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Radiological Assessor Training
DOE-HDBK-1141-2001
Student's Guide
I. Measurement techniques for tritium
1. Air monitoring - Fixed and portable ionization
chambers most widely used.
2. Differential monitoring - Separate monitoring
of HT and HTO components through the use
of bubblers in conjunction with desiccants or
catalysts.
3. Discrete sampling - Samples collected with a
bubbler or "cold finger" type sampler, then
later analyzed by liquid scintillation counting
techniques.
4. Process monitoring
Stack, room, hood, glove box
Mass spectroscopy, gas chromatography,
calorimetry
5. Surface monitoring
Difficult to measure directly due to low-
energy emission
May have some success with thin window
GM (pancake style probe), thin window
sodium iodine, or gas flow proportional
counters
Smears taken for loose contamination,
and measured by dissolution and analysis
by liquid scintillation counting techniques
6. Liquid Monitoring - Liquid scintillation
counting techniques
Module 7 - 10


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