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Landsverk Pocket Dosimeters, Models L-49, L-50, L-51, L-53 |
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The following photograph shows, from the top down, the Models L-49, L-50 and L-51 pocket dosimeters manufactured by the Landsverk Electrometer Company of Glendale California. The models L-49 and L-51 date from the 1960s while the Model L-50 dates from the 1950s. |
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The Model L-49 (4" long and 0.5" in diameter) has an anodized
aluminum barrel and responds to both thermal neutrons and gammas in the 0 -
200 mrem range. The claimed accuracy is +/- 10% for gammas and +/- 20% for
neutrons. The Military designation for this model (not indicated) is the
IM-112/PD.
The Model L-50 (4" long and 0.5" in diameter) responds to gamma rays in the 0 - 200 mR range. The Military designation for this model (not indicated) is the IM-9 series/PD. For some odd reason (most likely it was a mistake), Landsverk also used the Model L-50 designation for a ring dosimeter that employed an indirect reading chamber. The Model L-51 (4.5" long and 0.5" in diameter) has an anodized aluminum barrel and responds to gamma rays in the 0 - 5 R range. The Model L-53 (4.5" long and 0.5" in diameter) has an anodized aluminum barrel and responds to gamma rays in the 0 - 20 R range. The L-53 is identical to the Landsverk version of the civil defense dosimeter, the CD V-730. Charging Voltage: 160 volts Energy Dependence: 15% for 80 to 2,000 keV Leakage: 2% in 24 hours References: Landsverk Instrument Catalog, G-14 (enclosed price list dated June 1, 1968.) Advertisement, Nucleonics, May 1958, page 33. The Model L-53 was kindly donated by Amelia Engelmann |
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