Physics Nuclear Physics UHS 2023
PMDC Verified Question 17 of 98
The SI unit of equivalent dose is:
A
Gray
B
Mass
C
Rad
D
Sievert
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: Sievert


Concept:

Understanding the distinction between physical dose and biological effect.

Solution:

  • Gray (Gy) measures the absolute physical energy absorbed per kg of tissue (Absorbed Dose).


  • Sievert (Sv) measures the Equivalent Dose, which factors in the biological damage caused by different types of radiation (e.g., Alpha is far more damaging per Gray than Gamma).


  • Therefore, the strictly defined SI unit for Equivalent Dose is the Sievert.


Why other options are incorrect:

Gray is absorbed dose. Rad is an old, non-SI unit for absorbed dose. Mass is a fundamental property, not a radiation unit.

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