Rubidium-87 (⁸⁷Rb)

Lub kaw lus lwj ⁸⁷Rb-⁸⁷Sr yog ib qho ntawm cov txheej txheem tseem ceeb ntawm kev suav hnub nyoog radioactive thiab nws tsim nyog rau kev suav hnub nyoog pob zeb qub (xws li granite thiab meteorites). Nws qhov lwj tas li λ = 1.42 × 10⁻¹¹ yr⁻¹. Los ntawm kev ntsuas qhov piv ntawm ⁸⁷Sr / ⁸⁶Sr thiab ⁸⁷Rb / ⁸⁶Sr, ua ke nrog txoj kev isochron, lub hnub nyoog geological tuaj yeem suav tau, thiab lub sijhawm tuaj yeem ncav cuag billions xyoo. Cov thev naus laus zis no ua lub luag haujlwm tseem ceeb hauv kev kawm txog kev hloov pauv ntawm lub ntiaj teb lub plhaub, keeb kwm tsim ntawm lub hli thiab meteorites.

⁸⁷Rb yog ib qho ntawm cov ntsiab lus tseem ceeb ntawm kev siv tshuab atomic txias, thiab nws txoj kab D₂ (780.24 nm, 5²S₁/₂→5²P₃/₂ hloov pauv) yog ib qho kev hloov pauv ntau hauv kev txias laser thiab Bose-Einstein condensation (BEC) kev sim. Lub xeev av hyperfine qauv (F = 1,2) ntawm ⁸⁷Rb tuaj yeem siv rau kev ntsuas qhov tseeb, xws li atomic moos (rubidium atomic moos zaus tus qauv ~ 6.834682 GHz) thiab quantum simulation kev sim. Tsis tas li ntawd, Feshbach resonance yam ntxwv ntawm ⁸⁷Rb ua rau nws nyiam ntau qhov kev saib xyuas hauv kev npaj molecular ultracold thiab quantum ntau lub cev kev tshawb fawb.

⁸⁷Rb tuaj yeem tsim los ntawm kev ua haujlwm ntawm neutron ntawm ⁸⁶Rb (n,γ), thiab nws cov isotope luv luv ⁸²Rb (T₁/₂=1.27 min) yog tus neeg sawv cev rau kev thaij duab myocardial perfusion rau positron emission tomography (PET) thiab siv rau kev kuaj mob ntawm tus kab mob plawv coronary. Txawm hais tias ⁸⁷Rb nws tus kheej tsis tau siv ncaj qha hauv kev kho mob, nws cov khoom lwj (xws li ⁸⁷Sr) muaj qee qhov txiaj ntsig hauv kev tshawb fawb txog kev hloov pauv ntawm pob txha.

⁸⁷Rb muaj cov tshuaj radioactivity tsis muaj zog (kev ua haujlwm tshwj xeeb ~3.2 × 10⁻⁴ Bq/g), thiab feem ntau tsis xav tau kev tiv thaiv tshwj xeeb, tab sis kev raug rau lub sijhawm ntev rau cov tshuaj ⁸⁷Rb uas muaj ntau (xws li RbCl) tseem yuav tsum tau zam kom tsis txhob ua pa lossis noj. Hauv chav kuaj mob, ⁸⁷Rb feem ntau khaws cia rau hauv daim ntawv ntawm chloride lossis carbonate thiab yuav tsum tau kaw kom tiv thaiv kom tsis txhob muaj dej noo.