Analysis - Contamination Levels on Gaskets and Pigtails - DOE-HDBK-1141-2001

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).

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