Obtain the amount of `.^60Co` necessary to provide a radioactive source of `8.0 Ci` strength. The half-life of `.^60Co` is `5.3` years?

If 8.0 g of radioactive isotope has a half-life of 10 h, the half-life of 2.0 g of the same substance is

Spontaneous and continuous disintegration of a nucleus of a heavy element with the emissio of cer tain type os radiation is known as radioactivity. Tritium has a half-life of 12.5 years. What frac tion of a sample of pure tritium will remain undecayed after 50 years?

The half-life period of ""_(53)I^(125) is 60 days. What percent of radioactivity would be present after 240 days ?

During nuclear explosion, one of the products is 90_{Sr} with half-life of 28.1 years. If 1 mu g of 90_{Sr} was absorbed in the bones of a newly born baby instead of calcium, how much of it will remain after 10 years and 60 years if it is not lost metabolically.

The radioactive isotope of caesium - 137 of weight 8 g was collected on 1st February, 2006 and kept in a sealed tube. On 1st July 2006 it was found that only 0.25 g of it remained. The half-life period of the isotope is

The radioactive element, Thallium-201, is used medicinally as a radiotracer to study damage in heart tissue. If a patient is injected with a 0.950 g dose of pure Thallium-201, calculate the amount of time that would be required for the amount of Thallium-201 in the patient's body to reach 0.0500 g. Thallium-201 decays by a first order process with a half-life, t_(1//2) = 73.0 hrs.