Unit B624/02 - OCR

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12 Gamma rays and X-rays are used to treat cancer. (a) Gamma rays come from the nucleus of some radioactive materials. How are X-rays made? __________________________________________ ________________________________________ [1] (b) (i) X-rays are often better than gamma rays for cancer treatment. Suggest why. _______________________________________ _____________________________________ [1] 30
(ii) An X-ray gun is rotated around a cancer patient’s head. tumour X-ray gun moves around in a circle patient’s head The X-rays are always aimed at the tumour. This kills the cancer cells from all directions. Give ONE OTHER reason why the X-ray gun is moved around the cancer patient’s head. _______________________________________ _____________________________________ [1] [Total: 3] 31
Page 1 and 2: Candidate Forename Centre Number Ca
Page 3 and 4: EQUATIONS speed = distance time tak
Page 5 and 6: Answer ALL the questions. SECTION A
Page 7 and 8: (c) The scientist says that the pla
Page 9 and 10: (b) Tomato plants are often grown i
Page 11 and 12: 3 Plants need minerals to grow. The
Page 13 and 14: (iii) Most plant leaves are NOT ada
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Page 17 and 18: (b) The overuse of fertilisers some
Page 19 and 20: (c) Another way of cleaning clothes
Page 21 and 22: lakes and reservoirs sedimentation
Page 23 and 24: 8 This question is about acids and
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Page 27 and 28: (c) Static electricity can also be
Page 29: 11 ULTRASOUND scans are used in hos
Page 33 and 34: (c) Background radiation is always
Page 35 and 36: Copyright Information OCR is commit

Unit B624/02 - OCR

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