Exam 1 Flashcards
What is Radiation?
Energy that is transmitted through space or matter.
What is Energy?
Is the ability to get things done
What is Electromagnetic radiation (EMR) ?
Electromagnetic (EM) Energy is primary with the production of an X-Ray
How is EMR energy measured in Electron Volts?
It is in Electron Volts
keV) 1000 eV= 1 kiloelectron volts (keV
How is JUST EMR measured in Frequency?
Measured by frequency in Hertz
What is Frequency?
Frequency is the rise and fall of a sine wave
How do you measure a cycle?
From 1 peak to the next peak (or any other like point)
T/F X-Rays have a Low frequency
FALSE. X-rays have a high frequency
How is EMR measured by wavelength?
It is measured in meters (M)
What is wavelength?
It is the distance between 1 peak of the wave to the next peak
T/F X-Ray has a very short wavelength
TRUE
Does all EMR travel at the speed of light
Yes, all EMR do.
What are Photons
Also called quanta, they have NO mass and travel in BUNDLES (packets)
How to photons travel?
They travel in waveform with varying wavelengths and frequencies
T/F Photons gain intensity with increase in distance.
FALSE. photons LOSE intensity with increase in distance
T/F photons can either be ionizing or non ionizing depending on certain wavelength
TRUE
Can EMR be divided into ionizing and non ionizing radiation
Yes, has enough energy to remove (“knockout”) an electron
How do you remove an electron?
To remove an electron its binding forces must be overcome which is causing imbalance
T/F Ionizing radiation has low frequency and short wavelength
FALSE. Ionizing radiation does have VERY short wavelength, but has HIGH frequency. These are inversely related
Do Short wavelength & High frequency give off high energy?
YES, It gives off high energy.
What is the roentgen abbreviation?
R (Coulumbs/kg abbr. C/kg
