X-ray production Flashcards
X-ray production occurs when…
The current inside the x-ray tube flows from the cathode and is suddenly stopped at the annode.
More than ____% of electrons’ energy is converted to ____; less than ____% is converted to x-ray.
More than 99 % of electrons’ energy is converted to heat; less than 1 % is converted to x-ray.
How is heat produced in the production of x-rays?
Heat is produced when the projectile electrons strike the outer shell electrons of the target material and placed them in an excited state, which causes them to emit infrared radiation
How are Brems radiation produced?
X-ray produced by slowing of incoming electrons by the target atoms; slowing releases energy in the form of x-ray
How are charateristic radiation produced?
X-rays produced when incoming electrons at the anode dislodge orbital electrons from the target material, and outer shell electrons fall in to fill the hole created, this movement releases energy in form of an x-ray
At diagnosic levels most x-rays produced are from ____ interactions?
Brems
X-ray properties
- Highly penetrating
- Invisiable
- Travel at the speed of light
- Travel at straight lines as waves
- Have diagnostic wavelength of 0.1 to 0.5 angstroms
- Travel as bundles of energy called photons
- Ionize matter
- Can cause fluorescence
- Electrically neutral
Wavelength
Distance from crest to crest or trough to trough of a sine wave
Frequency
Number of waves passing a given point per unit time
As wavelength increases, frequency _____.
Decreases
X-ray emission spectrum
Collection of all different energies (wavelengths) of a typical x-ray beam
Beam filtration
Removes long-wavelength x-ray (low energy x-rays)
Total filtration must be how thick?
2.5mm aluminum equivalent
Heat units
Calculation of the total heat produced during an x-ray exposure
