Techniques for improving shuffler assay results for 55-gallon waste drums
Conference
·
OSTI ID:10171027
- Los Alamos National Lab., NM (United States)
- University of Michigan (United States). Dept. of Nuclear Engineering
Accurate assays of the fissile contents in waste drums are needed to ensure the most proper and economical handling and disposal of the waste. An improvement of accuracy will mean fewer drums disposed as transuranic waste when they really contain low-level waste, saving both money and burial sites. Shufflers are used for assaying waste drums and are very accurate with nonmoderating matrices (such as iron). In the active mode they count delayed neutrons released after fissions are induced by irradiation neutrons from a {sup 252}Cf source. However, as the hydrogen density from matrices such as paper or gloves increases, the accuracy can suffer without proper attention. The neutron transport and fission probabilities change with the hydrogen density, causing the neutron count rate to vary with the position of the fissile material within the drum. The magnitude of this variation grows with the hydrogen density.
- Research Organization:
- Los Alamos National Lab., NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 10171027
- Report Number(s):
- LA-UR--94-2257; CONF-940748--38; ON: DE94016076
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
440100
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
664200
74 ATOMIC AND MOLECULAR PHYSICS
CALIFORNIUM 252
CONTAINERS
FISSILE MATERIALS
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12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
440100
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
664200
74 ATOMIC AND MOLECULAR PHYSICS
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CONTAINERS
FISSILE MATERIALS
LOW-LEVEL RADIOACTIVE WASTES
NONDESTRUCTIVE ANALYSIS
RADIATION DETECTORS
RADIATION INSTRUMENTATION
RADIOACTIVE WASTE DISPOSAL
RADIOACTIVE WASTE MANAGEMENT
SPECTRA OF ATOMS AND MOLECULES AND THEIR INTERACTIONS WITH PHOTONS
WASTE DISPOSAL AND STORAGE
X-RAY EMISSION ANALYSIS