Question

Regarding workers and dose limits:

a. The dose limit for carers is the same as for the public

b. Trainees under the age of 18 must not receive an effective dose of more than 6 Sv

c. Workers must be designated as classified if their annual dose limit exceeds 20 mSv

d. Classified workers must be over 18 years of age

e. It is mandatory to monitor the dose of all staff members who work with radiation

Answer 1

a. False. The IRR99 permits the dose limit to be relaxed for carers who are willingly exposed to doses higher than the limits set for the public.

b. False. A non-classified worker (trainee) under the age of 18 should not receive a dose more than 6 mSv, not 6 Sv. Millisieverts (mSv) is commonly used to measure the effective dose in diagnostic medical procedures (1 mSv = 103 Sv).

c. False. Workers are designated as classified if their annual dose limit exceeds 6 mSv. The effective dose limit for classified workers is 20 mSv.

d. True. Classified workers must be over 18 years of age and certified as being medically fit, prior to employment, to work as a classified person.

e. False. The IRR99 makes it mandatory to monitor the dose of classified workers only. In practice, the employer monitors the majority of staff working in a controlled area to monitor and keep dose limits within acceptable limits.