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FUNDAMENTALS OF PHYSICS OF RADIATION SCIENCE. REVIEW. R or C/KG Ion pair defines electric charge per unit of mass quantity of matter in a physical object is mass . REVIEW. Rad or ? . REVIEW. Rem or ?. Curie or Becqurel (Bq). Quantity of Radioactive material . Physics.
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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
REVIEW Rad or ?
REVIEW Rem or ?
Curie or Becqurel (Bq) Quantity of Radioactive material
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
Units • Magnitude 100 or 72 • Units cm. or inches
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 SYSTEMS OF MEASUREMENTS
MECHANICS • OBJECTS AT REST (STATIC) • OBJECTS IN MOTION (DYNAMIC) • MOTION—VELOCITY AND ACCELERATION. What is the difference? • Initial velocity, final velocity. • If velocity is constant the acceleration is zero!!!
Newton’s Laws of Motion • Inertia • Force • For every action there is an equal and opposite reaction
WEIGHT • Force of an object by gravity • Newtons in SI units • Pounds in British • weight=mass x gravity
MOMENTUM • MASS x Velocity • Truck rolling down the hill vs skateboarder rolling down the hill • Which will have more momentum? Why?
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
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
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
THERMAL RADIATION • TRANSFER OF HEAT BY EMISSION OF INFRARED RADIATION. (REDDISH GLOW) • X-RAY TUBES COOLED PRIMARILY BY RADIATION