What is the variability allowed for timer accuracy when it is longer than 10ms?

The variability allowed for timer accuracy when the duration exceeds 10 milliseconds is established by regulatory standards, which generally denote a tolerance of +/- 5%. This specification ensures that timing mechanisms are highly precise, particularly for equipment used in medical settings where exact timing can significantly impact patient safety and the effectiveness of procedures.

Maintaining such a narrow margin of error is crucial because even minor inaccuracies in timing can lead to significant changes in dosage or exposure levels in radiographic procedures. Therefore, the +/- 5% tolerance is set to guarantee operational integrity and patient safety within the realm of radiologic technology.

The options reflecting higher tolerances, such as +/- 10%, 15%, or 20%, do not meet the safety and operational standards that are critical in medical imaging and therapeutic applications, making them less suitable choices in this context.