The radioactive nuclide platinum-199 has a half-life of 30.8 minutes. A sample is prepared that has an initial activity of 5.67 x 1011 Bq. (a) How many platinum-199 nuclei are initially present in the sample? (b) How much of this nuclei will be left after 92.4 minutes?

You have a sample of unknown medication that is radioactive. You believe you should be able to identify the medication if you can deduce its half-life. You measure its initial activity as 2.30e+06 Bq. 10.4 hours later you measure its activity as 8.10e+05 Bq. a) What is the half-life of this unknown sample? hour b) How many nuclides are present when the activity is 8.10e+05 Bq?

Using the data from Table 1, how much energy is released in the fusion of deuterium 12 D and tritium 13T   if helium and a neutron are formed in the reaction? Question 33 options: a 5.98 x 10-10 J b 7.48 x 10-10 J c 1.70 x 1015 J d 2.81 x 10-12 J

Another series of nuclear reactions that can produce energy in the interior of stars is the cycle described below. This cycle is most efficient when the central temperature in a star is above 1.6 × 107 K. Because the temperature at the center of the Sun is only 1.5 × 107 K, the following cycle produces less than 10% of the Sun’s energy. (a) A high-energy proton is absorbed by 12 C. Another nucleus, A , is produced in the reaction, along with a gamma ray. Identify nucleus A decays through positron emission to form nucleus B. (c) Nucleus B absorbs a proton to produce nucleus C and a gamma ray. Identify nucleus C absorbs a proton to produce nucleus D and a gamma ray. Identify nucleus D. (e) Nucleus D decays through positron emission to produce nucleus E. Identify nucleus E. (f) Nucleus E absorbs a proton to produce nucleus F plus an alpha particle. What is nucleus F ? Note: If nucleus F is not 12C—that is, the nucleus you started with—you have made an error and should review the sequence…

A 14 Gram ovarian tumor is treated using a sodium phosphate in which the phosphorus atoms are the radioactive phosphorus 32 isotopes with half life of 14.3 days and which decays via beta emission with energy of 1.71Mev.Half of the sodium phosphate solution is absorbed by the tumor and deposits 9.0J of energy into it. The other half of the solution is dispersed through out the patients tissue and also depositing 9.0j energy into the 50kg of body tissue. I. What dose in (gray and rem) that the tumor receives. Ii. What is the dose in (mill gray and rem) that the tissue receives

Thorium  22890Th produces a daughter nucleus that is radioactive. The daughter, in turn, produces its own radioactive daughter, and so on. This process continues until bismuth 21883Bi is reached. What are (a) the total number Nα of α particles and (b) the total number Nβ of β- particles that are generated in this series of radioactive decays?

Question 3. Two nuclei having the same mass number are known as isobars. (a)Calculate the difference in binding energy per nucleon for the following two isobars Na and Mg. (b) How do you account for this difference? (The mass of ?3Mg = 22.994 127 u.) 23

The uranium decay series from U-238 to stable lead (Pb-206) is: U → Th → *Pa → U → 0Th → Ra → Rn → 18Th → Pb → Bi 238U 234TH 226 → Po 92 92 210Pb → 210 Bi → 210P0 → 206Pb 83 84 Of the 15 nuclei from U-238 to Pb-206, list those radionuclides that are alpha-particle emitters, and those that are beta-particle emitters. State your reasons.

Time 0 t₁2 20₁2 3₁/12 Number of nuclides, N x 10³ 1000 750 500 90/2 10/₁2 250 125 0 12 212 312 412 512 612 7h2 8h2 9h12 10/2 Time in multiples of t₁/2 The figure shows a typical radioactive decay (amount of undecayed nucleus (N) vs. time (t)) from a heavy nucleus. Such a decay may be best expressed by an equation like : ON = N₂ (xt) ON=N₂/λt -λt ON = N₂e N = N₂ e-1/At N 1,000,000 500,000 250,000 125,000 62,500 31,250 15,625 7,813 3,906 1,953 977 412 5/₁/2 61₁2 7h2 81/2

The nucleus of a fictitious element consists of 15 protons and 16 neutrons. The mass of the respective atom is 31.021 u. Calculate the nuclear binding energy per nucleon, in MeV. The mass of the hydrogen atom is 1.007825 u, the mass of the neutron is 1.008665 u.