The Canadian Nuclear Safety Commission (CNSC) continuously conducts and reviews health studies on a variety of areas associated with the production, possession or use of nuclear substances. The information gathered in these studies serves to guide the CNSC in decisions affecting its regulatory framework.
Part of the CNSC's mandate is to provide objective scientific, technical and regulatory information to the public on nuclear-related health and safety topics. The following are highlights of that work.
- Port Hope
- Uranium miners
- Other miners
- Canadian nuclear facilities
- General population studies
Hot topics and relevant third party research
CNSC staff constantly review literature from peer-reviewed journals as well as pertinent non-peer-reviewed literature to ensure that the most up-to-date information is used to support our regulatory framework. Comments and interpretations are provided here for selected topics.
- Fact sheet: Health Effects of the Chernobyl Accident
- The 1986 accident at the Chernobyl nuclear plant in Ukraine was the largest uncontrolled radioactive release in history. The health consequences of radiation exposure from the accident have often been misunderstood. To clarify, the CNSC has published a fact sheet based on the 2011 United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR) report entitled Health effects due to radiation from the Chernobyl accident which summarizes findings based on more than 20 years of follow-up.
Several international studies, published between 1997 and 2014, discuss potassium iodide (KI) pills. Some of the most notable examples include The Hypothalamic-Pituitary-Thyroid Axis in Infants and Children: Protection from Radioiodines; Distributing KI pills to minimize thyroid radiation exposure in case of a nuclear accident in France; Potassium Iodide for thyroid blockade in a reactor accident: administrative policies that govern its use; and Managing terrorism or accidental nuclear errors, preparing for iodine-131 emergencies: a comprehensive review.
These studies explore and describe the benefits of distributing KI pills in advance to citizens living within a 300-mile (483 kilometres) radius of a nuclear power plant, and the need for timely and correct consumption of these pills in the case of a nuclear accident. The studies indicate such preventative measures can greatly reduce the accumulation of radioiodines in the thyroid gland, as well as the resulting radiation dose. This is an essential measure, since thyroid cancer –, most specifically in children and infants – is one of the most frequently observed consequences of a nuclear accident. The studies also highlight the need for appropriate administrative policies and increased research on the topic of children and infant consumption of KI pills, to better understand both the effectiveness and the safety of these measures.
- New report on the uranium industry: Managing Environmental and Health Impacts of Uranium Mining (PDF). Read the extended executive summary: Perceptions and Realities in Modern Uranium Mining – Extended Summary (PDF) (source: Nuclear Energy Agency (NEA), a specialized agency within the Organisation for Economic Co-operation and Development)
- This recent international report issued by the NEA provides a factual account of how modern uranium mining is the most regulated and one of the safest and environmentally responsible forms of mining in the world. The report confirms that current mining practices and regulations protect the health and safety of the public, workers and the environment. The report uses case studies, which highlight the leading regulatory framework and practices applied in Canada, by the CNSC, provincial authorities and the uranium industry, throughout the lifecycle of a uranium mine.
- New study on childhood leukemia: Leukemia in young children in the vicinity of British nuclear power plants: a case-control study (source: British Journal of Cancer)
A recent British case-control study has found that young children who were born or live near a nuclear power plant sometime between 1962 and 2007 do not have a greater risk of developing childhood leukemia or non-Hodgkin lymphoma. The study was led by researchers from the Childhood Cancer Research Group in Oxford, England and published in the September 2013 edition of the British Journal of Cancer. The results draw the same conclusions as those recently published in the CNSC cancer study.
- New tritium study: Estimating cancer risk in relation to tritium exposure from routine operation of a nuclear-generating station in Pickering, Ontario (source: Chronic Diseases and Injuries in Canada Journal)
A recent study, led by Cancer Care Ontario and published in the September 2013 edition of the scientific journal Chronic Diseases and Injuries in Canada, has confirmed that tritium is not associated with an increased risk of radiation-sensitive cancers in Pickering, Ontario. This study is important because it isolates tritium-specific dose data. More often, tritium data is combined with all other radiation exposures. This study increases our understanding of cancer risks and low level tritium exposure.
