Energy radiation absorbed at the rate of one joule per kilogram is called:
Correct answer: D. 1 Gray
- A. 1 Rad
- B. 1 Sievert
- C. 1 Yellow
- D. 1 Gray
Explanation
1 Gray is the unit of absorbed radiation equal to the dose of one joule of energy absorbed per kilogram of matter, or 100 rad. The unit is named for the British physician L. Harold Gray (1905-1965), an authority on the use of radiation in the treatment of cancer.
This question appeared on the UHS MDCAT 2016 paper, which you can sit online with every answer explained.
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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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