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Concentration of radioactive material in air |
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|  Radiological Assessor Training
DOE-HDBK-1141-2001
Student's Guide
The term "unusual conditions" is made clear
by specifying that alternatives which would
preclude exposures higher than the
prescribed dose limits must be either
unavailable or impractical.
10 CFR 835.204 specifies requirements for
annual and lifetime dose from PSEs. It also
specifies requirements for determining
previous individual exposures prior to
allowing a PSE.
Every PSE must be approved in advance by
DOE and requires the informed consent of
the employee involved.
3. Concentration of radioactive material in air
Appendices A and C contain the derived air
concentration (DAC) values used in the
control of occupational exposure to airborne
radioactive material.
DACs are listed in appendices A and C of 10
CFR 835. For intakes (appendix A), they are
the airborne concentration that equals the
annual limit on intake (ALI) divided by the
volume of air breathed by an average worker
for a working year of 2000 hours (assuming a
breathing volume of 2400 m3).
The ALI is the smaller value of intake of a
given radionuclide in a year by a
standardized man that would result in a
CEDE of 5 rems or a CDE of 50 rems to any
individual organ or tissue.
Module 2 - 6
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