· Stochastic effects:
o Probability of the radiation effects increases with dose
o Cancer (e.g. Leukaemia); genetic effects
o No difference in severity after disease occurs with increasing dose
o No threshold dose below which risk ceases to exist
o Regarded as the principal health risk form low-dose radiation
· Deterministic effects:
o Severity of the injury increases with dose
o Require much higher doses to produce effect
o E.g. Cataracts; erythema; fibrosis; haemopoietic damage
o There exists a threshold below which the effect is not seen
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