10/8: Radiation Protection Flashcards
What are the goals of an OMFS oral surgeon?
- Reduce Radiation exposure
- Maintain a high degree of diagnostic efficiency
What does “ALARA” stand for?
As low as reasonably achievable
What does “ALADA” stand for?
As low as Diagnostically acceptable
What is mandated for the tube-head?
Filtration
Collimator
This allows a selective passage of content through a specified substance
Filtration
Filtration removes what?
Low kEV
Filtration does what to the energy of the beam
Increases mean energy
What filtration sizes are required for kV?
<50 kV → 0.5mm
50-70 → 1.5mm
>70 → 2.5mm
What is the maximum diameter of collimation?
2.75” diameter
What shape is recommended for a collimator?
Rectangular
What is optional for the x-ray tubes?
Rectangular collimator
High kV
Direct DC
Increased focal length
Area exposed is related to the
Maximum size of the beam
Why do you want a high kV?
Lower dose → heavier unit
Why do you want constant DC potential?
Constant energy, lower exposure time
What are the benefits of increased focal length?
Less head volume
Reduced effective dose
Sharper image
What practice options can you have?
Film
Lead thyroid collar
Film-holding device
Time-temp quality
What kind of films are there?
D
E
F
Digital receptors
What do you use for patient protection during radiographs?
Lead apron
Thyroid collar
What is recent research saying about patient shielding?
It is useless
Should you avoid holding the receptor?
Yes
Where should you stand when taking an x-ray?
Behind barrier, 6 feet away, 90-135 degrees to the beam
What should be worn by full-time operators of radiographic equipment?
Dosimeter badge
The annual occupational whole body exposure should not exceed
50 mSv
Nomad violates ______, unless ______
- Current regulations
- Backscatter shield is permanently mounted
