Meter(m) – is the   distance measured from the pole to the equator divided into 10,000,000   equal units.   Each unit was given the name meter (old definition)

Electron Volt (ev) – is the   amount of energy that an electron will gain if placed inside a potential   difference of one volt (the speed that an electron will gain as it crosses a   one volt potential difference)

Roentgen (R) – is the amount of   ionization that takes place in a known volume of air.   Measuring the   charge will give you the value of the Roentgen which is 2.58 x 10 -4   coulombs / kilogram of air.

Rad – Radiation Absorbed Dose in   matter.   The defenition of the rad is the amount of energy absorbed   per gram of matter 9old unit) which is 100 ergs / gram of matter.

Gray (Gy) – the new unit for   absorbed dose in matter.   The amount of energy absorbed per kilogram   of matter which is 1 joule / kilogram of matter.   (1 Gy = 100 rads.)

Rem – (radiation protection)   Radiation Equivalent Man. Rad x quality factor = rem

Sievert (Sv) – new   unit for radiation protection.   Gy x quality factor = Sv.   (1Sv   = 100 rem)

circumference – boundry line of a circle.   c = 2Pr   or   c = Pd

radius – is a straight line segment that joins the center of a circle with any point on its circumference.

diameter -  a straight line segment passing through the center of a figure, especially of a circle or sphere, terminating at the periphery

area(A) of a circle : A = Pr2

area of a triangle : A = 1/2 (ab)

Sin < a   =   a/c   =   opposite/hypotenuese

Cos < a =   b/c   =   adjacent/hypotenuese

Tan < a =   a/b   =   opposite/adjacent

Cathode rays – streams of electrons in a gas tube

fluorescence – emission of electromagnetic radiation, especially of visible light, stimulated in a substance by6 the absorption of incident radiation and persisting only as long as the stimulating radiation is continued.

Bremsstrahlung (braking radiation) – the production of x-rays by the interaction of high speed electrons and the nucleus of an atom.

thermionic emission – heating of the filament to boil off electrons

  step-up transformer – takes low voltage and makes it high voltage

rectifier – transforms AC voltage into DC (most of the wave is utilized)

ripple – variation in DC voltage (becomes less with a multiple phase pulse)

rotating anode – By rotating the anode the effective area which the electrons bombard is increased which then dissipates the heat produced more efficiently.

KvP (kilovolt potential) – is the voltage applied across the x-ray tube.

EV (electron volt) – is the amount of energy an electron will gain if it passes through a potential difference of 1 volt. (1KvP = 1KeV)

energy – is the ability to do work