x-rays can be used to treat cancer

Question 1

x-rays cause

Answer 1

ionsiation

Question 2

high doses of x-rays will

Answer 2

kill living cells

Question 3

x-rays have to be carefully

Answer 3

focused and at just the right dosage to kill cancer cells

WITHOUT DAMAGING NORMAL CELLS

Question 4

to treat cancer

Answer 4

1) using a wide beam..x-rays focused on tumour
2) beam is rotated round the patient with tumour at centre
3) this minimises exposure of normal cells to radiation