NEA Mandates and Structures


Expert Group on the Dose Limit for the Lens of the Eye (EGDLE)

Chair(s): Secretary:  Jacqueline GARNIER-LAPLACE
(jacqueline.garnier-laplace@oecd-nea.org)
Member(s):All NEA member countries
Full participant(s): European Commission
Under the NEA Statute
Observer(s)(International Organisation): International Atomic Energy Agency (IAEA)
By agreement
Date of creation:29 March 2019
End of mandate:29 March 2021

Mandate (Document reference):

Mandate (Document extract):

Extract of document NEA/CRPPH(2018)4

Background

Radiation exposure to the lens of the eye, above a threshold dose, has been linked to its opacification (or clouding of the lens, which, in its advanced stages, is referred to as a cataract). In order to prevent this effect, dose limits have been defined for the lens of the eye.

On 21 April 2011, the International Commission on Radiological Protection (ICRP) issued a formal statement indicating that tissue reactions for the lens of the eye have dose thresholds that are, or might be, lower than previously considered.[1] This statement indicated the threshold for absorbed dose was now considered to be 0.5 gray. For occupational exposure in planned situations, the ICRP therefore recommended an equivalent dose limit for the lens of the eye of 20 mSv in a year, averaged over defined five-year periods (i.e. 100 mSv/5 years), with no single year exceeding 50 mSv. The ICRP did not change its recommended dose limit for the lens of the eye for members of the public.

In 2012, the ICRP reinforced its recommendation in relation to the dose limit to the lens of the eye when it released ICRP Publication 118, ICRP Statement on Tissue Reactions/Early and Late Effects of Radiation in Normal Tissue and Organs – Threshold Doses for Tissue Reactions in a Radiation Protection Context.[2] 

The IAEA also incorporated these ICRP recommendations into Schedule III of the General Safety Requirements Part 3, Radiation Protection and Safety of Radiation Sources: International Basic Safety Standards.[3] Similarly, the new recommendations was incorporated in the European Union legislation with the Council Directive 2013/59/Euratom of 5 December 2013 laying down basic safety standards for protection against the dangers arising from exposure to ionising radiation.[4]

In alignment with the recommendations of the ICRP, some regulators, such as the Canadian Nuclear Safety Commission (CNSC) have proposed to amend the equivalent dose limit for the lens of an eye in their regulations. In response, some stakeholders, e.g nuclear licensees, have identified the proposed revisions to the equivalent dose limit for the lens of an eye as a significant issue. Stakeholder concerns included:

To address these concerns, some regulators, e.g. the CNSC, and international fora, i.e. the International Radiation Protection Association (IRPA) and the Information System on Occupational Exposure (ISOE) have undertaken a series of initiatives to address these concerns. The Committee on Radiological Protection and Public Health (CRPPH) has recognised that there are aspects that regulators and stakeholders worldwide could benefit in learning from other countries that already implemented the ICRP-recommended equivalent dose limit for the lens of the eye, to ensure that additional efforts are strategic and optimised. There are a number of resources available regarding perspectives on the science behind the ICRP’s recommendation and guidance on hazard/risk assessments; however, the sharing of experiences on the practicality of implementing the recommendation, including successes and challenges, is an aspect that may benefit regulators and stakeholders.

Objectives

The main objective of the EGDLE is to provide an opportunity for regulators and stakeholders, e.g. nuclear licensees, to share lessons learned (both successes and challenges) in the practical implementation of the ICRP’s recommended equivalent dose limit for the lens of the eye for occupational exposures.

The Expert Group on the Dose Limit for the Lens of the Eye (EGDLE) supports the CRPPH mandate, which states: “the Committee shall … promote international collaboration on specific radiological protection and radiation-related public health topics of interest to the NEA member countries in the framework of the NEA Strategic Plan” [NEA/NE(2017)13].

Methods of Working

Interactions

The EGDLE will interact, as appropriate, with other NEA standing technical committees, as well as with national and international organisations and fora, such as the ICRP, IAEA, European Commission, IRPA, and ISOE, in order to apply the right expertise to the right issues and avoid duplicating efforts.

Deliverables

The deliverables of the EGDLE will include:

 


[1] The 2011 ICRP Statement is available at: www.icrp.org/docs/2011%20Seoul.pdf.  

[2] The ICRP Publication 118 is available at: www.icrp.org/publication.asp?id=ICRP%20Publication%20118

[3] The International Basic Safety Standards are available at: www-pub.iaea.org/MTCD/Publications/PDF/Pub1578_web-57265295.pdf.

[4] The Council Directive 2013/59/Euratom is available at: https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX%3A32013L0059.