Quantcast Figure 2.3 Neutron Energy Spectra of Plutonium-Beryllium and Plutonium-Boron Neutron Sources Compared with a Fission Source

 

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Page Title: Figure 2.3 Neutron Energy Spectra of Plutonium-Beryllium and Plutonium-Boron Neutron Sources Compared with a Fission Source
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Physical and Chemical Properties - doe-std-1128-98_ch10023
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DOE Standard Guide of Good Practices for Occupational Radiological Protection In Plutonium Facilities
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Table 2.5. Allotropic Forms of Plutonium Metal(a) - doe-std-1128-98_ch10025


DOE-STD-1128-98
Figure 2.3 Neutron Energy Spectra of Plutonium-Beryllium and Plutonium-Boron Neutron
Sources Compared with a Fission Source
plutonium exists in the α 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
α  β 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 σ -
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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