Comparative Analysis in Calibration of Superficial X-ray Therapy Unit Using Various Ionization Chambers (utoledo.edu)
Polarity Effects from Vertically - Mounting Small Volume Ionization Chambers for Reference Dosimetry of Small - Fields (utoledo.edu)
When measured with high energies (e.g., as measured with muon ionization chambers), namely, at energies relevant to the amount of atmospheric ionization, the increase is larger, more than the decreased from the 1940's to 1970's. (sciencebits.com)