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Table 6.9. Neutron Yields for Trace Impurities in Plutonium and Uranium - doe-std-1128-98_ch10170
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DOE Standard Guide of Good Practices for Occupational Radiological Protection In Plutonium Facilities
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Personnel Dosimetry - doe-std-1128-98_ch10172


DOE-STD-1128-98
QUALITY FACTORS FOR NEUTRONS
[Mean quality factors, Q (maximum value in a 30-cm dosimetry phantom), and values of neutron
flux density that deliver in 40 hours, a maximum dose equivalent of 100 mrem (0.001 sievert).]
Neutron energy
Mean quality Factor
Neutron flux density
(MeV)
(cm-2s-1)
680
2
2.5 x 10 -8..............Thermal
680
2
1 x 10 -7...........................
560
2
1 x 10 -6...........................
560
2
1 x 10 -5...........................
580
2
1 x 10 -4...........................
680
2
1 x 10 -3...........................
700
2.5
1 x 10 -2...........................
115
7.5
1 x 10 -1...........................
27
11
1 x 10 -1...........................
19
11
1....................................
20
9
2.5.................................
16
8
5....................................
17
7
7....................................
17
6.5
10..................................
12
7.5
14..................................
11
8
20..................................
10
7
40..................................
11
5.5
60..................................
14
4
1 x 10 2...........................
13
3.5
2 x 10 2............................
11
3.5
3 x 10 2...........................
10
3.5
4 x 10 2...........................
6.3
RADIATION DETECTION AND EVALUATION
This section describes the response of portable instruments, personnel dosimeters, and
nuclear accident dosimeters to the radiations emitted by plutonium, which are primarily
photons and neutrons. Data are also included on special spectrometry instruments used to
calibrate dosimeters in the field.
6.3.1
Response of Portable Survey Instruments
The energy and angular responses of almost all portable gamma survey
instruments have been well characterized and published in the instruction
manuals available from the manufacturers. Because of the preponderance of low-
energy photons, especially the 60-keV photons emitted by 241Am, particular
attention should be given to the low-energy response.
6-19


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