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Example 5.2. Criteria for Participating in Individual Monitoring Programs
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Internal Dosimetry - index
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Example 5.3. Circumstances Not Requiring Routine Individual Monitoring


DOE-STD-1121-98
Example 5.2 (Continued)
pressure suits should undergo routine bioassay or have provisions for breathing zone air sampling
within the suit.
Criterion 5:
Long-term chronic exposure to air concentrations exceeding 2% of the DAC
This condition can apply to facilities that have low-level airborne radioactivity but do not meet the
criteria for posting as airborne contamination areas. Caution: just because an area does not require
posting as an airborne contamination area (that is, 10% of the DAC) does not mean that individual
monitoring is not needed. Where routine air concentrations never exceed posting requirements but
exceed 2% of the DAC, the need for individual monitoring should be based on potential stay times in
those areas. Continuous (or significant) occupancy over a year would suggest individual monitoring
is needed.
Criterion 6:
Short-term chronic airborne exposure, or multiple acute airborne exposures
Criteria 6 and 7 may be particularly useful for addressing supervisory, walk-through, and inspection
staff who do not actually handle or process radioactive material. The derived concentration threshold
for individual monitoring (Cair, in terms of fractional DAC) can be calculated using an exposure
fraction for the worker (fw), as follows:
Criterion 7:
Tracking individual exposure in DAC-h
Individual work assignments and concentrations are tracked to determine cumulative exposure in
DAC-h. Once a worker exceeds 40 DAC-h, bioassay should be performed (if feasible). This method
implies the use of a DAC-h tracking log. Such a log might be continued for a worker over the course
of a year and then zeroed out at the start of a new year. One issue to be resolved by the facility is
what to do with DAC-h if the total never exceeds 40. For this situation, sites should still provide
intake and dose assessments based solely on DAC-h.
52


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