Total effective dose equivalent

NRC. 1992. Residual radioactive contamination form decommissioning Technical basis for translating contamination levels to annual total effective dose equivalent. Washington, DC Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission. NUREG/CR-5512. 

KENNEDY, W.E., JR. and STRENGE, D.L. (1992). Residual Radioactive Contamination from Decommissioning Technical Basis for Translating Contamination Levels to Annual Total Effective Dose Equivalent, U.S. Nuclear Regulatory Commission Report NUREG/CR-5512, Volume 1 (National Technical Information Service, Springfield, Virginia). 

Radon and thoron and their decay products are the most important sources of radiation exposure to the general public, contributing on average about half of the total effective dose equivalent received from natural and man-made radioactivity (Clarke Southwood, 1989). 

Adult Total effective dose equivalent for entire body 5... 

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). 

Limits for members of the public entering a controlled area (total effective dose equivalent in a year) 0.01 rem (0.001 Sv) DOE 2001b 10CFR835.208... 

DOE Occupational dose limits for general employees Total effective dose equivalent 5 rems (0.05 Sv) DOE 2001d 10CFR835.202... 

Standards for protection against radiation—dose limits for individual members of the public Total effective dose equivalent to individual 0.1 rem/year NRC 2001q 10CFR20.1301... 

It is not necessary in every case to sum the external and internal doses if the licensee can show that the internal dose does not contribute significantly. If, for example, the only intake of radioactivity is by inhalation, the total effective dose equivalent is not exceeded if the deep-dose equivalent divided by the total effective dose equivalent, plus an estimate of the internal dose as determined by one of three procedures stipulated in the regulation does not exceed 1, the internal dose need not be added to the external dose. Similarly, unless the amount of radioactivity ingested is more than 10% of the applicable ALI, it need not be included in the total dose equivalent. Most laboratories using radioactive materials at reasonable levels under normal conditions will find that they need only consider external exposures, just as they once did. 

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. 

NRC Occupational dose limits for adults Total effective dose equivalent limits 5 rems/year NRC ... 

A committed effective dose equivalent or total effective dose equivalent to any member of the public no greater than 4 mrem may result annually from exposure to and consumption of groundwater contaminated by releases from an LLRW disposal facility. 

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

The total effective dose equivalent to any individual member of the public cannot exceed 0.1 rem in a year, exclusive of the contribution from the license s disposal of waste. The dose in any unrestricted area shall not exceed 2 mrem in any... 

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. 

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