radiation protection Flashcards
What are the International Commission on Radiation Protection’s 3 principles of dose limitation?
- Justification
- Optimisation
- Limitation
How often should a child with high caries risk have BW taken?
Every 6 months.
How often should a child with moderate caries risk have BW taken?
Every year.
How often should a child with low caries risk have BW taken?
Every 12-18 months in primary dentition.
Every 2 years with permanent dentition.
For an adult with high caries risk, how often should BW be taken?
Every 6 months.
For an adult with moderate caries risk, how often should BW be taken?
Every year.
For an adult with low caries risk, how often should BW be taken?
Every 2 years.
Why is a high voltage (70kV) used to optimise the X-ray beam?
Because high energy x-rays penetrate through the patient (less exposure to more harmful wavelengths).
What type of collimation should be used to optimise?
Rectangular
What element is used to filter the x-ray beam?
Aluminium
What type of potential is needed to produce a constant current?
Constant potential.
How does rectangular collimation optimise the x-ray beam?
It reduces the dose by 45% and fits the shape of the film.
How many cm is the legal requirement of focus to skin distance?
20cm
Which form of protection is not justified in dental radiography?
Lead aprons.
During which dental view would a lead apron be recommended in a pregnant patient?
Vertex occlusal (but this is rarely performed and can be replaced by other views).
