Question: What does rubidium decay into?

The radioactive decay of rubidium-87 (87Rb) to strontium-87 (87Sr) was the first widely used dating system that utilized the isochron method. Rubidium is a relatively abundant trace element in Earths crust and can be found in many common rock-forming minerals in which it substitutes for the major element potassium.

How old are rocks dated by the rubidium strontium method?

The method is applicable to very old rocks because the transformation is extremely slow: the half-life, or time required for half the initial quantity of rubidium-87 to disappear, is approximately 50 billion years.

Why is cesium-137 used?

Cesium Sources Cesium-137 is used in small amounts for calibration of radiation detection equipment, such as Geiger-Mueller counters. In larger amounts, Cs-137 is used in: Medical radiation therapy devices for treating cancer. Industrial gauges that detect the flow of liquid through pipes.

How long will it take for all the cesium-137 to decay into barium 137?

Cesium-137 emits beta particles as it decays to the barium isotope, Ba-137m (half life = 2.6 minutes).

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