Radiation Safety Flashcards
What are the two types of biological effects of radiation?
Deterministic and non deterministic
Those biological effects that WILL occur are known as?
Deterministic effects
Those biological effects that we know MAY occur are known as?
Non deterministic
Which type of biological effect of radiation has a threshold dose? Deterministic or non-deterministic
Deterministic
Define somatic effects
Those suffered by the exposed person
What type of deterministic effect can be more aggressive and traumatic, acute or chronic?
Acute
What biological effects of radiation occur at random, due to chance or probability?
Non deterministic effects
Which type of effects are we likely to have in dentistry?
Non deterministic
What are the three main factors affecting dose of radiation?
Type of radiation
Tissues being irradiated
Age of the patient
What is the typical effective dose of radiation for bitewings/periapicals?
0.0003-0.022 mSv
What is the dose limit for the public? Value that should not be exceeded
1 mSv
What is the principle used to manage safe dose limits for dental patients?
ALARP
What does ALARP stand for?
As
Low
As
Reasonably
Practicable
What film speed will reduce the risk of developing fatal malignancy?
F speed ( very fast)
The number of “photons” in a beam at a specific place represents…
Intensity of x-ray beam
What is the intensity of radiation proportional to?
1/ distance (squared)
What does the size of the controlled area depend on?
KV of the x-ray machine
If x-ray machine produces 70kV, what will the size of the controlled area be?
1.5m
What does the plastic barrier wrapped around film do?
Protects film from saliva and is good for infection control
