Physics Nuclear Physics NUMS 2024
PMDC Verified Question 10 of 98
1 rad is equal to:
A
\( 0.01 \text{ J/Kg} \)
B
\( 0.01 \text{ Kg/J} \)
C
\( 0.01 \text{ J} \)
D
\( 0.01 \text{ Kg} \)
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: \( 0.01 \text{ J/Kg} \)


Concept:

The "rad" (radiation absorbed dose) is a legacy unit used to measure the physical dose of ionizing radiation absorbed by tissue.

Formula:

$$ 1\text{ Gy} = 1\text{ J/kg} = 100\text{ rad} $$

Solution:

  • Because 100 rads equal exactly 1 Joule per Kilogram (1 Gray), we simply divide by 100.


  • $$ 1\text{ rad} = \frac{1}{100}\text{ J/kg} = 0.01\text{ J/kg} $$


  • This means 1 rad represents the absorption of a tiny amount of energy (0.01 Joules) per kilogram of flesh.


Why other options are incorrect:

Option B flips the units upside down. Options C and D only include single dimensions (energy or mass) instead of a ratio, invalidating them as measurements of absorbed dose.

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