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==Properties== 64Cu has a half-life of 12.701 ± 0.002 hours and decays by 17.86 (± 0.14)% by positron emission to 64Ni, 39.0 (± 0.3)% by beta decay to 64Zn, 43.075 (± 0.500)% by electron capture to 64Ni, and 0.475 (± 0.010)% gamma radiation/internal conversion. These emissions are 0.5787 (± 0.0009) and 0.6531 (± 0.0002) MeV for beta minus and positron respectively and 1.35477 (± 0.00016) MeV for gamma.〔Monographie BIPM-5, Table of radionuclides, published in three volumes with accompanying comments: Table of contents Bé M.-M., Chisté V., Dulieu C., Browne E., Chechev V., Kuzmenko N., Helmer R., Nichols A., Schönfeld E., Dersch R., Vol. 1 (2004, 285 pp), Vol. 2 (2004, 282 pp) and Comments on the 2004 evaluation (Vols. 1-2) (2004, 474 pp); Bé M.-M., Chisté V., Dulieu C., Browne E., Baglin C., Chechev V., Kuzmenko N., Helmer R., Kondev F., MacMahon D., Lee K.B., Vol. 3 (2006, 210 pp) and Comments on the 2006 evaluation (Vol. 3) (2006, 186 pp).〕 The main oxidation states of copper are I and II since Cu3+ is too powerful to exist in biochemical systems. Furthermore, copper(I) exists as a strong complex in aqueous solution and is not often seen. Copper(II) forms mononuclear complexes that are paramagnetic and prefers ligands of sulfur and nitrogen.〔Welch, Michael J. and Carol S. Redvanly. Handbook of Radiopharmaceuticals. England: John Wiley and Sons, 2003.〕 Copper is essential in the human body as both a catalyst and as part of enzymes. Copper is mainly involved in redox reactions throughout the body, but also plays a role in iron transportation in blood plasma. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Copper-64」の詳細全文を読む スポンサード リンク
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