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.
On this page:
- About the National Dose Registry
- Dose history summary request form
- Annual reports on occupational radiation exposures
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)
Radiation Protection Building, AL 6302D
775 Brookfield Road
Information for employers
- Read the Privacy Notice.
- Review the instructions on how to fill in an Employee's Dose History Summary (EDHS) request form.
- Two options are available on how worker dose records are combined into annual doses. Select the proper EDHS request form.
- Employee's Dose History Summary (EDHS)/General request form: Using this form, the year of a dose record is based on the monitoring start date. The 5-year dose limit is calculated on the previous 5 calendar years. With this option, a worker's entire dose history is available. This form can be used for all workers.
- Employee's Dose History Summary (EDHS)/Canadian Nuclear Safety Commission (CNSC) request form: Using this form, the year of a dose record is based on the regulations of the Canadian Nuclear Safety Commission (CNSC). The 5-year dose is calculated using CNSC's fixed 5-year blocks, which start with 2001. With this option, only the worker's dose history from 2001 is available. This form is usually used for nuclear energy workers.
Information for employees
- Read the Privacy Notice.
- Review the instructions on how to fill in an Personal Dose History Summary (PDHS) request form.
- 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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