Texas Dept. of Health RADEF Shop Radiation Kits Main Radiation Kits CD V-777 Kit CD V-777A Kit CD V-777-1 Kit CD V-777-2 Kit CD V-777-4 Kit CD V-755 High School Kit Other Sets CD V-781 Aerial Monitoring Set CD V-757 Barrier Demonstration Set CD V-457 Class Demo Set Radiation Instruments CD V-700 CD V-700 Specials CD V-710 CD V-711 CD V-715 CD V-717 CD V-720 CD V-750 and Dosimeters Back to Shelter Supplies Main Back to Civil Defense Museum Main		In July of 2001 I visited the Texas Department of Health RADEF shop. The Texas Department of Health Radiological Emergency Preparedness Program still maintains a small inventory of Civil Defense radiation instruments for emergency use. Here are some photos from my trip. The TDH-RADEF shop was located in a strip shopping center in Austin Texas. This shop consisted of an office for the small staff and warehouse space to store the instruments. Here you can see shelves of CDV-700s and CDV-715s ready for calibration. The CDV-794 high-range calibration unit at the left in the picture. The shop changed location shortly after this visit. Here is the CD V-794 high-range calibration unit. This unit has a 130 curie Cesium-137 source inside of it and is heavily shielded. They use a pallet jack to move it around. This thing must weigh a ton! This is used for calibration of the high-range survey meters. The meter goes into the opening at the right of the unit. The door slides closed over the opening to shield the operator. Like a dope, I didn't even think about taking a picture of the unit with the door closed so the controls aren't visible in this picture. Without thinking first, I asked one of the shop technicians if he had ever seen the source out of this unit. He replied "the only way I would ever want to see that source is through a pair of binoculars from far away." I said "Oh yeah, I guess it is pretty hot isn't it." Duhhh. This unit is capable of exposing the meter that is being calibrated to a 390 Roentgen Per Hour dose of gamma radiation. OUCH!!!! Click image to see larger. This is the calibrator that is used to calibrate the CD V-700. It has a CD V number but I can't remember what it is now. The calibration unit consists of a lead containter mounted into a small roll around table. There is a small radioactive source inside the lead container. The probe of the CDV-700 goes into the v-shaped clip in the frame above the container directly below the Danger Radiation Area sign. Click photo to see larger. There are 3 sliding attenuators that move into the path of the radiation coming out of the top of the lead container. The rods sticking out of the metal frame at the left are what move the attenuators. The various ranges of the meter are calibrated by moving each attenuator out of the way as needed to check each range of the meter. I watched the technician calibrate a 700 while I was there. He first checked the geiger tube voltage after the meter warmed up for a few minutes. He then set the geiger tube voltage and calibrated the meter. He set the calibration adjustment and then checked the meter in all of it's ranges. The whole process only took a few minutes.