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| English | German |
| energy reference source | Normalenergiequelle |
| international reference system | Internationales Referenzsystem (of the International Bureau of Weights and Measures for activity measurement of γ-emitting nuclides) |
| reference axis | Referenzstrahl (of an X-ray tube) |
| reference axis | Bezugsstrahl (of an X-ray tube) |
| reference direction | Referenzrichtung (of an X-ray tube) |
| reference direction | Bezugsrichtung (of an X-ray tube) |
| reference ionization chamber | Normalionisationskammer |
| reference ionization chamber | Referenzionisationskammer |
| reference radiation | Bezugsstrahlung |
| reference radiation | Referenzstrahlung |
| reference scale reading | Bezugsskalenablesung |