NEVER   remove   a   radioactive   tube   from   its shipping container until you are ready to install it.    NEVER touch any radioactive fragments. If you do,   wash   yourself   thoroughly   with   soap   and water and get medical attention. Cathode-Ray Tubes Cathode-ray   tubes   (CRTs)   are   everywhere:   in televisions, desktop computers, radars, and electronic warfare   systems.   As   a   Fire   Controlman,   you   will probably maintain electronic systems that use CRTs. Therefore,   you   must   know   about   their   hazards, handling, and disposition. CRT   HAZARDS.   Working   with   CRTs   can   be extremely hazardous. A CRT consists of a large glass envelope that maintains a high internal vacuum. It also has  a  toxic  phosphor  coating  on  its  face.  CRTs  are under  great  pressure;  for  example,  a  10-inch  CRT  is subject to nearly 2,000 pounds of force. Of that, 1,000 pounds  is  impressed  on  the  face  of  the  tube  alone. Therefore,  breaking  the  glass  envelope  will  cause  a violent implosion. During the implosion, all the glass fragments,  metal  parts,  and  toxic  phosphor  will  be expelled violently. Because a CRT carries a very high voltage and emits x-rays, it can also be hazardous when it’s energized. CRT   HANDLING.   To   protect   yourself   from serious  injury  when  you  handle  CRTs,  follow  these precautions:    F o l l ow    t h e    m a n u f a c t u r e r ’s    h a n d l i n g instructions.    Keep a new CRT in its shipping carton until you are ready to use it.    Place  a  defective  CRT  in  its  shipping carton immediately after you remove it from the equipment.    Wear gloves and goggles.    NEVER remove a CRT until you have discharged its high-voltage anode.    NEVER strike or scratch the surface of a CRT’s glass envelope.    NEVER stand in front of a CRT when you   install   it.   If   the   CRT   should implode,  the  electron  gun  in  its  neck could   be   propelled   at   a   very   high velocity through the face of the tube and into your body.    NEVER carry a CRT by its neck.    NEVER   touch   a   CRT’s   phosphor coating;   it   is   extremely   toxic.   If   you break   a   CRT,   clean   up   the   glass fragments  very  carefully.  If  you  touch the   phosphor,   seek   medical   attention immediately. CRT DISPOSAL. CRTs are disposed of either by shipping   them   back   to   the   manufacturer   or   by discarding them locally. If you ship a CRT back to the manufacturer, put it in the shipping container intact. If you  dispose  of  a  CRT  locally,  follow  the  procedure prescribed by your safety officer. Q3. What  are  PCBs  normally  used  for  on  board  a ship? Q4. What   are   two   hazards   associated   with   an energized CRT? GENERAL STOWAGE REQUIREMENTS OF HAZARDOUS MATERIALS Proper stowage of hazardous materials is essential to  ship  and  personnel  safety.  Supply  department  and individual  work-center  personnel  are  responsible  for the  proper  stowage  of  hazardous  materials  in  areas under   their   control.   For   answers   to   your   questions concerning hazardous material stowage, consult your supervisor,   supply   officer,   or   hazardous   material/ hazardous waste coordinator. Hazardous   materials   aboard   ship   are   typically packaged   in   cases   or   allotments   of   individual containers.   Do   not   store   hazardous   materials   in heat-producing   areas   or   near   heat-producing   items. Shield hazardous materials stored on a weather deck or in exposed areas from direct sunlight. Temporary   storage   of   hazardous   material   in workspaces is limited to the amount necessary for the operation and maintenance of assigned equipment. If a HAZMINCEN is in operation, no more than a 7-day supply of common-use HM may be kept in workcenter spaces. Study the Naval Ships’ Technical Manual, Chapter 670, Stowage,  Handling, and Disposal of General Use Consumables,    NAVSEA   S9086-WK-STM-010,   and become   familiar   with   its   contents.   You   can   find additional   information   in   the    NAVOSH   Program 4-8