Question

$\gamma$-rays are detected by

• A. point contact diodes
• B. thermopiles
• C. ionization chamber
• D. photocells
• E. bolometers

Hint:

High-energy radiation → detected via ionization methods.

Answer 1

The Correct Option is C

Concept: Detection of $\gamma$-rays
$\gamma$-rays are:
• High-energy electromagnetic radiation
• Highly penetrating
• Electrically neutral ---

Step 1: Detection principle
Since $\gamma$-rays are neutral:
• They do NOT directly produce current
• They ionize gases indirectly ---

Step 2: Ionization chamber

• Filled with gas
• $\gamma$-rays ionize gas molecules
• Produces charged particles → measurable current ---

Step 3: Why others are incorrect
• Diodes → detect electrical signals
• Thermopiles → measure heat
• Photocells → detect visible/UV light
• Bolometers → measure radiation via heating (less specific) --- Physical Insight:
• $\gamma$-rays are detected indirectly through ionization
• Ionization chambers are most suitable for high-energy radiation --- Final Answer: \[ \boxed{\text{Ionization chamber}} \]