Webinars on lens of the eye
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In order to prevent opacification (or clouding of the lens), which, in its advanced stages, is referred to as a cataract, dose limits have been defined for the lens of the eye. In April 2011, the 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. The ICRP therefore recommended a reduction in the equivalent dose limit for the lens of the eye to 20 mSv in a year, averaged over defined five-year periods (i.e., 100 mSv/5 years), with no single year exceeding 50 mSv. This recommendation is for worker exposure; the ICRP did not change its recommended dose limit for the lens of the eye for public exposures.
In alignment with the ICRP's recommendations, the CNSC discussion paper DIS-13-01, Proposals to Amend the Radiation Protection Regulations, proposed to:
- change the equivalent dose limit for the lens of an eye for a nuclear energy worker from the current limit of 150 mSv to 50 mSv in a one-year dosimetry period
- add a new dose limit of 100 mSv in a five-year dosimetry period (for the lens of an eye for a nuclear energy worker)
In 2018, the CNSC and the Canadian Radiation Protection Association (CRPA) co-hosted two webinars, bringing together experts to discuss topics related to radiation dose limits for the lens of the eye.
Webinar #2: September 27, 2018
Implementation of the International Commission on Radiological Protection (ICRP) Dose Limits for the Lens of the Eye
The Canadian Nuclear Safety Commission (CNSC) and the Canadian Radiation Protection Association (CRPA) hosted a webinar on September 27, 2018 on the implementation of ICRP dose limits for the lens of the eye. It presented expert opinions and perspectives behind the implementation of dose limits.
Dr. Claire Cousins, Chair, International Commission on Radiological Protection, BMed Sci, BM BS, FRCP, FRCR, FSRP
What the Eye Doesn't See (PDF 1045 kB)
Marie-Claire Cantone, University of Milan, professor of Applied Physics at the Faculty of Medicine, Dept. Biomedical, Surgical and Dental Sciences
Results of the survey on the view of the IRPA professionals (PDF 2426 kB)
Ross Beveridge, Senior Radiological Protection Consultant, Atkins
Eye dose limit reduction – the impact on operational RP? (PDF 533 kB)
Andrei Hanu PhD, Senior Scientist, Bruce Power Nuclear Generating Station
Assessment of radiological hazard and occupational dose to the lens of the eye at the Bruce Power Nuclear Generating Station (PDF 1853kB)
Jovica Atanackovic, PhD, Senior Scientist, Ontario Power Generation
Evaluation of Eye Lens Dosimetry at CANDU Power Plants (PDF 1912 kB)
Webinar #1: March 21, 2018
Scientific basis for the recommended dose limits for the lens of the eye
The Canadian Nuclear Safety Commission (CNSC) and the Canadian Radiation Protection Association (CRPA) hosted a webinar on March 21, 2018 on the scientific basis for the recommended dose limits for the lens of the eye for nuclear energy workers, as set by the International Commission on Radiological Protection (ICRP). The webinar presented expert opinions and perspectives behind the science.
Chris Clement, Scientific Secretary, International Commission on Radiological Protection
ICRP Recommendations on the Lens of the Eye (PDF 1259 kB)
Liz Ainsbury, PhD, Cytogenetics Group Leader, Public Health England Centre for Radiation, Chemical and Environmental Hazards
Cataract following low dose ionising radiation exposures: Mechanistic understanding and current research (PDF 479 kB)
Roy Shore, PhD, New York University School of Medicine (Professor Emeritus), and Chief of Research, Radiation Effects Research Foundation, Hiroshima, Japan (retired)
Epidemiologic Studies of Radiation Cataract Risk (PDF 500 kB)
Norman J. Kleiman, PhD, Columbia University, Mailman School of Public Health, Dept. Environmental Health Sciences, Director of Eye Radiation and Environmental Research Laboratory, Director of MS Degree Program in Radiological Sciences
Radiation Cataract (PDF 5016 kB)
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