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Method for quickly obtaining apatite fission track annealing rate and spontaneous track density

A fission track and apatite technology, which is applied in the preparation of test samples, instruments, electrical digital data processing, etc., can solve the problems of high operating experience requirements, affecting the determination of fission track parameters, and complicated operation steps. , to achieve the effect of high test accuracy, short test cycle and simple method

Active Publication Date: 2017-05-31
CHINA UNIV OF PETROLEUM (BEIJING) +1
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Problems solved by technology

[0010] In the traditional method, when measuring parameters such as spontaneous track density, closed track length distribution, Dpar value and Dper value under laboratory conditions, it is necessary to screen out apatite from rock samples first, and then use epoxy resin to carry out particle analysis. Bonding, rough grinding, polishing and etching of the consolidated sample, and then the above parameters can be tested with an optical microscope, the operation steps are extremely cumbersome
Moreover, rough grinding and polishing require a high level of operating experience for the experimenter, and if they are negligent, too many scratches will be generated, which will seriously affect the determination of fission track parameters.

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  • Method for quickly obtaining apatite fission track annealing rate and spontaneous track density
  • Method for quickly obtaining apatite fission track annealing rate and spontaneous track density
  • Method for quickly obtaining apatite fission track annealing rate and spontaneous track density

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Embodiment Construction

[0075] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0076] According to the etching principle of apatite fission track, the invention proposes a fission track volume calculation model. Such as Figure 1a-1d Surface track and closed track etch processes shown. Initial stage 1.1 ( Figure 1a ), apatite particle 1.5 contains 3 subsurface tracks, including 2 surface subsurface tracks 1.1.2 and a closed subsurface track 1.1.3 intersecting the surface subsurface track. When the etchant enters the submerged track 1.1.2, it will show differential corrosion along the track direction and vertical track edge direction, and the etching rate along the track direction is significantly greater than that vertical to the track edge direction, resulting in submerged track Traces form conical pits 1.2.2 (Stage 1.2, as in Figure 1b ), while particle surface 1.1.1 is eroded to surface 1.2.1. Subsequently, the etchant...

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Abstract

The invention discloses a method for quickly obtaining an apatite fission track annealing rate and spontaneous track density. The method comprises the following steps: 1) establishing a fission track volume model, and acquiring total volume of fission tracks in a sample; 2) establishing an apatite particle volume model, and acquiring total volume of apatite particles in the sample; 3) proposing volume fraction of the fission tracks so as to propose a concept of a fission track volume index; 4) according to the fission track volume model and volume index, establishing a relation between the fission track volume index and the annealing rate and spontaneous track density; and 5) acquiring the absorption coefficient of the sample by use of terahertz time-domain spectroscopy, and representing the volume index of the fission tracks by use of the absorption coefficient. Thus, the fission track annealing rate and spontaneous track density of the sample are obtained through terahertz time-domain spectroscopy.

Description

technical field [0001] The invention relates to the research field of apatite fission track testing method in low-temperature thermochronology, in particular to a method for rapidly obtaining annealing rate and spontaneous track density of apatite fission track. Background technique [0002] The low-temperature thermochronology dating method is to calibrate the thermal age of rocks based on the production and accumulation of decay or fission products of radioactive elements in rock minerals in mineral crystals, that is, to quantitatively determine rocks and minerals at a certain time or a certain time in geological history. The temperature experienced by the point, and then reconstruct the thermal evolution history experienced by the geological body where it is located. The fission track analysis technique is based on 238 A key technology of low-temperature thermochronology based on the fission radiation damage effect, which uses chemical etching to reveal and analyze the f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3586G01N1/28G06F19/00
CPCG01N1/28G01N21/3586G16C20/30
Inventor 邱楠生吴世祥吴航常健肖瑶刘帅
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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