Half Life and Radioactivity

What form of radiation should a medical tracer emit?

• alpha

• beta

• gamma

• any of these

The % of the parent isotope remaining after 3 Half Lives.

• 50%

• 25%

• 12.5%

• 6.25%

Tags

NGSS.HS-PS1-8

_______________ is the process by which unstable atoms emit radiation until they become stable.

• Radiation

• Chemical Reaction

• Radioactive Decay

• Isotopes

Tags

NGSS.HS-PS1-8

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.

• 25mg

• 25g

• 10g

• 10mg

Tags

NGSS.HS-PS1-8

The half-life of strontium-90 is 25 years. How much strontium-90 will remain after 100 years if the initial amount is 4.0 g?

• 3.0g

• 0.25mg

• 0.3g

• 0.25g

Tags

NGSS.HS-PS1-8

Finish this equation

²⁰⁹₈₃Bi--> _{_______ +} ²⁰⁵₈₁Tl

• ⁴₂He

• ⁰_-1e

• y

Tags

NGSS.HS-PS1-8

Solve this equation for alpha decay.
₈₅²⁰⁹At = ___ + ₂⁴He

• ₈₃²⁰⁵Bi

• ₈₆²⁰⁹Rn

• ₈₁²⁰⁷Tl

• ₈₅²⁰⁸At

Tags

NGSS.HS-PS1-8

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

• 50%

• 25%

• 12.5%

• 6.25%

Tags

NGSS.HS-PS1-8

A sample will lose half of the parent isotope after 1 half life.

• TRUE

• FALSE

Tags

NGSS.HS-PS1-8

The diagram shows 32 atoms

32 of the Red are the parent isotope

0 of the atoms are daughter isotopes

How many half-lives have occurred?

• 0

• 1

• 2

• 3

Tags

NGSS.HS-PS1-8