Webinars on lens of the eye
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Webinar #3: June 6, 2019
Thursday, June 6, 2019 – Webinar on dosimeters for the lens of the eye.
The Canadian Radiological Protection Association (CRPA) will host a webinar on Thursday, June 6, 2019, welcoming dosimetry experts who will present options for dosimeters for the lens of the eye. This is the third and last in a series of webinars on this subject.
Webinar participation detailsJoin the webinar
Dr. Edward Waller
Professor, Faculty of Energy Systems and Nuclear Science
University of Ontario Institute of Technology (UOIT)
Alain Savary holds a master's degree in radiation protection. Since 2001, he has been employed with L'Institut de Radioprotection et de Sûreté Nucléaire (IRSN), where he began his career in the field of operational radiation protection, notably by undertaking numerous projects with holders of ionizing radiation sources. This field experience allowed him to enter the world of dosimetry in 2015. Since then, he has been working as a technical manager in the IRSN’s passive dosimetry laboratory.
The IRSN eye dosimeter, also called DOSIRIS, was created in 2014 to be self-supported and to allow measurements to be taken close to the eye without worker discomfort. Since this dosimeter was introduced, it has been used on many workers. Its metrological performance was tested by the European Radiation Dosimetry Group (EURADOS) in 2016.
Chris Passmore is a Certified Health Physicist and Vice President of Fluke Health Solutions Global Services. He has 29 years of dosimetry and radiation measurement experience. Mr. Passmore serves as a member of the IEC-TC45, ISO-TC85, and the National Council on Radiation Protection and Measurements. Before his employment at Fluke, he worked at Landauer, a U.S.-based company specializing in radiation safety technology and compliance solutions – prior to which he spent 10 years in the U.S. Department of Energy managing dosimetry programs at Rocky Flats and Pantex. Chris holds a Master of Science in health physics from National Technological University and a Bachelor of Science in nuclear engineering from Arizona State University. He also has a Bachelor of Science in physics and a Bachelor of Engineering, both from Illinois College.
Mirela Kirr has 13 years of experience in dosimetry and radiation measurement. She is Director of Dosimetry Services at Landauer, a U.S.-based company specializing in radiation safety technology and compliance solutions. Ms. Kirr is responsible for Landauer’s dosimetry services area, with a focus on dosimetry analysis and records, dosimetry investigations and ionizing instrumentation calibration.
Abstract (pressented by Chris Passmore and Mirela Kirr)
With more scientific evidence regarding the effects of radiation on the eye, the new International Commission on Radiological Protection (ICRP) recommendations on reducing dose to the lens of the eye have triggered the need for a more accurate, easier-to-use dosimeter for measuring this type of dose. A novel dosimeter has been designed to monitor dose to the lens of the eye: It can be worn in multiple ways, with or without protective equipment, and it does not obstruct the field of view. Known for its ergonomic design and ease of use, it has become widely accepted in the medical and industrial fields. In this presentation, the following characteristics of this dosimeter will be discussed: energy response, angular dependence, fade, accuracy, precision, lower limit of detection, and linearity.
Nicky Gibbens is the manager of the Personal Dosimetry Service Centre for Radiation, Chemical and Environmental Hazards at Public Health England.
Public Health England’s dosimeter for the lens of the eye will be presented.
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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