The equivalent dose that accounts for the different biological effects of different radiations is measured in
Correct answer: B. sievert
- A. gray
- B. sievert
- C. becquerel
- D. joule
Explanation
The sievert multiplies the absorbed dose in grays by a quality factor, which is 1 for beta and gamma but about 20 for alpha particles, because alpha deposits its energy in a very short track and does far more local damage. Legal exposure limits for workers and the public are therefore set in millisieverts. The becquerel describes the source rather than the dose received.
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About Biological and Medical Uses of Radiation
Radiation in medicine includes X-rays and gamma rays for imaging, radioactive tracers for diagnosis, and controlled radiation for destroying cancerous tissue. The topic also covers CT scans, PET imaging, radiotherapy, sterilisation, half-life and dosage, alongside biological damage, shielding and the need to balance diagnostic or therapeutic benefit against exposure.
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