Basic Physics Concepts Flashcards
What is the basic unit of energy?
electron-volt is also commonly used in radiology
What is the basic unit of electric charge?
What is the basic unit of power?
what is the basic unit of absorbed dose of ionizing radiation?
What is a Gray [Gr]?
The basic unit of absorbed dose of ionizing radiation
What is a sievert?
A unit for the ‘health effect of ionizing radiation on the human body’.
Are x-rays higher or lower frequency than visible light?
In electromagnetic radiation, how are the directions of these fields related to each other:
- magnetic field
- electric field
- the direction of propagation/ movement?
They are all at 90 degrees to each other
What is an electron-volt [eV]
The quantity of (kinetic) energy an electron would have if accelerated over 1V.
Equivalent to 1.6 x10^19 J
What is the difference between Gamma rays and X-rays?
Gamma rays are produced in the nucleus by nuclear de-excitation
X-Rays are produced in the atomic shell by atomic de-excitation
When talking about the characteristic of different elements/ atoms, what do the letters ‘Z’ and ‘A’ normally refer to?
Z = atomic number = number of protons A = mass number = number of protons + number of neutrons
Which electron shell is on the inside of an atom?
the k shell
In X-ray production:
Is the cathode or anode the filament or target?
Cathode = filament Anode = target
What are typical voltage difference between the filament and the target in x-ray production?
What are the two types of radiation produced in x-rays?
Continuous radiation (Bremsstrahlung radiation) Characteristic radiation