National Dose Registry

The National Dose Registry (NDR) contains the dose records of individuals who are monitored for exposures to ionizing radiation in their working environment.

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About the National Dose Registry

The National Dose Registry is Canada's national repository for radiation dose records of Canadian workers. It is administered by Health Canada's Radiation Protection Bureau and supports Health Canada and Canadian regulatory authorities in their mandates to protect the health and safety of Canadians exposed to ionizing radiation in the workplace including, but not limited to, nuclear power plants, uranium mines, dental offices, and hospitals.

It has been in continuous operation since 1951 and now contains the records of about one million individuals who have been monitored for ionizing radiation exposure as part of their jobs, including more than 170,000 members of the present-day workforce.

The NDR issues summary reports on occupational exposure in Canada and participates in epidemiological studies to gather information on the assessment and management of risk from occupational exposure. The NDR safeguards personal information in accordance with the Government of Canada's privacy legislation and policies.

Dose history summary request form

Workers who are monitored for exposure to radiation may request their Personal Dose History Summary (PDHS) from the National Dose Registry. Employers and prospective employers can obtain an Employee's Dose History Summary (EDHS) upon written consent of the radiation worker.

Routine DHS requests are usually processed within 10 working days. Please refer to the instructions for more detailed information on how to submit a DHS request to the NDR.

The forms can be sent by mail or fax:

National Dose Registry (NDR)
Health Canada
Radiation Protection Building, AL 6302D
775 Brookfield Road
Ottawa, Ontario
K1A 1C1
Fax: 613-957-0960

Information for employers

  1. Read the Privacy Notice.
  2. Review the instructions on how to fill in an Employee's Dose History Summary (EDHS) request form.
  3. Two options are available on how worker dose records are combined into annual doses. Select the proper EDHS request form.

Information for employees

  1. Read the Privacy Notice.
  2. Review the instructions on how to fill in an Personal Dose History Summary (PDHS) request form.
  3. Personal Dose History Summary (PDHS) request form

Note: Print all forms on 8½ x 11 inch paper and adhere to the spaces provided when entering information. Do not add information to the back of the forms after printing.

Annual reports on occupational radiation exposures

The series of reports, based on data from the NDR, provides information on occupational radiation exposure of monitored workers in Canada. The statistics are intended to assist regulatory authorities, organizations, and private individuals in comparing incurred occupational radiation exposures with national, provincial/territorial, regional or sectoral averages and trends.

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