A gamma-emitting isotope historically used in industrial radiography and level measurement, offering a relatively long half-life and stable output characteristics.

Cs-137 provides a mono-energetic gamma line commonly used in industrial measurement and some radiography applications. Its long half-life makes it suitable for fixed systems where consistent output over many years is beneficial, with appropriate shielding design.

• Fixed gauge and level measurement systems
• Specialized industrial radiography setups
• Long-term monitoring and process control

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Pilot sources (20–100 mCi) for crawlers.
• Half-life ~30 years
• Mono-energetic gamma emission for stable response
• Requires robust shielding design
• Used more in fixed/measurement systems than portable field radiography

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