Worksheet: Measures of Radioactivity

In this worksheet, we will practice defining the becquerel, curie, gray, and sievert as units of decay activity, cell irradiation, and radiation dose.

Q1:

A sample of thorium-229 has a mass of 2.234 g. The half-life of this radioisotope is 7,340 years.

What is the activity of the sample in becquerels, to 3 significant figures?

  • A1.76×10 Bq
  • B4.03×10 Bq
  • C7.63×10 Bq
  • D1.05×10 Bq
  • E4.22×10 Bq

What is the activity of the sample in curies, to 3 significant figures?

Q2:

A sample of cobalt-60 has a mass of 5.000 g. The half-life of this radioisotope is 5.26 years.

What is the activity of the sample in becquerels?

  • A9.10×10 Bq
  • B3.02×10 Bq
  • C2.10×10 Bq
  • D4.19×10 Bq
  • E2.51×10 Bq

What is the activity of the sample in curies?

  • A2.46×10 Ci
  • B1.13×10 Ci
  • C1.25×10 Ci
  • D6.80×10 Ci
  • E5.66×10 Ci

Q3:

A sample of tritium (hydrogen-3) has a mass of 1.000 mg. The half-life of this radioisotope is 12.32 years.

What is the activity of the sample in becquerels, to 3 significant figures?

  • A1.18×10 Bq
  • B9.40×10 Bq
  • C3.58×10 Bq
  • D3.92×10 Bq
  • E1.57×10 Bq

What is the activity of the sample in curies, to 3 significant figures?

Nagwa uses cookies to ensure you get the best experience on our website. Learn more about our Privacy Policy.