本文介绍了应用X射线衍射仪测定矿山呼吸性粉尘中游离二氧化硅含量的基本原理、实验条件以及操作过程、方法步骤等。
Basic principle, experiment condition, operating process, method and steps of X-ray diffraction method to determine free silica content of respirable dust in mines are introduced in this paper.
磁振造影可应用于检查所有组织，其检查过程为非侵入性，没有副作用又无游离性放射线暴露，所以被普遍的使用。
MRI can be used in all kinds of tissue. Because the process is non-invasive and free of ionization radiation, it has been widely used.
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