Section 144-220-E-D-21 - SurveillanceA. During each radiographic operation the radiographic personnel, shall maintain continuous direct visual surveillance of the operation to protect against unauthorized entry into a high radiation area, as defined in Part A.2.A, except at permanent radiographic installations where all entryways are locked and the requirements of E.12 are met.B. Radiographic exposure devices shall not be left unattended except when in storage or physically secured against unauthorized removal or tampering.10-144 C.M.R. ch. 220, § E-D-21