Which type of instrument is primarily used to measure x-ray output?

The type of instrument primarily used to measure x-ray output is the equipment survey device. This device is specifically designed to assess and quantify the radiation output from x-ray machines, ensuring that they operate within safe and effective parameters. Equipment survey devices can measure various characteristics of the x-ray output, such as intensity, energy, and consistency, which are essential for maintaining the quality and safety of radiological practices.

These devices often employ specialized detectors to capture the radiation emitted from an x-ray source, allowing for accurate assessment and calibration. Properly measuring x-ray output is critical in both diagnostic and therapeutic settings, as it ensures that patients and personnel are protected from excessive radiation exposure while still achieving the desired imaging or treatment results.

In contrast, other options serve different functions. Environmental survey devices focus on measuring ambient radiation levels, detection meters are generally used for detecting presence rather than quantifying output, and grid calibration units are specialized for calibrating grid systems in radiography but do not measure x-ray output directly.