WPH0 QR Dynamic Papers Physics al Edexcel

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

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used to treat an overactive thyroid gland. When a small dose of 131I is swallowed, it

is absorbed into the bloodstream. It is then concentrated in the thyroid gland, where it begins destroying the gland’s cells.

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(a)

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2 Mark s

Patients are advised that radiation detection devices used at airports may detect

increased radiation levels up to 3 months after the treatment. Explain how it is

β-particles can (easily) penetrate the body/skin

Since they are not very ionising OR reference to what will stop them

12

(b) (I)

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2 Mark s

atoms will have decayed after a period of 24 days?

Fraction = ............................................................

Use idea that number of unstable atoms halves every 8 days OR that

24 days represents 3 half-lives

Correct answer

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(b) (II)

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3 Mark s

is prepared exactly 24 hours before it is due to be swallowed by the patient.

Calculate the activity that the sample should have when it is prepared.

Activity = ............................................... MBq

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