The PTB free-air ionization chambers

Ludwig Büermann
The fundamental quantity in the dosimetry of ionizing radiation is the absorbed dose to matter in units of J/kg with the special name of gray (Gy). The Physikalisch-Technische Bundesanstalt (PTB), the national metrology institute of Germany, is responsible for the realization and dissemination of the gray for x- and gamma radiation. The quantity air kerma is the metrological basis for dosimetry in radiation protection applications as well as in medical x-ray diagnostics and therapy. Air...
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