Posted: June 23rd, 2016

Gamma rays are also ionising rays used to produce medical images for diagnostic purposes. Critically compare the use of x-rays and gamma camera images for medical diagnosis.

5. Gamma rays are also ionising rays used to produce medical images for diagnostic purposes. Critically compare the use of x-rays and gamma camera images for medical diagnosis. (2.2)

6. Describe how ionising radiation and radio nuclides can be used therapeutically e.g. to treat cancer. (2.3)

7. Suppose you are standing 2 metres away from a source of x-rays, and then you move to a position 4 metres away. By how much will the intensity of the x-rays have fallen. What is the name of the Law that applies to the intensity of radiation with respect to distance? (2.4)

8a. Describe Alpha, Beta and Gamma decay.

b. A patient has been administered Iodine131 to check for cancerous changes to the thyroid gland. Explain the safety precautions needed as this tracer progresses through the body. (2.5)

9. Critically compare the use of ultrasound to produce and image of a foetus suitable for diagnostic use; and x-rays to produce an image for the same purpose. (3.1)

10. What are the safety precautions that need to be taken when using ultrasound for medical use? (3.2)

11. Discuss the medical use of Cardiac Ultrasound in stroke diagnosis. (4.1)