Quantcast Table 6.5. Gamma Dose Rates Along an Arm Phantom in Contact with a Steel Can Containing 1 kg of Plutonium Dioxide in an Uncontaminated Glove Box - doe-std-1128-98_ch10161

 

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Table 6-4. Isotopic Composition of the Plutonium Used in the Extremity Dosimetry Measurments
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DOE Standard Guide of Good Practices for Occupational Radiological Protection In Plutonium Facilities
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Table 6.6. Gamma Dose Rates Measured with an Arm Phantom Placed Inside Gloves Dusted with Plutonium Dioxide Powder - doe-std-1128-98_ch10162


DOE-STD-1128-98
Table 6.5. Gamma Dose Rates Along an Arm Phantom in Contact with a Steel Can Containing
1 kg of Plutonium Dioxide in an Uncontaminated Glove Box
Gamma Dose Rates, mrad/h
Neoprene Glove
Lead-Loaded Glove
Position
330 + 6
Ring Finger
272 + 25
Palm
292 + 9
220 + 16
Back of Hand
72 + 2
65 + 1
Wrist
Inside
84 + 6
56 + 5
Outside
31 + 1
24 + 1
Forearm
Inside
22 + 0.4
12 + 1
Outside
4.4 + 0.1
3.8 + 0.4
Elbow
Inside
4.8 + 0.1
2.6 + 0.2
Outside
1.4 + 0.1
1.8 + 0.4
Front
2.9 + 0.2
2.1 + 0.1
Bottom of humerus
2.2 + 0.1
2.5 + 0.5
Lower mid-arm
7.1 + 0.1
3.9 + 0.3
Lower mid-humerus
3.8 + 0.1
2.3 + 0.2
Upper mid-arm
2.4 + 0.1
2.5 + 0.2
Upper mid-humerus
1.8 + 0.1
1.8 + 0.2
Top of arm
0.9 + 0.03
2.2 + 0.8
Top of humerus
1.1 + 0.2
1.3 + 0.1
The gamma energy spectra from plutonium sources are highly variable,
depending on the amount of shielding present, including self-shielding.
Small lightly shielded sources, such as dust layers on the interior of
glove boxes, are dominated by L X-rays and the 60-keV photons from
241Am, the decay progeny of 241Pu.
But the gamma energy spectra are quite different in storage vaults and
other facilities where the plutonium is encapsulated. In those cases, the
low-energy photons have been shielded out, and the spectrum is
dominated by higher photon energies. Note that plutonium metal buttons
or cans of plutonium oxide prepared for storage are self-shielded, and
high-energy photons from decay progeny such as 237U become
increasingly important.
6-9


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