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All sourcesNASA NTRSDOE OSTI
DOE OSTI2026

Evaluation of the Radiological Characterization for Off-Site Source Recovery Program Waste Streams LA-OS-00-01.001, LA-OS-00-03, and LA-OS-00-04

The purpose of this memorandum is to satisfy the requirements of Section 4.4 of the CCP Acceptable Knowledge Documentation procedure CCP-TP-005 (Ref. 1). This evaluation is updating the previously issued memo NEN3:24-045 issued in August 2024. CCP-TP-005 requires an AK Expert and the OSRP group to evaluate the radionuclide characterization of a waste stream and prepare the NDA Memorandum (letter to CCP Records). This NDA memorandum was written with input from the OSRP group, as required by CCP-TP-005. This memo includes a discussion of the limitations for the radiological characterization and a description of the characterization method.

07 ISOTOPE AND RADIATION SOURCES↗
DOE OSTI2020

Materials Data on LaOs2 by Materials Project

LaOs2 is Cubic Laves structured and crystallizes in the cubic Fd-3m space group. The structure is three-dimensional. La3+ is bonded in a 12-coordinate geometry to twelve equivalent Os+1.50- atoms. All La–Os bond lengths are 3.22 Å. Os+1.50- is bonded to six equivalent La3+ and six equivalent Os+1.50- atoms to form a mixture of edge, face, and corner-sharing OsLa6Os6 cuboctahedra. All Os–Os bond lengths are 2.74 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on LaOs2 by Materials Project

LaOs2 is Hexagonal Laves structured and crystallizes in the orthorhombic Cmcm space group. The structure is three-dimensional. La3+ is bonded in a 12-coordinate geometry to twelve Os+1.50- atoms. There are a spread of La–Os bond distances ranging from 3.15–3.30 Å. There are three inequivalent Os+1.50- sites. In the first Os+1.50- site, Os+1.50- is bonded to six equivalent La3+ and six Os+1.50- atoms to form a mixture of edge, face, and corner-sharing OsLa6Os6 cuboctahedra. All Os–Os bond lengths are 2.81 Å. In the second Os+1.50- site, Os+1.50- is bonded to six equivalent La3+ and six Os+1.50- atoms to form a mixture of edge, face, and corner-sharing OsLa6Os6 cuboctahedra. There are a spread of Os–Os bond distances ranging from 2.63–2.75 Å. In the third Os+1.50- site, Os+1.50- is bonded to six equivalent La3+ and six Os+1.50- atoms to form a mixture of edge, face, and corner-sharing OsLa6Os6 cuboctahedra.

36 MATERIALS SCIENCE↗