26.4 The dangers of radioactivity

What is background radiation?

• The ionising radiation that is around us all the time
• The ionising radiation from naturally occurring radiation
• The ionising radiation that is from human activities

Which of the following are NOT sources of background radiation?

• Radiation from medical uses
• Radiation from rocks
• Cosmic (space) radiation
• Radiation from farming

What is radioactivity measured in?

• Joules
• Newtons
• Becquerels

What kinds of medical treatments contribute to background radiation?

• X-rays, ultrasound scans and heart disease treatments.
• X-rays, gamma ray scans and cancer treatments.
• X-rays, injections and diabetes treatment

Cosmic radiation comes from ....

• Nuclear bombs

• Nuclear Power stations

• Space

• Earth's core

• Isotopes in objects

Isotopes are always radioactive

• true

• false

Granite rock is radioactive because it ...

• releases radon gas

• releases oxygen gas

• releases uranium gas

• releases nitrogen gas

• releases hydrogen gas

Background radiation is ...

• 0% natural

• 100% natural

• 70-95% natural

• 5-20% natural

Human activities increase the amount of background radiation

• true

• false

Flying in a plane increases your exposure to cosmic radiation

• true

• false