Authors:N. Wogman, H. Rieck, J. Kosorok, and R. Perkins
A seabed nuclear probe has been developed which permits the measurement of up to 33 elements at the parts per thousand to
parts per million levels in continental shelf areas. The probe consists of a neutron irradiation source,252Cf, which neutron activates the elements in the minerals of interest. These resulting radioactive elements emit characteristic
gamma radiation which is analyzed in situ in 2- to 10 min counting intervals with a Ge(Li) detector system. Details of the
irradiation source, the Ge(Li) detector, and spectra taken in situ in a marine environment are discussed with respect to the
detection of the minerals at concentrations of economic interest.
Authors:D. Robertson, V. Thomas, H. Rieck, D. Haggard, W. Reece, J. Pappin, W. Hensley, D. Brown, C. Thomas, and P. Robinson
Battelle, Pacific Northwest Laboratories has recently developed, tested and field-demonstrated a technology for the direct assay of transuranic radionuclides (TRU), fission products, and activation products in a variety of radwaste packages generated at commercial nuclear power plants. This technology involves non-destructive passive neutron counting for determination of nanocurie/gram quantities of the TRU radionuclides. Direct gamma spectrometry combined with thermoluminescent dosimetry (TLD) and correlation analysis is also utilized to determine the concentrations of the fission and activation products present in the radwaste packages. Employing counting times of 10 to 20 minutes, a complete analysis of all radionuclides specified for assay by the U.S. Nuclear Regulatory Commission (in 10CFR61) prior to shallow-land disposal of commercial radwastes can be measured at concentrations at least tenfold below the least restrictive Class A waste catagory.