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Question 30

Iodine-131 is a radioactive isotope that emits beta-minus particles.

The equation for this decay is

^{131}_{53}\text{I} \rightarrow ^{A}_{Z}\text{Xe} + ^{0}_{-1}\text{e}

(i) The atomic (proton) number for iodine-131 is

A 0
B 53
C 78
D 131

[1]

(ii) The mass (nucleon) number, $A$ , for $Xe\text{Xe}$ is

A -1
B 0
C 53
D 131

[1]

Iodine-131 is used in the treatment of thyroid cancer. Patients swallow a capsule containing the isotope, which is then absorbed and concentrated selectively by the thyroid gland.

Explain why iodine-131 is suitable for this treatment.

[2]

Markscheme

Radioactivity and particles Questions

IGCSE
Physics
Radioactivity and particles

Radioactivity and particles

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Radioactivity and particles

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Question 30

Iodine-131 is a radioactive isotope that emits beta-minus particles.

The equation for this decay is

^{131}_{53}\text{I} \rightarrow ^{A}_{Z}\text{Xe} + ^{0}_{-1}\text{e}

(i) The atomic (proton) number for iodine-131 is

A 0
B 53
C 78
D 131

[1]

(ii) The mass (nucleon) number, $A$ , for $Xe\text{Xe}$ is

A -1
B 0
C 53
D 131

[1]

Iodine-131 is used in the treatment of thyroid cancer. Patients swallow a capsule containing the isotope, which is then absorbed and concentrated selectively by the thyroid gland.

Explain why iodine-131 is suitable for this treatment.

[2]

Markscheme

Radioactivity and particles Questions

IGCSE
Physics
Radioactivity and particles