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Uranium (U) has one very low sensitivity NMR active nucleus, 235U. It is quadrupolar and yields very broad signals even in the most symmetric of environments. Only UF6 has been observed by high resolution NMR so no chemical shift information is available. Published reports show that 235U NMR can be used for measuring isotopic enrichment in non-proliferation applications therefore its unpublished military application is obvious.
| Property | Value |
|---|---|
| Spin | 7/2 |
| Natural abundance | 0.7204% |
| Chemical shift range | unknown |
| Frequency ratio (Ξ) | 1.841800% |
| Reference compound | UF6 + 10% C6D6 |
| Linewidth of reference | ~25 Hz |
| T1 of reference | ~0.01 s |
| Receptivity rel. to 1H at natural abundance | 1.11 × 10-6 |
| Receptivity rel. to 1H when enriched | 1.54 × 10-4 |
| Receptivity rel. to 13C at natural abundance | 6.53 × 10-3 |
| Receptivity rel. to 13C when enriched | 0.906 |
| Linewidth parameter | unknown |
Some of the materials mentioned here are very dangerous. Ask a qualified chemist for advice before handling them. Qualified chemists should check the relevant safety literature before handling or giving advice about unfamiliar substances. NMR solvents are toxic and most are flammable. Specifically, uranium is radioactive. In addition, UF6 reacts with water to yield HF that is highly corrosive, dissolves glass, very toxic, causes serious burns and other nasty biological damage including death, requires special equipment (chemical hood, gloves, eye protection, 2.5% calcium gluconate gel to treat burns by application and/or injection, etc.) and special skills to handle.