FUNDAMENTALS OF PHYSICS OF RADIATION SCIENCE

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FUNDAMENTALS OF PHYSICS OF RADIATION SCIENCE
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REVIEW

• R or C/KG
• Ion pair
• defines electric charge per unit of mass
• quantity of matter in a physical object is mass

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REVIEW

• Rad or ?

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REVIEW

• Rem or ?

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Curie or Becqurel (Bq)

• Quantity of Radioactive material

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Physics

• Removes subjectivity
• Simplifies (No really!)
• Base quantities (mass, length and time)(pg 29)
• Derived Quantities (combination of the base
  quantities
• Special quantities-support measurement of the
  derived quantities

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Units

• Magnitude 100 or 72
• Units cm. or inches

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SYSTEMS OF MEASUREMENTS

• MKS
• CGS
• BRITISH
• SI

• Meter/kilogram/second
• centimeter/gram/second
• feet/pound/second
• extension of MKS derived units and special units
  to represent derived quantities and special
  quantities

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MECHANICS

• OBJECTS AT REST (STATIC)
• OBJECTS IN MOTION (DYNAMIC)
• MOTIONVELOCITY AND ACCELERATION. What is the
  difference?
• Initial velocity, final velocity.
• If velocity is constant the acceleration is
  zero!!!

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Newtons Laws of Motion

• Inertia
• Force
• For every action there is an equal and opposite
  reaction

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WEIGHT

• Force of an object by gravity
• Newtons in SI units
• Pounds in British
• weightmass x gravity

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MOMENTUM

• MASS x Velocity
• Truck rolling down the hill vs skateboarder
  rolling down the hill
• Which will have more momentum? Why?

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WORK/POWER

• PRODUCE OF FORCE AND DISTANCE
• UNIT IS JOULE
• Power- rate of doing work (includes time)
• A radiographer picks up (force)a cassette and
  places into the bucky(distance) in 3 seconds
  (time). This

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ENERGY

• The ability to do work
• May be transformed from one form to another but
  cannot be created or destroyed.
• Mechanical energies used in x-rays
• Kinetic and potential

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HEAT

• IMPORTANT IN RADIOLOGY. WHY?
• HEAT IS KINETIC ENERGY. WHY?
• UNIT OF MEASUREMENT-CALORIE
• CONDUCTION-HOT TOUCHING COLD
• CONVECTION-TRANSFER OF MOLECULES MECHANICALLY
• RADIATION-THERMAL

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THERMAL RADIATION

• TRANSFER OF HEAT BY EMISSION OF INFRARED
  RADIATION. (REDDISH GLOW)
• X-RAY TUBES COOLED PRIMARILY BY RADIATION