Section 120.238 - Posting Requirements(A)Posting of Radiation Areas The licensee or registrant shall post each radiation area with a conspicuous sign or signs bearing the radiation symbol and the words "CAUTION RADIATION AREA."(B)Posting of High Radiation Areas The licensee or registrant shall post each high radiation area with a conspicuous sign or signs bearing the radiation symbol and the words "CAUTION HIGH RADIATION AREA" or "DANGER HIGH RADIATION AREA."(C)Posting of Very High Radiation Areas The licensee or registrant shall post each very high radiation area with a conspicuous sign or signs bearing the radiation symbol and words "GRAVE DANGER [not required to use the word GRAVE this may be omitted] VERY HIGH RADIATION AREA."(D)Posting of Airborne Radioactivity Areas The licensee shall post each airborne radioactivity area with a conspicuous sign or signs bearing the radiation symbol and the words "CAUTION AIRBORNE RADIOACTIVITY AREA" or "DANGER AIRBORNE RADIOACTIVITY AREA."(E)Posting of Areas or Rooms in Which Licensed Material is Used or Stored The licensee hall post each area or room in which there is used or stored an amount of licensed material exceeding ten times the quantity of such material specified in 105 CMR 120 297: Appendix C with a conspicuous sign or signs bearing the radiation symbol and the words "CAUTION RADIOACTIVE MATERIAL(S)" or "DANGER RADIOACTIVE MATERIAL(S)"