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Radioactivity and Nuclear Reactions
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How does a cloud chamber detect radiation?

A cloud chamber, a rectangular box with transparent sides containing water or ethanol vapor, can be used to detect α or β radiation.

Slide 58

How does a cloud chamber detect radiation?

How does a cloud chamber detect radiation?

A cloud chamber, a rectangular box with transparent sides containing water or ethanol vapor, can be used to detect α or β radiation.

A radioactive sample placed in the cloud chamber emits charged α or β particles which pull electrons off atoms in the air leaving a trail of ions.

Slide 59

How does a cloud chamber detect radiation?

How does a cloud chamber detect radiation?

Vapor condenses around these ions forming small drops along their path.

Beta leave long, thin trails

Alpha leave shorter, thicker trails

Slide 60

What is a bubble chamber?

What is a bubble chamber?

A bubble chamber contains superheated liquid under high pressure so that it does not boil.

Slide 61

What is a bubble chamber?

What is a bubble chamber?

A bubble chamber contains superheated liquid under high pressure so that it does not boil.

When a radioactive particle passes through, it leaves a trail of ions that causes the liquid to boil along the ion trail.

Slide 62

Bubble Chamber

Bubble Chamber

When a charged particle passes through superheated liquid, it leaves a trail of tiny gas bubbles that can be illuminated & photographed. The track of a charged particle can be used to identify the particle & to analyze complex events.

Slide 63

How does an electroscope detect radiation?

How does an electroscope detect radiation?

Nuclear radiation can cause an electroscope to lose its charge.

Slide 64

How does an electroscope detect radiation?

How does an electroscope detect radiation?

Nuclear radiation can cause an electroscope to lose its charge.

Leaves stay apart until their extra negative charges can combine with positive charges creating positive ions in the air.

Slide 65

Tevatron Accelerator

Tevatron Accelerator

Slide 66

Measuring Radiation

Measuring Radiation

A Geiger counter has a negatively charged Cu tube with a positively charged wire running through it.

Slide 67

Measuring Radiation

Measuring Radiation

The tube is filled with gas at low pressure.

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