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Edexcel | Physics WPH0 | S 10 5 1 | 1 hour 30 minutes

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14

Ionisation smoke detectors contain a small amount of the radioactive isotope americium.

14

(a)

1 Mark

Explain why the radiation produced by a smoke detector does not pose a health

hazard.

Alpha-radiation only has a range of a few cm in air / cannot penetrate

walls of container / skin

14

(b) (I)

2 Mark s

Complete the nuclear equation for the decay of americium.

14

(b) (II)

3 Mark s

Using data from the table, calculate the energy, in MeV, of α-particles released

when a nucleus of americium-241 undergoes alpha decay.

Energy = ................................................... MeV

14

(c)

1 Mark

An ionisation smoke detector is sold with the guarantee that it “lasts a

lifetime”. Comment on the appropriateness of this guarantee, based on its use of

americium-241.

Reference to half-life and typical lifespan

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