Ionization smoke alarms are devices designed to detect smoke and fire. They use a small amount of radioactive material to create an electric current between two electrodes. When smoke enters the chamber, it disrupts this current, triggering the alarm to sound. These alarms are particularly effective at detecting fast-flaming fires, such as those caused by paper or wood. These alarms are typically less expensive than other types, like photoelectric smoke alarms. However, they may not respond as quickly to smoldering fires, which produce more smoke before bursting into flames. Regular maintenance, including battery replacement, is essential for optimal performance.