Total effective dose equivalent TEDE

Current federal and state regulations limit radiation workers doses to a total effective dose equivalent (TEDE) of 5 rem/year and a committed dose equivalent to any organ, other than the lens of the eye, of 50 rem/year (EPA 1988c USNRC 1995a). These limits apply to the sum of external and internal doses. The limits are upper limits, and an important philosophy in radiahon protection is to keep radiation doses as low as reasonably achievable (ALARA). 

The ALI is the activity of a radionuclide that can be taken into the body in a year, by inhalation or ingestion, without exceeding a committed effective dose equivalent (CEDE) of 5 rem/year or a committed dose equivalent to any organ of 50 rem/year, whichever is more limiting. The total effective dose equivalent TEDE is the sum of the CEDE and any penetrating external dose (10 CFR 20). If any external dose is present the ALI must be reduced by a proportional amount to ensure that the dose limits are not exceeded. For example, if a worker received an external dose of 1 rem/year, the ALI would have to be reduced by 20% to ensure that the TEDE did not exceed 5 rem/year. 

Total effective dose equivalent (TEDE) is the sum of the deep-dose equivalent (for external exposure) and the committed effective dose equivalent (for internal exposure). 

The radiation protection personnel in the ES H Center maintain records of all radiation-protection surveys it performs at the HCF. These records include the type of survey performed, who performed the survey, for whom the survey was performed, and why the survey was performed. Current records of personnel dosimetry records are maintained in a centralized SNL database. Radiation workers can receive a record of their exposure at anytime upon request. In addition to this, an annuai summary of total effective dose equivalents (TEDE) is provided to ail radiation workers. These records are also available when the worker s employment Is terminated. 

The Total Effective Dose Equivalent (TEDE) is defined as the sum of the deep-dose equivalent and the Committed Effective Dose Equivalent (CEDE). The deep-dose equivalent is related to ... 

For the sensitivity analyses, total effective dose equivalent (TEDE) was calculated for individual radionuclides at 50 000 yr for a receptor group 20 km down-gradient from the proposed repository. A total of 250 realizations were used to represent the range in TEDE resulting from parameter uncertainty. 

Notes ERPG = Emergency Response Planning Guideline, TEDE = Total Effective Dose Equivalent, MOI = Maximally Exposed Off-site Individual, TEEL = Temporary Emergency Exposure Limit. 

Dose equivalent (rem) is a measure of biological damage that is calculated by multiplying absorbed dose by quality factor for the type of radiation involved. The unit of dose is the rem. The TEDE (total dose equivalent) is a term that combines the effects of both the internal and external exposures. 

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