The most abundant radon isotope is radon-222, which is an alpha emitter with a half-life of...

   

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The most abundant radon isotope is radon-222, which is an alpha emitter with a half-life of 3.8 days. The air in a house basement in Canada is found to have a radon level of 500 Bq m³. The World Health Organization's safe limit for radon is 100 Bq m³. How long will it take for the radon level to decay to 100 Bq m³ in a sample of air from this basement? An archaeologist uncovers a wooden object at an archaeological site. The object is found to have a carbon-14 decay rate of 0.11 disintegrations per second per gram of carbon. How old is the object? (Living organisms have a decay rate of 0.255 s¹ g¹, and t₁/2 = 5730 y for C-14.) Thorium-232 has a radioactive decay series that ultimately produces lead-208. What is the expected ratio of 202Pb/232Th in a meteorite that is approximately 3.0 × 109 years old? (The half-life of thorium-232 is 1.4 x 1010 y.) For each of the following carbon isotopes, calculate the mass defect and nuclear binding energy. Isotope 12C Isotope mass (u) 12.000000000 13C 13.003354838 6 14C 14.003241991 The most abundant radon isotope is radon-222, which is an alpha emitter with a half-life of 3.8 days. The air in a house basement in Canada is found to have a radon level of 500 Bq m³. The World Health Organization's safe limit for radon is 100 Bq m³. How long will it take for the radon level to decay to 100 Bq m³ in a sample of air from this basement? An archaeologist uncovers a wooden object at an archaeological site. The object is found to have a carbon-14 decay rate of 0.11 disintegrations per second per gram of carbon. How old is the object? (Living organisms have a decay rate of 0.255 s¹ g¹, and t₁/2 = 5730 y for C-14.) Thorium-232 has a radioactive decay series that ultimately produces lead-208. What is the expected ratio of 202Pb/232Th in a meteorite that is approximately 3.0 × 109 years old? (The half-life of thorium-232 is 1.4 x 1010 y.) For each of the following carbon isotopes, calculate the mass defect and nuclear binding energy. Isotope 12C Isotope mass (u) 12.000000000 13C 13.003354838 6 14C 14.003241991