1. Generalities.- 2. Dosimetry.- 3. Generation and attenuation of X- and gamma rays.- 4. Relative depth doses, tissue/air ratios and dose distributions for various radiations.- 5. Scattering of X- and gamma rays and its influence on dose distribution.- 6. Nuclear medicine and radium therapy.- 7. Diagnostic with X-rays.- 8. General data on medicine and biology.- 9. Radiation protection.- 10. Index.