The Public Information for Radiation Emergencies Regulations 1992

Regulation 2

SCHEDULE 1 DOSES OF IONISING RADIATION APPLICABLE TO THE DEFINITION OF RADIATION EMERGENCY

PART I DOSE FOR THE WHOLE BODY

1.  The dose for the whole body resulting from exposure to the whole or part of the body, being the sum of the following dose quantities resulting from exposure to ionising radiation, namely the effective dose equivalent from external radiation and the committed effective dose equivalent from that year’s intake of radio-nuclides, shall in the period of one year immediately following the occurrence be 5 mSv.

PART II DOSE FOR INDIVIDUAL ORGANS AND TISSUES

2.  Without prejudice to Part I of this Schedule, the dose for individual organs or tissues, being the sum of the following dose quantities resulting from exposure to ionising radiation, namely the dose equivalent from external radiation, the dose equivalent from contamination and the committed dose equivalent from that year’s intake of radio-nuclides averaged throughout any individual organ or tissue (other than the lens of the eye) or any body extremity or over any area of skin, shall in the period of one year immediately following the occurrence be 50 mSv.

3.  In assessing the dose quantity to skin whether from contamination or external radiation, the area of skin over which the dose quantity is averaged shall be appropriate to the circumstances but in any event shall not exceed 100 cm².

PART III DOSE FOR THE LENS OF THE EYE

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.