SEM Analysis of Radiation Test Samples at Duke University

1
SEM Analysis of RadiationTest Samples atDuke
University

Jack Fowler
2
Gas Stream Component Samples

• Samples of components and construction materials
  were placed in a sealed box outside the radiation
  area with the exit ionization gas passing through
• The samples were exposed for 960 hrs

3
Gas Stream Component Samples

• The samples were removed and some were stuck
  together.
• Stycast 1266 was sticky
• Did the glue spread / evaporate and stick the
  parts together??

4
Conductive Glue Sample in Outlet Gas Stream

• This is the surface as cured of a sample of
  conductive glue Tra Bond 2902
• Visually the surface appeared brown from an
  unexposed sample.

5
Conductive Glue Sample in Outlet Gas Stream

• Notice the large F peak from the analysis of the
  surface of the epoxy

6
Cross Section of Conductive Glue Sample
7
Cross Section of Conductive Glue Sample

• F was only found near the surface of the section
• F had penetrated 150?m

8
Summary

• Samples of Stycast 1266 were tacky after exposure
• Conductive epoxy Tra Bond 2902 appeared brown
  after exposure
• Many of the small parts were stuck together after
  exposure
• None of the other materials were visibly damaged
  but they were only observed optically and were
  not examined under the SEM
• F deposits were on the surface of the conductive
  epoxy and found 150 ?m below the surface
• The glass from our flow meter was more frosted
  than prior to the start of the run