Novel method for analyzing isotope ratio of fissile nuclide particles by virtue of FT-TIMS (fission track-thermal ionization mass spectrometry)

A FT-TIMS, fissile nuclide technology, applied in the field of new FT-TIMS analysis of fissile nuclide particle isotope ratio, can solve the problems of reduced ashing speed of test samples, agglomeration and loss of particles to be tested, and achieve Not easy to lose particles, not easy to lose, high recovery efficiency

Active Publication Date: 2014-04-16
CHINA INSTITUTE OF ATOMIC ENERGY
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Problems solved by technology

This method has limited separation of the particles to be tested from the carrier, and the effect is still not obvious even if the shaking time is prolonged; the ashing method puts the quartz beaker containing the wiped sample into the muffle furnace, and performs ashing in an appropriate range. However, if it is ashed at a higher temperature, the particles to be tested in the test sample will be s

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  • Novel method for analyzing isotope ratio of fissile nuclide particles by virtue of FT-TIMS (fission track-thermal ionization mass spectrometry)
  • Novel method for analyzing isotope ratio of fissile nuclide particles by virtue of FT-TIMS (fission track-thermal ionization mass spectrometry)
  • Novel method for analyzing isotope ratio of fissile nuclide particles by virtue of FT-TIMS (fission track-thermal ionization mass spectrometry)

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no. 1 example

[0060] First embodiment: self-made monodisperse uranium particles with a particle size of 2 μm and a 235U (uranium 235) abundance of 35% were used as a simulated wiping sample in the experiment. Cut a small piece of nuclear pore membrane loaded with the prepared microparticles and add it to 5 mL of isoamyl acetate solution, and vibrate ultrasonically for 20 minutes. Pipette this solution into 4mL collodion solution (the volume ratio of collodion to isoamyl acetate is 0.8:1), and mix well. The mixed solution was prepared as image 3 The irradiated samples are shown.

[0061] In the irradiated sample, the upper collodion layer 134 has a thickness of 20 μm, the central collodion layer 132 has a thickness of 20 μm, and the lower collodion layer 133 has a thickness of 20 μm.

[0062] Put the sample into the tunnel of light water reactor and irradiate for 28 hours, the neutron fluence rate is 9×10 10 n·cm -2 ·s -1 . Put the irradiated sample into 6mol L -1 After etching in Na...

no. 2 example

[0065] Second embodiment: the second embodiment is substantially the same as the first embodiment, the difference is that the thickness of the upper collodion layer 134 of the irradiated sample is 15 μm, and the thickness of the central collodion layer 132 is 30 μm , the thickness of the lower collodion layer 133 is 15 μm.

no. 3 example

[0066] The third embodiment: the third embodiment is substantially the same as the first embodiment, the difference is that the thickness of the upper collodion layer 134 (or the lower collodion layer 133) of the irradiated sample is 15 μm, and the The thickness of the central collodion layer 132 is 20 μm, and the thickness of the lower layer collodion layer 133 (or the upper layer collodion layer 134 ) is 25 μm.

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Abstract

The invention relates to a novel method for analyzing the isotope ratio of fissile nuclide particles by virtue of FT-TIMS (fission track-thermal ionization mass spectrometry). The method is characterized by comprising the following steps of processing nuclide particles to be detected to prepare an irradiation sample; irradiating the irradiation sample; etching the irradiation sample which is irradiated; performing sample preparation and measurement on the irradiation sample which is etched. Compared with the prior art, the method has the benefits that an operating process is simple, the particles are difficult to lose in an etching process, fission tracks on two detectors can be mutually verified to reduce the missing rate of the particles, and the particles are difficult to lose in a transfer process; furthermore, the recovery rate of the particles to be detected is high, and the recovery efficiency of the method is higher than that of a conventional recovery mode.

Description

technical field [0001] The invention relates to an isotope ratio analysis method, in particular to a new FT-TIMS method for analyzing the isotope ratio of fissile nuclide particles. Background technique [0002] The isotope ratio of an element is the ratio of the abundance of each isotope in the element. The ratio of the atomic abundance of heavy isotopes to the atomic abundance of light isotopes of the element. Because the isotope ratio is difficult to measure accurately, and the isotope ratio is only an important basis for determining the relevant information of the ore, the analysis method of the isotope ratio is one of the focuses of researchers at present. In the prior art, the combination of fission track (FT) screening of hot particles and thermal surface ionization mass spectrometry (TIMS) measurement is a recognized technical route for particle isotope analysis. Scholars at home and abroad mainly use polycarbonate or mica as fission track detectors, disperse the p...

Claims

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Application Information

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IPC IPC(8): G01N27/62G01N1/44G01N27/626
Inventor 陈彦赵永刚李力力王凡常志远
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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