Week 3 part 2 Flashcards

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1
Q

What is half-life?

A
  • The time it takes for the amount of radiation emitted to half.
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2
Q

What is half-life measured in?

A
  • Bacquerels

1 Bq is 1 decay per second

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3
Q

What is background radiation? (DON’T NEED)

A
  • Low level radiation that is around us all the time, you should always measure and subtract the background radiation from your results to avoid systematic errors.
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4
Q

What factors affect background radiation? (DON’T NEED)

A
  • Food, air, building materials, rocks, cosmic rays, nuclear explosions (man made).
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5
Q

What is irradiation?

A
  • Being exposed to radiation
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6
Q

What is contamination?

A
  • When radioactive atoms get into or onto an object
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7
Q

Which types of radiation are dangerous inside the body?

A
  • Alpha because it does most of its damage in a localised area.
  • Beta is not because the radiation is absorbed over a wider area
  • Gamma the radiation just passes through organs
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8
Q

What types of radiation are dangerous outside the body?

A
  • Beta and gamma as they can pass through the skin

- Alpha is not as dangerous as it can’t pass through skin

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