Release and Migration of Activation Products of Corrosion-Resistant Metal Specimens in Marine Sediments

摘要

The experiment was designed to measure the release and migration of the neutron-activated radionuclides. Ni-63, Co-60, and Fe-55, from two types of corrosion-resistant alloys, Incone1-600 and SS-347 into marine sediments. On 11 August 1982 six 50 cm long probes were deployed at Deep Ocean Site 2 (DOS-2). Each probe held 5 metal specimens such that each specimen would be exposed to sediment at depths of approximately 3,7,15,25, and 40 cm. Three probes held Incone1-600 specimens and three held SS-347. On July 17, 1983, one probe of each type of metal (probes 3 and 5) was recovered. The extrusion and subsectioning procedure as well as the analytical methods and results from these cores were described in detail in the previous report. The integrated release rates for the three nuclides fell between 0.02-13 nCi/sq cm/yr for Incone1-600 and 0.007 to 0.36 nCi/sq cm/yr for SS-347. Estimated diffusion coefficients were between 10 to the minus 8th to 9th power sq cm/sec for the three nuclides.