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Half-life: 4.468 billion years, Common Usage: Dating geological formations, and is a source for other radioactive isotopes.

Half-life: 432.2 years, Common Usage: Smoke detectors and neutron sources.

Half-life: 22.3 years, Common Usage: Used in studies of sedimentation and atmospheric processes.

Half-life: 10.76 years, Common Usage: Industrial gauge fluid and leak detection.

Half-life: 28.8 years, Common Usage: Used in radioisotope thermoelectric generators (RTGs) and in medical applications.

Half-life: 138.4 days, Common Usage: Used as a heat source in satellite power systems and to eliminate static charges in machinery.

Half-life: 5.27 years, Common Usage: Radiation therapy for cancer treatment, and industrial radiography.

Half-life: 8 days, Common Usage: Medical diagnostics and treatment, particularly for thyroid conditions.

Half-life: 703.8 million years, Common Usage: Main fuel for nuclear reactors and nuclear weapons.