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  • Module 6: Particles and Medical Physics
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Summary OCR A level Physics A 6.5 Medical Physics

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2021/2022 Written for academic year
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Module
Module 6: Particles and Medical Physics
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Summary notes for topic 6.5 Medical physics covering X-rays, X-ray scattering, gamma camera, CAT scans, PET scans, Ultrasound, Doppler imaging, acoustic impedance. Notes feature definitions, highlighted key terms, explanations, diagrams and equation break downs.

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6.5 Medical
Physics

, ✗ rays -




•

Can be plane polarised
•

Diffracted by atoms in
crystals
Short ( 10-8-10 -13m)
wavelength
•




•

Electromagnetic waves -
travel at speed of light
Photons have 10-10000 than visible
more
energy light photons
•
×

•

Harmful to living cells /used for cancer treatment
•
cathode acts as a heater and
produces electrons by thermionic emission
•
electrons accelerated through evacuated
tube towards the anode by large p d- .




•
anode made from a target metal with
a high melting point e.
g. tungsten
X
ray photons produced when electrons
• -




are decelerated by hitting the anode
oil is circulated around the 1% of the
energy output of photons is
• <


kinetic
anode to cool it
energy of the electrons
anode is rotated to spread the heat
anode is shaped to deflect the photons
in the desired direction
through a
window
tobe tired with lead to shield the
X-ray
radiographer from Krays emitted in other
directions


One electron releases one X
ray photon Therefore from the principle of
-
.



,



conservation of energy :




maximum energy of X-ray photon =
maximum kinetic
energy of electron

✗
¥ er
÷
=
✗

Document information

Study Level
A/AS Level
Subject
Physics A
Uploaded on
June 28, 2022
Number of pages
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Written in
2021/2022
Type
Summary
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Browse related subjects

Subjects

  • medical
  • x ray
  • gamma camera
  • cat scan
  • pet scan
  • doppler imaging
  • attenuation coefficient
  • ultrasound
  • acoustic impedance
  • compton scattering

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