2020DIN 6809-4:2020-04 Clinical dosimetry - Part 4: X-ray therapy with X-ray tube voltages between 10 kV and 300 kV
1970DIN 6809-4 E:2016-06 Clinical dosimetry; applications of X-rays with peak voltages between 10 and 100 kV in radiotheraphy and soft tissue diagnostics
1988DIN 6809-4:1988 Clinical dosimetry; applications of X-rays with peak voltages between 10 and 100 kV in radiotheraphy and soft tissue diagnostics