147815 The half-life of ${ }_{43} \mathrm{TC}^{99}$ is 6 hours. If $12 \mathrm{mg}$ of ${ }_{43} \mathrm{Tc}^{99}$ is injected to a patient, after 24 hours how much Te will be left in the patient's body?

147816 Tritium's half life is 12.5 years for beta decay. What fraction of pure tritium would remain undecayed after 50 years?

147817 Ba-122 has half life of $2 \mathrm{~min}$. Experiment has to be done using Ba- 122 and it takes 10 min to set up the experiment. If initially $80 \mathrm{~g}$ of $\mathrm{Ba}-122$ was taken, how much $B a$ was left when experiment was started?

147819 The activity of a radioactive sample is 600 disintegrations per second (d.p.s.) after 28 days. After another 14 days, the activity reduces to 300 d.p.s. The initial activity of the sample is

147815 The half-life of ${ }_{43} \mathrm{TC}^{99}$ is 6 hours. If $12 \mathrm{mg}$ of ${ }_{43} \mathrm{Tc}^{99}$ is injected to a patient, after 24 hours how much Te will be left in the patient's body?

147816 Tritium's half life is 12.5 years for beta decay. What fraction of pure tritium would remain undecayed after 50 years?

147817 Ba-122 has half life of $2 \mathrm{~min}$. Experiment has to be done using Ba- 122 and it takes 10 min to set up the experiment. If initially $80 \mathrm{~g}$ of $\mathrm{Ba}-122$ was taken, how much $B a$ was left when experiment was started?

147819 The activity of a radioactive sample is 600 disintegrations per second (d.p.s.) after 28 days. After another 14 days, the activity reduces to 300 d.p.s. The initial activity of the sample is

147815 The half-life of ${ }_{43} \mathrm{TC}^{99}$ is 6 hours. If $12 \mathrm{mg}$ of ${ }_{43} \mathrm{Tc}^{99}$ is injected to a patient, after 24 hours how much Te will be left in the patient's body?

147816 Tritium's half life is 12.5 years for beta decay. What fraction of pure tritium would remain undecayed after 50 years?

147817 Ba-122 has half life of $2 \mathrm{~min}$. Experiment has to be done using Ba- 122 and it takes 10 min to set up the experiment. If initially $80 \mathrm{~g}$ of $\mathrm{Ba}-122$ was taken, how much $B a$ was left when experiment was started?

147819 The activity of a radioactive sample is 600 disintegrations per second (d.p.s.) after 28 days. After another 14 days, the activity reduces to 300 d.p.s. The initial activity of the sample is

147815 The half-life of ${ }_{43} \mathrm{TC}^{99}$ is 6 hours. If $12 \mathrm{mg}$ of ${ }_{43} \mathrm{Tc}^{99}$ is injected to a patient, after 24 hours how much Te will be left in the patient's body?

147816 Tritium's half life is 12.5 years for beta decay. What fraction of pure tritium would remain undecayed after 50 years?

147817 Ba-122 has half life of $2 \mathrm{~min}$. Experiment has to be done using Ba- 122 and it takes 10 min to set up the experiment. If initially $80 \mathrm{~g}$ of $\mathrm{Ba}-122$ was taken, how much $B a$ was left when experiment was started?

147819 The activity of a radioactive sample is 600 disintegrations per second (d.p.s.) after 28 days. After another 14 days, the activity reduces to 300 d.p.s. The initial activity of the sample is