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Page Title: Figure 5. Relative radiation resistance of thermosetting resins
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DOE-HDBK-1132-99
As the saturation level in the body of the bulk material is reached, the dissolved
tritium begins to emerge from the unexposed side of the material surface,
where it then begins to move through the mono-molecular layers of water vapor
on that side. In the initial stages, the pattern of the tritium moving into these
mono-molecular layers tends to resemble the reverse of that described in the
surface contamination model described above (i.e., the tritium is incorporated
first into the very tightly bound, near-surface layers, then into the intermediate
layers, and finally into the loosely bound, outer layers). As the tritium saturation
levels in the body of the bulk material gradually reach steady-state, the tritium
levels moving into the mono-molecular layers gradually build over time, and the
Damage
Utility of Plastic
Incipient to mild
Nearly always usable
Mild to moderate
Often satisfactory
Moderate to severe
Limited use
Phenolic, glass laminate
Phenolic, asbestos filled
Phenolic, unfilled
Epoxy, aromatic-type curing agent
Polyurethane
Polyester, glass filled
Polyester, mineral filled
Diallyl Phthalate, mineral filled
Polyester, unfilled
Mylar
Silicone, glass filled
Silicone, mineral filled
Silicone, unfilled
Furane, resin
Melamine-formaldehyde
Urea-formaldehyde
Aniline-formaldehyde
105
106
107
108
109
1010
Gamma Exposure Dose, Rads (C)
FIGURE 5. Relative radiation resistance of thermosetting resins.
I-108


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