Radiation Flashcards

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1
Q

What three types of radiation are there?

A

Alpha, beta and gamma

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2
Q

Where does radiation come from?

A

Unstable nuclei

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3
Q

List the types of radiation in order of increasing penetration ability

A
  1. Alpha-sheet of paper
  2. Beta-3mm aluminium
  3. Gamma-3m concrete
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4
Q

What is an alpha particle?

A

Effectively a helium nucleus-2 photos and 2 neutrons +2 charge

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5
Q

What is a beta particle?

A

An electron -1 charge

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6
Q

What is a gamma ray?

A

An electromagnetic wave with no charge

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7
Q

What is the ionising ability of alpha?

A

Very strong

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8
Q

What is the ionising ability of beta?

A

Moderate

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9
Q

What is the ionising ability of gamma?

A

Weak

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10
Q

What is ionisation?

A

The process of removing an electron from an atom atom

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11
Q

How do use a magnetic field to separate radiation

A

A magnetic field causes a moving charged particle to be deflected. The direction depends on the charge

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12
Q

How do you use an electric field to separate radiation?

A

Pass it through two electrodes. The particles will move towards the opposite electrode

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13
Q

What is an ionic half life?

A

The time taken for half of the atoms to decay

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14
Q

What problems does radiation cause?

A
  1. Mutations
  2. Damage to cells and tissue
  3. Disposal of waste
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15
Q

What was the Geiger-matsden experiment?

A
  1. They fired alpha particles at gold leaf

2. Most went straight through. Some were deflected. Some bounced back

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16
Q

What was Rutherford’s atom like?

A

That the atom was mostly empty space with the tiny nucleus in the middle as opposed to spread out

17
Q

What happens in nuclear fission?

A
  1. Uranium 235 breaks apart when it is struck by a low-charge neutron
  2. Releases KE as gamma rays and decay fragments
  3. The parent nucleus(235) froduces two daughter nuclei.
  4. If these are absorbed by other fissile nuclei then a chain reaction ensues.
18
Q

What does the moderator do in nuclear fission?

A

Absorb some of the energy of fast neutrons so they are absorbed easily to sustain the chain reaction

19
Q

What do the control rods do in nuclear fission?

A

Absorb neutrons to eliminate them. Can be raised to speed up the reaction or lowered to shut down the reaction