determination of isotope composition, widely used in research fields such as nuclear materials and isotope geology, and its thermal ionization method determines that the isotope mass fractionation effect is the main factor affecting the accurate determination of isotope composition It is very difficult to obtain mass fractionation coefficients from mass spectrometry.

[0003] The mass fractionation effect adopts any one of the three mass fractionation correction modes of linear correction, exponential correction and logarithmic correction for mass fractionation correction.

[0004] For elements containing isotope reference ratios, use them as internal standards, such as the determination of strontium or neodym...

Claims

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