Purchase Solution

Problems About Radioactivity and Nuclear Chemistry

Not what you're looking for?

Ask Custom Question

1. At 8:00 a.m., a patient receives a 58-mg dose of I -131 to obtain an image of her thyroid. If the nuclide has a half-life of 8 days, what mass of the nuclide remains in the patient at 5:00 p.m. the next day? (Assume no excretion of the nuclide from the body).
Express your answer using two significant figures.

2. A radioactive sample contains 1.55g of an isotope with a half-life of 3.8 days. What mass of the isotope will remain after 5.5 days? (Assume no excretion of the nuclide from the body.) Express your answer using two significant figures.

3. A particular smoke detector contains 1.45μCi of 241 Am, with a half-life of 458 years. The isotope is encased in a thin aluminum container. Calculate the mass of 241 Am in grams in the detector. Express your answer numerically in grams.

4. The following conversion factors may help you when working this problem:
Activity in becquerels (Bq ) = activity in disintegrations per second (dps).

1.00 mCi=3.70×10 7 Bq. Neutron activation analysis for a sample of a rock revealed the presence of 59 26 Fe, which has a half-life of 46.3days. Assuming the isotope was freshly separated from its decay products, what is the mass of 59 26 Fe in a sample emitting 1.00 mCi of radiation? Express your answer in grams to three significant figures.

Purchase this Solution

Solution Summary

The solution discusses the problems about radioactivity and nuclear chemistry.

Solution Preview

1. A = Ao x e^-(0.693t/t1/2) = 58 x e^-(0.693 x 33/(8 x 24)) = 51 mg

2. A = Ao x e^-(0.693t/t1/2) = ...

Purchase this Solution


Free BrainMass Quizzes
Match Elements with their Symbols

Elements are provided: choose the matching one- or two-letter symbol for each element.

General Chemistry - Classification of Matter

This test will assess your knowledge on the classification of matter which includes elements, compounds and mixtures.

Thermochemistry

The quiz helps in revising basic concepts about thermochemistry.

Organic Chemistry Naming: Alkanes

This is a quiz which is designed to assist students with learning the nomenclature used to identify organic compounds. This quiz focuses on the organic compounds called Alkanes.