- Fukushima health reports
- Fact sheet: The KiKK Study Explained
- Depleted uranium and Canadian veterans: A review of potential exposure and health effects
- Northern Saskatchewan Health Indicators Report 2011
To assist readers in their understanding of our technical reports, the CNSC has put together a group of useful resources. These lay the foundation for understanding the different kinds of studies and highlight important factors to consider when reviewing a study. They provide details on the basics of topics like radiation, epidemiology and explain related terminology.
- Basic epidemiology concepts
- Introduction to radiation
- Setting radiation protection requirements on the basis of sound science: The role of epidemiology (INFO-0812)
- Introduction to dosimetry (INFO-0827)
- Nuclear and radiation glossary
- Fact sheet: Linear-non-threshold
Health studies – topics
CNSC staff conduct health studies on various topics, including tritium, uranium mining and milling, other mining activities, nuclear energy workers and members of the general population. These studies are conducted in order to enable the effective management of radiation risks and to set regulatory limits that will protect workers and the public from ionizing radiation.
- Tritium overview
- Measurements and dose consequences of tritium in municipal sewage sludge
- Environmental fate of tritium in soil and vegetation
- Tritium releases and dose consequences in Canada in 2006 (INFO-0793)
- Tritium activity in garden produce from Pembroke in 2007 and dose to the public (INFO-0798)
- Health effects, dosimetry and radiological protection of tritium (INFO-0799)
- Tritium Studies Project Synthesis Report (INFO-0800)
- Review of the knowledge available to date on the effects of tritium exposure on health and the environment in Canada – a tool to guide regulatory compliance monitoring (Journal article, French only)
- Understanding health studies and risk assessments conducted in the Port Hope community from the 1950s to the present (INFO-0781)
- An ecological study of cancer incidence in Port Hope, Ontario from 1992 to 2007 (Journal article)
- Use of a weight of evidence approach to determine the likelihood of adverse effects on human health from the presence of uranium facilities in Port Hope, Ontario (Journal article)
- Mortality (1950–1999) and cancer incidence (1969–1999) Of workers in the Port Hope cohort study exposed to a unique combination of radium, uranium and gamma-ray doses (Journal article)
- Updated Analysis of the Eldorado Uranium Miners' Cohort: Part I of the Saskatchewan Uranium Miners' Cohort Study (RSP-0205) (RSP-0205 Summary)
- Feasibility Study: Saskatchewan Uranium Miners Cohort Study (Part II) (RSP-0178) (RSP-0178 Summary)
- Mortality (1950–1999) and cancer incidence (1969–1999) in the cohort of Eldorado uranium workers (Journal article)
- Lung cancer mortality (1950–1999) among Eldorado uranium workers: A comparison of the TSCE and ERR models (Journal article)
- Fact sheet: Polonium-210
- Fact sheet: Radon
- Radon and health (INFO-0813) (PDF)
- Radon progeny exposure and lung cancer: A Mortality study of Newfoundland Fluorspar miners 1950–2001 ( RSP-0193 Summary)
Canadian nuclear facilities
- Study of Consequences of a Hypothetical Severe Nuclear Accident and Effectiveness of Mitigation Measures
- Occupational dose data for major Canadian nuclear facilities 2001–07 (INFO-0775)
- Verifying Canadian nuclear energy worker radiation risk: A reanalysis of cancer mortality in Canadian nuclear energy workers (1957–1994) (INFO-0811)
General population studies
- Radiation and incidence of cancer around Ontario nuclear power plants from 1990 to 2008 (the RADICON study)
- Evidence of children's vulnerability to radiation in the context of radiological/nuclear events and considerations for emergency response (Journal article)
- Northern Saskatchewan Health Indicators Report 2011
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