Question

(9 marks) Question 5 (a) Technetium-99 is used in medicine to produce an image of a person's brain. The isotope is injected into the patient, and the sensor detecting the radiation it produces is outside the body. i) Which sort of ionising radiation does technetium-99 produce? (1) ii) Explain why only this sort of ionising radiation is appropriate in this context. (3) iii What sort of half-life would you expect technetium-99 to have? Explain your answer. (3) (b) Sources emitting alpha radiation are used in a variety of contexts, including in smoke alarms and some treatments for cancer ) In a smoke alarm, the alpha source is posi sensor. When smoke reaches the alarm, the sensor detects

Answer 1

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