evidence from experiments that used rat tracheal epithelium. Measurements of activity-weighted particle-size distributions relevant to the conditions experienced by historical cohorts of miners are unlikely to become available, because those conditions no longer occur. However, the committee recommends that a Phase II Research Council committee

  • Use noninvasive methods for monitoring ventilation to obtain additional information that is relevant to radon dosimetry and an improved model.

  • Continue to evaluate information on the cells at risk for radon-induced lung cancer.

  • Use activity-weighted size-distribution data that have become available on residences.

  • Use the recent data regarding growth of particles from various sources typically found in the home.

  • Apply the reduced uncertainties in various aspects of lung dosimetry and use revised factors to reassess the uncertainties associated with the lung dosimetry in risk calculations.             

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