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Page Title: Table 4-7. ARFs From Heating Sm all Pieces Delta-Phase Plutonium M etal Under Specific Conditions
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DOE-HDBK-3010-94
4.0 Solids; Metals
aerosol formation under the experimental conditions. The size distribution measured for the
airborne particles under various conditions of atmosphere and temperature are shown in
Figures A.19 and A.20 taken from the reference document. In all cases, the RFs range from
0.05 to 0.5.
Eidson, Yeh, and Kanapilly (1988) reported the airborne release and size distribution from
heating 1-gram or 10-gram pellets or foil to 450 oC in a reducing atmosphere followed in
some cases by heating the powder produced in air. Gas velocities over the reacting materials
ranged from 0.4- to 10-m/s in the 24-mm i.d. quartz reaction tube. The airborne materials
were collected on a glass fiber filter or sized in a 7-stage cascade impactor. Point-to-plane
electrostatic precipitator samples were taken for transmission electron microscopy to
characterize the airborne materials. The pertinent data are shown in Table 4-7 with the data
from the source document reproduced in Table A.27 in Appendix A.
Table 4-7. ARFs From Heating Sm all Pieces Delta-Phase
Plutonium M etal Under Specific Conditions
(Table 1 - Eidson, Yeh and Kanapilly 1988)
Linear Flow Velocity
Pu M ass
Specim en
ARF1
Atm osphere
cm /s
gram s
Shape
3% H2 + Ar then air
500
0.94
pellet
1.1E-4
1000
1.05
pellet
1.1E-3
1000
0.92
pellet
7.4E-4
500
1.08
pellet
3.7E-3
3% H2 + Ar
1000
1.12
pellet
4.6E-3
500
1.05
pellet
3.0E-4
3% H2 + 5% N2 + Ar
1000
1.13
pellet
6.6E-5
1000
1.05
pellet
4.5E-4
40
1.39
foil
9.2E-5
40
9.63
pellet
1.2E-5
40
10.22
foil
8.5E-6
40
1.40
foil
2.8E-4
3% H2 + Ar
40
9.62
pellet
1.8E-5
40
9.64
foil
4.2E-4
1
All in the respirable fraction defined in this study as particles 5 m AED and less.
The bounding ARF and RF are 5E-3 and 1.0 with median values of 2E-4 and 1.0. There
does appear to be a detectible effect by the atmosphere present or surface to mass ratio. The
MMD of the residual powders ranged from 4 to 350 m Stokes diameter (equivalent sphere).
The Activity Median Aerodynamic Diameter (AMAD, in which half the activity in the
sample is associated with particles less than and half the activity is associated with particles
Page 4-29


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