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

Active Publication Date: 2021-10-19
BEIJING RES INST OF URANIUM GEOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem solved by the present invention: the present invention provides a method for measuring uranium isotope ratio, which can solve the inconsistency of the mass fractionation effect of the existing conventional measurement methods, and it is difficult to perform external standard correction. The consistency of the mass fractionation effect of the total evaporation method is good, but The problem that the measurement process takes too long

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  • A kind of measuring method of uranium isotope ratio
  • A kind of measuring method of uranium isotope ratio
  • A kind of measuring method of uranium isotope ratio

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Effect test

Embodiment 1

[0031] The sample of the present embodiment is UTB 030, a kind of assay method of uranium isotope ratio provided by the invention, comprises the steps:

[0032] Step 1. Heat up:

[0033] Parallel spotting was carried out on the UTB 030 sample to ensure that the heating conditions of the spotting were consistent, and the temperature was slowly raised to the middle zone Re + The characteristic peak reaches 200mV, and the temperature of the evaporation zone is controlled to make U + The ion current intensity is not higher than 100mV.

[0034] Step 2. Adjust focus parameters:

[0035] Adjust the focusing parameters under the temperature conditions of step 1, refer to the total evaporation test method, initially control the growth rate of the evaporation zone current, and slowly increase the temperature of the evaporation zone until the ion current intensity meets the measurement requirements and then start the measurement.

[0036] Step 3. Data Acquisition:

[0037] During the...

Embodiment 2

[0051] The sample of the present embodiment is UTB 100, a kind of assay method of uranium isotope ratio provided by the invention, comprises the steps:

[0052] Step 1. Heating: Parallel spotting of UTB 100 samples to ensure that the temperature of the spotting conditions is consistent, and the temperature is slowly raised to the middle zone Re + The characteristic peak reaches 200mV, and the temperature of the evaporation zone is controlled so that U + The ion current intensity is not higher than 100mV.

[0053] Step 2. Adjust focus parameters: adjust the focus parameters under the temperature conditions of step 1, refer to the total evaporation test method, initially control the growth rate of the evaporation zone current, and slowly increase the temperature of the evaporation zone until the ion current intensity meets the measurement requirements and then start the measurement .

[0054] Step 3. Data collection: During the measurement process, adjust the current in the ev...

Embodiment 3

[0067] The sample of the present embodiment is UTB 500, a kind of assay method of uranium isotope ratio provided by the invention, comprises the steps:

[0068] Step 1. Heating: Parallel spotting of UTB500 samples to ensure that the temperature of spotting is consistent, and the temperature is slowly raised to the middle zone Re + The characteristic peak reaches 200mV, and the temperature of the evaporation zone is controlled to make U + The ion current intensity is not higher than 100mV.

[0069] Step 2. Adjust focus parameters: adjust the focus parameters under the temperature conditions of step 1, refer to the total evaporation test method, initially control the growth rate of the evaporation zone current, and slowly increase the temperature of the evaporation zone until the ion current intensity meets the measurement requirements and then start the measurement .

[0070] Step 3. Data collection: During the measurement process, adjust the current in the evaporation zone a...

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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.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/626
Inventor 汤书婷崔建勇王晓明
Owner BEIJING RES INST OF URANIUM GEOLOGY
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