Keywords: X-RayStandardization 003.jpg The x-ray towers at NBS which generated x-ray voltages as high as 1 4 1million volts Though no longer the largest in the United States at the time this photo was taken the equipment had voltage stabilization second to none This was a feature necessary for the x-ray research at NBS that led to standard dosage measurements and x-ray protection standards National Institute of Standards and Technology 8/1/1940 National Institute of Standards and Technology PD-USGov-NIST PD-USGov National Bureau of Standards National Institute of Standards and Technology X-rays Standardization Electrostatic particle accelerators |