AxxelWulf5864 AxxelWulf5864 19-12-2022 Chemistry Answered strontium-90 is a radioactive isotope that is formed in nuclear explosions. the half-life of strontium-90 is 28 years. if a soil sample contains 45 pci of strontium-90 in 2000, what will be the activity of the 90sr in this soil sample in 2084?