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Chapter: 17 / Q: 25
Which one of the following beams is the most penetrating?
Chapter: 17 / Q: 26
Exposing a foetus or young baby to x-rays should be avoided. What is the cause of the danger most likely to be due to?
Chapter: 17.2 / Q: 1
Which of the following statements about radioactivity is NOT correct?
Chapter: 17.2 / Q: 2
If a patient who has been administered a radiopharmaceutical containing technetium 99m (halflife = 6 hours), is allowed to go home 36 hours after the administration, what fraction of the original radioactivity is left in the patient (ignoring excretion from the body)?
Chapter: 17.2 / Q: 3
In radiotherapy, why is the patient’s irradiation treatment “fractionated”, that is, consist of (say) 20 sessions and spread over (say) 4 weeks – rather than given all at 1 session?
Chapter: 17.2 / Q: 4
Which of the following statements about radioactivity is correct?
Chapter: 17.2 / Q: 5
Given that a radiopharmaceutical containing the radionuclide technetium 99m (4399mTc) has an activity of 4 MBq immediately prior to injection into a patient. About 12 hours later the patient is measured to have an activity of about 1 MBq. How long is the half-life of technetium 99m?
Chapter: 17.2 / Q: 6
Why are radioisotopes that emit low energy (100–250 keV) gamma rays preferred for the diagnostic procedures of nuclear medicine? Because:
Chapter: 17.2 / Q: 7
Given the statement: “Your exposure to radiation varies inversely with the square of your distance from the source of radiation”, what is the correct way to finish the sentence? “If you increased the distance between you and a patient with a radioactive implant:
Chapter: 17.2 / Q: 8
Why is radiotherapy using high energy x-rays, an effective way of treating some cancer? Because
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