641—40.55 (136C) Security and control of licensed or registered sources of radiation.
	  1. 	 The licensee or registrant shall secure licensed or registered radioactive material that is stored in controlled or unrestricted areas from unauthorized removal or access.
	  2. 	 The licensee or registrant shall maintain constant surveillance and use devices or administrative procedures to prevent unauthorized use of licensed or registered radioactive material that is in an unrestricted area and that is not in storage.
	  3. 	 The registrant shall secure registered radiation machines from unauthorized removal.
	  4. 	 The registrant shall use devices or administrative procedures to prevent unauthorized use of registered radiation machines.
	  5. 	 Security requirements for portable gauges. Each portable gauge licensee shall use a minimum of two independent physical controls that form tangible barriers to secure portable gauges from unauthorized removal, whenever portable gauges are not under the control and constant surveillance of the licensee.