Curium
curium · curium atom
Identifikatoren & physikalische Daten
| CAS No. | 22541-42-0 |
|---|---|
| Summenformel | Cm |
| Durchschnittliche Molmasse | 247,0704 g/mol |
| Monoisotopische Masse | 247,07035 g/mol |
| SMILES | [Cm] |
| InChIKey | NIWWFAAXEMMFMS-UHFFFAOYSA-N |
| PubChem CID | 23979 |
| ChEBI | CHEBI:33390 |
| DTXSID | DTXSID80225390 |
Chemische & physikalische Eigenschaften
| Polarare Oberfläche (TPSA) | 0 |
|---|---|
| H-Brücken-Donoren | 0 |
| H-Brücken-Akzeptoren | 0 |
| Frei drehbare Bindungen | 0 |
| Schwere Atome | 1 |
| Formalladung | 0 |
| Komplexität | 0 |
| Stoffklassen | Physical/Radiation -> Radionuclides |
| SpringerMaterials Properties | nuclear state |
| Physical Description | A man-made radioactive metal with a melting point of 1345 degrees CKnown isotopes have mass numbers of 238-251Cm-247 is the isotope with the longest half life[Merck Index # 2675] |
| Schmelzpunkt | 1345° |
| Siedepunkt | bp (calc) 3110° |
| Dichte | 13.51d 12.9 |
| Aggregatzustand | silvery metal |
| Farbe | silvery metalhexagonal, hexane or cubic |
| EPA chemische Informationen | Curium (7440-51-9) |
Sicherheit & Vorschriften
| Gefahrenübersicht | Most Important Radionuclide: Cu-244 Source: Nuclear reactors Half-Life: 18 years Effective Half-Life: 16.7 years Specific Activity: 82 Ci/g Decay Mode: Alpha GI Absorption: 0.05% Lung Clearance Half-Time: Weeks (10-100 days) for all compoundsCritical Organ: Liver Internal Toxicity: Very High Annual Limit on Intake: 0.000001 mCi Average Radiation Energy (MeV): Alpha 5.8Beta 0.086Gamma 0.0017[Argonne] [See Glossary for references.] See Radiation, ionizing. |
|---|
Anwendungen & Verwendung
Occurrence
There is no natural curium on Earth. All of its isotopes are man-made and artificiallyproduced through nuclear reactions with other elements. The curium isotope Cm-242 wasfirst produced by bombarding plutonium-239 with helium nuclei (alpha particles), whichcontributed neutrons that changed 94Pu to 96Cm.
Verwenden
There are no major commercial uses for curium because of the extremely small amountproduced. In the future, the most important use of curium may be to provide the power forsmall, compact thermoelectric sources of electricity, by generating heat through the nucleardecay of radioisotope curium-241. These small, efficient power sources can be used in individualhomes or remote regions to provide electricity to areas that cannot secure it from othersources. It could also be used as a source of electricity in spacecraft. However, today curium’smain use is for basic scientific laboratory research.