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Partial Notes on Radiologic Physics 2



  • has mass and energy equivalence and may also have electric charges
  • Electrically neutral which means, in the entire universe the total number of positive charge is equal to the total number of negative charge.


  • derived from the word electricity
  • Can be created by contact, friction and induction
  • Due to the movement of negative electric charges.

• The primary function of x-ray tube is to convert electric energy to EMR or x-rays.

Two Studies of Electric Charges

  1. Electrostatics- the study of electric charges in stationary form.
  2. Electrodynamics- the study of electric charges in motion.

Four Fundamental Properties of Matter

  1. Mass
  2. Form
  3. Energy equivalence
  4. Electric charge

2 Units of Electric Charges

  1. electrons- the smallest unit of electric charge.
  2. proton- positively charge particle.

● Earth- huge reservoir for stray electric charge.


Four Electrostatics Law

  1. Unlike charges attract, like charges repel.

● Electrostatic Force- the force of attraction between unlike charges or repulsion between like charges which is due to the electric field.

2. Coulombs’ Law- states that electrostatic force is directly proportional to the product of the electrostatic charges and inversely proportional to the distance between them.

3. Electric Charge Distribution- states that electric charge distribution is uniform through out or on the surface.

4. Electric Charge Concentration- states that electric charges are concentrated along the sharpest curvature of the surface.


  • Is also known as electricity

Electric Current - the flow of electron and occurs in many types of objects.

Conductors and Insulators

  • Conductor- is a substance through which e- flow easily
  • Insulator- any material that does not allow the flow of e- or inhibits the flow of electrons

Semi- conductors

  • possesses two properties of a conductor and insulator.


  • the property of the material to exhibits no resistance below a critical temperature.

Four Electric States of Matter

  1. Superconductors- possesses no resistance to electron flow (niobium and titanium)
  2. Conductor- it obeys Ohms’ Law and requires a voltage (copper and aluminum)
  3. Semi-conductor- can be conductive and can be resistive (silicon and germanium)
  4. Insulators- do not permit e- flow (glass and rubber)

● 1 ampere= 1 flow of e-/sec

Related Posts:

  1. Partial Notes on Radiologic Physics 2 Part II
  2. Partial Notes on Radiologic Physics 2 PART III


The author is a Radiologic Technologist, currently in the academic field, hoping to mold and produce future Radiologic Technologists who will be theoretically and technologically competent.

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