5) Cesium 137 is a radioactive element that was released into the Atmosphere during the Chernobyl Nuclear Power Plant accident in 1986. The half-life of Cesium 137 is 30 years. If 27 kg. were released into the Atmosphere in 1986, then how much will remain in 2030.

The half life for the radioactive decay of rubidium-87 to strontium-87 is 4.88 × 10¹⁰ years. Suppose nuclear chemical analysis shows that there is 0.423 mmol of strontium-87 for every 1.000 mmol of rubidium-87 in a certain sample of rock. Calculate the age of the rock. Round your answer to 2 significant digits. years x10

Phosphorus-32 is a commonly used radioactive nuclide in biochemical research, particularly in studies of nucleic acids. The half-life of phosphorus-32 is 14.3 days. What mass of phosphorus-32, in milligrams, is left from an original sample of 175 mg of Na₃³²PO₄ after 41.5 days? Assume that the atomic mass of ³²P is 32.0

Chromium-51 is a radioisotope that is used to assess the lifetime of red blood cells The half-life of chromium-51 is 27.7 days. If you begin with 54.7 milligrams of chromium-51, how many milligrams will you have left after 111 days have passed? mg

Strontium-90 (90Sr) is a radioactive isotope with a half-life of 28.8 years. What percentage of this isotope remains after 18.6 years?

The half life for the radioactive decay of carbon-14 to nitrogen-14 is 5.73 × 10³ Suppose nuclear chemical analysis shows that there is 0.790 mmol of nitrogen-14 for every 1.000 mmol of carbon-14 in a certain sample of rock. Calculate the age of the rock. Round your answer to 2 significant digits. years x10 years. X

Strontium-90, a beta emitter, has a half-life of 28.1 years. a. Write the balanced nuclear equation for the beta decay of Strontium-90. Write the atomic symbols as shown in the following example: Calcium-41 should be written as 41/20 Ca b. How many years are required for 62 mg of Strontium-90 to decay to 16 mg of Strontium-907 A Moving to another question will save this response. M B

Iodine-131 is used in the diagnosis and treatment of thyroid disease and has a half-life of 8.0 days. If a patient with thyroid disease consumes a sample of Na 131 I containing 10. μ g 131 I, how long will it take for the amount of 131 I to decrease to 1/100 of the original amount?

Exposure to radioactive material is considered safe after 10 half-lives because

Strontium−90 is one of the products of the fission of uranium−235. This strontium isotope is radioactive, with a half-life of 28.1 years. Calculate how long (in years) it will take for 1.42 g of the isotope to be reduced to 0.833 g by decay.