Document: 10 CFR Part 20
Document ID: f899860c-1afc-494c-8665-8b5ccf40104f
Document Type: cfr
Title: Use of individual respiratory protection equipment.
Source: 10 CFR Part 20
Source URL: https://www.ecfr.gov/current/title-10/part-20/section-20.1703
Revision Date: 
Chapter: 
Section ID: 20.1703
CFR Part: 20
CFR Title: 10

Content:
rom intake of airborne radioactive materials, the concentration of radioactive material in the air that is inhaled when respirators are worn is initially assumed to be the ambient concentration in air without respiratory protection, divided by the assigned protection factor. If the dose is later found to be greater than the estimated dose, the corrected value must be used. If the dose is later found to be less than the estimated dose, the corrected value may be used. [ 64 FR 54557 , Oct. 7, 1999, as amended at 67 FR 77652 , Dec. 19, 2002]