CD V-457 Count Rate Meter for Training (ca. 1960)
The above photos show the first version of the Model 457 (produced by Jordan Electronics Inc.).
Quoting the Radiological Defense Manual:
|These photos show the three versions of the CD V-457 that were manufactured by Nucleonic Corporation of America (Brooklyn, New York). From left to right (in both photos): the Model 2, the Model 3 and the Model 3A. Look pretty much the same don't they? The black knob to the left is the voltage adjustment, the knob to the right is the volume adjustment for the loudspeaker, and the lower middle black knob is the four position range switch (off, high voltage check, X 10 and X 1). The light immediately below the center of the meter face flashes as a visual indicator of the count rate.|
The CD V-457 was distributed together with a number of other CD V
instruments and accessories for training and demonstration purposes. Everything was
housed in a yellow storage/shipping case. A complete demonstration kit
consisted of the following:
|This CD V set was based on the Model 1613A training set produced in the early 1950s by Nuclear Instrument & Chemical Corp., of Chicago Illinois. The latter also came with a calibrated mounting board, two radium sources, 15 flat aluminum absorbers, 10 flat lead absorbers, 20 flat cardboard absorbers, one cylindrical aluminum absorber, one cylindrical lead absorber and one cylindrical cardboard absorber. In place of the Model 457 monitor, which hadn't yet been produced, the Nuclear Instrument & Chemical Corp set came with the "Classmaster" monitor.|
The above photo, showing the training set in use, is from the National Archives. The text accompanying the photo reads:
The photo shows the GM probe of a Jordan CD V-457 mounted at one end of the "calibrated mounting board" with a set of absorbers between the probe and the source. A CD V-700 Model 3 GM detector and a pair of pocket dosimeters are also on the table.
According to a presentation given by Jack Greene, 200 of the CD V-457s were procured in 1956. Data in the 1962 Annual Report of the Office of Civil Defense indicate that 300 were ordered through FY 1958 (prior to FY 1959), 1,276 were ordered in 1959, 971 in 1960 and 1,029 in 1961. The 1986 Defense Civil Preparedness Agency publication Radiological Instruments: An Essential Resource for National Preparedness (CPG 3-1) estimated that that 1,058 had been disposed of or excessed which meant that 2,518 CD V-457 units remained in state and Federal inventories.
Lionel Electronic Laboratories made a commercial version of this instrument, the Type 457, which they said would "fit the most modest school or university budget." It sold for $175 in 1961.
Detector: halogen quenched thin-walled (30 mg/cm2) Geiger tube Anton/Lionel 114/6993 operated at 900 volts
Range: 0 – 1500 cpm, 0 - 15,000 cpm
Voltage: 500 - 1200 volts
Meter: the meter reading, from 0 to 1500, is either cpm or volts depending on the range switch setting
Size: 9.5" high x 7" wide x 8.5" high
Power: 110 volt AC current
Estimated Dates of First Production:
Model 1. ca. 1956 (identified as the Model Jordan 457, not identified as a model 1)
Model 2 ca. 1959
Model 3 ca. 1960
Model 3A ca. 1961
|Approximate Cumulative Procurement, Inventory and Distribution of CD V-457s*|
* The numbers in
the above table should be considered approximate. I compiled them from
data in the Annual Statistical Reports of the OCDM, OCD and DCPA. By
"procured," I mean delivered by the manufacturer to the OCDM,
OCD or DCPA. "Inventoried" means stored in a Federal (rather
than state) warehouse ready for distribution. "Distributed"
means sent to the end user. The latter primarily means the states, but
also various federal agencies and even foreign governments. The number of
procured instruments may be greater than the combined number of
inventoried and distributed instruments for a variety of reasons: some may
have been sent back to the manufacturer, some may have been disposed of,
the numbers might be incorrect, etc.
The Jordan Model 457 was kindly donated by the Northern Ohio Chapter of the Health Physics Society courtesy of John Wills. Also, many thanks to Don Lanzrath for providing me with the CD V-787 ten day water standards, the lead cylindrical shield and a number of the CD V-138 dosimeters.
Atomic Energy Commission Radiation Instrument Catalog No. 3. RIB-8. 1952.
Lionel Electronic Laboratories advertisement in Nucleonics. July 1961. Page 118.
Nucleonic Corporation of America. Instruction, Maintenance and Experiment Manual. Radiological Demonstration Unit. OCDM Item No. CD V-457 Model No. 2. No date. The manual can be downloaded from the Museum Library.
Defense Civil Preparedness Agency. Radiological Defense Manual. CPG 2-6.2. June 1977.
Copyright 1999, Oak Ridge Associated Universities