Gamma Ray Mirrors for Direct Measurement of Spent Nuclear Fuel

Journal Article · Wed Jan 01 00:00:00 EST 2014 · Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

DOI:https://doi.org/10.1016/j.nima.2014.01.005· OSTI ID:1130423

Pivovaroff, Dr. Michael J. ^[1]; Ziock, Klaus-Peter ^[2]; Harrison, Mark J ^[2]; Soufli, Regina ^[1]

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1. Lawrence Livermore National Laboratory (LLNL)
2. ORNL

Direct measurement of the amount of Pu and U in spent nuclear fuel represents a challenge for the safeguards community. Ideally, the characteristic gamma-ray emission lines from different isotopes provide an observable suitable for this task. However, these lines are generally lost in the fierce flux of radiation emitted by the fuel. The rates are so high that detector dead times limit measurements to only very small solid angles of the fuel. Only through the use of carefully designed view ports and long dwell times are such measurements possible. Recent advances in multilayer grazing-incidence gamma-ray optics provide one possible means of overcoming this difficulty. With a proper optical and coating design, such optics can serve as a notch filter, passing only narrow regions of the overall spectrum to a fully shielded detector that does not view the spent fuel directly. We report on the design of a mirror system and a number of experimental measurements.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1130423
• Journal Information: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 743, Issue 1; ISSN 0168-9002
• Country of Publication: United States
• Language: English

Related Subjects

multilayer mirrors
spent nuclear fuel
nondestructive assay