Quantcast Table 6.11. Photon Dose Rates at 2 Meters from Cylinders of Plutonium Containing 1 kg of Plutonium at 5 Years After Chemical Separation - doe-std-1128-98_ch10188

 

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Neutron Shielding - doe-std-1128-98_ch10187
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DOE Standard Guide of Good Practices for Occupational Radiological Protection In Plutonium Facilities
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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


DOE-STD-1128-98
Figure 6.7 shows the reduction in dose equivalent rate for various
shielding materials for plutonium tetrafluoride sources, which have an
average neutron energy of 1.3 MeV. For practical purposes, the shielding
thickness for glove boxes is limited to about 4 in.; it is not possible to
operate machinery through thicker shields. Figure 6.8 shows the
reduction in dose equivalent rate through various slab shields for
plutonium dioxide. These data were obtained from measurements of the
neutron dose using a TEPC.
Table 6.11.1
Photon Dose Rates at 2 Meters from Cylinders of Plutonium Containing 1 kg
of Plutonium at 5 Years After Chemical Separation
Photon Dose Rate, mrad/h
Shield
Shield
Thickness
19% 240Pu Source
6% 240Pu Source
Material
cm
Polyvinyl chloride
0.005
19.3
1.74
(PVC)
0.038
8.72
0.570
0.084
6.29
0.391
Lead Glove
0.094
1.85
0.105
Heavy Lead Glove
0.152
0.54
0.0464
Lucite
0.612
7.03
0.447
2.54
3.30
0.190
Steel
0.025
2.69
0.144
0.038
2.41
0.131
0.051
2.19
0.121
0.317
0.42
0.0418
0.635
0.221
0.0299
1.33
0.134
0.0205
2.43
0.0766
0.0119
Lead
0.635
0.0701
0.0103
1.27
0.0380
0.00288
2.57
0.0156
0.000391
5.08
0.00429
0.00023
10.16
0.000467
0.0000001
X-ray Glass
0.645
0.135
0.0251
1.30
0.0841
0.0144
2.60
0.0463
0.00534
Lead Apron
0.16
0.306
0.0346
Safety Glass
1.30
1.94
0.109
2.60
1.50
0.0886
Adapted from NUREG/CR-5550 (Reilly et al., 1991)
1
6-36


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