Technical Provisions for Internal Dosimetry cont'd

DOE-STD-1098-99

Radiological Control

Radiological Health Support Operations

March 2005

Routine bioassay monitoring methods and frequencies should be established for individuals who are likely to

receive intakes resulting in a committed effective dose equivalent greater than 100 millirem in a year. The technical

basis for the methods and frequency of bioassay monitoring should be documented.

Management should require termination bioassay monitoring when an individual who participated in the bioassay

program terminates employment or concludes work involving the potential for internal exposure. The number of

persons failing to achieve this monitoring should be reviewed periodically and should be used to determine whether

further efforts to get cooperation are warranted.

Bioassay analyses should also be performed when any of the following occurs:

Facial or nasal contamination is detected that indicates a potential for internal contamination exceeding any

monitoring threshold established in Article 521

Airborne monitoring indicates the potential for intakes exceeding 100 millirem committed effective dose

equivalent

Upon direction of the radiological control organization when an intake is suspected.

Levels of intakes that warrant the consideration of medical intervention should be established for site-specific

radionuclides. The effectiveness of medical intervention, such as blocking or chelating agents, should be

documented using bioassay results.

A preliminary assessment of any intakes detected should be conducted prior to permitting an employee to return to

radiological work.

Internal dosimetry program personnel should use radionuclide standards from or traceable to the National Institute

of Standards and Technology (NIST).

10. Internal dosimetry program personnel should participate in the conduct of inter-comparison studies and should use

the "DOE Phantom Library."

11. Bioassay programs implemented at the discretion of the contractor (i.e., for personnel monitoring that is not

required by Article 521.1) need not be accredited under the DOELAP Program. Programs implemented outside the

scope of the DOELAP Program should include:

Documented assessment of each individual's potential occupational exposure to support the decision to

operate outside the DOELAP Program.

Comprehensive monitoring of the areas that may be entered by these individuals to ensure that individual

doses are not likely to exceed the Article 521.1 monitoring thresholds.

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