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Page Title:
Table 6.8. Neutron Yields from Alpha-Neutron Reactions for Oxides and Fluorides |
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| 0181im.jpg) DOE-STD-1128-98
Guide of Good Practices for Occupational Radiological Protection in Plutonium Facilities
", n Yield in
", n Yield in
Alpha
Alpha
Average Alpha
Yield,
Decay
Energy,
Oxides,
Fluorides,
"/s-g
Half-Life
MeV
n/s-g
n/s-g
Isotope
232
1.41 x 1010 y
4.1 x 103
2.2 x 10-5
Th
4.00
8.0 x 1011
1.49 x 104
2.6 x 106
232
U
71.7 y
5.30
1.59 x 105 y
3.5 x 108
7.0 x 102
233
U
4.82
4.8
2.45 x 105 y
2.3 x 108
5.8 x 102
234
U
4.76
3.0
7.04 x 108 y
7.9 x 104
7.1 x 10-4
235
U
4.40
0.08
236
2.34 x 107 y
2.3 x 106
2.4 x 10-2
U
4.48
2.9
238
4.47 x 109 y
1.2 x 104
8.3 x 10-5
U
4.19
0.028
237
2.14 x 106 y
2.6 x 107
3.4 x 10-1
Np
4.77
6.4 x 1011
1.34 x 104
2.2 x 106
238
Pu
87.74 y
5.49
2.41 x 104 y
2.3 x 109
3.81 x 101
5.6 x 103
239
Pu
5.15
6.56 x 103 y
8.4 x 109
1.41 x 102
2.1 x 104
240
Pu
5.15
5.90 x 105 y
9.4 x 107
1.7 x 102
241
Pu
4.89
1.3
3.76 x 105 y
1.4 x 108
2.7 x 102
242
Pu
4.90
2.0
1.3 x 1011
2.69 x 103
241
Am
433.6 y
5.48
1.2 x 1014
3.76 x 106
242
Cm
163 days
6.10
3.0 x 1012
7.73 x 104
244
Cm
18.1 y
5.80
6.6 x 104 y
8.8 x 108
1.8 x 101
249
Bk
5.40
1013
6.0 x 105
252
Cf
2.646 y
1.9 x
6.11
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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