β Scribed by J.A. Church; D.R. Slaughter; S. Asztalos; P. Biltoft; M.-A. Descalle; J. Hall; T. Luu; D. Manatt; J. Mauger; E.B. Norman; D. Petersen; S. Prussin
No coin nor oath required. For personal study only.
The screening of sea-going cargo containers for highly enriched uranium (HEU) and other fissile material is a challenging problem. This is due in part to the cargo itself, which acts as an attenuator to any radiation that might signal its presence. In the nuclear car wash, b-delayed high-energy c-rays following neutron-induced fission are utilized as this signal. The delayed c-rays above 3 MeV are highly penetrating and have energies above natural background radiation. In addition, the half-lives of most fission products emitting c-rays at these energies are less than 160 s, making it feasible to construct decay curves on a time scale which preserves the flow of commerce through the port. A particular goal of the project is to understand the rate of false alarms. To this end, experiments are underway to investigate possible interferences, and to understand variations in the overall c-ray background. The experiments and preliminary results are discussed. Work performed under the auspices of the DOE by the UC LLNL W7405Eng4,UCRL-PROC-224803.
π SIMILAR VOLUMES
LLNL is actively involved in the development of advanced technologies for use in detecting threats in sea-going cargo containers, particularly the presence of hidden special nuclear materials (SNM). The ''Nuclear Car Wash'' (NCW) project presented here uses a high-energy (E n % 3.5-7.0 MeV) neutron
## Abstract The CARS spectra of gasβphase molecules have contributions from both real and imaginary components of the thirdβorder nonβlinear susceptibility. When the spectral lines are closely spaced as in the highβresolution CARS spectra (e.g. Λ 0.03 cm^β1^) of the __Q__βbranches of diatomic molec