When is alpha radiation a concern?

• A. Normal Operation
• B. When a System Has Been Opened Up for Maintenance
• C. When a Reactor Is Powered On
• D. When the System Is Sealed

Answer: (B)

Alpha radiation is highly ionizing but has very low penetration, so it stays where the radioactive material is and is usually well contained by shielding. When a system is closed and sealed, that containment keeps alpha sources from reaching workers. The risk rises when maintenance requires opening the system, because contamination on surfaces or dust can become airborne or spread to exposed areas. In that moment, inhalation or ingestion of alpha-emitting material is possible, so controls like containment, ventilation, dust suppression, and personal protective equipment are essential.

So, the concern for alpha radiation mainly appears during maintenance when the system is opened and containment is temporarily breached. Normal operation with proper shielding and a sealed system presents far less alpha exposure risk.