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Greening, The determination of saturation currents in free-air ionization chambers by extrapolation methods, Phys.
Seltzer, Correction Factors for the NIST Free-Air Ionization Chambers Used to Realize Air Kerma from W-Anode X-Ray Beams, Report NISTIR 7887, National Institute of Standards and Technology, Gaithersburg, MD (2012).
Saito, Effect of the diaphragm of free-air ionization chambers for x-ray air-kerma measurements, Radiat.
Attix, Design of Free-air Ionization Chambers, NBS Handbook 64, National Bureau of Standards, Washington, D.
Attix, Design of free-air ionization chambers, National Bureau of Standards Handbook 64, (1957).
The two NIST primary standards shipped to the NPL for this comparison were the Lamperti (10 kV to 60 kV) and the Ritz (20 kV to 100 kV) free-air ionization chambers.
Ritz, Design of Free-Air Ionization Chambers for the Soft X-Ray Region (20-100 kV), Radiology, 73(6), 911-922 (1959).