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Internal Dose Measurements - hdbk1113cn10078
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DOE-HDBK-1113-98
Module 104 Internal Dose Control
Lesson Plan
Instructor's Notes
therefore considered to be unacceptable. Improved
analytical and calculational techniques have now made it
possible to measure uranium concentrations resulting in
exposures of about 10 mrem with a reasonable degree of
accuracy. The estimation of low-level internal exposure to
uranium is no longer a matter for inordinate concern.
Indirect or In Vitro Measurement
1.
Bodily processes will, to some degree, eliminate
uranium taken into the body. How effective the
body is at eliminating the uranium, and how long
the process takes, depends upon individual
metabolism and the chemical form of the uranium.
For example, uranium hexafluoride contains
uranium that is chemically bound to fluorine and is
more easily eliminated than uranium metal or
uranium dioxide.
Indirect measurements are made by sampling
material eliminated by the body for the presence of
uranium. It is possible to analyze both feces and
urine for the presence of uranium, but due to the
ease of collection and handling, the most common
method used is urinalysis.
Direct or In Vivo Measurement
2.
Direct measurements are performed using whole
body counters or lung counters. These instruments
42


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