Rb-81 + Rb-82m

Rubidium-81

Half-life: 4,58 hours

Main emission lines: 190keV, 446keV, 511keV

Decay chain: Kr-81, Br-81

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Rubidium-82m

Half-life: 4,58 hours

Main emission lines: 554keV, 698kev, 1044keV, 1317keV, 1474keV

Decay chain: Kr-82

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Where detected

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Rubidium-81 is used in Krypton-81m generators. Kr-81m has also been used for ventilation imaging. Short half-life of 13 seconds allow equilibrium imaging of the lungs in multiple projections. However, the short half-life precludes obtaining single-breath and washout images. Kr-81m is obtained from rubidium-81, which has a half-life of 4.6 hours. While krypton generators are available, the cost of the generator can be quite high, due to the short half-life of rubidium-81. The activity administered is 1 to 10 mCi.