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Page Title: Figure 2.3 Neutron Energy Spectra of Plutonium-Beryllium and Plutonium-Boron Neutron Sources Compared
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DOE-STD-1128-98
Guide of Good Practices for Occupational Radiological Protection in Plutonium Facilities
Figure 2.3
Neutron Energy Spectra of Plutonium-Beryllium and Plutonium-Boron Neutron Sources
Compared with a Fission Source
plutonium exists in the " phase, which has a triclinic structure with a theoretical density
of about 19.86 g/cm3. The dimensional stability of this phase is aggravated by its high
linear thermal expansion coefficient and its low " 6 $ transition temperature. This
transformation takes place at approximately 115C, resulting in a 10% volume change.
The combination of a high specific activity and low thermal conductivity can result in
significant dimensional distortion during metal-forming operations. For this reason, a *-
stabilized dilute gallium alloy, which has a density of about 15.75 g/cm3, is used when a
more dimensionally stable plutonium is desired (Merz, 1971).
2-10


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