CD V-457
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CD V-457 Radiological Demonstrator Unit

"Sister Mary Helene ven Horst, science instructor at Marycrest College in Davenport, Iowa, teaches students the theory of radiation and the use of radiological monitoring instruments. A 10-hour course in radiological meter reading is taught to students at the college, and a 32-hour course in radiation physics and monitoring is taught at the adult level. Marycrest College is operated by the Sisters of the Humility of Mary." This picture is from a US government archives web site. I can't remember which one. It shows a early version of a CD V-457 set in use. Note the case on the table behind the women, the old Jordan 457 (see photo below) counter on the table and the calibrated mounting board on the table in front of the Jordan 457 counter. The CD V-700s are all early Model 3s.

457 Manual Picture

The CD V-457 demonstrator set-up consists of the calibrated mounting board, absorbers, radioactive source (C-cell battery shows where the source goes in the photo) and the GM probe from the CD V-457 counter attached to the bracket at the end of the board. Aluminum square absorbers are shown in the photo. The set I have is missing the lead and cardboard square absorbers and all of the cylindrical absorbers. The cylindrical absorbers were for placing around the GM tube. The demonstration would have the different types of absorbers placed in between the GM tube and radioactive source to show how the different materials blocked or didn't block the radiation from the source.

This is as close as I can get to duplicating a demonstration with the CD V-457. I used my trusty turn and bank aircraft instrument with the radium painted face in place of the original source. The left photo shows a 300cpm reading with no absorbers in place and the right photo shows a slightly lower 260cpm reading with 14 aluminum absorbers in place. The aluminum absorbers don't do much to block the gamma coming off of the face of the indicator.

Here's a photo of a Jordan Model 457 and a later Nucleonic Corp. of America CD V-457 Model 2. The Jordan unit doesn't have a "CD V" number on it. This Jordan unit appears to be the same type of 457 in the photo at the top of this page. I wondered for the longest time what model of 457 was in the photo at the top of this page until I found this one. It's obvious that the counter in the photo is different than the light blue case CD V-457s. The Jordan 457 appears to be the same unit in the photo.

CD V-457 Training Geiger Counters
Here are a couple of CD V-457s. The one on the left is a Model 3A and the one on the right is a Model 2. The Model 2, 3 and 3A are all identical on the front. This counter is a table-top model that operates from a 115 volt wall plug. It uses the same probe and Geiger-Muller (G-M) detector tube that the CD V-700 uses.

457 Demo Set Case Open Top

Here is the CD V-457 case showing the open top tray that holds the manuals and dosimeters. The red tube on the bottom of the lid has an extra G-M tube for the counter. Right above the spare tube bracket in the lid is a holder for 2 radioactive radium beta-gamma sources. The radioactive sources weren't with this set.

457 Demo Case Open Bottom
Here is the case with the top tray latched into the lid. The CD V-457 counter stores in the space to the left. Just in front of it is storage for the CD V-787 Food and Water Standards. Storage brackets for film reels are in the center. The dosimeter chargers on the right are sitting on top of a removable tray that holds the calibrated mounting board. Below that tray is storage for the square sheild and tube demonstration absorbers.