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| DOE-STD-1128-98
Figure 6.6.
Reduction in Photon Dose Rate with Various Shielding Materials at a Distance of 3
cm from a 100-gram Disk of Plutonium Oxide
Separation of the Plutonium
Weight-Percent of Isotope
Low-exposure Pu
High-exposure Pu
Pu
0.001
1.85
235
239Pu
93.5
63.3
240Pu
5.99
19.2
241Pu
0.397
9.27
242Pu
0.001
3.88
241Am
0.103
2.40
6-37
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