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Edexcel | Physics WPH0 | S 11 5 1 | 1 hour 30 minutes

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Polonium-210 is an alpha-emitter with a half-life of 138 days. It emits alpha particles of energy 5.3 MeV as it decays to a stable isotope of lead.

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(a) (I)

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3 Mark s

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(a) (II)

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3 Mark s

Hence show that the rate of energy release by the pellet is more than 60 W.

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(b)

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The radius of the pellet is 2.25 mm and its equilibrium temperature would be about

1000 K.

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(b) (I)

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3 Mark s

Assuming that 5% of the energy released is radiated away, show that this

approximate value of temperature is correct.

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(b) (II)

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2 Mark s

Calculate the wavelength at which peak energy radiation occurs.

Wavelength of peak energy radiation = ...................................

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(b) (III)

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1 Mark

State the region of the electromagnetic spectrum in which this wavelength of

radiation would be found.

Infrared

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(c)

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2 Mark s

Explain why very small quantities of polonium-210 are a health hazard only if taken

into the body.

Alphas are highly ionising

(therefore) will not penetrate the skin (and enter the body)

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