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Neutron Emission Yields cont'd - doe-std-1128-98_ch10168
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DOE Standard Guide of Good Practices for Occupational Radiological Protection In Plutonium Facilities
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Table 6.9. Neutron Yields for Trace Impurities in Plutonium and Uranium - doe-std-1128-98_ch10170


DOE-STD-1128-98
Table 6.8. Nuetron Yields from Alpha-Neutron Reactions for Oxides and Fluorides
Average Alpha  α , n Yield in
α , n Yield in
Alpha
Alpha
Decay
Yield
Energy
Oxides
Fluorides
α /s-g
Isotope
Half-Life
MeV
n/s-g
n/s-g
232Th
1.41 x 1010 y  4.1 x 103
4.00
2.2 x 10-5
232U
71.7 y
8.0 x 1011
5.30
1.49 x 104
2.6 x 106
233U
1.59 x 105 y
3.5 x 108
4.82
4.8
7.0 x 102
U
2.45 x 105 y
2.3 x 108
4.76
3.0
5.8 x 102
234
235U
7.04 x 108 y
7.9 x 104
4.40
7.1 x 10-4
0.08
236U
2.34 x 107 y
2.3 x 106
4.48
2.4 x 10-2
2.9
238U
4.47 x 109 y
1.2 x 104
4.19
8.3 x 10-5
0.028
237Np
2.14 x 106 y
2.6 x 107
4.77
3.4 x 10-1
238Pu
87.74 y
6.4 x 1011
5.49
1.34 x 104
2.2 x 106
239Pu
2.41 x 104 y
2.3 x 109
5.1
3.81 x 101
5.6 x 103
240Pu
6.56 x 103 y
8.4 x 109
5.15
1.41 x 102
2.1 x 104
241Pu
5.90 x 105 y
9.4 x 107
4.89
1.3
1.7 x 102
242Pu
3.76 x 105 y
1.4 x 108
4.90
2.0
2.7 x 102
241Am
433.6 y
1.3 x 1011
5.48
2.69 x 103
242Cm
163 days
1.2 x 1014
6.10
3.76 x 106
244Cm
18.1 y
3.0 x 1012
5.80
7.73 x 104
249Bk
6.6 x 104 y
8.8 x 108
5.40
1.8 x 101
252Cf
2.646 y
1.9 x
1013
6.11
6.0 x 105
Multiplying the specific neutron yield (neutrons/second-gram of
plutonium) by the mass of plutonium (grams) gives S, the neutron
emission rate (neutrons/second). The dose equivalent rate is then
calculated using Equation 6.4.
6.2.3.3 Quality Factors for Neutrons
Approved Quality factors for neutrons are provided in 10 CFR 835.2. As
used here Quality Factor means the principal modifying factor used to
calculate the dose equivalent from the absorbed dose; the absorbed dose
(expressed in rad or gray) is multiplied by the appropriate quality factor
(Q).
6-17


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