Unit 1: Fundamentals of Radiological Science

foot

meter (m) - length

pound (lb)

kilogram (kg) - mass

second

second - time

farenheit (f)

kelvin (K) - temperature

electrical current

Ampere (A)

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Kilo, Hecto, Deka, base, deci, centi, milli

Measures radiation intensity

SI: Coulomb/kilogram (C/kg)

roentgen (R)

Measures energy transferred into air

Gray to air (Gya)

Measures amount of radiation energy absorbed by patient

SI: Gray (Gy)

Rad

Measures equivalent dose & biological effect based on absorbed radiation for employees

SI: Sievert (Sv)

Rem

Occupational dose limit

40 mSv (5 rem)

Measures radioactivity

SI: becquerel (Bq)

curie (Ci)

1 rad =

1 rad = .01 gray

1 rem =

1 rem = 0.1 Sv

SI to traditional units you should ____ by 0.1

Divide

Traditional units to SI you should ____ by 0.1

Multiply

Measures how fast an object travels

V = d/time

SI: meter/second (m/s)

Acceleration - the rate at which velocity changes over time

A = Vf-Vo/time

SI: m/s²

Force - the push or pull of an object

F = mass x acceleration

SI: Newton (N)

Weight - the force of gravity acting on an object

SI: Newton (N)

Work or energy - applying force to move an object over a distance

SI: Joule (J)

Power = The rate of doing work

SI: Joule/second = watt (W)

An object will remain at rest or will continue to moving unless acted on by an external force

1. Inertia

The force acted on an object with acceleration is equal to the mass times the acceleration

2. Force

For every action, there is an equal and opposite reaction

3. Action/Reaction

The ability to do work

Energy, X-ray photon is measured in electron volts (eV)

The transfer of thermal energy caused by random motion of molecules

Heat Transfer

The transfer of heat energy by direct contact from one object to another

Conduction

Transfer of heat through liquid and gases by moving molecules via currents

Convection

Transfer of heat energy through space by electromagnetic waves (no contact, no molecules required)

Radiation