(1) For regulation 6, a person's effective dose for a relevant period is the sum of—
(a) the effective doses that the person receives, from external exposure, during the relevant period; and
(b) the person's committed effective dose, received from intakes during the relevant period, for the next 50 years.
(2) However, if the person is under 18 years old, the committed effective dose must be worked out on the basis of the number of years calculated by subtracting the person's age, at the time of the calculation, from 70.
(3) In this regulation:
"relevant period" means—
(a) for a person subject only to public exposure—1 year; or
(b) for a person subject to occupational exposure—5 years.