Radiation: Nuclear Decay and Half-life

The process of nuclear change in an atom of radioactive material is called...

• nuclear decay

• nuclear mass

• isotopes

• half-life

The three main types of nuclear radiation are alpha, beta, and gamma. Which of the following lists these types of radiation from highest penetrating power to lowest penetrating power?

• alpha, gamma, beta

• beta, alpha, gamma

• beta, gamma, alpha

• gamma, beta, alpha

Which type of nuclear radiation is being emitted here?

• alpha
• beta
• gamma
• none

If Gadolinium-150 goes through alpha decay, the resulting element has a new mass number of _____.

• 150
• 148
• 146

What element is the produced when Ag-115 undergoes beta decay?

• Ag-115

• Cd-115

• Pd-115

• Not Listed

₈₈²²⁶Ra undergoes alpha decay. What isotope is produced?

• ₈₆²²²Rn

• ₈₉²²⁶Ac

• ₈₄²²⁴Po

• ₈₈²²⁵Ra

If 10 mg of iodine-131 is given to a patient, how much is left after 24 days? The half-life of iodine-131 is 8 days.

• 8 mg

• 1.25 mg

• 2.5 mg

• 5 mg

If the half-life of uranium-232 is 70 years, how many half-lives will it take for 10 g of it to be reduced to 1.25 g?

• 1 half-life
• 2 half-lives
• 3 half-lives
• 4 half-lives

What is the half-life of this isotope?

• 32 days
• 8 days
• 16 days
• 24 days

The % of the parent isotope remaining after 1 Half Life.

• 50%

• 25%

• 12.5%

• 6.25%