scanning electron microscope

Scanning electron microscopy is based on the interaction of electrons and matter. When a beam of high-energy electrons strikes the surface of a substance, the excited region will produce secondary electrons, Auger electrons, characteristic x-rays and continuum X-rays, backscattered electrons, transmitted electrons, and visible, ultraviolet, and infrared. Electromagnetic radiation generated in the light region. At the same time, electron-hole pairs, lattice vibrations (phonons), and electron oscillations (plasma) can also be generated. In principle, the interaction of electrons and matter can be used to obtain information on various physical and chemical properties of the sample itself, such as morphology, composition, crystal structure, electronic structure, and internal electric or magnetic field. Basic Information Specialist Category: Inspection Category: Microscopy Applicable gender: whether it is fasting: Tips: Maintain a normal diet and sleep. Normal value The image has a wide range of magnification and a high resolution. It can be magnified ten times to several hundred thousand times, and it basically includes the magnification range from a magnifying glass, an optical microscope to a transmission electron microscope. The resolution is between the optical microscope and the TEM, up to 3 nm. Clinical significance Abnormal results are medically applied as long as they are applied to the examination of viruses and blood. Scanning electron microscopy is mainly used to observe the microscopic and submicroscopic structure of the tissue, cell surface or fracture surface and the surface morphology of large granular samples (3nm ~ 10nm) to find the diseased furnace. People who need to be tested for viral infections or cancer patients can be examined, and other diseases are also examined. Precautions Inappropriate crowd: generally not. Taboo before the test: maintain a normal diet and sleep. Requirements for inspection: According to the doctor's instructions, take samples and actively cooperate with the doctor. The doctor should carefully observe the field of view under the microscope. Inspection process The inspection process is generally to collect samples, and then the specimens are produced. The doctor observes the cells with a scanning electron microscope for a certain period of time, and then obtains images for analysis.