What factor does sensitivity in a detector measure?

• A. The ability to measure intensity of radiation
• B. The range of frequencies it can detect
• C. The physical size of the detector
• D. The type of gas used in the detector

Answer: (A)

Sensitivity in a detector refers to the detector's ability to measure the intensity of radiation effectively. A highly sensitive detector can detect even small quantities of radiation and respond to slight changes in intensity. This characteristic is crucial in applications such as medical imaging, environmental monitoring, and radiation safety, where precise measurements are vital.

While other factors such as the range of frequencies a detector can process, its physical dimensions, and the type of gas utilized may influence its overall performance, these attributes do not define sensitivity. Instead, sensitivity is specifically concerned with how well the detector can respond to different levels of radiation intensity, making it the correct choice in this context.