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Termination and Ending - Task Bioassay Participation
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Confirmatory Bioassay Program


DOE-STD-1121-98
Example 5.4. Criteria for Commencing Special Bioassay
Special bioassay should be initiated if any of the following criteria are met (Fauth et al. 1996,
Carbaugh et al. 1994a):
Nasal or mouth smears, nose blows, or sputum samples that indicate above background levels
Any contaminated wound
Contamination on protective clothing in excess of 10,000 dpm-alpha or 100,000 dpm-
beta/gamma per 100 cm2 if no respiratory protection is in use
Unplanned spread of contamination on accessible surfaces in excess of 1500 dpm-alpha or
15,000 dpm-beta/gamma per 100 cm2 if no respiratory protection is in use
Any detectable general facial contamination in excess of 200 dpm-alpha or 4,000 dpm-
beta/gamma per 100 cm2
Detectable contamination on the skin, other than the facial area, in excess of 1000 dpm-alpha
or 100,000 dpm-beta/gamma per 100 cm2
Detectable contamination inside a respirator after its removal
Acute exposure to 40 DAC-h after incorporating any respiratory protection factor
Any unplanned suspected intake
that no further potential for intake existed, then an employment termination bioassay is probably not
needed. For practical purposes, the ending-task measurement may be considered the release of a worker
from requirements for further bioassay.
5.6 BIOASSAY FOR DECLARED PREGNANT FEMALE WORKER
DOE has published an implementation guide on Evaluation and Control of Radiation Dose to the
Embryo/Fetus Guide (DOE 1999a). All relevant parts of this document should be used in design and
operation of the parts of a bioassay program that apply to declared pregnant female workers. This
Technical Standard does not summarize the recommendations of that implementation guide but does note
a few points about internal dosimetry. The dose limits for a declared pregnant worker's embryo-fetus is
substantially more restrictive than those for radiological workers, except for the fact that the 500-mrem
limit applies to the dose equivalent for the nine-month gestation period, and not the committed dose
equivalent for 50 years following intake. The maternal uptakes that would cause a 500-mrem gestation
period dose to the embryo-fetus are in the nominal microcurie range (e.g., approximately 1 :Ci for 238Pu,
10 :Ci for 137Cs, and 50 :Ci for 90Sr, based on Fauth et al. 1996). Routine bioassay programs designed
to monitor workers should be easily adequate to demonstrate compliance with the embryo-fetus dose
limits. As a verification, it may be desirable to obtain a special bioassay upon receipt of a pregnancy
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