Lossless screening system for lunar dust particle sample and screening method of lossless screening system

Abstract

The invention belongs to the field of sample screening of geology and planetary science, and relates to a lossless screening system for lunar dust particle samples and a screening method of the lossless screening system. According to the method, multiple layers of screens with different particle sizes are combined with a titration method to carry out lossless screening on a lunar dust particle sample, finer lunar dust particles continue to be screened according to the diameters of the screens, and the lunar dust particles are numbered and stored according to the diameters of the screens; and storing the last-stage sieved sample in the solution or sucking the sample solution by using a liquid dropping device and then dropping the sample solution on a sample table or in other containers for subsequent analysis. The method is simple and efficient and has few steps; as a solution titration method is adopted, electrostatic adsorption on a screen and a vessel during sieving is avoided, and almost no loss exists; the particle size is easy to control, and a good screening effect is ensured by using a microscope for observation; and the adopted method has no influence on surface structures, rare gas components, magnetics and other physicochemical properties of the samples, and screening of moon dust samples with different particle sizes is well achieved.

Description

technical field [0001] The invention belongs to the field of sample screening of geological and planetary sciences, and relates to a non-destructive screening system and a screening method for lunar dust particle samples. Background technique [0002] Planetary and space science is gaining more and more attention. However, many of the particle sizes of lunar dust samples and asteroid sampling samples are at the micron level, for example, the average size of lunar dust samples is ~70 μm; the Itokawa asteroid Itokawa particle samples collected by Japan’s Hayabusa are between 30 and 180 μm. During this period, the study of these samples is of great significance for exploring the formation and evolution of the solar system and the evolution process of the planetary system. However, due to the preciousness of the samples, the amount of sampling is very small, and particles of different sizes have different properties. For example, the smaller the size of the moon dust samples, t...

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Problems solved by technology

However, due to the preciousness of the samples, the amount of sampling is very small, and particles of different sizes have different properties. For example, the smaller the size of the moon dust samples, the stronger the solar wind radiation, and their physical and chemical properties will be different. Therefore, the returned samples need to be sampled. Subsequent experimental analysis can only be carried out after particle size sieving. However, there is still a lack of relevant experimental technology methods in China at present.

In foreign countries, due to advanced rocket technology, more samples are collected, and a relatively rough method of direct sieving with a sieve (dry sieving) is adopted, but there are some problems, mainly including (1) the particle size of the moon dust is relatively fine, so direct sieving (2) It is not easy to sieve the second time, and the particles are easy to adhere to the container wall; (3) The particle samples are bonded to cause the sieved particles of different particle sizes to be different from the actual size. The error is large, the screening effect is not good, etc.

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