Question

Which is not attractive features of scanning electron microscope?

Answer 1

The disadvantages of a Scanning Electron Microscope start with the size and cost.

SEMs are expensive, large and must be housed in an area free of any possible electric, magnetic or vibration interference.

Maintenance involves keeping a steady voltage, currents to electromagnetic coils and circulation of cool water.

Special training is required to operate an SEM as well as prepare samples.

The preparation of samples can result in artifacts. The negative impact can be minimized with knowledgeable experience researchers being able to identify artifacts from actual data as well as preparation skill. There is no absolute way to eliminate or identify all potential artifacts.

In addition, SEMs are limited to solid, inorganic samples small enough to fit inside the vacuum chamber that can handle moderate vacuum pressure.

Finally, SEMs carry a small risk of radiation exposure associated with the electrons that scatter from beneath the sample surface.

The sample chamber is designed to prevent any electrical and magnetic interference, which should eliminate the chance of radiation escaping the chamber. Even though the risk is minimal, SEM operators and researchers are advised to observe safety precautions.