Dental Radiology NBDHE Verified Solutions - Wilhelm Roentgen discovered x-rays in 1895 while experimenting with a cathode ray tube. - Ionization refers to the process of producing ions, where an atom gains or loses an electron, becoming
electrically unbalanced. - An ion pair is formed when ioniza...
Dental Radiology NBDHE Verified Solutions
- Wilhelm Roentgen discovered x-rays in 1895 while experimenting with a cathode ray tube.
- Ionization refers to the process of producing ions, where an atom gains or loses an electron, becoming
electrically unbalanced.
- An ion pair is formed when ionization occurs: the atom loses an electron (forming a positive ion) and
the ejected electron becomes a negative ion.
- Ionizing radiation is capable of producing ions by removing or adding electrons to atoms. X-rays are a
form of ionizing radiation, which can cause ionization.
- Particulate radiation consists of tiny, mass-carrying particles that travel in straight lines at high speeds.
Examples include electrons, beta particles, alpha particles, neutrons, and protons.
electromagnetic radiation ✔️the propagation of wave-like energy (without mass, without particles)
through space or matter
cosmic rays
x-rays
microwaves, radio waves
gamma rays
,ultraviolet rays
visible light
we want--short wavelength, high frequency
velocity ✔️the speed of a wave
wavelength ✔️the distance between the crest of one wave to the crest of the next wave
frequency ✔️the number of wavelengths that pass a point in a certain amount of time
X-ray ✔️electromagnetic ionizing radiation of VERY SHORT WAVELENGTH resulting from the
bombardment of tungsten by highly accelerated electrons in a vaccum
properties of X-radiation ✔️1. x-rays have a wave form; xrays travel in waves with short wavelengths
and high frequency
, 2. x-rays travel at the speed of light (186,000 miles/second)
3. x-rays have the power to penetrate substances
4. X-rays are invisible
5. x-rays have no mass, no weight and no charge
6. x-rays are absorbed by matter
7. x-rays exert an effect on living tissue; x-rays are able to stimulate or destroy living cells
8. x-rays lose intensity with distance; x-rays travel in straight lines and cannot be focused to a point
The x-ray tube ✔️1. protective leaded glass housing
tube enclosure with all the air removed; shielding prevents radiation leakage
high vacuum glass tube surrounded by refined oil with high insulating powers; the oil helps to absorb
excess heat
2. Cathode
3. Anode
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