Which detector sounds an alarm to indicate the presence of radioactivity?

Which detector sounds an alarm to indicate the presence of radioactivity?

• A. Geiger-Mueller detector
• B. Film badge
• C. Pocket ionization chamber
• D. TLD

Answer: (A)

Geiger-Mueller detectors are built to detect ionizing radiation in real time and often include audible indicators. When radiation enters the Geiger-Mueller tube, it ionizes the gas and produces pulses that are converted into sounds or alarms, giving an immediate signal that radioactivity is present. This real-time alerting makes them the best fit for indicating radiation with an audible alarm. In contrast, a film badge records exposure over time and is read later, so it doesn’t emit an alarm. A pocket ionization chamber measures the current from ionization for an instantaneous exposure rate but typically doesn’t produce a sound alarm unless tied to an external system. A thermoluminescent dosimeter stores energy and is also read later, with no real-time audible indication.

Geiger-Mueller detectors are built to detect ionizing radiation in real time and often include audible indicators. When radiation enters the Geiger-Mueller tube, it ionizes the gas and produces pulses that are converted into sounds or alarms, giving an immediate signal that radioactivity is present. This real-time alerting makes them the best fit for indicating radiation with an audible alarm. In contrast, a film badge records exposure over time and is read later, so it doesn’t emit an alarm. A pocket ionization chamber measures the current from ionization for an instantaneous exposure rate but typically doesn’t produce a sound alarm unless tied to an external system. A thermoluminescent dosimeter stores energy and is also read later, with no real-time audible indication.