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|  DOE-HDBK-1106-97
Radiological Contamination Control Training
for Laboratory Research
Instructor's Guide
Instructor's Notes
5.
Physical half-life (T1/2): 12.35 years.
6.
Effective half-life (Teff): 10 days (the time it takes
for of the material to be eliminated from the body
by both biological processes and radioactive decay).
Critical organ: Whole body (the part of the body
7.
where the most limiting dose is delivered).
Personnel monitoring: Bioassay - urinanalysis, NOT
8.
detected with a dosimeter (thermoluminescent
dosimeter (TLD) or film).
Elemental tritium is not taken
Annual Limit of Intake (ALI): Tritiated water:
9.
80 mCi (3 x 109 Bq) by inhalation or ingestion.
into the body and is assigned an
ALI based on a TEDE resulting
from lung exposure. However,
in many environments elemental
tritium converts rapidly to
tritiated water vapor.
Shielding: None (the low-energy beta is not very
10.
penetrating).
11.
Special Considerations:
o
Cannot be measured directly with a thin-
window G-M probe (standard survey meter).
A-2
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