Section 120.239 - Exceptions to Posting Requirements(A) A licensee or registrant is not required to post caution signs in areas or rooms containing radioactive materials for periods of less than eight hours, if each of the following conditions is met: (1) the radioactive materials are constantly attended during these periods by an individual who takes the precautions necessary to prevent the exposure of individuals to radioactive materials in excess of the limits established in 105 CMR 120.200; and,(2) the area or room is subject to the licensee's or registrant's control.(B) Rooms or other areas in hospitals that are occupied by patients are not required to be posted with caution signs pursuant to 105 CMR 120.242 provided that patient could be released from confinement pursuant to 105 CMR 120.540.(C) Rooms or other areas in hospitals that are occupied by patients are not required to be posted with caution signs, provided that:(1) A patient being treated with a permanent implant could be released from confinement pursuant 105 CMR 120.540; or(2) A patient being treated with a therapeutic radiopharmaceutical could be released from confinement pursuant 105 CMR 120.540.(D) A room or area is not required to be posted with a caution sign because of the presence of a sealed source provided the radiation level at 30 centimeters from the surface of the sealed source container or housing does not exceed 0.05 mSv (0.005 rem) per hour.(E) A room or area is not required to be posted with a caution sign because of the presence of radiation machines used solely for diagnosis in the healing arts.(F) Rooms in hospitals or clinics that are used for teletherapy are exempt from the requirement to post caution signs under 105 CMR 120.238 if: (1) Access to the room is controlled pursuant to 105 CMR 120.573; and,(2) Personnel in attendance take necessary precautions to prevent the inadvertent exposure of workers, other patients, and members of the public to radiation in excess of the limits established in 105 CMR 120.200.Amended by Mass Register Issue 1373, eff. 9/7/2018.