# The Public Information for Radiation Emergencies Regulations 1992, Paragraph 4


The dose for the lens of the eye resulting from exposure to ionising radiation, being the average dose equivalent from external and internal radiation delivered between 2.5 mm and 3.5 mm behind the surface of the eye, shall in the period of one year immediately following the occurrence be 15 mSv.

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Source: https://www.legislation.gov.uk/uksi/1992/2997/schedule/1/paragraph/4 (the official version)
Page: https://openlegislation.uk/public-information-for-radiation-emergencies-regulations-1992/schedule-1/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.