T.O. 33B-1-1e.All installations must display suitable Warning signs as given below:(1)The interior of the exposure room shall be posted with sufficient ‘‘Danger, High Radiation Area’’or ‘‘Danger, Very High Radiation Area’’ signs as applicable, so as to be visible from any location.The interior of a cabinet installation must be posted with an identical sign which must be visiblewith the access door open.(2)The entrance to the exposure room and cabinet of cabinet type installations housing X-rayequipment shall be posted with radiation marking signs, either ‘‘Caution, Radiation Area’’,‘‘Warning, High Radiation Area’’ or ‘‘Warning, Very High Radiation Area’’, as applicable. Inaddition, gamma radiography sources and cabinet type installations containing a radioactivesource shall; have a ‘‘Caution, Radioactive materials’’ sign attached to the outside and a label orsign ‘‘Caution, Produces X-rays when energized’’ (or equivalent) shall be affixed to the X-ray tubehead.(3)The area accessible to personnel in which radiation doses could exceed 5 mrem (50 mSv) in anyone hour shall be posted with a ‘‘Caution, Radiation Area’’ sign.f.No person, either within the controlled area or in the environs of the installation, is exposed to morethan the radiation protection standard applicable to members of the public unless exposure isapproved in writing, in advance, by the Radiation Safety Officer.6.9.18.2.3OperatingInstructions.The following are mandatory operating instructions that must be adhered to in ‘‘enclosed installations’’:a.Since the safe operation of an ‘‘enclosed’’ installation is based on the normal operating conditionsspecified in the applicable radiation protection survey report, the equipment shall be operated onlywithin the indicated limits. A copy of the survey report shall be readily available during radiographicexposures.b.When the operating conditions have changed so that there is a probability that the exposure of anyperson may be increased, a radiation protection resurvey or evaluation shall be conducted. In case ofdoubt, a health physicist or nuclear medicine science officer shall be consulted.c.Personnel access to areas where radiography is in progress shall be limited to that which is absolutelyrequired. All entries into the enclosure must be monitored.d.A thorough search for personnel working within the enclosure shall be conducted prior to activatingthe source.e.The tube head or gamma radiography source, as applicable, should be placed as close as possible tothe center of the room. Whenever possible the beam should be directed toward the f loor, and a pieceof 1/8-inch thick lead plate should be placed on the f loor so as to interrupt the entire primary beam inorder to reduce scatter radiation.f.The installation shall be inspected by the radiographers each day the facility is to be used to verify theproper operation of audible alarms, red visible warning signals, interlocks, delay switches, and otherdevices that have a bearing on radiation protection. Interlocks shall be tested by verifying that theydo indeed de-energize the tube head when tripped. Interlocks will be subjected to detailed testing at a6-146Change 3
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business
