radioactivity_questions.pdf

7/25/2019 Radioactivity_Questions.pdf

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Core 1

page 1Atomic Physics


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page 2

Core 2

Atomic Physics


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Core 3

Atomic Physics page 3

Fig. 1

Fig. 1


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Core 3



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Extension 1

page 5

2

2

Atomic Physics


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page 6

Extension 1

Atomic Physics


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33

Extension 2

3

3



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page 8

4

4

Extension 2

Atomic Physics

4


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Extension 3



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page 10

Extension 3

Atomic Physics


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Core 1

a to avoid contamination

b to prevent radiation getting out

c to warn of the presence of radioactive material


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Core 2

a(i) 84 or bottom one

(ii) 210 or top one

(iii) 84 or bottom one

(iv) 210 84 or take bottom from top or take proton number from nucleon number

b 20682


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Core 3

a(i) 320

(ii) plot must be to within +/- small square

b(i) 160

(iii) plot must be to within +/- small square

c points plotted at (60, 80) and (80, 40) +/- small square

d smooth curve through points by eye

e either of last two boxes ticked

f randomness or background


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Extension 1

a 228Th 4He + 224Ra90 2 88

b(i) must be because and are absorbed by aluminium

(ii) or or

c(i) atoms of gas gain or lose electrons by colliding with particles

(ii) any three fromthey are photons not particlesthey have no massthey have no chargethey do not have enough energy


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Extension 2

a AX 0 e + A YZ -1 Z+1

b(i) some beta absorbed by paperthicker paper, less pass through / lower reading

(ii) no gamma would be absorbed by the papergamma are less safe

c diagram should show a smooth curvetowards the bottom of the page


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Extension 3

a the diagram should show the radioactive liquid on pipe, weld and detector incorrect placeswhere the weld is thin the reading risesradiation passes more easily through / is less absorbed by thinner metal

b(i) alpha none passes through steelbeta some passes through steelgamma most / all passes through steel

(ii) either beta or gamma with a clear reason (alpha absorbed completely)

c general shielding / absorbingdistancemonitoring radiation received

radioactivity_questions.pdf

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