Radioactivity and Nuclear Reactions

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Slide 96

Fusion on the Sun

The heat & light Earth receives comes from this process.

About 1% of the Sun’s hydrogen has been changed into energy.

Sun has enough H to continue fusion reactions for another 5 billion years.

Slide 97

Using Nuclear Reactions in Medicine

A tracer is a radioactive isotope used to find or keep track of a molecule as it moves through your body.

Slide 98

How are iodine tracers used?

If the thyroid gland in your neck is not working properly, you get sick. The radioactive isotope I-131 is used to see if the thyroid is working properly. The I-131 decays giving off gamma rays which can be detected.

Slide 99

How can cancer be treated with radioactivity?

Radiation can be used to stop some cells from growing into tumors.

Slide 100

How can cancer be treated with radioactivity?

Radiation can be used to stop some cells from growing into tumors.

Sometimes a radioactive isotope can be placed inside or near a tumor; other times, tumors can be treated from outside the body.

Slide 101

How can cancer be treated with radioactivity?

Radiation can be used to stop some cells from growing into tumors.

Sometimes a radioactive isotope can be placed inside or near a tumor; other times, tumors can be treated from outside the body.

The radiation emitted when particles decay can turn nearby atoms into ions.

Slide 102

How can cancer be treated with radioactivity?

If a source of radiation is placed near cancer cells, atoms in those cells can be ionized such as atoms in DNA or RNA which can stop the tumor from growing or even kill it.

Slide 103

How can cancer be treated with radioactivity?

If a source of radiation is placed near cancer cells, atoms in those cells can be ionized such as atoms in DNA or RNA which can stop the tumor from growing or even kill it.

Because cancer cells grow quickly, radiation affects them more than other cells. Patients receiving radiation suffer side effects when it ionizes healthy cells.

Slide 104

Fission

Both

Fusion

Complete the Venn diagram by listing one thing that fission & fusion have in common, one thing that applies only to fission, & one thing that applies only to fusion,