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Page Title:
Potential exposure pathways of tritium |
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|  Radiological Assessor Training
DOE-HDBK-1141-2001
Instructor's Guide
Show OT 7.6.
C. Potential exposure pathways of tritium
Dose pathways and biological effects
Inhalation
Elemental tritium (tritium gas) - Limiting
condition is exposure to the lung
Approximately 0.005% of HT inhaled is
converted to HTO prior to exhalation
Nearly 100% of inhaled HTO is
incorporated into body fluids/tissues.
Ingestion
Tritiated water
Assumed to be instantaneous
Biological half-life is normally ten
days, but may be reduced by a
factor or two-three with increased
fluid intake
Skin absorption of HTO through intact skin
≈50% of that inhaled.
For different modes of entry of STCs:
STPs behave with the characteristics
of the particle to which they are
attached.
-
Soluble OBT distributes throughout the
body causing a whole body dose.
Insoluble OBT can be taken into the
body by inhalation when in particulate
form. Airborne droplets of insoluble
components of oils may be treated as
stable particulates.
Module 7 6
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