Rubidium-87 (⁸⁷Rb)

Tsarin ruɓewar ⁸⁷Rb-⁸⁷Sr yana ɗaya daga cikin mahimman hanyoyin haɗuwa da rediyoaktif kuma ya dace da haɗuwa da tsoffin duwatsu (kamar granite da meteorites). Ruɓewar sa ta kasance λ=1.42×10⁻¹¹ yr⁻¹. Ta hanyar auna rabon ⁸⁷Sr/⁸⁶Sr da ⁸⁷Rb/⁸⁶Sr, tare da hanyar isochron, ana iya ƙididdige shekarun ƙasa, kuma tsawon lokacin zai iya kaiwa biliyoyin shekaru. Wannan fasaha tana taka muhimmiyar rawa wajen nazarin juyin halittar ɓawon duniya, tarihin samuwar wata da meteorites.

⁸⁷Rb yana ɗaya daga cikin muhimman abubuwan kimiyyar lissafi mai sanyi, kuma layinsa na D₂ (780.24 nm, 5²S₁/₂→5²P₃/₂) sauyi ne na yau da kullun a cikin gwaje-gwajen sanyaya laser da kuma na Bose-Einstein condensation (BEC). Tsarin yanayin ƙasa mai ƙarfi (F=1,2) na ⁸⁷Rb ana iya amfani da shi don auna daidaito, kamar agogon atomic (daidaitaccen mitar agogon rubidium ~6.834682 GHz) da gwaje-gwajen kwaikwayo na quantum. Bugu da ƙari, halayen resonance na Feshbach na ⁸⁷Rb suna sa ya jawo hankali sosai a cikin shirye-shiryen kwayoyin halitta masu sanyi da bincike na jikin mutum mai yawa.

Ana iya samar da ⁸⁷Rb ta hanyar kunna neutron na ⁸⁶Rb (n,γ), kuma isotope ɗinsa na ɗan gajeren lokaci ⁸²Rb (T₁/₂=min 1.27) wakili ne na ɗaukar hoton perfusion na myocardial don positron emission tomography (PET) kuma ana amfani da shi don gano cututtukan zuciya. Kodayake ⁸⁷Rb da kanta ba a amfani da shi kai tsaye a magani ba, samfuran sarkar ruɓewa (kamar ⁸⁷Sr) suna da takamaiman ƙimar tunani a cikin binciken metabolism na ƙashi.

⁸⁷Rb yana da raunin aikin rediyo (aiki na musamman ~3.2×10⁻⁴ Bq/g), kuma yawanci baya buƙatar kariya ta musamman, amma tsawon lokaci yana buƙatar a guji fallasa shi ga mahaɗan ⁸⁷Rb masu yawan maida hankali (kamar RbCl) daga shaƙa ko shaƙa. A cikin dakin gwaje-gwaje, sau da yawa ana adana ⁸⁷Rb a cikin nau'in chloride ko carbonate kuma yana buƙatar a rufe shi don hana danshi.