What is the acceptable accuracy of readings for survey meters calibrated at one-third and two-thirds scale?

The acceptable accuracy of readings for survey meters calibrated at one-third and two-thirds scale is 20%. This level of accuracy is deemed appropriate because it reflects the operational tolerances of these devices when they are used in the field. Survey meters are crucial for measuring radiation levels accurately to ensure safety in various environmental and industrial settings.

Calibration is essential to ensure the instruments can give reliable readings over the range of their design; thus, an accuracy specification of 20% is intended to accommodate normal variations in measurement, ensuring that users can still rely on the information conveyed by the meters. This standard helps maintain the safety protocols necessary for effective radiation protection practices.