Medical Physics Flashcards
1
Q
How do X-rays interact w/ matter via the photoelectric effect?
A
Where an orbital electron is ejected from an atom due to energy gained from incident photon
2
Q
How do X-rays interact w/ matter via Compton Scattering?
A
Where x-ray is scattered via interaction with an orbital electron
3
Q
How do X-rays interact w/ matter via pair production?
A
Where-ray photon interacts with the nucleus of an atom and an electron and positron are produced
4
Q
Acoustic Impedance
A
Product of speed of sound in material and density of material
5
Q
Ultrasound
A
Longitudinal Waves with frequency greater than 20kHz
6
Q
Piezoelectric effect
A
An application of a p.d. across a material / crystal causes an expansion /contraction / vibration
