Pennsylvania Code
Title 25 - ENVIRONMENTAL PROTECTION
Part I - Department of Environmental Protection
Subpart D - Environmental Health and Safety
Article V - Radiological Health
Chapter 227a - RADIATION SAFETY REQUIREMENTS FOR NON-HEALING ARTS RADIATION-PRODUCING DEVICES
Subchapter B - GENERAL TECHNICAL REQUIREMENTS
Section 227a.11 - Warning devices

(a) Label. Warning devices must be labeled so that their purpose is easily identified.

(b) Warning device light. An easily visible warning device light labeled with the words "X-RAY ON," or words having a similar intent, must be located near every switch that energizes an X-ray tube and must be illuminated only when the tube is energized. This warning light must be of a fail-safe design.