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Radiological Assessor Training
DOE-HDBK-1141-2001
Instructor's Guide
Analysis - Contamination Levels on Gaskets and Pigtails
Concentration
Sample Number
Nuclide Analyzed
(dpm)
234
Th and 234mPa
11,000,000 Beta*
C-337-A Gaskets (2 gaskets combined for one
sample)
U activity
156,000 Alpha
234
Th and 234mPa
163,000 Beta
C-310 Burp Station Gasket (1 gasket)
U activity
140,000 Alpha
234
Th and 234mPa
40,000 Beta
C-310 Product Withdrawal Gasket (1 gasket)
U activity
1,900 Alpha
234
Th and 234mPa
117,000 Beta
C-315 Tails Withdrawal Gasket (2 gaskets)
U activity
20,600 Alpha
234
Th and 234mPa
1,500,000 Beta
C-360 Sampling and Transfer Facility Gasket
(3 gaskets)
U activity
78,000 Alpha
234
Th and 234mPa
see Note 1 Beta*
SP-8757, Pigtails coupling, feed header end
of pigtail
U activity
see Note 1 Alpha
234
Th and 234mPa
see Note 1 Beta
SP-8758, Pigtail coupling, cylinder end of
pigtail
U activity
see Note 1 Alpha
234
Th and 234mPa
2,300,000 Beta
SP-8759, Material knocked loose from SP-
8757
U activity
27,000 Alpha
234
Th and 234mPa
2,300,000 Beta
SP-8760, Material knocked loose from SP-
8758
U activity
75,000 Alpha
*Each radionuclide contributes 50 percent to this total activity.
Note 1:
Beta/gamma levels were too high to be accurately counted on the spectrometer due to
detector dead time (saturation).
Module 16 13


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