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In July of 2001 I visited the Texas Department of Health Radiological
Instrument Calibration shop. Here are some photos from my visit.
Texas Department Of Health Radiological Instrument Shop - 2001
The TDH instrument shop was located in a strip shopping center in Austin Texas. The 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. As of early 2014 I don't know if they still maintain a calibration shop. It's been several years since I communicated with them.
CD V-794 High-Range Calibrator
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."
This unit is capable of exposing the meter that is being calibrated to a 390 Roentgen Per Hour dose of gamma radiation.
CD V-790 Low-Range Calibrator
This is the CD V-790 calibrator that is used to calibrate the CD V-700. The calibration unit consists of a lead containter mounted into a table. There is a small radioactive source inside the lead container. The probe of the CDV-700 goes into the v-shaped clip (see other photo below) in the frame above the container directly below the Danger Radiation Area sign. 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. The technician calibrated my 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.
Iowa State Radiological Maintenance Shop - 2002
In 2002 I received an email from Brian Lewis with Iowa Emergency Management. He sent several pictures to me of their shop and some with the instruments actually in the calibration units. Thanks Brian! It only took me 12 years to get these pics up on the site. As of early 2014 I don't know if Iowa still operates an instrument shop.
CD V-790 Calibrator With CD V-700
Here is the CD V-790 with the probe positioned in the calibrator. The probe is in the V-shaped block at the top of the unit. Click photo to see larger.
CD V-794 Calibrator With CD V-715