Victoreen CDV-715 Geiger Meter
The CD V-715 is “a high-range gamma survey meter for general post attack operational use” that employs a hermetically sealed ionization chamber. All the models (1, 1A, 1B) of the 715 were transistorized, and like other CDV ion chamber survey meters (e.g., the CD V-710), the CD V-715 had two controls: a zero adjust knob and a range switch.
While the CD V-710 and the CD V-720 had three ranges, the CD V-715 had four. This allowed the CD V-715 to span the range of both. According to the Handbook for Radiological Monitors (1963), the CD-715 superseded both the CD V-710 and the CD V-720. When the CD V-715 was first produced (in 1961 or 1962), the government disposed of its entire inventory of CD V-710s and roughly 40% of its CD V-720s.
What makes this Victoreen unit especially unique is the fact the detector is capable of responding to beta radiation just like the CD V-720! The standard CD V-715 (see below) had no such beta detection capability. It is possible this is a prototype and that Victoreen's original intent was that their version of the CD V-715 employ the same chamber as the CD V-720. For whatever reason, a Victoreen Model 1 never went into large scale production. The fact that this instrument refers to the "OCDM" indicates that it was produced earlier than the Victoreen CD V-715 Models 1A and 1B because those instruments refer to the "OCD" item number. The OCDM became the OCD in 1961.
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