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The top scale was calibrated to read from 0 to 120 R/hr for a one minute exposure and the bottom scale was calibrated to read from 0 to 12 R/hr for a 10 minute exposure.
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The CD V-736 was somewhat unique among dosimeters in that it read out in R/hr, but it was actually a standard dosimeter calibrated for one and ten minute exposure times. The box seems to have been produced in two versions: blue and red. These instruments, according to the Instruction and Maintenance Manual, “can provide you with vital information about fallout radiation in the event of a nuclear attack.” In addition to two instruction booklets and a 1.5 volt battery, the kit contained two direct reading pocket dosimeters (the tan colored CD V-736 and the blue colored CD V-746) and one dosimeter charger-reader (the CD V-756). The kit was both approved and recommended by the Office of Civil Defense (OCD). The suggested retail price for the kit was $24.95-a very reasonable price for these “3 Life Savers.” These were often provided "free" of charge when you purchased a commercially available fallout shelter. The public had been encouraged to construct home fallout shelters but until Bendix started producing the kit, there was no commercially available radiation detection instrumentation that was both inexpensive and easy to use.
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Without a doubt, it filled an important need. By then the fallout shelter boom had gone bust. The last reference I've found dates from 1963. The earliest reference I have found for it was in a newspaper article from August 1961. The Family Radiation Measurement Kit was produced by the Bendix Corporation of Cincinnati Ohio.
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