Final answer:
Rb-82 is produced from Sr-82 and has a short half-life of about 1.273 minutes, necessitating on-demand production for uses such as medical imaging.
Step-by-step explanation:
Rubidium-82 (Rb-82) is produced through the decay of strontium-82 (Sr-82). Sr-82 is generated in a cyclotron by the proton irradiation of naturally occurring strontium.
Rb-82 has a very short half-life of approximately 1.273 minutes (76.38 seconds), making it useful for medical imaging but requiring it to be produced on-demand, typically using a generator. Since the half-life is so short, Rb-82 has to be used relatively quickly after its production, and it decays into a stable isotope of krypton (Kr-82).