TY JOUR TI The Ratio between Absorbed Dose, Kerma and Ionization Kerma for Small-size Fields KW clinical dosimetry KW dose KW kerma KW ionization kerma KW small fields JO Medical Radiology and radiation safety AU Klimanov, V.A. AU Galyautdinova, Z.Z. AU Kolyvanova, M.A. PY 2019 IS 64 PB Federal Medical Biological Agency of Russia