A bone sample containing strontium-90 (t₁/₂ = 29 yr) emits7.0X10⁴ β⁻ particles per month. How long will it take for the emission to decrease to 1.0X10⁴ particles per month?

Strontium-90 (Sr-90) is a radioactive isotope that is produced in nuclear fission, the splitting of an atom's center that releases energy. Sr-90 has a half-life of about 29 years and emits a beta particle as it decays.

Sr-90 is used as a radioactive tracer in medical and agricultural studies. The heat generated as Sr-90 radioactively decays can be converted to electricity for long-lived, light-weight power supplies. Some examples are navigational beacons, weather stations, and space vehicles.

Sr-90 comes from three sources:

fallout from above-ground explosions of nuclear weapons testing worldwide from 1963 to 1980;
radioactive releases from the 1986 Chernobyl nuclear power plant accident in the Ukraine; and
radioactive releases from nuclear power plants into the environment.

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