The activity of a sample of a radioisotope at some time is 10.7 mCi and 0.36 h later it is 7.80 mCi. Determine the following. (a) Decay constant (in s-1) -1 (b) Half-life (in h) h
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- 45. A 60 Co source is labeled 6.1 mCi, but its present activity is found to be 2.03x107 Bq. (a) What is the present activity in mci? 0.549 mCi. Your last answer was interpreted as follows: 0.549 (b) How long ago in years did it actually have a 4.00-mCi activity? 17.6 years. Your last answer was interpreted as follows: 17.6 Correct answer, well done. Incorrect answer.Find the activity A of a sample containing 4E-6 g of 60/27 Co (T1/2= 5.27 years). (Use 59.93 u as the mass of 60/27 Co.) Radioactive decay constant: A)2.41E8 B)0.132 C)4.15E-9 D)7.60 Activity in curies: A)4.51E-3 Ci B)8.26E9 Ci C)1.43E8 Ci D)4.51 CiMY NOTES ASK YOUR TEACHER PRACTICE ANOTHER The activity of a sample of a radioisotope at some time is 10.7 mCi and 0.36 h later it is 7.80 mCi. Determine the following. (a) Decay constant (in s-ly 2.4e-4 V s-1 (b) Half-life (in h) 2887.916 How is the half-life related to the decay constant? h (c) Nuclei in the sample when the activity was 10.7 mCi 2887.916 How is the number of nuclei related to the decay constant and the activity? nuclei (d) Activity (in mCi) of the sample 3.30 h after the time when it was 10.7 mCi 2887.916 How is the activity of a radioactive sample at any time related to the activity at some time t = 0, the decay constant and time? mCi
- Naturally occurring 40K is listed as responsible for 40 mrem/y of background radiation. Calculate the mass of 40K in grams that must be inside the 54 kg body of a woman to produce this dose. Each 40K decay emits a 1.32 MeV B, and 59% of the energy is absorbed inside the body. gThe half life for the radioactive decay of Ce-141 is 32.5 days. If the sample has an activity of 4.0 úCi after 130 days have elapsed, what was the initial activity, in microcuries, of the sample?The half-life for the decay of carbon-14 is 5.73*10^3 years. Suppose the activity due to the radioactive decay of the carbon-14 in a tiny sample of an artifact made of wood from an archeological dig is measured to be 1.0*10^ 3Bq. The activity in a similar-sized sample of fresh wood is measured to be 6.9*10^3 Bq. Calculate the age of the artifact. Round your answer to 2 significant digits.
- d) A radioactive source has an activity of 3.6x107 Bq due to the decay of a radioisotope with a half-life of 7250 years. Calculate i) The decay constant ii) The initial number of atoms present.Determine the (a) mass defect and (b) binding energy of Fe-56 where its mass is 55.9349 u..Question 4. A syuthetic radioisotope is freshly prepared in a lab that has an ac- tivity of 10.0 mCi. If the activity of the radioisotope changes to 8.00 mCi, in 5.00 h, (a) What is the decay constant and half-life of the radioisotope in seconds? (b) How many atoms of the radioisotope were contained in the freshly prepared sam- ple? (e) What is the sample's activity in mCi 40.0 h after it is prepared?
- do it with good handwritingif the daughter nucleus in an a decay is 22488 Ra, what is the parent nucleus?Both 1)Given a half-life of a radioactive source is 435 years. Calculate the time taken for its activity to reduce from 4.5 Ci to 0.14 Ci? 2) Equation shows nuclear reaction of gamma radiation which incident on an isotope helium. Calculate the energy of the gamma ray in MeV unit? (Given mass of Helium = 3.016029 u, mass of proton = 1.007276 u and mass of neutron = 1.008665 u) 23??+?→211?+01?