What is the principle of X-ray fluoroscopy and what is the principle of X-ray photography?

X-rays are invisible electromagnetic waves that propagate in straight lines in a uniform isotropic medium

X-rays are not charged and are not affected by external magnetic fields or electric fields

< p>Penetration X-rays have short wavelengths and high energy

High-energy substances absorb them weakly and therefore have strong penetrating ability

Fluorescence After certain substances are irradiated by X-rays Can excite visible fluorescence

Ionization X-ray photons with sufficient energy can hit orbital electrons in atoms

causing them to break away from the atom to produce primary ionization. There are still enough electrons that are knocked off Energy deionizes more atoms

Thermal X-rays are absorbed by substances and eventually most of them will be converted into heat energy, causing the temperature of the object to rise

Photosensitive X-rays are the same as visible light It also has photochemical effects.

Photosensitivity of film emulsions can cause photochemical effects on many substances.

Coloring effects. Some substances, such as lead, glass, crystal, etc., will form color after long-term and large-dose exposure to X-rays.

The gradual change of color when crystals fall off is called coloration or dehydration