The Design of Diagnostic Medical Facilities where ... - ResearchGate

Appendices
Appendix A: Dose limits
The Dose Limits prescribed in Schedule 2 of S.I. No. 125 of 2000 are reproduced in Table A.1 below. Effective
and Equivalent Limits are provided for occupationally exposed workers, pregnant workers, apprentices and
members of the public who are not occupationally exposed. The latter group include, for example, hospital
staff that are not designated as radiation workers. This would include administrative staff and non-radiological
nursing and medical staff.
Table A.1: Dose Limits for categories of workers and all others, reproduced from S.I. No. 125 of 2000
Exposed Workers 1
(including Apprentices and
Students aged 18 years or over)
Dose to the foetus of a
pregnant worker
Effective dose limit
20 mSv in a period of 12
months.
1 mSv after declaration of
pregnancy.
Equivalent dose limits (in a
period of 12 months)
Lens of the eye: 150 mSv
Skin (averaged over an area of
1 cm 2 ): 500 mSv
Hands, forearm, feet and
ankles: 500 mSv
Apprentices and Students
aged 16 years or more but
less than 18 years
Members of the Public
(Including apprentices and
students under the age of 16)
6 mSv in a period of 12 months. Lens of the eye: 50 mSv
Skin (averaged over an area of
1 cm 2 ): 150 mSv
Hands, forearm, feet and
ankles: 150 mSv
1 mSv in a period of 12 months. Lens of the eye: 15 mSv
Skin (averaged over an area of
1 cm 2 ): 50 mSv
1
An exposed worker is any person, either self employed or working for an employer, who is liable to receive an exposure resulting in a
dose which exceeds one or more of the dose limits for a member of the public.
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The Design of Diagnostic Medical Facilities where Ionising Radiation is used