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Page Title:
Table 6 -8. Gamma Flux and Ratios at Various Locations and Sources at Fernald Plant |
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|  DOE-STD-1136-2004
Guide of Good Practices for Occupational Radiation Protection in Uranium Facilities
Table 6 -8. Gamma Flux and Ratios at Various Locations and Sources at Fernald Plant
Integrated Gamma Flux, photons/cm2/sec
Source Description or Location
30 to 225 keV
675 to 1050 keV
Ratio
Crucible load station - 55-gal. drum
990
348
2.8
159
3.4
Beside UO3 barrel
538
Open UO3 barrel
919
232
4.0
Tube-cutting work station, metal
253
58
4.4
Outside Plant 9 south entrance, near
776
165
4.7
exhaust fan
Box of black top crop at 25 cm
848
154
5.5
Lathe work station
424
76
5.6
Background outside Building 3045
35
5
7.0
Near "thorium" hopper
424
58
7.3
Plant 9 west wing, SW hot area
72
708
9.8
Crucible burnout station
776
69
11.2
Plant 9 HP change room
<0.4
12.5
5
Background 75 ft from Bldg. 3045
25
2
12.5
Graphite crucible (G-8010) 30 cm
183
11
16.6
Graphite crucible (3898) 30 cm
310
18
17.2
6.3.3 Portable Survey Instruments --Neutron Response
The need for neutron surveys at uranium facilities depends on the quantity of uranium present, its
form, and the potential for (a,n) reactions, such as occurs with uranium fluoride. In facilities where such
monitoring is required, selection of instruments wit h appropriate energy characteristics is important
because of the energy and angular dependence with most instruments. Fortunately, uranium compounds
emit neutrons in the MeV range, where problems with energy and angular dependence are minimal.
Calibration with sources that emit neutron energies similar to those in the facility will assist in accurately
6-17
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