Technecium

932 words - 4 pages

TechneciumTechnecium,chemická značka Tc, lat. Technetium je nejlehčí prvek v periodické soustavě, který nemá žádný stabilní izotop.Je to stříbrošedý a radioaktivní kov. Technecium se rozpouští pouze v koncentrované kyselině dusičné a lučavce královské. Zahřáto v atmosféře kyslíku shoří za vzniku těkavého oxidu technicistého Tc2O7.Ve sloučeninách vystupuje technecium nejčastěji jako sedmimocný kationTc7+, v silně oxidačn&iacut ...view middle of the document...

Technecium je supravodič I. typu, velice silně pohlcuje pomalé neutrony a je účinným inhibitorem koroze oceli, uhlíkatá ocel s přídavkem technicistanu draselného KTcO4 v množství okolo 50 ppm, má vynikající korozní odolnost i za velmi vysokých tlaků a teplot. Praktický význam technecium jako technický kov nemá.Technecium v medicíněVelmi významné je využití metastabilního radionuklidu 99mTc (T1/2 = 6 hod.) ve formě technicistanu sodného, jako čistého gama zářiče s energií fotonů 140 keV, v nukleární medicíně. Technecium má v jaderné medicíně dominantní postavení, více než 80% všech radiofarmak vychází z technecia. Mezi nejpoužívanější radiofarmaka značená techneciem patří např. 99mTc makroagregovaný albumin (MAA) pro detekci průchodnosti žiln&iacute...

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Technecium

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