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Radiation Detection and Evaluation |
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| 0183im.jpg) DOE-STD-1128-98
Guide of Good Practices for Occupational Radiological Protection in Plutonium Facilities
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
(cm-2s-1)
(MeV)
2
2.5 X 10 -8 . . . . . . Thermal
6.80680560561e+51
2
1 x 10 -7 . . . . . . . . . . . . . . . .
2
1 x 10 -6 . . . . . . . . . . . . . . . .
2
1 x 10 -5 . . . . . . . . . . . . . . .
2
1 x 10 -4 . . . . . . . . . . . . . . .
2
1 x 10 -3 . . . . . . . . . . . . . . . .
2.5
1 x 10 -2 . . . . . . . . . . . . . . . .
7.5
1 x 10 -1 . . . . . . . . . . . . . . . .
11
5 x 10 -1 . . . . . . . . . . . . . . . .
11
1 ......................
9
2.5 . . . . . . . . . . . . . . . . . . . . .
8
5 ......................
7
7 ......................
6.5
10 . . . . . . . . . . . . . . . . . . . . .
7.5
14 . . . . . . . . . . . . . . . . . . . . .
8
20 . . . . . . . . . . . . . . . . . . . . .
7
40 . . . . . . . . . . . . . . . . . . . . .
5.5
60 . . . . . . . . . . . . . . . . . . . . .
1 x 102 . . . . . . . . . . . . . . . . .
4
2 x 102 . . . . . . . . . . . . . . . . .
3.5
3 x 102 . . . . . . . . . . . . . . . . .
3.5
4 x 102 . . . . . . . . . . . . . . . . .
3.5
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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