Quantcast Exposure in DAC-h

 

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Calculation of Internal Dose from Workplace Data
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Internal Dosimetry - index
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Assigned Respiratory Protection Factors for Use in Dose Evaluations


DOE-STD-1121-98
Stochastic ALIs, SALI, for inhalation, can be computed from DACs in 10 CFR 835 Appendix A provided
the notation "St" appears in the right-hand column of Appendix A of 10 CFR 835 for the DAC in
question.
If not, SALI values can be found in Federal Guidance Report 11 (Eckerman et al. 1988) or the ICRP
Publication 30 series. These SALI values are valid for 1 :m activity median aerodynamic diameter
(AMAD) aerosols. ICRP 30 gives a methodology for adjusting the SALIs for other particle sizes (ICRP
1979a). If the more recent respiratory tract model and dosimetric methods are used (ICRP 1994a),
consideration should be given to adjustments for activity median thermodynamic diameter (AMTD) for
aerosol size distributions below 0.1 :m, in the size region where the diffusive behavior of particles
predominates.
7.5.2 Exposure in DAC-h
Often, before an intake is computed, an exposure in terms of DAC-h is evaluated. The exposure, E,
is
(22)
For an aerosol whose activity median aerodynamic diameter (AMAD) is 1 :m, the committed effective
dose equivalent HE,50 is
(23)
The committed dose equivalent to limiting tissue T (as listed in the right-hand column of Appendix A of
10 CFR 835) is
(24)
If the only DAC available is a nonstochastic DAC, then HE,50 cannot be assessed using that DAC and air
monitoring data. All that can be stated with certainty regarding the committed effective dose equivalent
from an intake of 1 NALI (2000 DACn-h) is
(25)
For thyroid and bone surfaces, wT = 0.03, an intake of 1 NALI (2000 DACn-h) leads to HE,50 of
(26)
79


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