List of top Physics Questions on Radioactive Decay asked in IIT JAM PH

An atomic nucleus X with half-life \( T_X \) decays to a nucleus Y, which has half-life \( T_Y \). The condition(s) for secular equilibrium is/are
In a typical human body, the amount of radioactive \(^{40}K\) is \(3.24 \times 10^{-5}\) percent of its mass. The activity due to \(^{40}K\) in a human body of mass 70 kg is .................. kBq.