Americium-241 is widely used in smoke detectors. Calculate the amount of americium-241 consumed in a smoke detector (initially containing 3.20 µg of Am), in micrograms, that has been used for one year if the half-life is 433 years.

The half-life of plutonium-239 is 24,100 years. How long will it take for a 100 g sample of plutonium to be reduced to 25 g?

Americium-241 is widely used in smoke detectors. Calculate the amount of americium-241 consumed in a smoke detector (initially containing 6.70 µg of Am), in micrograms, that has been used for one year if the half-life is 433 years.

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 54.8 mg of this isotope, what mass remains after 59.3 days have passed? Since the decomposition is a radioactive decay reaction, it is first order. mg

Americium-241 is widely used in smoke detectors. Calculate the amount of americium-241 consumed in a smoke detector (initially containing 3.40 µg of Am), in micrograms, that has been used for one year if the half-life is 433 years.

cl4 undergoes first order radioactive decay. For simplicity let its half-life be 6,000 years. The disintegration rate, measured as counts/sec by a radiation detector, is proportional to the amount of C1ª remaining. Suppose a sample which originally showed 8,000 counts/sec now shows 1000 counts/sec. What is the age of the sample? Note that you can't put a comma in your answer. years

In living organisms, C-14 atoms disintegrate at a rate of 15.3 atoms per minute per gram of carbon. The half-life of C-14 is 5730 years. A charcoal sample from an archaeological site has a C-14 disintegration rate of 7.5 atoms per minute per gram of carbon. Estimate the age of this sample in years. Please report an integer.

The half life for the radioactive decay of rubidium-87 to strontium-87 is 4.88 × 100 years. Suppose nuclear chemical analysis shows that there is 0.455 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. O years x10

Nitrogen-13 is used in tracers injected into the bloodstream for positron emission tomography (PET). What is the half-life of nitrogen-13 if 40.8 minutes are required for the activity of a sample of nitrogen-13 to fall to 5.92 percent of its original value? mins

If a smoke detector was manufactured with 330 nanograms of americium oxide, what percent of it is left after 96 years? Round your answer to the nearest tenth.