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Transcript of Medical Physics
1 Human Energy
2 Human Power
4 Harmful radiation
6 Reflection and Refraction
8 An Introduction to Pulse Oximetry
10 Heart Electricity
12 PET Scans
16 Ethical issues
Work = Force x Distance moved in direction of force
Units: Joules/J or Newton meters/Nm
Power = work done/time taken
3 Radiating Energy
When we absorb radiation, the amount received is the
Joules per kilogram
Ionising radiations differ in the way in which they affect biological materials.The unit which incorporates both the energy and the biological harm is the
, or the
millisievert (1Sv = 1000 mSv)
. It is known as the
Cancer is caused by abnormal cell growth. This can result in a
are not cancerous.
Radiotherapy can be used to treat or control cancer. When treatments cannot destroy the cancer they may be able to control the symptoms of cancer. This is known as
Radiation Therapy (Part 1)
Radiation Therapy (Part 2)
An insight into Radiotherapy
The Inverse Square law
Inverse Square Law (Beginners' Guide)
Radiation Dose (Part 1)
Radiation Dose (Part 2)
Alpha, Beta, Gamma Radiation
What is radioactive Decay?
9 Pulse Oximetry and Oxygen
11 Reading ECGs
The momentum of an object is its mass times its velocity so is a vector quantity. It is measured in
kilogram metres per second (kgm/s)
Introduction to Momentum
New medical techniques bring with them ethical issues such as the money spent on a PET scanner and cyclotron to produce the radioisotopes could provide kidney dialysis for 60 patients for 5 years.