Physics Nuclear Physics UHS 2023
PMDC Verified Question 19 of 98
The relation between gray and rad is given as: \( 1 \text{ Gy} = \_\_\_\_ \text{ rad} \)
A
0.01
B
0.001
C
10
D
100
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option D: 100


Concept:

Both Gray (SI unit) and rad (historical unit) measure absorbed radiation dose.

Solution:

  • By definition, 1 rad is equal to the absorption of 0.01 Joules of energy per kilogram of tissue.


  • 1 Gray is defined as 1 Joule per kilogram.


  • Therefore, it requires exactly 100 rads to equal 1 Gray. \( (1\text{ Gy} = 100\text{ rad}) \).


Why other options are incorrect:

Option A implies 1 rad = 100 Gy, reversing the conversion factor. Options B and C are off by orders of magnitude.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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